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Overview
Comment:Detect the presence of pread()/pwrite() system calls on unix systems and use them if available.
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SHA1: 82cbf5ad2ed988a006106e188e98096a52e6779d
User & Date: drh 2016-03-04 03:20:05.475
Context
2016-03-04
03:43
Change the default page size for new database files to 4096 (from 1024). Except, when building the testfixture, preserve the legacy page size. Also fix a comment on SQLITE_MAX_ATTACHED. (check-in: 2e8a9ca9d3 user: drh tags: trunk)
03:20
Detect the presence of pread()/pwrite() system calls on unix systems and use them if available. (check-in: 82cbf5ad2e user: drh tags: trunk)
03:14
Further fixes to the pread()/pwrite() enabling logic. (Closed-Leaf check-in: 38fb54e785 user: drh tags: pread)
02:59
Add the test_bestindex.c file to Makefile.in and Makefile.msc so that "make test" will work again. (check-in: 6ec6b6a97e user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to config.h.in.
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#undef HAVE_MALLOC_H

/* Define to 1 if you have the `malloc_usable_size' function. */
#undef HAVE_MALLOC_USABLE_SIZE

/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H













/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H

/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H









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#undef HAVE_MALLOC_H

/* Define to 1 if you have the `malloc_usable_size' function. */
#undef HAVE_MALLOC_USABLE_SIZE

/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H

/* Define to 1 if you have the pread() function. */
#undef HAVE_PREAD

/* Define to 1 if you have the pread64() function. */
#undef HAVE_PREAD64

/* Define to 1 if you have the pwrite() function. */
#undef HAVE_PWRITE

/* Define to 1 if you have the pwrite64() function. */
#undef HAVE_PWRITE64

/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H

/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
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Changes to configure.
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done


#########
# Figure out whether or not we have these functions
#
for ac_func in fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime
do :
  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
  cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
_ACEOF








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done


#########
# Figure out whether or not we have these functions
#
for ac_func in fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64
do :
  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
  cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
_ACEOF
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Changes to configure.ac.
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#########
# Check for needed/wanted headers
AC_CHECK_HEADERS([sys/types.h stdlib.h stdint.h inttypes.h malloc.h])

#########
# Figure out whether or not we have these functions
#
AC_CHECK_FUNCS([fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime])

#########
# By default, we use the amalgamation (this may be changed below...)
#
USE_AMALGAMATION=1

#########








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#########
# Check for needed/wanted headers
AC_CHECK_HEADERS([sys/types.h stdlib.h stdint.h inttypes.h malloc.h])

#########
# Figure out whether or not we have these functions
#
AC_CHECK_FUNCS([fdatasync gmtime_r isnan localtime_r localtime_s malloc_usable_size strchrnul usleep utime pread pread64 pwrite pwrite64])

#########
# By default, we use the amalgamation (this may be changed below...)
#
USE_AMALGAMATION=1

#########
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Changes to src/os_unix.c.
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#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 1
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif














/*
** standard include files.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>








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#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 1
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif

/* Use pread() and pwrite() if they are available */
#if defined(__APPLE__)
# define HAVE_PREAD 1
# define HAVE_PWRITE 1
#endif
#if defined(HAVE_PREAD64) && defined(HAVE_PWRITE64)
# undef USE_PREAD
# define USE_PREAD64 1
#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE)
# undef USE_PREAD64
# define USE_PREAD 1
#endif

/*
** standard include files.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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