1 # strerror_r.m4 serial 11
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_HEADER_STRING_H_DEFAULTS])
10 AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
12 dnl Persuade Solaris <string.h> to declare strerror_r().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
17 AC_CHECK_DECLS_ONCE([strerror_r])
18 if test $ac_cv_have_decl_strerror_r = no; then
19 HAVE_DECL_STRERROR_R=0
22 if test $ac_cv_func_strerror_r = yes; then
23 if test -z "$ERRNO_H"; then
24 if test $gl_cv_func_strerror_r_posix_signature = yes; then
25 case "$gl_cv_func_strerror_r_works" in
26 dnl The system's strerror_r has bugs. Replace it.
27 *no) REPLACE_STRERROR_R=1 ;;
30 dnl The system's strerror_r() has a wrong signature. Replace it.
34 dnl The system's strerror_r() cannot know about the new errno values we
35 dnl add to <errno.h>. Replace it.
41 # Prerequisites of lib/strerror_r.c.
42 AC_DEFUN([gl_PREREQ_STRERROR_R], [
43 dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
44 AC_CHECK_FUNCS([__xpg_strerror_r])
45 AC_CHECK_FUNCS_ONCE([catgets])
48 # Detect if strerror_r works, but without affecting whether a replacement
49 # strerror_r will be used.
50 AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
52 AC_REQUIRE([gl_HEADER_ERRNO_H])
53 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
55 AC_CHECK_FUNCS_ONCE([strerror_r])
56 if test $ac_cv_func_strerror_r = yes; then
57 if test -z "$ERRNO_H"; then
58 dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
59 dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
60 dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
61 AC_CACHE_CHECK([for strerror_r with POSIX signature],
62 [gl_cv_func_strerror_r_posix_signature],
66 int strerror_r (int, char *, size_t);
69 [gl_cv_func_strerror_r_posix_signature=yes],
70 [gl_cv_func_strerror_r_posix_signature=no])
72 if test $gl_cv_func_strerror_r_posix_signature = yes; then
73 dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
74 dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
76 dnl FreeBSD 8.s strerror_r claims failure on 0
77 dnl MacOS X 10.5 strerror_r treats 0 like -1
78 dnl Solaris 10 strerror_r corrupts errno on failure
79 AC_CACHE_CHECK([whether strerror_r works],
80 [gl_cv_func_strerror_r_works],
88 if (strerror_r (EACCES, buf, 0) < 0)
91 if (strerror_r (EACCES, buf, sizeof buf) != 0)
93 strcpy (buf, "Unknown");
94 if (strerror_r (0, buf, sizeof buf) != 0)
98 if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
102 if (strerror_r (-3, buf, sizeof buf) < 0)
110 [gl_cv_func_strerror_r_works=yes],
111 [gl_cv_func_strerror_r_works=no],
116 aix*) gl_cv_func_strerror_r_works="guessing no";;
118 hpux*) gl_cv_func_strerror_r_works="guessing no";;
119 # Guess no on FreeBSD.
120 freebsd*) gl_cv_func_strerror_r_works="guessing no";;
121 # Guess yes otherwise.
122 *) gl_cv_func_strerror_r_works="guessing yes";;
128 dnl The system's strerror() has a wrong signature.
129 dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
130 AC_CHECK_FUNCS([__xpg_strerror_r])
131 dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure.
132 dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer.
133 if test $ac_cv_func___xpg_strerror_r = yes; then
134 AC_CACHE_CHECK([whether __xpg_strerror_r works],
135 [gl_cv_func_strerror_r_works],
140 extern int __xpg_strerror_r(int, char *, size_t);
145 char *str = strerror (-1);
147 if (__xpg_strerror_r (-2, buf, 1) == 0)
151 __xpg_strerror_r (-2, buf, 256);
152 if (strcmp (str, copy))
156 [gl_cv_func_strerror_r_works=yes],
157 [gl_cv_func_strerror_r_works=no],
158 [dnl Guess no on all platforms that have __xpg_strerror_r,
159 dnl at least until fixed glibc and cygwin are more common.
160 gl_cv_func_strerror_r_works="guessing no"