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Filename :
fcntl-o.m4
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# fcntl-o.m4 serial 1 dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl Written by Paul Eggert. # 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_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise. AC_DEFUN([gl_FCNTL_O_FLAGS], [ dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <fcntl.h> #ifndef O_NOATIME #define O_NOATIME 0 #endif #ifndef O_NOFOLLOW #define O_NOFOLLOW 0 #endif static int const constants[] = { O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY }; ]], [[ int status = !constants; { static char const sym[] = "conftest.sym"; if (symlink (".", sym) != 0 || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) status |= 32; unlink (sym); } { static char const file[] = "confdefs.h"; int fd = open (file, O_RDONLY | O_NOATIME); char c; struct stat st0, st1; if (fd < 0 || fstat (fd, &st0) != 0 || sleep (1) != 0 || read (fd, &c, 1) != 1 || close (fd) != 0 || stat (file, &st1) != 0 || st0.st_atime != st1.st_atime) status |= 64; } return status;]])], [gl_cv_header_working_fcntl_h=yes], [case $? in #( 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( *) gl_cv_header_working_fcntl_h='no';; esac], [gl_cv_header_working_fcntl_h=cross-compiling])]) case $gl_cv_header_working_fcntl_h in #( *O_NOATIME* | no | cross-compiling) ac_val=0;; #( *) ac_val=1;; esac AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], [Define to 1 if O_NOATIME works.]) case $gl_cv_header_working_fcntl_h in #( *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( *) ac_val=1;; esac AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], [Define to 1 if O_NOFOLLOW works.]) ])