1 # strerror_r.m4 serial 10
2 dnl Copyright (C) 2002, 2007-2011 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.
7 AC_DEFUN([gl_FUNC_STRERROR_R],
9 AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
11 dnl Persuade Solaris <string.h> to declare strerror_r().
12 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
16 AC_CHECK_DECLS_ONCE([strerror_r])
17 if test $ac_cv_have_decl_strerror_r = no; then
18 HAVE_DECL_STRERROR_R=0
21 if test $ac_cv_func_strerror_r = yes; then
22 if test -z "$ERRNO_H"; then
23 if test $gl_cv_func_strerror_r_posix_signature = yes; then
24 case "$gl_cv_func_strerror_r_works" in
25 dnl The system's strerror_r has bugs. Replace it.
26 *no) REPLACE_STRERROR_R=1 ;;
29 dnl The system's strerror() has a wrong signature. Replace it.
33 dnl The system's strerror_r() cannot know about the new errno values we
34 dnl add to <errno.h>. Replace it.
40 # Prerequisites of lib/strerror_r.c.
41 AC_DEFUN([gl_PREREQ_STRERROR_R], [
42 AC_CHECK_FUNCS_ONCE([catgets])
46 # Detect if strerror_r works, but without affecting whether a replacement
47 # strerror_r will be used.
48 AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
50 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
51 AC_REQUIRE([gl_HEADER_ERRNO_H])
52 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
54 AC_CHECK_FUNCS_ONCE([strerror_r])
55 if test $ac_cv_func_strerror_r = yes; then
56 if test -z "$ERRNO_H"; then
57 dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
58 dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
59 dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
60 AC_CACHE_CHECK([for strerror_r with POSIX signature],
61 [gl_cv_func_strerror_r_posix_signature],
65 int strerror_r (int, char *, size_t);
68 [gl_cv_func_strerror_r_posix_signature=yes],
69 [gl_cv_func_strerror_r_posix_signature=no])
71 if test $gl_cv_func_strerror_r_posix_signature = yes; then
72 dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
73 dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
75 dnl FreeBSD 8.s strerror_r claims failure on 0
76 dnl Solaris 10 strerror_r corrupts errno on failure
77 AC_CACHE_CHECK([whether strerror_r works],
78 [gl_cv_func_strerror_r_works],
86 if (strerror_r (EACCES, buf, 0) < 0)
89 if (strerror_r (EACCES, buf, sizeof buf) != 0)
91 if (strerror_r (0, buf, sizeof buf) != 0)
96 if (strerror_r (-3, buf, sizeof buf) != 0)
102 [gl_cv_func_strerror_r_works=yes],
103 [gl_cv_func_strerror_r_works=no],
108 aix*) gl_cv_func_strerror_r_works="guessing no";;
110 hpux*) gl_cv_func_strerror_r_works="guessing no";;
111 # Guess no on FreeBSD.
112 freebsd*) gl_cv_func_strerror_r_works="guessing no";;
113 # Guess yes otherwise.
114 *) gl_cv_func_strerror_r_works="guessing yes";;
120 dnl The system's strerror() has a wrong signature.
121 dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
122 AC_CHECK_FUNCS([__xpg_strerror_r])
123 dnl glibc < 2.14 does not populate buf on failure
124 dnl cygwin < 1.7.10 clobbers strerror
125 if test $ac_cv_func___xpg_strerror_r = yes; then
126 AC_CACHE_CHECK([whether strerror_r works],
127 [gl_cv_func_strerror_r_works],
132 extern int __xpg_strerror_r(int, char *, size_t);
137 char *str = strerror (-1);
139 if (__xpg_strerror_r (-2, buf, 1) == 0)
143 __xpg_strerror_r (-2, buf, 256);
144 if (strcmp (str, copy))
148 [gl_cv_func_strerror_r_works=yes],
149 [gl_cv_func_strerror_r_works=no],
150 [dnl guess no on all platforms that have __xpg_strerror_r,
151 dnl at least until fixed glibc and cygwin are more common
152 gl_cv_func_strerror_r_works="guessing no"