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-rw-r--r--gl/m4/fcntl.m483
1 files changed, 0 insertions, 83 deletions
diff --git a/gl/m4/fcntl.m4 b/gl/m4/fcntl.m4
deleted file mode 100644
index fcb5f447..00000000
--- a/gl/m4/fcntl.m4
+++ /dev/null
@@ -1,83 +0,0 @@
1# fcntl.m4 serial 3
2dnl Copyright (C) 2009, 2010 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
7# For now, this module ensures that fcntl()
8# - supports F_DUPFD correctly
9# - supports or emulates F_DUPFD_CLOEXEC
10# - supports F_GETFD
11# Still to be ported to mingw:
12# - F_SETFD
13# - F_GETFL, F_SETFL
14# - F_GETOWN, F_SETOWN
15# - F_GETLK, F_SETLK, F_SETLKW
16AC_DEFUN([gl_FUNC_FCNTL],
17[
18 dnl Persuade glibc to expose F_DUPFD_CLOEXEC.
19 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
20 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
21 AC_REQUIRE([AC_CANONICAL_HOST])
22 AC_CHECK_FUNCS_ONCE([fcntl])
23 if test $ac_cv_func_fcntl = no; then
24 gl_REPLACE_FCNTL
25 else
26 dnl cygwin 1.5.x F_DUPFD has wrong errno, and allows negative target
27 AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly],
28 [gl_cv_func_fcntl_f_dupfd_works],
29 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
30#include <fcntl.h>
31]], [[return fcntl (0, F_DUPFD, -1) != -1;
32 ]])],
33 [gl_cv_func_fcntl_f_dupfd_works=yes],
34 [gl_cv_func_fcntl_f_dupfd_works=no],
35 [# Guess that it works on glibc systems
36 case $host_os in #((
37 *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";;
38 *) gl_cv_func_fcntl_f_dupfd_works="guessing no";;
39 esac])])
40 case $gl_cv_func_fcntl_f_dupfd_works in
41 *yes) ;;
42 *) gl_REPLACE_FCNTL
43 AC_DEFINE([FCNTL_DUPFD_BUGGY], [1], [Define this to 1 if F_DUPFD
44 behavior does not match POSIX]) ;;
45 esac
46
47 dnl Many systems lack F_DUPFD_CLOEXEC
48 AC_CACHE_CHECK([whether fcntl understands F_DUPFD_CLOEXEC],
49 [gl_cv_func_fcntl_f_dupfd_cloexec],
50 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
51#include <fcntl.h>
52#ifndef F_DUPFD_CLOEXEC
53choke me
54#endif
55 ]])],
56 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
57#ifdef __linux__
58/* The Linux kernel only added F_DUPFD_CLOEXEC in 2.6.24, so we always replace
59 it to support the semantics on older kernels that failed with EINVAL. */
60choke me
61#endif
62 ]])],
63 [gl_cv_func_fcntl_f_dupfd_cloexec=yes],
64 [gl_cv_func_fcntl_f_dupfd_cloexec="needs runtime check"])],
65 [gl_cv_func_fcntl_f_dupfd_cloexec=no])])
66 if test "$gl_cv_func_fcntl_f_dupfd_cloexec" != yes; then
67 gl_REPLACE_FCNTL
68 dnl No witness macro needed for this bug.
69 fi
70 fi
71])
72
73AC_DEFUN([gl_REPLACE_FCNTL],
74[
75 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
76 AC_CHECK_FUNCS_ONCE([fcntl])
77 if test $ac_cv_func_fcntl = no; then
78 HAVE_FCNTL=0
79 else
80 REPLACE_FCNTL=1
81 fi
82 AC_LIBOBJ([fcntl])
83])