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Changes to src/os_unix.c.

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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.

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** 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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** 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.

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** 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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** 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 {