version 1.1, 2012/05/29 09:29:42
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version 1.1.1.2, 2021/03/17 13:38:46
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# fcntl-o.m4 serial 1 | # fcntl-o.m4 serial 6 |
dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc. | dnl Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc. |
dnl This file is free software; the Free Software Foundation |
dnl This file is free software; the Free Software Foundation |
dnl gives unlimited permission to copy and/or distribute it, |
dnl gives unlimited permission to copy and/or distribute it, |
dnl with or without modifications, as long as this notice is preserved. |
dnl with or without modifications, as long as this notice is preserved. |
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dnl Written by Paul Eggert. |
dnl Written by Paul Eggert. |
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AC_PREREQ([2.60]) |
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# Test whether the flags O_NOATIME and O_NOFOLLOW actually work. |
# Test whether the flags O_NOATIME and O_NOFOLLOW actually work. |
# Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise. |
# Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise. |
# Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise. |
# Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise. |
Line 13 AC_DEFUN([gl_FCNTL_O_FLAGS],
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Line 15 AC_DEFUN([gl_FCNTL_O_FLAGS],
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[ |
[ |
dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. |
dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. |
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
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AC_CHECK_HEADERS_ONCE([unistd.h]) |
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AC_CHECK_FUNCS_ONCE([symlink]) |
AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], |
AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], |
[AC_RUN_IFELSE( |
[AC_RUN_IFELSE( |
[AC_LANG_PROGRAM( |
[AC_LANG_PROGRAM( |
[[#include <sys/types.h> |
[[#include <sys/types.h> |
#include <sys/stat.h> |
#include <sys/stat.h> |
#include <unistd.h> | #if HAVE_UNISTD_H |
| # include <unistd.h> |
| #else /* on Windows with MSVC */ |
| # include <io.h> |
| # include <stdlib.h> |
| # defined sleep(n) _sleep ((n) * 1000) |
| #endif |
#include <fcntl.h> |
#include <fcntl.h> |
#ifndef O_NOATIME |
#ifndef O_NOATIME |
#define O_NOATIME 0 |
#define O_NOATIME 0 |
Line 33 AC_DEFUN([gl_FCNTL_O_FLAGS],
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Line 45 AC_DEFUN([gl_FCNTL_O_FLAGS],
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}; |
}; |
]], |
]], |
[[ |
[[ |
int status = !constants; | int result = !constants; |
| #if HAVE_SYMLINK |
{ |
{ |
static char const sym[] = "conftest.sym"; |
static char const sym[] = "conftest.sym"; |
if (symlink (".", sym) != 0 | if (symlink ("/dev/null", sym) != 0) |
|| close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) | result |= 2; |
status |= 32; | else |
| { |
| int fd = open (sym, O_WRONLY | O_NOFOLLOW | O_CREAT, 0); |
| if (fd >= 0) |
| { |
| close (fd); |
| result |= 4; |
| } |
| } |
| if (unlink (sym) != 0 || symlink (".", sym) != 0) |
| result |= 2; |
| else |
| { |
| int fd = open (sym, O_RDONLY | O_NOFOLLOW); |
| if (fd >= 0) |
| { |
| close (fd); |
| result |= 4; |
| } |
| } |
unlink (sym); |
unlink (sym); |
} |
} |
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#endif |
{ |
{ |
static char const file[] = "confdefs.h"; |
static char const file[] = "confdefs.h"; |
int fd = open (file, O_RDONLY | O_NOATIME); |
int fd = open (file, O_RDONLY | O_NOATIME); |
char c; | if (fd < 0) |
struct stat st0, st1; | result |= 8; |
if (fd < 0 | else |
|| fstat (fd, &st0) != 0 | { |
|| sleep (1) != 0 | struct stat st0; |
|| read (fd, &c, 1) != 1 | if (fstat (fd, &st0) != 0) |
|| close (fd) != 0 | result |= 16; |
|| stat (file, &st1) != 0 | else |
|| st0.st_atime != st1.st_atime) | { |
status |= 64; | char c; |
| sleep (1); |
| if (read (fd, &c, 1) != 1) |
| result |= 24; |
| else |
| { |
| if (close (fd) != 0) |
| result |= 32; |
| else |
| { |
| struct stat st1; |
| if (stat (file, &st1) != 0) |
| result |= 40; |
| else |
| if (st0.st_atime != st1.st_atime) |
| result |= 64; |
| } |
| } |
| } |
| } |
} |
} |
return status;]])], | return result;]])], |
[gl_cv_header_working_fcntl_h=yes], |
[gl_cv_header_working_fcntl_h=yes], |
[case $? in #( |
[case $? in #( |
32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( | 4) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( |
64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( |
64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( |
96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( | 68) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( |
*) gl_cv_header_working_fcntl_h='no';; |
*) gl_cv_header_working_fcntl_h='no';; |
esac], |
esac], |
[gl_cv_header_working_fcntl_h=cross-compiling])]) | [case "$host_os" in |
| # Guess 'no' on native Windows. |
| mingw*) gl_cv_header_working_fcntl_h='no' ;; |
| *) gl_cv_header_working_fcntl_h=cross-compiling ;; |
| esac |
| ]) |
| ]) |
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case $gl_cv_header_working_fcntl_h in #( |
case $gl_cv_header_working_fcntl_h in #( |
*O_NOATIME* | no | cross-compiling) ac_val=0;; #( |
*O_NOATIME* | no | cross-compiling) ac_val=0;; #( |