1# Configure fcntl.h. 2dnl Copyright (C) 2006 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl Written by Paul Eggert. 8 9AC_DEFUN([gl_FCNTL_H], 10[ 11 AC_CACHE_CHECK([for working fcntl.h], gl_cv_header_working_fcntl_h, 12 [AC_RUN_IFELSE( 13 [AC_LANG_PROGRAM( 14 [[#include <sys/types.h> 15 #include <sys/stat.h> 16 #include <unistd.h> 17 #include <fcntl.h> 18 #ifndef O_NOATIME 19 #define O_NOATIME 0 20 #endif 21 #ifndef O_NOFOLLOW 22 #define O_NOFOLLOW 0 23 #endif 24 static int const constants[] = 25 { 26 O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, 27 O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY 28 }; 29 ]], 30 [[ 31 int status = !constants; 32 { 33 static char const sym[] = "conftest.sym"; 34 if (symlink (".", sym) != 0 35 || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) 36 status |= 32; 37 } 38 { 39 static char const file[] = "confdefs.h"; 40 int fd = open (file, O_RDONLY | O_NOATIME); 41 char c; 42 struct stat st0, st1; 43 if (fd < 0 44 || fstat (fd, &st0) != 0 45 || sleep (1) != 0 46 || read (fd, &c, 1) != 1 47 || close (fd) != 0 48 || stat (file, &st1) != 0 49 || st0.st_atime != st1.st_atime) 50 status |= 64; 51 } 52 return status;]])], 53 [gl_cv_header_working_fcntl_h=yes], 54 [case $? in #( 55 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( 56 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( 57 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( 58 *) gl_cv_header_working_fcntl_h='no';; 59 esac], 60 [gl_cv_header_working_fcntl_h=cross-compiling])]) 61 62 case $gl_cv_header_working_fcntl_h in #( 63 *O_NOATIME* | no | cross-compiling) ac_val=0;; #( 64 *) ac_val=1;; 65 esac 66 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], 67 [Define to 1 if O_NOATIME works.]) 68 69 case $gl_cv_header_working_fcntl_h in #( 70 *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( 71 *) ac_val=1;; 72 esac 73 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], 74 [Define to 1 if O_NOFOLLOW works.]) 75 76 gl_ABSOLUTE_HEADER([fcntl.h]) 77 ABSOLUTE_FCNTL_H=\"$gl_cv_absolute_fcntl_h\" 78 AC_SUBST([ABSOLUTE_FCNTL_H]) 79 FCNTL_H='fcntl.h' 80 AC_SUBST([FCNTL_H]) 81]) 82