HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 9157d901 | 1 | # fcntl-o.m4 serial 2 |
| a927b6c1 | 2 | dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc. |
| 8912421c LC |
3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 6 | ||
| 7 | dnl Written by Paul Eggert. | |
| 8 | ||
| 8912421c LC |
9 | # Test whether the flags O_NOATIME and O_NOFOLLOW actually work. |
| 10 | # Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise. | |
| 11 | # Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise. | |
| 12 | AC_DEFUN([gl_FCNTL_O_FLAGS], | |
| 13 | [ | |
| 14 | dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. | |
| 9157d901 LC |
15 | dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes |
| 16 | dnl AC_GNU_SOURCE. | |
| 17 | m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], | |
| 18 | [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])], | |
| 19 | [AC_REQUIRE([AC_GNU_SOURCE])]) | |
| 8912421c LC |
20 | AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], |
| 21 | [AC_RUN_IFELSE( | |
| 22 | [AC_LANG_PROGRAM( | |
| 1cd4fffc LC |
23 | [[#include <sys/types.h> |
| 24 | #include <sys/stat.h> | |
| 25 | #include <unistd.h> | |
| 26 | #include <fcntl.h> | |
| 27 | #ifndef O_NOATIME | |
| 28 | #define O_NOATIME 0 | |
| 29 | #endif | |
| 30 | #ifndef O_NOFOLLOW | |
| 31 | #define O_NOFOLLOW 0 | |
| 32 | #endif | |
| 33 | static int const constants[] = | |
| 34 | { | |
| 35 | O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, | |
| 36 | O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY | |
| 37 | }; | |
| 38 | ]], | |
| 39 | [[ | |
| 40 | int status = !constants; | |
| 41 | { | |
| 42 | static char const sym[] = "conftest.sym"; | |
| 43 | if (symlink (".", sym) != 0 | |
| 44 | || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) | |
| 45 | status |= 32; | |
| 46 | unlink (sym); | |
| 47 | } | |
| 48 | { | |
| 49 | static char const file[] = "confdefs.h"; | |
| 50 | int fd = open (file, O_RDONLY | O_NOATIME); | |
| 51 | char c; | |
| 52 | struct stat st0, st1; | |
| 53 | if (fd < 0 | |
| 54 | || fstat (fd, &st0) != 0 | |
| 55 | || sleep (1) != 0 | |
| 56 | || read (fd, &c, 1) != 1 | |
| 57 | || close (fd) != 0 | |
| 58 | || stat (file, &st1) != 0 | |
| 59 | || st0.st_atime != st1.st_atime) | |
| 60 | status |= 64; | |
| 61 | } | |
| 62 | return status;]])], | |
| 8912421c LC |
63 | [gl_cv_header_working_fcntl_h=yes], |
| 64 | [case $? in #( | |
| 1cd4fffc LC |
65 | 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( |
| 66 | 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( | |
| 67 | 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( | |
| 68 | *) gl_cv_header_working_fcntl_h='no';; | |
| 69 | esac], | |
| 8912421c LC |
70 | [gl_cv_header_working_fcntl_h=cross-compiling])]) |
| 71 | ||
| 72 | case $gl_cv_header_working_fcntl_h in #( | |
| 73 | *O_NOATIME* | no | cross-compiling) ac_val=0;; #( | |
| 74 | *) ac_val=1;; | |
| 75 | esac | |
| 76 | AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], | |
| 77 | [Define to 1 if O_NOATIME works.]) | |
| 78 | ||
| 79 | case $gl_cv_header_working_fcntl_h in #( | |
| 80 | *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( | |
| 81 | *) ac_val=1;; | |
| 82 | esac | |
| 83 | AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], | |
| 84 | [Define to 1 if O_NOFOLLOW works.]) | |
| 85 | ]) |