1 # open.m4 serial 8
2 dnl Copyright (C) 2007-2010 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.
7 AC_DEFUN([gl_FUNC_OPEN],
8 [
9 AC_REQUIRE([AC_CANONICAL_HOST])
10 case "$host_os" in
11 mingw* | pw*)
12 gl_REPLACE_OPEN
13 ;;
14 *)
15 dnl open("foo/") should not create a file when the file name has a
16 dnl trailing slash. FreeBSD only has the problem on symlinks.
17 AC_CHECK_FUNCS_ONCE([lstat])
18 AC_CACHE_CHECK([whether open recognizes a trailing slash],
19 [gl_cv_func_open_slash],
20 [# Assume that if we have lstat, we can also check symlinks.
21 if test $ac_cv_func_lstat = yes; then
22 touch conftest.tmp
23 ln -s conftest.tmp conftest.lnk
24 fi
25 AC_TRY_RUN([
26 #include <fcntl.h>
27 #if HAVE_UNISTD_H
28 # include <unistd.h>
29 #endif
30 int main ()
31 {
32 #if HAVE_LSTAT
33 if (open ("conftest.lnk/", O_RDONLY) != -1) return 2;
34 #endif
35 return open ("conftest.sl/", O_CREAT, 0600) >= 0;
36 }], [gl_cv_func_open_slash=yes], [gl_cv_func_open_slash=no],
37 [
38 changequote(,)dnl
39 case "$host_os" in
40 freebsd*) gl_cv_func_open_slash="guessing no" ;;
41 solaris2.[0-9]*) gl_cv_func_open_slash="guessing no" ;;
42 hpux*) gl_cv_func_open_slash="guessing no" ;;
43 *) gl_cv_func_open_slash="guessing yes" ;;
44 esac
45 changequote([,])dnl
46 ])
47 rm -f conftest.sl conftest.tmp conftest.lnk
48 ])
49 case "$gl_cv_func_open_slash" in
50 *no)
51 AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
52 [Define to 1 if open() fails to recognize a trailing slash.])
53 gl_REPLACE_OPEN
54 ;;
55 esac
56 ;;
57 esac
58 ])
60 AC_DEFUN([gl_REPLACE_OPEN],
61 [
62 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
63 REPLACE_OPEN=1
64 AC_LIBOBJ([open])
65 gl_PREREQ_OPEN
66 ])
68 # Prerequisites of lib/open.c.
69 AC_DEFUN([gl_PREREQ_OPEN],
70 [
71 AC_REQUIRE([AC_C_INLINE])
72 AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
73 :
74 ])