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7a7ef429 PE |
1 | #serial 13 |
2 | dnl Copyright (C) 2002, 2005, 2007, 2009-2011 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 | AC_DEFUN([gl_FUNC_DUP2], | |
8 | [ | |
9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
10 | AC_REQUIRE([AC_CANONICAL_HOST]) | |
11 | m4_ifdef([gl_FUNC_DUP2_OBSOLETE], [ | |
12 | AC_CHECK_FUNCS_ONCE([dup2]) | |
13 | if test $ac_cv_func_dup2 = no; then | |
14 | HAVE_DUP2=0 | |
15 | AC_LIBOBJ([dup2]) | |
16 | fi | |
17 | ], [ | |
18 | AC_DEFINE([HAVE_DUP2], [1], [Define to 1 if you have the 'dup2' function.]) | |
19 | ]) | |
20 | if test $HAVE_DUP2 = 1; then | |
21 | AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works], | |
22 | [AC_RUN_IFELSE([ | |
23 | AC_LANG_PROGRAM([[#include <unistd.h> | |
24 | #include <fcntl.h> | |
25 | #include <errno.h>]], | |
26 | [int result = 0; | |
27 | #ifdef FD_CLOEXEC | |
28 | if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1) | |
29 | result |= 1; | |
30 | #endif | |
31 | if (dup2 (1, 1) == 0) | |
32 | result |= 2; | |
33 | #ifdef FD_CLOEXEC | |
34 | if (fcntl (1, F_GETFD) != FD_CLOEXEC) | |
35 | result |= 4; | |
36 | #endif | |
37 | close (0); | |
38 | if (dup2 (0, 0) != -1) | |
39 | result |= 8; | |
40 | /* Many gnulib modules require POSIX conformance of EBADF. */ | |
41 | if (dup2 (2, 1000000) == -1 && errno != EBADF) | |
42 | result |= 16; | |
43 | return result; | |
44 | ]) | |
45 | ], | |
46 | [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no], | |
47 | [case "$host_os" in | |
48 | mingw*) # on this platform, dup2 always returns 0 for success | |
49 | gl_cv_func_dup2_works=no;; | |
50 | cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0 | |
51 | gl_cv_func_dup2_works=no;; | |
52 | linux*) # On linux between 2008-07-27 and 2009-05-11, dup2 of a | |
53 | # closed fd may yield -EBADF instead of -1 / errno=EBADF. | |
54 | gl_cv_func_dup2_works=no;; | |
55 | freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF. | |
56 | gl_cv_func_dup2_works=no;; | |
57 | haiku*) # on Haiku alpha 2, dup2(1, 1) resets FD_CLOEXEC. | |
58 | gl_cv_func_dup2_works=no;; | |
59 | *) gl_cv_func_dup2_works=yes;; | |
60 | esac]) | |
61 | ]) | |
62 | if test "$gl_cv_func_dup2_works" = no; then | |
63 | gl_REPLACE_DUP2 | |
64 | fi | |
65 | fi | |
66 | ]) | |
67 | ||
68 | AC_DEFUN([gl_REPLACE_DUP2], | |
69 | [ | |
70 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
71 | AC_CHECK_FUNCS_ONCE([dup2]) | |
72 | if test $ac_cv_func_dup2 = yes; then | |
73 | REPLACE_DUP2=1 | |
74 | fi | |
75 | AC_LIBOBJ([dup2]) | |
76 | ]) |