diff options
Diffstat (limited to 'gl/m4/fcntl_h.m4')
-rw-r--r-- | gl/m4/fcntl_h.m4 | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/gl/m4/fcntl_h.m4 b/gl/m4/fcntl_h.m4 new file mode 100644 index 00000000..4a7fc42b --- /dev/null +++ b/gl/m4/fcntl_h.m4 | |||
@@ -0,0 +1,94 @@ | |||
1 | # Configure fcntl.h. | ||
2 | dnl Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc. | ||
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 | |||
9 | AC_DEFUN([gl_FCNTL_H], | ||
10 | [ | ||
11 | AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) | ||
12 | AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], | ||
13 | [AC_RUN_IFELSE( | ||
14 | [AC_LANG_PROGRAM( | ||
15 | [[#include <sys/types.h> | ||
16 | #include <sys/stat.h> | ||
17 | #include <unistd.h> | ||
18 | #include <fcntl.h> | ||
19 | #ifndef O_NOATIME | ||
20 | #define O_NOATIME 0 | ||
21 | #endif | ||
22 | #ifndef O_NOFOLLOW | ||
23 | #define O_NOFOLLOW 0 | ||
24 | #endif | ||
25 | static int const constants[] = | ||
26 | { | ||
27 | O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, | ||
28 | O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY | ||
29 | }; | ||
30 | ]], | ||
31 | [[ | ||
32 | int status = !constants; | ||
33 | { | ||
34 | static char const sym[] = "conftest.sym"; | ||
35 | if (symlink (".", sym) != 0 | ||
36 | || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) | ||
37 | status |= 32; | ||
38 | } | ||
39 | { | ||
40 | static char const file[] = "confdefs.h"; | ||
41 | int fd = open (file, O_RDONLY | O_NOATIME); | ||
42 | char c; | ||
43 | struct stat st0, st1; | ||
44 | if (fd < 0 | ||
45 | || fstat (fd, &st0) != 0 | ||
46 | || sleep (1) != 0 | ||
47 | || read (fd, &c, 1) != 1 | ||
48 | || close (fd) != 0 | ||
49 | || stat (file, &st1) != 0 | ||
50 | || st0.st_atime != st1.st_atime) | ||
51 | status |= 64; | ||
52 | } | ||
53 | return status;]])], | ||
54 | [gl_cv_header_working_fcntl_h=yes], | ||
55 | [case $? in #( | ||
56 | 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( | ||
57 | 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( | ||
58 | 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( | ||
59 | *) gl_cv_header_working_fcntl_h='no';; | ||
60 | esac], | ||
61 | [gl_cv_header_working_fcntl_h=cross-compiling])]) | ||
62 | |||
63 | case $gl_cv_header_working_fcntl_h in #( | ||
64 | *O_NOATIME* | no | cross-compiling) ac_val=0;; #( | ||
65 | *) ac_val=1;; | ||
66 | esac | ||
67 | AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], | ||
68 | [Define to 1 if O_NOATIME works.]) | ||
69 | |||
70 | case $gl_cv_header_working_fcntl_h in #( | ||
71 | *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( | ||
72 | *) ac_val=1;; | ||
73 | esac | ||
74 | AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], | ||
75 | [Define to 1 if O_NOFOLLOW works.]) | ||
76 | |||
77 | gl_CHECK_NEXT_HEADERS([fcntl.h]) | ||
78 | FCNTL_H='fcntl.h' | ||
79 | AC_SUBST([FCNTL_H]) | ||
80 | ]) | ||
81 | |||
82 | AC_DEFUN([gl_FCNTL_MODULE_INDICATOR], | ||
83 | [ | ||
84 | dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | ||
85 | AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) | ||
86 | GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1 | ||
87 | ]) | ||
88 | |||
89 | AC_DEFUN([gl_FCNTL_H_DEFAULTS], | ||
90 | [ | ||
91 | GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN]) | ||
92 | dnl Assume proper GNU behavior unless another module says otherwise. | ||
93 | REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN]) | ||
94 | ]) | ||