1# open.m4 serial 14
2dnl Copyright (C) 2007-2012 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
7AC_DEFUN([gl_FUNC_OPEN],
8[
9  AC_REQUIRE([AC_CANONICAL_HOST])
10  case "$host_os" in
11    mingw* | pw*)
12      REPLACE_OPEN=1
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 $ac_cv_func_lstat = yes; then
22            touch conftest.tmp
23            ln -s conftest.tmp conftest.lnk
24          fi
25          AC_RUN_IFELSE(
26            [AC_LANG_SOURCE([[
27#include <fcntl.h>
28#if HAVE_UNISTD_H
29# include <unistd.h>
30#endif
31int main ()
32{
33  int result = 0;
34#if HAVE_LSTAT
35  if (open ("conftest.lnk/", O_RDONLY) != -1)
36    result |= 1;
37#endif
38  if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
39    result |= 2;
40  return result;
41}]])],
42            [gl_cv_func_open_slash=yes],
43            [gl_cv_func_open_slash=no],
44            [
45changequote(,)dnl
46             case "$host_os" in
47               freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
48                 gl_cv_func_open_slash="guessing no" ;;
49               *)
50                 gl_cv_func_open_slash="guessing yes" ;;
51             esac
52changequote([,])dnl
53            ])
54          rm -f conftest.sl conftest.tmp conftest.lnk
55        ])
56      case "$gl_cv_func_open_slash" in
57        *no)
58          AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
59            [Define to 1 if open() fails to recognize a trailing slash.])
60          REPLACE_OPEN=1
61          ;;
62      esac
63      ;;
64  esac
65  dnl Replace open() for supporting the gnulib-defined fchdir() function,
66  dnl to keep fchdir's bookkeeping up-to-date.
67  m4_ifdef([gl_FUNC_FCHDIR], [
68    if test $REPLACE_OPEN = 0; then
69      gl_TEST_FCHDIR
70      if test $HAVE_FCHDIR = 0; then
71        REPLACE_OPEN=1
72      fi
73    fi
74  ])
75  dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
76  m4_ifdef([gl_NONBLOCKING_IO], [
77    if test $REPLACE_OPEN = 0; then
78      gl_NONBLOCKING_IO
79      if test $gl_cv_have_open_O_NONBLOCK != yes; then
80        REPLACE_OPEN=1
81      fi
82    fi
83  ])
84])
85
86# Prerequisites of lib/open.c.
87AC_DEFUN([gl_PREREQ_OPEN],
88[
89  AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
90  :
91])
92