SQLITE_NOTICE(283): recovered 1 frames from WAL file /fossil/sqlite.fossil-wal

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Overview
Comment:Rearrange some ENABLE_LOCKING_STYLE related code in os_unix.c. (CVS 5324)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: f70d552bcd0df884eea2e2272bae558d35fc8845
User & Date: danielk1977 2008-06-28 11:23:00
Context
2008-06-28
11:29
Added reminder message to terminate SQL statements with a semicolon on shell startup. This closes #3099. (CVS 5325) check-in: 0ab0b030 user: mihailim tags: trunk
11:23
Rearrange some ENABLE_LOCKING_STYLE related code in os_unix.c. (CVS 5324) check-in: f70d552b user: danielk1977 tags: trunk
2008-06-27
18:59
Changed copy-paste error in comment. Fixes #3193. (CVS 5323) check-in: 00eee53e user: mihailim tags: trunk
Changes
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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code that is specific to Unix systems.
**
** $Id: os_unix.c,v 1.190 2008/06/26 10:41:19 danielk1977 Exp $
*/
#include "sqliteInt.h"
#if SQLITE_OS_UNIX              /* This file is used on unix only */











/* #define SQLITE_ENABLE_LOCKING_STYLE 0 */

/*
** These #defines should enable >2GB file support on Posix if the
** underlying operating system supports it.  If the OS lacks
** large file support, these should be no-ops.
**
................................................................................
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>

#ifdef SQLITE_ENABLE_LOCKING_STYLE
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/mount.h>
#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
................................................................................
  */
  char aPadding[32];
#endif
  struct openCnt *pOpen;    /* Info about all open fd's on this inode */
  struct lockInfo *pLock;   /* Info about locks on this inode */
#ifdef SQLITE_ENABLE_LOCKING_STYLE
  void *lockingContext;     /* Locking style specific state */
#endif /* SQLITE_ENABLE_LOCKING_STYLE */
  int h;                    /* The file descriptor */
  unsigned char locktype;   /* The type of lock held on this fd */
  int dirfd;                /* File descriptor for the directory */
#if SQLITE_THREADSAFE
  pthread_t tid;            /* The thread that "owns" this unixFile */
#endif
};
................................................................................
/*
** Here is the dirt on POSIX advisory locks:  ANSI STD 1003.1 (1996)
** section 6.5.2.2 lines 483 through 490 specify that when a process
** sets or clears a lock, that operation overrides any prior locks set
** by the same process.  It does not explicitly say so, but this implies
** that it overrides locks set by the same process using a different
** file descriptor.  Consider this test case:
**
**       int fd1 = open("./file1", O_RDWR|O_CREAT, 0644);
**       int fd2 = open("./file2", O_RDWR|O_CREAT, 0644);
**
** Suppose ./file1 and ./file2 are really the same file (because
** one is a hard or symbolic link to the other) then if you set
** an exclusive lock on fd1, then try to get an exclusive lock
** on fd2, it works.  I would have expected the second lock to
** fail since there was already a lock on the file due to fd1.
................................................................................
** These hash tables map inodes and file descriptors (really, lockKey and
** openKey structures) into lockInfo and openCnt structures.  Access to 
** these hash tables must be protected by a mutex.
*/
static Hash lockHash = {SQLITE_HASH_BINARY, 0, 0, 0, 0, 0};
static Hash openHash = {SQLITE_HASH_BINARY, 0, 0, 0, 0, 0};

#ifdef SQLITE_ENABLE_LOCKING_STYLE
/*
** The locking styles are associated with the different file locking
** capabilities supported by different file systems.  
**
** POSIX locking style fully supports shared and exclusive byte-range locks 
** ADP locking only supports exclusive byte-range locks
** FLOCK only supports a single file-global exclusive lock
** DOTLOCK isn't a true locking style, it refers to the use of a special
**   file named the same as the database file with a '.lock' extension, this
**   can be used on file systems that do not offer any reliable file locking
** NO locking means that no locking will be attempted, this is only used for
**   read-only file systems currently
** UNSUPPORTED means that no locking will be attempted, this is only used for
**   file systems that are known to be unsupported
*/
typedef enum {
  posixLockingStyle = 0,       /* standard posix-advisory locks */
  afpLockingStyle,             /* use afp locks */
  flockLockingStyle,           /* use flock() */
  dotlockLockingStyle,         /* use <file>.lock files */
  noLockingStyle,              /* useful for read-only file system */
  unsupportedLockingStyle      /* indicates unsupported file system */
} sqlite3LockingStyle;
#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
** Helper functions to obtain and relinquish the global mutex.
*/
static void enterMutex(){
  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
................................................................................
}
#endif /* SQLITE_THREADSAFE */

/*
** Release a lockInfo structure previously allocated by findLockInfo().
*/
static void releaseLockInfo(struct lockInfo *pLock){
  if (pLock == NULL)
    return;
  pLock->nRef--;
  if( pLock->nRef==0 ){
    sqlite3HashInsert(&lockHash, &pLock->key, sizeof(pLock->key), 0);
    sqlite3_free(pLock);

  }
}

/*
** Release a openCnt structure previously allocated by findLockInfo().
*/
static void releaseOpenCnt(struct openCnt *pOpen){
  if (pOpen == NULL)
    return;
  pOpen->nRef--;
  if( pOpen->nRef==0 ){
    sqlite3HashInsert(&openHash, &pOpen->key, sizeof(pOpen->key), 0);
    free(pOpen->aPending);
    sqlite3_free(pOpen);

  }
}

#ifdef SQLITE_ENABLE_LOCKING_STYLE
/*
** Tests a byte-range locking query to see if byte range locks are 
** supported, if not we fall back to dotlockLockingStyle.
*/
static sqlite3LockingStyle sqlite3TestLockingStyle(
  const char *filePath, 
  int fd
){
  /* test byte-range lock using fcntl */
  struct flock lockInfo;
  
  lockInfo.l_len = 1;
  lockInfo.l_start = 0;
  lockInfo.l_whence = SEEK_SET;
  lockInfo.l_type = F_RDLCK;
  
  if( fcntl(fd, F_GETLK, &lockInfo)!=-1 ) {
    return posixLockingStyle;

  } 
  
  /* testing for flock can give false positives.  So if if the above test
  ** fails, then we fall back to using dot-lock style locking.
  */  
  return dotlockLockingStyle;

}

/* 

** Examines the f_fstypename entry in the statfs structure as returned by 
** stat() for the file system hosting the database file, assigns the 
** appropriate locking style based on its value.  These values and 
** assignments are based on Darwin/OSX behavior and have not been tested on 
** other systems.



*/
static sqlite3LockingStyle sqlite3DetectLockingStyle(

  const char *filePath, 
  int fd
){

#ifdef SQLITE_FIXED_LOCKING_STYLE

  return (sqlite3LockingStyle)SQLITE_FIXED_LOCKING_STYLE;
#else










  struct statfs fsInfo;

  if( statfs(filePath, &fsInfo) == -1 ){
    return sqlite3TestLockingStyle(filePath, fd);


  }
  if( fsInfo.f_flags & MNT_RDONLY ){
    return noLockingStyle;


  }
  if( strcmp(fsInfo.f_fstypename, "hfs")==0 ||
      strcmp(fsInfo.f_fstypename, "ufs")==0 ){
    return posixLockingStyle;
  }
  if( strcmp(fsInfo.f_fstypename, "afpfs")==0 ){
    return afpLockingStyle;



  }

  if( strcmp(fsInfo.f_fstypename, "nfs")==0 ){
    return sqlite3TestLockingStyle(filePath, fd);

  }
  if( strcmp(fsInfo.f_fstypename, "smbfs")==0 ){
    return flockLockingStyle;
  }
  if( strcmp(fsInfo.f_fstypename, "msdos")==0 ){
    return dotlockLockingStyle;
  }
  if( strcmp(fsInfo.f_fstypename, "webdav")==0 ){
    return unsupportedLockingStyle;
  }

  return sqlite3TestLockingStyle(filePath, fd);  

#endif /* SQLITE_FIXED_LOCKING_STYLE */
}

#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
** Given a file descriptor, locate lockInfo and openCnt structures that
** describes that file descriptor.  Create new ones if necessary.  The
** return values might be uninitialized if an error occurs.
**
** Return an appropriate error code.
................................................................................
      }
    }
  }
  leaveMutex();
  if( rc==SQLITE_OK ) pFile->locktype = locktype;
  return rc;
}

/*






















** Close a file.
*/
static int unixClose(sqlite3_file *id){

  unixFile *pFile = (unixFile *)id;
  if( !pFile ) return SQLITE_OK;
  unixUnlock(id, NO_LOCK);
  if( pFile->dirfd>=0 ) close(pFile->dirfd);
  pFile->dirfd = -1;
  enterMutex();

  if( pFile->pOpen->nLock ){
    /* If there are outstanding locks, do not actually close the file just
    ** yet because that would clear those locks.  Instead, add the file
    ** descriptor to pOpen->aPending.  It will be automatically closed when
    ** the last lock is cleared.
    */
    int *aNew;
    struct openCnt *pOpen = pFile->pOpen;
    aNew = realloc( pOpen->aPending, (pOpen->nPending+1)*sizeof(int) );
    if( aNew==0 ){
      /* If a malloc fails, just leak the file descriptor */
    }else{
      pOpen->aPending = aNew;
      pOpen->aPending[pOpen->nPending] = pFile->h;
      pOpen->nPending++;

    }
  }else{
    /* There are no outstanding locks so we can close the file immediately */
    close(pFile->h);
  }
  releaseLockInfo(pFile->pLock);
  releaseOpenCnt(pFile->pOpen);


  leaveMutex();
  OSTRACE2("CLOSE   %-3d\n", pFile->h);
  OpenCounter(-1);
  memset(pFile, 0, sizeof(unixFile));

  return SQLITE_OK;
}


#ifdef SQLITE_ENABLE_LOCKING_STYLE
#pragma mark AFP Support

................................................................................

/*
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, return
 ** non-zero.  If the file is unlocked or holds only SHARED locks, then
 ** return zero.
 */
static int afpUnixCheckReservedLock(sqlite3_file *id, int *pResOut){
  int r = 0;
  unixFile *pFile = (unixFile*)id;
  
  assert( pFile ); 
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
  
  /* Check if a thread in this process holds such a lock */
................................................................................
  
  *pResOut = r;
  return SQLITE_OK;
}

/* AFP-style locking following the behavior of unixLock, see the unixLock 
** function comments for details of lock management. */
static int afpUnixLock(sqlite3_file *id, int locktype){
  int rc = SQLITE_OK;
  unixFile *pFile = (unixFile*)id;
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
  int gotPendingLock = 0;
  
  assert( pFile );
  OSTRACE5("LOCK    %d %s was %s pid=%d\n", pFile->h,
         locktypeName(locktype), locktypeName(pFile->locktype), getpid());

  /* If there is already a lock of this type or more restrictive on the
  ** unixFile, do nothing. Don't use the afp_end_lock: exit path, as
................................................................................
  }
  
  /* If control gets to this point, then actually go ahead and make
  ** operating system calls for the specified lock.
  */
  if( locktype==SHARED_LOCK ){
    int lk, failed;
    int tries = 0;
    
    /* Now get the read-lock */
    /* note that the quality of the randomness doesn't matter that much */
    lk = random(); 
    context->sharedLockByte = (lk & 0x7fffffff)%(SHARED_SIZE - 1);
    failed = _AFPFSSetLock(context->filePath, pFile->h, 
      SHARED_FIRST+context->sharedLockByte, 1, 1);
................................................................................
        /* Acquire a RESERVED lock */
        failed = _AFPFSSetLock(context->filePath, pFile->h, RESERVED_BYTE, 1,1);
    }
    if (!failed && locktype == EXCLUSIVE_LOCK) {
      /* Acquire an EXCLUSIVE lock */
        
      /* Remove the shared lock before trying the range.  we'll need to 
      ** reestablish the shared lock if we can't get the  afpUnixUnlock
      */
      if (!_AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST +
                         context->sharedLockByte, 1, 0)) {
        /* now attemmpt to get the exclusive lock range */
        failed = _AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST, 
                               SHARED_SIZE, 1);
        if (failed && _AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST +
................................................................................
/*
** Lower the locking level on file descriptor pFile to locktype.  locktype
** must be either NO_LOCK or SHARED_LOCK.
**
** If the locking level of the file descriptor is already at or below
** the requested locking level, this routine is a no-op.
*/
static int afpUnixUnlock(sqlite3_file *id, int locktype) {
  struct flock lock;
  int rc = SQLITE_OK;
  unixFile *pFile = (unixFile*)id;
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;

  assert( pFile );
  OSTRACE5("UNLOCK  %d %d was %d pid=%d\n", pFile->h, locktype,
         pFile->locktype, getpid());
................................................................................
  leaveMutex();
  return rc;
}

/*
** Close a file & cleanup AFP specific locking context 
*/
static int afpUnixClose(sqlite3_file *id) {

  unixFile *pFile = (unixFile*)id;

  if( !pFile ) return SQLITE_OK;
  afpUnixUnlock(id, NO_LOCK);
  sqlite3_free(pFile->lockingContext);

  if( pFile->dirfd>=0 ) close(pFile->dirfd);
  pFile->dirfd = -1;
  enterMutex();
  close(pFile->h);
  leaveMutex();
  OSTRACE2("CLOSE   %-3d\n", pFile->h);
  OpenCounter(-1);
  memset(pFile, 0, sizeof(unixFile));
  return SQLITE_OK;
}


#pragma mark flock() style locking

/*
** The flockLockingContext is not used
*/
typedef void flockLockingContext;

static int flockUnixCheckReservedLock(sqlite3_file *id, int *pResOut){
  int r = 1;
  unixFile *pFile = (unixFile*)id;
  
  if (pFile->locktype != RESERVED_LOCK) {
    /* attempt to get the lock */
    int rc = flock(pFile->h, LOCK_EX | LOCK_NB);
    if (!rc) {
................................................................................
    }
  }

  *pResOut = r;
  return SQLITE_OK;
}

static int flockUnixLock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  
  /* if we already have a lock, it is exclusive.  
  ** Just adjust level and punt on outta here. */
  if (pFile->locktype > NO_LOCK) {
    pFile->locktype = locktype;
    return SQLITE_OK;
................................................................................
  } else {
    /* got it, set the type and return ok */
    pFile->locktype = locktype;
    return SQLITE_OK;
  }
}

static int flockUnixUnlock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  
  assert( locktype<=SHARED_LOCK );
  
  /* no-op if possible */
  if( pFile->locktype==locktype ){
    return SQLITE_OK;
................................................................................
    return SQLITE_OK;
  }
}

/*
** Close a file.
*/
static int flockUnixClose(sqlite3_file *id) {
  unixFile *pFile = (unixFile*)id;
  
  if( !pFile ) return SQLITE_OK;
  flockUnixUnlock(id, NO_LOCK);
  
  if( pFile->dirfd>=0 ) close(pFile->dirfd);
  pFile->dirfd = -1;


  enterMutex();
  close(pFile->h);  
  leaveMutex();
  OSTRACE2("CLOSE   %-3d\n", pFile->h);
  OpenCounter(-1);
  memset(pFile, 0, sizeof(unixFile));
  return SQLITE_OK;
}

#pragma mark Old-School .lock file based locking

/*
** The dotlockLockingContext structure contains all dotlock (.lock) lock
** specific state
*/
typedef struct dotlockLockingContext dotlockLockingContext;
struct dotlockLockingContext {
  char *lockPath;
};


static int dotlockUnixCheckReservedLock(sqlite3_file *id, int *pResOut) {
  int r = 1;
  unixFile *pFile = (unixFile*)id;
  dotlockLockingContext *context;


  context = (dotlockLockingContext*)pFile->lockingContext;
  if (pFile->locktype != RESERVED_LOCK) {
    struct stat statBuf;
    if (lstat(context->lockPath,&statBuf) != 0){
      /* file does not exist, we could have it if we want it */
      r = 0;
    }
  }

  *pResOut = r;
  return SQLITE_OK;
}

static int dotlockUnixLock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  dotlockLockingContext *context;
  int fd;

  context = (dotlockLockingContext*)pFile->lockingContext;
  
  /* if we already have a lock, it is exclusive.  
  ** Just adjust level and punt on outta here. */
  if (pFile->locktype > NO_LOCK) {
    pFile->locktype = locktype;
    
    /* Always update the timestamp on the old file */
    utimes(context->lockPath,NULL);
    return SQLITE_OK;
  }
  
  /* check to see if lock file already exists */
  struct stat statBuf;
  if (lstat(context->lockPath,&statBuf) == 0){
    return SQLITE_BUSY; /* it does, busy */
  }
  
  /* grab an exclusive lock */
  fd = open(context->lockPath,O_RDONLY|O_CREAT|O_EXCL,0600);
  if( fd<0 ){
    /* failed to open/create the file, someone else may have stolen the lock */
    return SQLITE_BUSY; 
  }
  close(fd);
  
  /* got it, set the type and return ok */
  pFile->locktype = locktype;
  return SQLITE_OK;
}

static int dotlockUnixUnlock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  dotlockLockingContext *context;

  context = (dotlockLockingContext*)pFile->lockingContext;
  
  assert( locktype<=SHARED_LOCK );
  
  /* no-op if possible */
  if( pFile->locktype==locktype ){
    return SQLITE_OK;
  }
  
................................................................................
  /* shared can just be set because we always have an exclusive */
  if (locktype==SHARED_LOCK) {
    pFile->locktype = locktype;
    return SQLITE_OK;
  }
  
  /* no, really, unlock. */
  unlink(context->lockPath);
  pFile->locktype = NO_LOCK;
  return SQLITE_OK;
}

/*
 ** Close a file.
 */
static int dotlockUnixClose(sqlite3_file *id) {

  unixFile *pFile = (unixFile*)id;
  
  if( !pFile ) return SQLITE_OK;
  dotlockUnixUnlock(id, NO_LOCK);
  sqlite3_free(pFile->lockingContext);

  if( pFile->dirfd>=0 ) close(pFile->dirfd);
  pFile->dirfd = -1;
  enterMutex();  
  close(pFile->h);
  leaveMutex();
  OSTRACE2("CLOSE   %-3d\n", pFile->h);
  OpenCounter(-1);
  memset(pFile, 0, sizeof(unixFile));
  return SQLITE_OK;
}


#pragma mark No locking

/*
** The nolockLockingContext is void
*/
typedef void nolockLockingContext;

static int nolockUnixCheckReservedLock(sqlite3_file *id, int *pResOut) {
  *pResOut = 0;
  return SQLITE_OK;
}

static int nolockUnixLock(sqlite3_file *id, int locktype) {
  return SQLITE_OK;
}

static int nolockUnixUnlock(sqlite3_file *id, int locktype) {
  return SQLITE_OK;
}

/*
** Close a file.
*/
static int nolockUnixClose(sqlite3_file *id) {
  unixFile *pFile = (unixFile*)id;
  
  if( !pFile ) return SQLITE_OK;
  if( pFile->dirfd>=0 ) close(pFile->dirfd);
  pFile->dirfd = -1;
  enterMutex();
  close(pFile->h);
  leaveMutex();
  OSTRACE2("CLOSE   %-3d\n", pFile->h);
  OpenCounter(-1);
  memset(pFile, 0, sizeof(unixFile));
  return SQLITE_OK;
}

#endif /* SQLITE_ENABLE_LOCKING_STYLE */


/*
** Information and control of an open file handle.
................................................................................
** Return the device characteristics for the file. This is always 0.
*/
static int unixDeviceCharacteristics(sqlite3_file *id){
  return 0;
}

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix.
*/
static const sqlite3_io_methods sqlite3UnixIoMethod = {
  1,                        /* iVersion */
  unixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  unixLock,
  unixUnlock,
  unixCheckReservedLock,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

#ifdef SQLITE_ENABLE_LOCKING_STYLE
/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with AFP style file locking.
*/
static const sqlite3_io_methods sqlite3AFPLockingUnixIoMethod = {
  1,                        /* iVersion */
  afpUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  afpUnixLock,
  afpUnixUnlock,
  afpUnixCheckReservedLock,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with flock() style file locking.
*/
static const sqlite3_io_methods sqlite3FlockLockingUnixIoMethod = {
  1,                        /* iVersion */
  flockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  flockUnixLock,
  flockUnixUnlock,
  flockUnixCheckReservedLock,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with dotlock style file locking.
*/
static const sqlite3_io_methods sqlite3DotlockLockingUnixIoMethod = {
  1,                        /* iVersion */
  dotlockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  dotlockUnixLock,
  dotlockUnixUnlock,
  dotlockUnixCheckReservedLock,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with nolock style file locking.
*/
static const sqlite3_io_methods sqlite3NolockLockingUnixIoMethod = {
  1,                        /* iVersion */
  nolockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  nolockUnixLock,
  nolockUnixUnlock,
  nolockUnixCheckReservedLock,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
** Allocate memory for a new unixFile and initialize that unixFile.
** Write a pointer to the new unixFile into *pId.
** If we run out of memory, close the file and return an error.
*/
#ifdef SQLITE_ENABLE_LOCKING_STYLE
/* 
** When locking extensions are enabled, the filepath and locking style 
** are needed to determine the unixFile pMethod to use for locking operations.
** The locking-style specific lockingContext data structure is created 
** and assigned here also.
*/
static int fillInUnixFile(

  int h,                  /* Open file descriptor of file being opened */
  int dirfd,              /* Directory file descriptor */
  sqlite3_file *pId,      /* Write to the unixFile structure here */
  const char *zFilename   /* Name of the file being opened */
){
  sqlite3LockingStyle lockingStyle = noLockingStyle;
  unixFile *pNew = (unixFile *)pId;
  int rc;

















#ifdef FD_CLOEXEC
  fcntl(h, F_SETFD, fcntl(h, F_GETFD, 0) | FD_CLOEXEC);







#endif






  assert( pNew->pLock==NULL );
  assert( pNew->pOpen==NULL );
  if( zFilename ){
    /* If zFilename is NULL then this is a temporary file. Temporary files
    ** are never locked or unlocked, so noLockingStyle is used for these.
    ** The locking style used by other files is determined by 
    ** sqlite3DetectLockingStyle().
    */
    lockingStyle = sqlite3DetectLockingStyle(zFilename, h);
    if ( lockingStyle==posixLockingStyle ){
      enterMutex();
      rc = findLockInfo(h, &pNew->pLock, &pNew->pOpen);
      leaveMutex();
      if( rc ){
        if( dirfd>=0 ) close(dirfd);
        close(h);
        return rc;
      }
    }
  }

  OSTRACE3("OPEN    %-3d %s\n", h, zFilename);    
  pNew->h = h;
  pNew->dirfd = dirfd;
  SET_THREADID(pNew);
    
  switch(lockingStyle) {








    case afpLockingStyle: {










      /* afp locking uses the file path so it needs to be included in
      ** the afpLockingContext */

      afpLockingContext *context;
      pNew->pMethod = &sqlite3AFPLockingUnixIoMethod;
      pNew->lockingContext = context = sqlite3_malloc( sizeof(*context) );
      if( context==0 ){
        close(h);
        if( dirfd>=0 ) close(dirfd);
        return SQLITE_NOMEM;
      }


      /* NB: zFilename exists and remains valid until the file is closed
      ** according to requirement F11141.  So we do not need to make a
      ** copy of the filename. */
      context->filePath = zFilename;
      srandomdev();
      break;
    }
    case flockLockingStyle:
      /* flock locking doesn't need additional lockingContext information */
      pNew->pMethod = &sqlite3FlockLockingUnixIoMethod;
      break;
    case dotlockLockingStyle: {



      /* dotlock locking uses the file path so it needs to be included in
      ** the dotlockLockingContext */
      dotlockLockingContext *context;


      int nFilename;
      nFilename = strlen(zFilename);
      pNew->pMethod = &sqlite3DotlockLockingUnixIoMethod;
      pNew->lockingContext = context = 
         sqlite3_malloc( sizeof(*context) + nFilename + 6 );
      if( context==0 ){
        close(h);
        if( dirfd>=0 ) close(dirfd);


        return SQLITE_NOMEM;
      }
      context->lockPath = (char*)&context[1];
      sqlite3_snprintf(nFilename, context->lockPath,

                       "%s.lock", zFilename);
      break;
    }
    case posixLockingStyle:
      /* posix locking doesn't need additional lockingContext information */
      pNew->pMethod = &sqlite3UnixIoMethod;

      break;
    case noLockingStyle:
    case unsupportedLockingStyle:
    default: 
      pNew->pMethod = &sqlite3NolockLockingUnixIoMethod;
  }
  OpenCounter(+1);
  return SQLITE_OK;
}
#else /* SQLITE_ENABLE_LOCKING_STYLE */
static int fillInUnixFile(
  int h,                 /* Open file descriptor on file being opened */
  int dirfd,
  sqlite3_file *pId,     /* Write to the unixFile structure here */
  const char *zFilename  /* Name of the file being opened */
){
  unixFile *pNew = (unixFile *)pId;
  int rc;

#ifdef FD_CLOEXEC
  fcntl(h, F_SETFD, fcntl(h, F_GETFD, 0) | FD_CLOEXEC);
#endif

  enterMutex();
  rc = findLockInfo(h, &pNew->pLock, &pNew->pOpen);
  leaveMutex();

  if( rc ){
    if( dirfd>=0 ) close(dirfd);
    close(h);
    return rc;
  }

  OSTRACE3("OPEN    %-3d %s\n", h, zFilename);
  pNew->dirfd = -1;
  pNew->h = h;
  pNew->dirfd = dirfd;
  SET_THREADID(pNew);

  pNew->pMethod = &sqlite3UnixIoMethod;

  OpenCounter(+1);

  return SQLITE_OK;
}
#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
** Open a file descriptor to the directory containing file zFilename.
** If successful, *pFd is set to the opened file descriptor and
** SQLITE_OK is returned. If an error occurs, either SQLITE_NOMEM
** or SQLITE_CANTOPEN is returned and *pFd is set to an undefined
** value.
................................................................................
  **   (d) if DELETEONCLOSE is set, then CREATE must also be set.
  */
  assert((isReadonly==0 || isReadWrite==0) && (isReadWrite || isReadonly));
  assert(isCreate==0 || isReadWrite);
  assert(isExclusive==0 || isCreate);
  assert(isDelete==0 || isCreate);


  /* The main DB, main journal, and master journal are never automatically
  ** deleted
  */
  assert( eType!=SQLITE_OPEN_MAIN_DB || !isDelete );
  assert( eType!=SQLITE_OPEN_MAIN_JOURNAL || !isDelete );
  assert( eType!=SQLITE_OPEN_MASTER_JOURNAL || !isDelete );

  /* Assert that the upper layer has set one of the "file-type" flags. */
  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB 
       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL 
       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_MASTER_JOURNAL 
       || eType==SQLITE_OPEN_TRANSIENT_DB
  );



  if( !zName ){
    int rc;
    assert(isDelete && !isOpenDirectory);
    rc = getTempname(MAX_PATHNAME+1, zTmpname);
    if( rc!=SQLITE_OK ){
      return rc;
................................................................................

  if( isReadonly )  oflags |= O_RDONLY;
  if( isReadWrite ) oflags |= O_RDWR;
  if( isCreate )    oflags |= O_CREAT;
  if( isExclusive ) oflags |= (O_EXCL|O_NOFOLLOW);
  oflags |= (O_LARGEFILE|O_BINARY);

  memset(pFile, 0, sizeof(unixFile));
  fd = open(zName, oflags, isDelete?0600:SQLITE_DEFAULT_FILE_PERMISSIONS);
  if( fd<0 && errno!=EISDIR && isReadWrite && !isExclusive ){
    /* Failed to open the file for read/write access. Try read-only. */
    flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
    flags |= SQLITE_OPEN_READONLY;
    return unixOpen(pVfs, zPath, pFile, flags, pOutFlags);
  }
................................................................................
  if( isOpenDirectory ){
    int rc = openDirectory(zPath, &dirfd);
    if( rc!=SQLITE_OK ){
      close(fd);
      return rc;
    }
  }





  return fillInUnixFile(fd, dirfd, pFile, zPath);
}

/*
** Delete the file at zPath. If the dirSync argument is true, fsync()
** the directory after deleting the file.
*/
static int unixDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
................................................................................
}

static int unixGetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
  return 0;
}

/*
** Initialize and deinitialize the operating system interface.
*/
int sqlite3_os_init(void){ 
  static sqlite3_vfs unixVfs = {





    1,                  /* iVersion */
    sizeof(unixFile),   /* szOsFile */
    MAX_PATHNAME,       /* mxPathname */
    0,                  /* pNext */
    "unix",             /* zName */
    0,                  /* pAppData */
  

    unixOpen,           /* xOpen */
    unixDelete,         /* xDelete */
    unixAccess,         /* xAccess */
    unixFullPathname,   /* xFullPathname */
    unixDlOpen,         /* xDlOpen */
    unixDlError,        /* xDlError */
    unixDlSym,          /* xDlSym */
    unixDlClose,        /* xDlClose */
    unixRandomness,     /* xRandomness */
    unixSleep,          /* xSleep */
    unixCurrentTime,    /* xCurrentTime */
    unixGetLastError    /* xGetLastError */












  };





  sqlite3_vfs_register(&unixVfs, 1);
  return SQLITE_OK; 
}




int sqlite3_os_end(void){ 
  return SQLITE_OK; 
}
 
#endif /* SQLITE_OS_UNIX */







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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code that is specific to Unix systems.
**
** $Id: os_unix.c,v 1.191 2008/06/28 11:23:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#if SQLITE_OS_UNIX              /* This file is used on unix only */

/*
** If SQLITE_ENABLE_LOCKING_STYLE is defined, then several different 
** locking implementations are provided:
**
**   * POSIX locking (the default),
**   * No locking,
**   * Dot-file locking,
**   * flock() locking,
**   * AFP locking (OSX only).
*/
/* #define SQLITE_ENABLE_LOCKING_STYLE 0 */

/*
** These #defines should enable >2GB file support on Posix if the
** underlying operating system supports it.  If the OS lacks
** large file support, these should be no-ops.
**
................................................................................
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>

#ifdef SQLITE_ENABLE_LOCKING_STYLE
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/mount.h>
#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*
................................................................................
  */
  char aPadding[32];
#endif
  struct openCnt *pOpen;    /* Info about all open fd's on this inode */
  struct lockInfo *pLock;   /* Info about locks on this inode */
#ifdef SQLITE_ENABLE_LOCKING_STYLE
  void *lockingContext;     /* Locking style specific state */
#endif
  int h;                    /* The file descriptor */
  unsigned char locktype;   /* The type of lock held on this fd */
  int dirfd;                /* File descriptor for the directory */
#if SQLITE_THREADSAFE
  pthread_t tid;            /* The thread that "owns" this unixFile */
#endif
};
................................................................................
/*
** Here is the dirt on POSIX advisory locks:  ANSI STD 1003.1 (1996)
** section 6.5.2.2 lines 483 through 490 specify that when a process
** sets or clears a lock, that operation overrides any prior locks set
** by the same process.  It does not explicitly say so, but this implies
** that it overrides locks set by the same process using a different
** file descriptor.  Consider this test case:


**       int fd2 = open("./file2", O_RDWR|O_CREAT, 0644);
**
** Suppose ./file1 and ./file2 are really the same file (because
** one is a hard or symbolic link to the other) then if you set
** an exclusive lock on fd1, then try to get an exclusive lock
** on fd2, it works.  I would have expected the second lock to
** fail since there was already a lock on the file due to fd1.
................................................................................
** These hash tables map inodes and file descriptors (really, lockKey and
** openKey structures) into lockInfo and openCnt structures.  Access to 
** these hash tables must be protected by a mutex.
*/
static Hash lockHash = {SQLITE_HASH_BINARY, 0, 0, 0, 0, 0};
static Hash openHash = {SQLITE_HASH_BINARY, 0, 0, 0, 0, 0};


/*
** The locking styles are associated with the different file locking
** capabilities supported by different file systems.  
**
** POSIX locking style fully supports shared and exclusive byte-range locks 
** AFP locking only supports exclusive byte-range locks
** FLOCK only supports a single file-global exclusive lock
** DOTLOCK isn't a true locking style, it refers to the use of a special
**   file named the same as the database file with a '.lock' extension, this
**   can be used on file systems that do not offer any reliable file locking
** NO locking means that no locking will be attempted, this is only used for
**   read-only file systems currently
** UNSUPPORTED means that no locking will be attempted, this is only used for
**   file systems that are known to be unsupported
*/
#define LOCKING_STYLE_POSIX        1
#define LOCKING_STYLE_FLOCK        2
#define LOCKING_STYLE_DOTFILE      3
#define LOCKING_STYLE_NONE         4
#define LOCKING_STYLE_AFP          5





/*
** Helper functions to obtain and relinquish the global mutex.
*/
static void enterMutex(){
  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
................................................................................
}
#endif /* SQLITE_THREADSAFE */

/*
** Release a lockInfo structure previously allocated by findLockInfo().
*/
static void releaseLockInfo(struct lockInfo *pLock){
  if( pLock ){

    pLock->nRef--;
    if( pLock->nRef==0 ){
      sqlite3HashInsert(&lockHash, &pLock->key, sizeof(pLock->key), 0);
      sqlite3_free(pLock);
    }
  }
}

/*
** Release a openCnt structure previously allocated by findLockInfo().
*/
static void releaseOpenCnt(struct openCnt *pOpen){
  if( pOpen ){

    pOpen->nRef--;
    if( pOpen->nRef==0 ){
      sqlite3HashInsert(&openHash, &pOpen->key, sizeof(pOpen->key), 0);
      free(pOpen->aPending);
      sqlite3_free(pOpen);
    }
  }
}


/*
** Tests a byte-range locking query to see if byte range locks are 
** supported, if not we fall back to dotlockLockingStyle.
*/
static int testLockingStyle(int fd){
  struct flock lockInfo;

  /* Test byte-range lock using fcntl(). If the call succeeds, 
  ** assume that the file-system supports POSIX style locks. 
  */

  lockInfo.l_len = 1;
  lockInfo.l_start = 0;
  lockInfo.l_whence = SEEK_SET;
  lockInfo.l_type = F_RDLCK;

  if( fcntl(fd, F_GETLK, &lockInfo)!=-1 ) {

    return LOCKING_STYLE_POSIX;
  }
  
  /* Testing for flock() can give false positives.  So if if the above 
  ** test fails, then we fall back to using dot-file style locking.
  */  

  return LOCKING_STYLE_DOTFILE;
}

/* 
** If SQLITE_ENABLE_LOCKING_STYLE is defined, this function Examines the 
** f_fstypename entry in the statfs structure as returned by stat() for 
** the file system hosting the database file and selects  the appropriate
** locking style based on its value.  These values and assignments are 
** based on Darwin/OSX behavior and have not been thoroughly tested on 
** other systems.
**
** If SQLITE_ENABLE_LOCKING_STYLE is not defined, this function always
** returns LOCKING_STYLE_POSIX.
*/
static int detectLockingStyle(
  sqlite3_vfs *pVfs,
  const char *filePath, 
  int fd
){

#ifdef SQLITE_ENABLE_LOCKING_STYLE
  struct Mapping {
    const char *zFilesystem;
    int eLockingStyle;
  } aMap[] = {
    { "hfs",    LOCKING_STYLE_POSIX },
    { "ufs",    LOCKING_STYLE_POSIX },
    { "afpfs",  LOCKING_STYLE_AFP },
    { "smbfs",  LOCKING_STYLE_FLOCK },
    { "msdos",  LOCKING_STYLE_DOTFILE },
    { "webdav", LOCKING_STYLE_NONE },
    { 0, 0 }
  };
  int i;
  struct statfs fsInfo;



  if( !filePath ){
    return LOCKING_STYLE_NONE;
  }


  if( pVfs->pAppData ){
    return (int)pVfs->pAppData;
  }






  if( statfs(filePath, &fsInfo) != -1 ){
    if( fsInfo.f_flags & MNT_RDONLY ){
      return LOCKING_STYLE_NONE;
    }
    for(i=0; aMap[i].zFilesystem; i++){
      if( strcmp(fsInfo.f_fstypename, aMap[i].zFilesystem)==0 ){

        return aMap[i].eLockingStyle;
      }


    }


  }



  /* Default case. Handles, amongst others, "nfs". */
  return testLockingStyle(fd);  
#endif
  return LOCKING_STYLE_POSIX;
}



/*
** Given a file descriptor, locate lockInfo and openCnt structures that
** describes that file descriptor.  Create new ones if necessary.  The
** return values might be uninitialized if an error occurs.
**
** Return an appropriate error code.
................................................................................
      }
    }
  }
  leaveMutex();
  if( rc==SQLITE_OK ) pFile->locktype = locktype;
  return rc;
}

/*
** This function performs the parts of the "close file" operation 
** common to all locking schemes. It closes the directory and file
** handles, if they are valid, and sets all fields of the unixFile
** structure to 0.
*/
static int closeUnixFile(sqlite3_file *id){
  unixFile *pFile = (unixFile*)id;
  if( pFile ){
    if( pFile->dirfd>=0 ){
      close(pFile->dirfd);
    }
    if( pFile->h>=0 ){
      close(pFile->h);
    }
    OSTRACE2("CLOSE   %-3d\n", pFile->h);
    OpenCounter(-1);
    memset(pFile, 0, sizeof(unixFile));
  }
  return SQLITE_OK;
}

/*
** Close a file.
*/
static int unixClose(sqlite3_file *id){
  if( id ){
    unixFile *pFile = (unixFile *)id;

    unixUnlock(id, NO_LOCK);


    enterMutex();

    if( pFile->pOpen->nLock ){
      /* If there are outstanding locks, do not actually close the file just
      ** yet because that would clear those locks.  Instead, add the file
      ** descriptor to pOpen->aPending.  It will be automatically closed when
      ** the last lock is cleared.
      */
      int *aNew;
      struct openCnt *pOpen = pFile->pOpen;
      aNew = realloc( pOpen->aPending, (pOpen->nPending+1)*sizeof(int) );
      if( aNew==0 ){
        /* If a malloc fails, just leak the file descriptor */
      }else{
        pOpen->aPending = aNew;
        pOpen->aPending[pOpen->nPending] = pFile->h;
        pOpen->nPending++;
        pFile->h = -1;
      }



    }
    releaseLockInfo(pFile->pLock);
    releaseOpenCnt(pFile->pOpen);

    closeUnixFile(id);
    leaveMutex();



  }
  return SQLITE_OK;
}


#ifdef SQLITE_ENABLE_LOCKING_STYLE
#pragma mark AFP Support

................................................................................

/*
 ** This routine checks if there is a RESERVED lock held on the specified
 ** file by this or any other process. If such a lock is held, return
 ** non-zero.  If the file is unlocked or holds only SHARED locks, then
 ** return zero.
 */
static int afpCheckReservedLock(sqlite3_file *id, int *pResOut){
  int r = 0;
  unixFile *pFile = (unixFile*)id;
  
  assert( pFile ); 
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;
  
  /* Check if a thread in this process holds such a lock */
................................................................................
  
  *pResOut = r;
  return SQLITE_OK;
}

/* AFP-style locking following the behavior of unixLock, see the unixLock 
** function comments for details of lock management. */
static int afpLock(sqlite3_file *id, int locktype){
  int rc = SQLITE_OK;
  unixFile *pFile = (unixFile*)id;
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;

  
  assert( pFile );
  OSTRACE5("LOCK    %d %s was %s pid=%d\n", pFile->h,
         locktypeName(locktype), locktypeName(pFile->locktype), getpid());

  /* If there is already a lock of this type or more restrictive on the
  ** unixFile, do nothing. Don't use the afp_end_lock: exit path, as
................................................................................
  }
  
  /* If control gets to this point, then actually go ahead and make
  ** operating system calls for the specified lock.
  */
  if( locktype==SHARED_LOCK ){
    int lk, failed;

    
    /* Now get the read-lock */
    /* note that the quality of the randomness doesn't matter that much */
    lk = random(); 
    context->sharedLockByte = (lk & 0x7fffffff)%(SHARED_SIZE - 1);
    failed = _AFPFSSetLock(context->filePath, pFile->h, 
      SHARED_FIRST+context->sharedLockByte, 1, 1);
................................................................................
        /* Acquire a RESERVED lock */
        failed = _AFPFSSetLock(context->filePath, pFile->h, RESERVED_BYTE, 1,1);
    }
    if (!failed && locktype == EXCLUSIVE_LOCK) {
      /* Acquire an EXCLUSIVE lock */
        
      /* Remove the shared lock before trying the range.  we'll need to 
      ** reestablish the shared lock if we can't get the  afpUnlock
      */
      if (!_AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST +
                         context->sharedLockByte, 1, 0)) {
        /* now attemmpt to get the exclusive lock range */
        failed = _AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST, 
                               SHARED_SIZE, 1);
        if (failed && _AFPFSSetLock(context->filePath, pFile->h, SHARED_FIRST +
................................................................................
/*
** Lower the locking level on file descriptor pFile to locktype.  locktype
** must be either NO_LOCK or SHARED_LOCK.
**
** If the locking level of the file descriptor is already at or below
** the requested locking level, this routine is a no-op.
*/
static int afpUnlock(sqlite3_file *id, int locktype) {

  int rc = SQLITE_OK;
  unixFile *pFile = (unixFile*)id;
  afpLockingContext *context = (afpLockingContext *) pFile->lockingContext;

  assert( pFile );
  OSTRACE5("UNLOCK  %d %d was %d pid=%d\n", pFile->h, locktype,
         pFile->locktype, getpid());
................................................................................
  leaveMutex();
  return rc;
}

/*
** Close a file & cleanup AFP specific locking context 
*/
static int afpClose(sqlite3_file *id) {
  if( id ){
    unixFile *pFile = (unixFile*)id;


    afpUnlock(id, NO_LOCK);
    sqlite3_free(pFile->lockingContext);
  }
  return closeUnixFile(id);








}


#pragma mark flock() style locking

/*
** The flockLockingContext is not used
*/
typedef void flockLockingContext;

static int flockCheckReservedLock(sqlite3_file *id, int *pResOut){
  int r = 1;
  unixFile *pFile = (unixFile*)id;
  
  if (pFile->locktype != RESERVED_LOCK) {
    /* attempt to get the lock */
    int rc = flock(pFile->h, LOCK_EX | LOCK_NB);
    if (!rc) {
................................................................................
    }
  }

  *pResOut = r;
  return SQLITE_OK;
}

static int flockLock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  
  /* if we already have a lock, it is exclusive.  
  ** Just adjust level and punt on outta here. */
  if (pFile->locktype > NO_LOCK) {
    pFile->locktype = locktype;
    return SQLITE_OK;
................................................................................
  } else {
    /* got it, set the type and return ok */
    pFile->locktype = locktype;
    return SQLITE_OK;
  }
}

static int flockUnlock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;
  
  assert( locktype<=SHARED_LOCK );
  
  /* no-op if possible */
  if( pFile->locktype==locktype ){
    return SQLITE_OK;
................................................................................
    return SQLITE_OK;
  }
}

/*
** Close a file.
*/
static int flockClose(sqlite3_file *id) {
  if( id ){


    flockUnlock(id, NO_LOCK);
  }


  return closeUnixFile(id);
}









#pragma mark Old-School .lock file based locking











static int dotlockCheckReservedLock(sqlite3_file *id, int *pResOut) {
  int r = 1;
  unixFile *pFile = (unixFile*)id;

  char *zLockFile = (char *)pFile->lockingContext;


  if (pFile->locktype != RESERVED_LOCK) {
    struct stat statBuf;
    if (lstat(zLockFile, &statBuf) != 0){
      /* file does not exist, we could have it if we want it */
      r = 0;
    }
  }

  *pResOut = r;
  return SQLITE_OK;
}

static int dotlockLock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;

  int fd;

  char *zLockFile = (char *)pFile->lockingContext;

  /* if we already have a lock, it is exclusive.  
  ** Just adjust level and punt on outta here. */
  if (pFile->locktype > NO_LOCK) {
    pFile->locktype = locktype;
    
    /* Always update the timestamp on the old file */
    utimes(zLockFile, NULL);
    return SQLITE_OK;
  }
  
  /* check to see if lock file already exists */
  struct stat statBuf;
  if (lstat(zLockFile,&statBuf) == 0){
    return SQLITE_BUSY; /* it does, busy */
  }
  
  /* grab an exclusive lock */
  fd = open(zLockFile,O_RDONLY|O_CREAT|O_EXCL,0600);
  if( fd<0 ){
    /* failed to open/create the file, someone else may have stolen the lock */
    return SQLITE_BUSY; 
  }
  close(fd);
  
  /* got it, set the type and return ok */
  pFile->locktype = locktype;
  return SQLITE_OK;
}

static int dotlockUnlock(sqlite3_file *id, int locktype) {
  unixFile *pFile = (unixFile*)id;


  char *zLockFile = (char *)pFile->lockingContext;

  assert( locktype<=SHARED_LOCK );
  
  /* no-op if possible */
  if( pFile->locktype==locktype ){
    return SQLITE_OK;
  }
  
................................................................................
  /* shared can just be set because we always have an exclusive */
  if (locktype==SHARED_LOCK) {
    pFile->locktype = locktype;
    return SQLITE_OK;
  }
  
  /* no, really, unlock. */
  unlink(zLockFile);
  pFile->locktype = NO_LOCK;
  return SQLITE_OK;
}

/*
 ** Close a file.
 */
static int dotlockClose(sqlite3_file *id) {
  if( id ){
    unixFile *pFile = (unixFile*)id;


    dotlockUnlock(id, NO_LOCK);
    sqlite3_free(pFile->lockingContext);
  }
  return closeUnixFile(id);








}


#pragma mark No locking

/*
** The nolockLockingContext is void
*/
typedef void nolockLockingContext;

static int nolockCheckReservedLock(sqlite3_file *id, int *pResOut) {
  *pResOut = 0;
  return SQLITE_OK;
}

static int nolockLock(sqlite3_file *id, int locktype) {
  return SQLITE_OK;
}

static int nolockUnlock(sqlite3_file *id, int locktype) {
  return SQLITE_OK;
}

/*
** Close a file.
*/
static int nolockClose(sqlite3_file *id) {
  return closeUnixFile(id);











}

#endif /* SQLITE_ENABLE_LOCKING_STYLE */


/*
** Information and control of an open file handle.
................................................................................
** Return the device characteristics for the file. This is always 0.
*/
static int unixDeviceCharacteristics(sqlite3_file *id){
  return 0;
}

/*
** Initialize the contents of the unixFile structure pointed to by pId.

**










































































































** When locking extensions are enabled, the filepath and locking style 
** are needed to determine the unixFile pMethod to use for locking operations.
** The locking-style specific lockingContext data structure is created 
** and assigned here also.
*/
static int fillInUnixFile(
  sqlite3_vfs *pVfs,      /* Pointer to vfs object */
  int h,                  /* Open file descriptor of file being opened */
  int dirfd,              /* Directory file descriptor */
  sqlite3_file *pId,      /* Write to the unixFile structure here */
  const char *zFilename   /* Name of the file being opened */
){
  /* Macro to define the static contents of an sqlite3_io_methods 
  ** structure for a unix backend file. Different locking methods
  ** require different functions for the xClose, xLock, xUnlock and
  ** xCheckReservedLock methods.
  */
  #define IOMETHODS(xClose, xLock, xUnlock, xCheckReservedLock) {    \
    1,                          /* iVersion */                           \
    xClose,                     /* xClose */                             \
    unixRead,                   /* xRead */                              \
    unixWrite,                  /* xWrite */                             \
    unixTruncate,               /* xTruncate */                          \
    unixSync,                   /* xSync */                              \
    unixFileSize,               /* xFileSize */                          \
    xLock,                      /* xLock */                              \
    xUnlock,                    /* xUnlock */                            \
    xCheckReservedLock,         /* xCheckReservedLock */                 \
    unixFileControl,            /* xFileControl */                       \
    unixSectorSize,             /* xSectorSize */                        \
    unixDeviceCharacteristics   /* xDeviceCapabilities */                \
  }


  static sqlite3_io_methods aIoMethod[] = {
    IOMETHODS(unixClose, unixLock, unixUnlock, unixCheckReservedLock) 
#ifdef SQLITE_ENABLE_LOCKING_STYLE
   ,IOMETHODS(flockClose, flockLock, flockUnlock, flockCheckReservedLock)
   ,IOMETHODS(dotlockClose, dotlockLock, dotlockUnlock,dotlockCheckReservedLock)
   ,IOMETHODS(nolockClose, nolockLock, nolockUnlock, nolockCheckReservedLock)
   ,IOMETHODS(afpClose, afpLock, afpUnlock, afpCheckReservedLock)
#endif
  };

  int eLockingStyle;
  unixFile *pNew = (unixFile *)pId;
  int rc = SQLITE_OK;

  assert( pNew->pLock==NULL );
  assert( pNew->pOpen==NULL );



















  OSTRACE3("OPEN    %-3d %s\n", h, zFilename);    
  pNew->h = h;
  pNew->dirfd = dirfd;
  SET_THREADID(pNew);


  assert(LOCKING_STYLE_POSIX==1);
  assert(LOCKING_STYLE_FLOCK==2);
  assert(LOCKING_STYLE_DOTFILE==3);
  assert(LOCKING_STYLE_NONE==4);
  assert(LOCKING_STYLE_AFP==5);
  eLockingStyle = detectLockingStyle(pVfs, zFilename, h);
  pNew->pMethod = &aIoMethod[eLockingStyle-1];

  switch( eLockingStyle ){

    case LOCKING_STYLE_POSIX: {
      enterMutex();
      rc = findLockInfo(h, &pNew->pLock, &pNew->pOpen);
      leaveMutex();
      break;
    }

#ifdef SQLITE_ENABLE_LOCKING_STYLE
    case LOCKING_STYLE_AFP: {
      /* AFP locking uses the file path so it needs to be included in
      ** the afpLockingContext.
      */
      afpLockingContext *pCtx;

      pNew->lockingContext = pCtx = sqlite3_malloc( sizeof(*pCtx) );
      if( pCtx==0 ){


        rc = SQLITE_NOMEM;


      }else{
        /* NB: zFilename exists and remains valid until the file is closed
        ** according to requirement F11141.  So we do not need to make a
        ** copy of the filename. */
        pCtx->filePath = zFilename;
        srandomdev();

      }



      break;

    }

    case LOCKING_STYLE_DOTFILE: {
      /* Dotfile locking uses the file path so it needs to be included in
      ** the dotlockLockingContext 

      */
      char *zLockFile;
      int nFilename;
      nFilename = strlen(zFilename) + 6;






      zLockFile = (char *)sqlite3_malloc(nFilename);
      if( zLockFile==0 ){
        rc = SQLITE_NOMEM;



      }else{
        sqlite3_snprintf(nFilename, zLockFile, "%s.lock", zFilename);

      }



      pNew->lockingContext = zLockFile;
      break;




    }



    case LOCKING_STYLE_FLOCK: 






    case LOCKING_STYLE_NONE: 
      break;



#endif
  }




  if( rc!=SQLITE_OK ){
    if( dirfd>=0 ) close(dirfd);
    close(h);










  }else{
    OpenCounter(+1);
  }
  return rc;
}


/*
** Open a file descriptor to the directory containing file zFilename.
** If successful, *pFd is set to the opened file descriptor and
** SQLITE_OK is returned. If an error occurs, either SQLITE_NOMEM
** or SQLITE_CANTOPEN is returned and *pFd is set to an undefined
** value.
................................................................................
  **   (d) if DELETEONCLOSE is set, then CREATE must also be set.
  */
  assert((isReadonly==0 || isReadWrite==0) && (isReadWrite || isReadonly));
  assert(isCreate==0 || isReadWrite);
  assert(isExclusive==0 || isCreate);
  assert(isDelete==0 || isCreate);


  /* The main DB, main journal, and master journal are never automatically
  ** deleted
  */
  assert( eType!=SQLITE_OPEN_MAIN_DB || !isDelete );
  assert( eType!=SQLITE_OPEN_MAIN_JOURNAL || !isDelete );
  assert( eType!=SQLITE_OPEN_MASTER_JOURNAL || !isDelete );

  /* Assert that the upper layer has set one of the "file-type" flags. */
  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB 
       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL 
       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_MASTER_JOURNAL 
       || eType==SQLITE_OPEN_TRANSIENT_DB
  );

  memset(pFile, 0, sizeof(unixFile));

  if( !zName ){
    int rc;
    assert(isDelete && !isOpenDirectory);
    rc = getTempname(MAX_PATHNAME+1, zTmpname);
    if( rc!=SQLITE_OK ){
      return rc;
................................................................................

  if( isReadonly )  oflags |= O_RDONLY;
  if( isReadWrite ) oflags |= O_RDWR;
  if( isCreate )    oflags |= O_CREAT;
  if( isExclusive ) oflags |= (O_EXCL|O_NOFOLLOW);
  oflags |= (O_LARGEFILE|O_BINARY);


  fd = open(zName, oflags, isDelete?0600:SQLITE_DEFAULT_FILE_PERMISSIONS);
  if( fd<0 && errno!=EISDIR && isReadWrite && !isExclusive ){
    /* Failed to open the file for read/write access. Try read-only. */
    flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
    flags |= SQLITE_OPEN_READONLY;
    return unixOpen(pVfs, zPath, pFile, flags, pOutFlags);
  }
................................................................................
  if( isOpenDirectory ){
    int rc = openDirectory(zPath, &dirfd);
    if( rc!=SQLITE_OK ){
      close(fd);
      return rc;
    }
  }

#ifdef FD_CLOEXEC
  fcntl(fd, F_SETFD, fcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif

  return fillInUnixFile(pVfs, fd, dirfd, pFile, zPath);
}

/*
** Delete the file at zPath. If the dirSync argument is true, fsync()
** the directory after deleting the file.
*/
static int unixDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
................................................................................
}

static int unixGetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
  return 0;
}

/*
** Initialize the operating system interface.
*/
int sqlite3_os_init(void){ 
  /* Macro to define the static contents of an sqlite3_vfs structure for
  ** the unix backend. The two parameters are the values to use for
  ** the sqlite3_vfs.zName and sqlite3_vfs.pAppData fields, respectively.
  ** 
  */
  #define UNIXVFS(zVfsName, pVfsAppData) {                  \
    1,                    /* iVersion */                    \
    sizeof(unixFile),     /* szOsFile */                    \
    MAX_PATHNAME,         /* mxPathname */                  \
    0,                    /* pNext */                       \
    zVfsName,             /* zName */                       \


    (void *)pVfsAppData,  /* pAppData */                    \
    unixOpen,             /* xOpen */                       \
    unixDelete,           /* xDelete */                     \
    unixAccess,           /* xAccess */                     \
    unixFullPathname,     /* xFullPathname */               \
    unixDlOpen,           /* xDlOpen */                     \
    unixDlError,          /* xDlError */                    \
    unixDlSym,            /* xDlSym */                      \
    unixDlClose,          /* xDlClose */                    \
    unixRandomness,       /* xRandomness */                 \
    unixSleep,            /* xSleep */                      \
    unixCurrentTime,      /* xCurrentTime */                \
    unixGetLastError      /* xGetLastError */               \
  }

  static sqlite3_vfs unixVfs = UNIXVFS("unix", 0);
#ifdef SQLITE_ENABLE_LOCKING_STYLE
#if 0
  int i;
  static sqlite3_vfs aVfs[] = {
    UNIXVFS("unix-posix",   LOCKING_STYLE_POSIX), 
    UNIXVFS("unix-afp",     LOCKING_STYLE_AFP), 
    UNIXVFS("unix-flock",   LOCKING_STYLE_FLOCK), 
    UNIXVFS("unix-dotfile", LOCKING_STYLE_DOTFILE), 
    UNIXVFS("unix-none",    LOCKING_STYLE_NONE)
  };
  for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
    sqlite3_vfs_register(&aVfs[i], 0);
  }
#endif
#endif
  sqlite3_vfs_register(&unixVfs, 1);
  return SQLITE_OK; 
}

/*
** Shutdown the operating system interface. This is a no-op for unix.
*/
int sqlite3_os_end(void){ 
  return SQLITE_OK; 
}
 
#endif /* SQLITE_OS_UNIX */

Changes to src/sqlite.h.in.
26
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30
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32
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34
35
36
37
38
39
40
....
1105
1106
1107
1108
1109
1110
1111
1112


1113
1114
1115
1116
1117
1118
1119
....
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149





1150
1151
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1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.361 2008/06/27 14:51:53 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
** <dd>This option specifies a static memory buffer that SQLite will use
** for all of its dynamic memory allocation needs beyond those provided
** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
** There are three arguments: A pointer to the memory, the number of
** bytes in the memory buffer, and the minimum allocation size.  When
** this configuration option is used, SQLite never calls the system
** malloc() implementation but instead uses the supplied memory buffer
** to satisfy all [sqlite3_malloc()] requests.</dd>


**
** <dt>SQLITE_CONFIG_MUTEX</dt>
** <dd>This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
** alternative low-level mutex routines to be used in place
** the mutex routines built into SQLite.</dd>
**
................................................................................
** structure is filled with the currently defined mutex routines.
** This option can be used to overload the default mutex allocation
** routines with a wrapper used to track mutex usage for performance
** profiling or testing, for example.</dd>
**
** <dt>SQLITE_CONFIG_MEMSYS3</dt>
** <dd>This option is only available if SQLite is compiled with the 
** SQLITE_ENABLE_MEMSYS3 symbol defined. If available, then it is used
** to install an alternative set of built-in memory allocation routines
** known as the "memsys3" allocator (in the same way as SQLITE_CONFIG_MALLOC
** may be used to install an external set of memory allocation routines).
** This options must be passed two arguments, a pointer to a large blob of
** allocated memory (type char*) and the size of the block of memory in bytes
** (type int). The memsys3 allocator manages this block of memory and uses
** it to satisfy all requests for dynamic memory made by the library. The
** caller must ensure that the block of memory remains valid for as long
** as the memsys3 allocator is in use.</dd>
**
** <dt>SQLITE_CONFIG_MEMSYS5</dt>
** <dd>This option is only available if SQLite is compiled with the 
** SQLITE_ENABLE_MEMSYS5 symbol defined. If available, then it is similar
** to the SQLITE_CONFIG_MEMSYS3 option. The "memsys5" allocator differs
** from the "memsys3" allocator in that it rounds all allocations up to
** the next largest power of two. Although this is sometimes more wasteful
** than the procedures used by memsys3, it guarantees an upper limit on
** internal fragmentation.</dd>





** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
#define SQLITE_CONFIG_MALLOC        4  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_GETMALLOC     5  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_SCRATCH       6  /* void*, int sz, int N */
#define SQLITE_CONFIG_PAGECACHE     7  /* void*, int sz, int N */
#define SQLITE_CONFIG_HEAP          8  /* void*, int nByte, int min */
#define SQLITE_CONFIG_MEMSTATUS     9  /* boolean */
#define SQLITE_CONFIG_MUTEX        10  /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_GETMUTEX     11  /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_MEMSYS3      12  /* u8*, int */
#define SQLITE_CONFIG_MEMSYS5      13  /* u8*, int */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes {F12200}
**
** The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. The extended result
** codes are disabled by default for historical compatibility considerations.







|







 







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>







 







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<
<
<
<
<
<



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<
<
<
<
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26
27
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29
30
31
32
33
34
35
36
37
38
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40
....
1105
1106
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1108
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1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
....
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136






1137
1138
1139
1140





1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.362 2008/06/28 11:23:00 danielk1977 Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
** <dd>This option specifies a static memory buffer that SQLite will use
** for all of its dynamic memory allocation needs beyond those provided
** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
** There are three arguments: A pointer to the memory, the number of
** bytes in the memory buffer, and the minimum allocation size.  When
** this configuration option is used, SQLite never calls the system
** malloc() implementation but instead uses the supplied memory buffer
** to satisfy all [sqlite3_malloc()] requests. This option is only
** available if either or both of SQLITE_ENABLE_MEMSYS3 and 
** SQLITE_ENABLE_MEMSYS5 are defined during compilation.</dd>
**
** <dt>SQLITE_CONFIG_MUTEX</dt>
** <dd>This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
** alternative low-level mutex routines to be used in place
** the mutex routines built into SQLite.</dd>
**
................................................................................
** structure is filled with the currently defined mutex routines.
** This option can be used to overload the default mutex allocation
** routines with a wrapper used to track mutex usage for performance
** profiling or testing, for example.</dd>
**
** <dt>SQLITE_CONFIG_MEMSYS3</dt>
** <dd>This option is only available if SQLite is compiled with the 
** SQLITE_ENABLE_MEMSYS3 symbol defined. It selects one of two memory
** allocation systems that use the block of memory supplied to sqlite 
** using the SQLITE_CONFIG_HEAP option.
** </dd>






**
** <dt>SQLITE_CONFIG_MEMSYS5</dt>
** <dd>This option is only available if SQLite is compiled with the 
** SQLITE_ENABLE_MEMSYS5 symbol defined. It selects one of two memory





** allocation systems that use the block of memory supplied to sqlite 
** using the SQLITE_CONFIG_HEAP option. The memory allocation system
** selected by this option, "memsys5", is also installed by default 
** when the SQLITE_CONFIG_HEAP option is set, so it is not usually
** necessary to use this option directly.
** </dd>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
#define SQLITE_CONFIG_MALLOC        4  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_GETMALLOC     5  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_SCRATCH       6  /* void*, int sz, int N */
#define SQLITE_CONFIG_PAGECACHE     7  /* void*, int sz, int N */
#define SQLITE_CONFIG_HEAP          8  /* void*, int nByte, int min */
#define SQLITE_CONFIG_MEMSTATUS     9  /* boolean */
#define SQLITE_CONFIG_MUTEX        10  /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_GETMUTEX     11  /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_MEMSYS3      12  /* nil */
#define SQLITE_CONFIG_MEMSYS5      13  /* nil */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes {F12200}
**
** The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. The extended result
** codes are disabled by default for historical compatibility considerations.

Changes to src/test1.c.
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
....
4444
4445
4446
4447
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4449
4450
























4451
4452
4453
4454
4455
4456
4457
....
4689
4690
4691
4692
4693
4694
4695

4696
4697
4698
4699
4700
4701
4702
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing all sorts of SQLite interfaces.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.307 2008/06/26 10:41:19 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

/*
................................................................................
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "main", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "temp", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  return TCL_OK;  
}

























/*
** tclcmd:   sqlite3_limit DB ID VALUE
**
** This TCL command runs the sqlite3_limit interface and
** verifies correct operation of the same.
*/
................................................................................
#endif
#endif
     { "sqlite3_create_collation_v2", test_create_collation_v2, 0 },
     { "sqlite3_global_recover",     test_global_recover, 0   },
     { "working_64bit_int",          working_64bit_int,   0   },
     { "vfs_unlink_test",            vfs_unlink_test,     0   },
     { "file_control_test",          file_control_test,   0   },


     /* Functions from os.h */
#ifndef SQLITE_OMIT_DISKIO
#if 0
     { "sqlite3OsOpenReadWrite",test_sqlite3OsOpenReadWrite, 0 },
     { "sqlite3OsClose",        test_sqlite3OsClose, 0 },
     { "sqlite3OsLock",         test_sqlite3OsLock, 0 },







|







 







>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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>
>
>
>
>
>
>







 







>







9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
....
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
....
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing all sorts of SQLite interfaces.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.308 2008/06/28 11:23:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

/*
................................................................................
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "main", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "temp", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  return TCL_OK;  
}

/*
** tclcmd:   sqlite3_vfs_list
**
**   Return a tcl list containing the names of all registered vfs's.
*/
static int vfs_list(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  sqlite3_vfs *pVfs;
  Tcl_Obj *pRet = Tcl_NewObj();
  if( objc!=1 ){
    Tcl_WrongNumArgs(interp, 1, objv, "");
    return TCL_ERROR;
  }
  for(pVfs=sqlite3_vfs_find(0); pVfs; pVfs=pVfs->pNext){
    Tcl_ListObjAppendElement(interp, pRet, Tcl_NewStringObj(pVfs->zName, -1));
  }
  Tcl_SetObjResult(interp, pRet);
  return TCL_OK;  
}

/*
** tclcmd:   sqlite3_limit DB ID VALUE
**
** This TCL command runs the sqlite3_limit interface and
** verifies correct operation of the same.
*/
................................................................................
#endif
#endif
     { "sqlite3_create_collation_v2", test_create_collation_v2, 0 },
     { "sqlite3_global_recover",     test_global_recover, 0   },
     { "working_64bit_int",          working_64bit_int,   0   },
     { "vfs_unlink_test",            vfs_unlink_test,     0   },
     { "file_control_test",          file_control_test,   0   },
     { "sqlite3_vfs_list",           vfs_list,     0   },

     /* Functions from os.h */
#ifndef SQLITE_OMIT_DISKIO
#if 0
     { "sqlite3OsOpenReadWrite",test_sqlite3OsOpenReadWrite, 0 },
     { "sqlite3OsClose",        test_sqlite3OsClose, 0 },
     { "sqlite3OsLock",         test_sqlite3OsLock, 0 },

Added test/lock5.test.




































































































































































































































































































































































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# 2008 June 28
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is database locks.
#
# $Id: lock5.test,v 1.1 2008/06/28 11:23:00 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# This file is only run if using the unix backend compiled with the
# SQLITE_ENABLE_LOCKING_STYLE macro.
db close
if {[catch {sqlite3 db test.db -vfs unix-none} msg]} {
puts $msg
  finish_test
  return
}
db close

do_test lock5-dotfile.1 {
  sqlite3 db test.db -vfs unix-dotfile
  execsql {
    BEGIN;
    CREATE TABLE t1(a, b);
  }
} {}

do_test lock5-dotfile.2 {
  file exists test.db.lock
} {1}

do_test lock5-dotfile.3 {
  execsql COMMIT
  file exists test.db.lock
} {0}

do_test lock5-dotfile.4 {
  sqlite3 db2 test.db -vfs unix-dotfile
  execsql {
    INSERT INTO t1 VALUES('a', 'b');
    SELECT * FROM t1;
  } db2
} {a b}

do_test lock5-dotfile.5 {
  execsql {
    BEGIN;
    SELECT * FROM t1;
  } db2
} {a b}

do_test lock5-dotfile.6 {
  file exists test.db.lock
} {1}

do_test lock5-dotfile.7 {
  catchsql { SELECT * FROM t1; }
} {1 {database is locked}}

do_test lock5-dotfile.8 {
  execsql {
    SELECT * FROM t1;
    ROLLBACK;
  } db2
} {a b}

do_test lock5-dotfile.9 {
  catchsql { SELECT * FROM t1; }
} {0 {a b}}

do_test lock5-dotfile.10 {
  file exists test.db.lock
} {0}

do_test lock5-dotfile.X {
  db2 close
  execsql {BEGIN EXCLUSIVE}
  db close
  file exists test.db.lock
} {0}

#####################################################################

file delete -force test.db

do_test lock5-flock.1 {
  sqlite3 db test.db -vfs unix-flock
  execsql {
    CREATE TABLE t1(a, b);
    BEGIN;
    INSERT INTO t1 VALUES(1, 2);
  }
} {}

# Make sure we are not accidentally using the dotfile locking scheme.
do_test lock5-flock.2 {
  file exists test.db.lock
} {0}

do_test lock5-flock.3 {
  sqlite3 db2 test.db -vfs unix-flock
  catchsql { SELECT * FROM t1 } db2
} {1 {database is locked}}

do_test lock5-flock.4 {
  execsql COMMIT
  catchsql { SELECT * FROM t1 } db2
} {0 {1 2}}

do_test lock5-flock.5 {
  execsql BEGIN
  catchsql { SELECT * FROM t1 } db2
} {0 {1 2}}

do_test lock5-flock.6 {
  execsql {SELECT * FROM t1}
  catchsql { SELECT * FROM t1 } db2
} {1 {database is locked}}

do_test lock5-flock.7 {
  db close
  catchsql { SELECT * FROM t1 } db2
} {0 {1 2}}

do_test lock5-flock.8 {
  db2 close
} {}

#####################################################################

do_test lock5-none.1 {
  sqlite3 db test.db -vfs unix-none
  sqlite3 db2 test.db -vfs unix-none
  execsql {
    BEGIN;
    INSERT INTO t1 VALUES(3, 4);
  }
} {}
do_test lock5-none.2 {
  execsql { SELECT * FROM t1 }
} {1 2 3 4}
do_test lock5-flock.3 {
  execsql { SELECT * FROM t1 } db2
} {1 2}
do_test lock5-none.4 {
  execsql { 
    BEGIN;
    SELECT * FROM t1;
  } db2
} {1 2}
do_test lock5-none.5 {
  execsql COMMIT
  execsql {SELECT * FROM t1} db2
} {1 2}

ifcapable memorymanage {
  do_test lock5-none.6 {
    sqlite3_release_memory 1000000
    execsql {SELECT * FROM t1} db2
  } {1 2 3 4}
}

do_test lock5-flock.X {
  db close
  db2 close
} {}

finish_test

Changes to test/mutex1.test.
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#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# $Id: mutex1.test,v 1.5 2008/06/26 08:29:35 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
sqlite3_reset_auto_extension

proc mutex_counters {varname} {
  upvar $varname var
................................................................................

do_test mutex1-1.6 {
  sqlite3_initialize
} {SQLITE_OK}

do_test mutex1-1.7 {
  mutex_counters counters
  list $counters(total) $counters(static_master)

} {6 3}

do_test mutex1-1.8 {
  clear_mutex_counters
  sqlite3_initialize
} {SQLITE_OK}

do_test mutex1-1.9 {
................................................................................

ifcapable threadsafe {
  foreach {mode mutexes} {
    singlethread {}
    multithread  {fast static_master static_mem static_prng}
    serialized   {fast recursive static_master static_mem static_prng}
  } {






    do_test mutex1.2.$mode.1 {
      catch {db close}
      sqlite3_shutdown
      sqlite3_config $mode
    } SQLITE_OK

    do_test mutex1.2.$mode.2 {







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#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# $Id: mutex1.test,v 1.6 2008/06/28 11:23:00 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
sqlite3_reset_auto_extension

proc mutex_counters {varname} {
  upvar $varname var
................................................................................

do_test mutex1-1.6 {
  sqlite3_initialize
} {SQLITE_OK}

do_test mutex1-1.7 {
  mutex_counters counters
  # list $counters(total) $counters(static_master)
  expr {$counters(total)>0}
} {1}

do_test mutex1-1.8 {
  clear_mutex_counters
  sqlite3_initialize
} {SQLITE_OK}

do_test mutex1-1.9 {
................................................................................

ifcapable threadsafe {
  foreach {mode mutexes} {
    singlethread {}
    multithread  {fast static_master static_mem static_prng}
    serialized   {fast recursive static_master static_mem static_prng}
  } {
    ifcapable memorymanage {
      if {$mode ne "singlethread"} {
        lappend mutexes static_lru static_lru2 static_mem2
        set mutexes [lsort $mutexes]
      }
    }
    do_test mutex1.2.$mode.1 {
      catch {db close}
      sqlite3_shutdown
      sqlite3_config $mode
    } SQLITE_OK

    do_test mutex1.2.$mode.2 {