Annotation of embedaddon/libiconv/m4/fcntl-o.m4, revision 1.1.1.1
1.1 misho 1: # fcntl-o.m4 serial 1
2: dnl Copyright (C) 2006, 2009-2010 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: # 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.
15: AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
16: AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
17: [AC_RUN_IFELSE(
18: [AC_LANG_PROGRAM(
19: [[#include <sys/types.h>
20: #include <sys/stat.h>
21: #include <unistd.h>
22: #include <fcntl.h>
23: #ifndef O_NOATIME
24: #define O_NOATIME 0
25: #endif
26: #ifndef O_NOFOLLOW
27: #define O_NOFOLLOW 0
28: #endif
29: static int const constants[] =
30: {
31: O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
32: O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
33: };
34: ]],
35: [[
36: int status = !constants;
37: {
38: static char const sym[] = "conftest.sym";
39: if (symlink (".", sym) != 0
40: || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
41: status |= 32;
42: unlink (sym);
43: }
44: {
45: static char const file[] = "confdefs.h";
46: int fd = open (file, O_RDONLY | O_NOATIME);
47: char c;
48: struct stat st0, st1;
49: if (fd < 0
50: || fstat (fd, &st0) != 0
51: || sleep (1) != 0
52: || read (fd, &c, 1) != 1
53: || close (fd) != 0
54: || stat (file, &st1) != 0
55: || st0.st_atime != st1.st_atime)
56: status |= 64;
57: }
58: return status;]])],
59: [gl_cv_header_working_fcntl_h=yes],
60: [case $? in #(
61: 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
62: 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
63: 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
64: *) gl_cv_header_working_fcntl_h='no';;
65: esac],
66: [gl_cv_header_working_fcntl_h=cross-compiling])])
67:
68: case $gl_cv_header_working_fcntl_h in #(
69: *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
70: *) ac_val=1;;
71: esac
72: AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
73: [Define to 1 if O_NOATIME works.])
74:
75: case $gl_cv_header_working_fcntl_h in #(
76: *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
77: *) ac_val=1;;
78: esac
79: AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
80: [Define to 1 if O_NOFOLLOW works.])
81: ])
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>