1 # strerror_r.m4 serial 18
2 dnl Copyright (C) 2002, 2007-2016 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_DECL([strerror_r],
18 [HAVE_DECL_STRERROR_R=1], [HAVE_DECL_STRERROR_R=0])
19 AC_DEFINE_UNQUOTED([HAVE_DECL_STRERROR_R_ORIG], [$HAVE_DECL_STRERROR_R],
20 [Define to 1 if you have the declaration of 'strerror_r' in the system include files, or to 0 otherwise.])
22 if test $ac_cv_func_strerror_r = yes; then
23 if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; 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>, or any fix for strerror(0). Replace it.
40 # Overwrite the findings of AC_FUNC_STRERROR_R (for code that uses that).
41 AC_REQUIRE([AC_FUNC_STRERROR_R])
44 # If this module is in use, we unconditionally want POSIX semantics; so
45 # replace autoconf's macro with a version that does not probe
46 AC_DEFUN([AC_FUNC_STRERROR_R], [
47 AC_DEFINE([HAVE_DECL_STRERROR_R], [1],
48 [Define to 1, since you should have the declaration of strerror_r.])
49 AC_DEFINE([HAVE_STRERROR_R], [1],
50 [Define to 1, since you should have the function strerror_r.])
51 AC_DEFINE([STRERROR_R_CHAR_P], [0],
52 [Define to 0, since strerror_r should not return char *.])
55 # Prerequisites of lib/strerror_r.c.
56 AC_DEFUN([gl_PREREQ_STRERROR_R], [
57 dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
58 AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
59 AC_CHECK_FUNCS_ONCE([catgets])
60 AC_CHECK_FUNCS_ONCE([snprintf])
63 # Detect if strerror_r works, but without affecting whether a replacement
64 # strerror_r will be used.
65 AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
67 AC_REQUIRE([gl_HEADER_ERRNO_H])
68 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
69 AC_REQUIRE([gl_FUNC_STRERROR_0])
71 AC_CHECK_FUNC([strerror_r])
72 if test $ac_cv_func_strerror_r = yes; then
73 if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
74 dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
75 dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
76 dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
77 AC_CACHE_CHECK([for strerror_r with POSIX signature],
78 [gl_cv_func_strerror_r_posix_signature],
82 int strerror_r (int, char *, size_t);
85 [gl_cv_func_strerror_r_posix_signature=yes],
86 [gl_cv_func_strerror_r_posix_signature=no])
88 if test $gl_cv_func_strerror_r_posix_signature = yes; then
89 dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
90 dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
92 dnl FreeBSD 8.s strerror_r claims failure on 0
93 dnl Mac OS X 10.5 strerror_r treats 0 like -1
94 dnl Solaris 10 strerror_r corrupts errno on failure
95 AC_CACHE_CHECK([whether strerror_r works],
96 [gl_cv_func_strerror_r_works],
104 if (strerror_r (EACCES, buf, 0) < 0)
107 if (strerror_r (EACCES, buf, sizeof buf) != 0)
109 strcpy (buf, "Unknown");
110 if (strerror_r (0, buf, sizeof buf) != 0)
114 if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
118 if (strerror_r (-3, buf, sizeof buf) < 0)
126 [gl_cv_func_strerror_r_works=yes],
127 [gl_cv_func_strerror_r_works=no],
132 aix*) gl_cv_func_strerror_r_works="guessing no";;
134 hpux*) gl_cv_func_strerror_r_works="guessing no";;
135 # Guess no on BSD variants.
136 *bsd*) gl_cv_func_strerror_r_works="guessing no";;
137 # Guess yes otherwise.
138 *) gl_cv_func_strerror_r_works="guessing yes";;
144 dnl The system's strerror() has a wrong signature.
145 dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
146 AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
147 dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure.
148 dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer.
149 if test $ac_cv_func___xpg_strerror_r = yes; then
150 AC_CACHE_CHECK([whether __xpg_strerror_r works],
151 [gl_cv_func_strerror_r_works],
160 int __xpg_strerror_r(int, char *, size_t);
165 char *str = strerror (-1);
167 if (__xpg_strerror_r (-2, buf, 1) == 0)
171 __xpg_strerror_r (-2, buf, 256);
172 if (strcmp (str, copy))
176 [gl_cv_func_strerror_r_works=yes],
177 [gl_cv_func_strerror_r_works=no],
178 [dnl Guess no on all platforms that have __xpg_strerror_r,
179 dnl at least until fixed glibc and cygwin are more common.
180 gl_cv_func_strerror_r_works="guessing no"