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5abebf3c CB |
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. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_STRERROR_R], | |
8 | [ | |
9 | AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) | |
10 | AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS]) | |
11 | ||
12 | dnl Persuade Solaris <string.h> to declare strerror_r(). | |
13 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
14 | ||
15 | dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT | |
16 | dnl are not defined. | |
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.]) | |
21 | ||
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 ;; | |
28 | esac | |
29 | else | |
30 | dnl The system's strerror_r() has a wrong signature. Replace it. | |
31 | REPLACE_STRERROR_R=1 | |
32 | fi | |
33 | else | |
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. | |
36 | REPLACE_STRERROR_R=1 | |
37 | fi | |
38 | fi | |
39 | ||
40 | # Overwrite the findings of AC_FUNC_STRERROR_R (for code that uses that). | |
41 | AC_REQUIRE([AC_FUNC_STRERROR_R]) | |
42 | ]) | |
43 | ||
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 *.]) | |
53 | ]) | |
54 | ||
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]) | |
61 | ]) | |
62 | ||
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], | |
66 | [ | |
67 | AC_REQUIRE([gl_HEADER_ERRNO_H]) | |
68 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
69 | AC_REQUIRE([gl_FUNC_STRERROR_0]) | |
70 | ||
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], | |
79 | [AC_COMPILE_IFELSE( | |
80 | [AC_LANG_PROGRAM( | |
81 | [[#include <string.h> | |
82 | int strerror_r (int, char *, size_t); | |
83 | ]], | |
84 | [])], | |
85 | [gl_cv_func_strerror_r_posix_signature=yes], | |
86 | [gl_cv_func_strerror_r_posix_signature=no]) | |
87 | ]) | |
88 | if test $gl_cv_func_strerror_r_posix_signature = yes; then | |
89 | dnl AIX 6.1 strerror_r fails by returning -1, not an error number. | |
90 | dnl HP-UX 11.31 strerror_r always fails when the buffer length argument | |
91 | dnl is less than 80. | |
92 | dnl FreeBSD 8.s strerror_r claims failure on 0 | |
93 | dnl Mac OS X 10.5 strerror_r treats 0 like -1 | |
94 | dnl Solaris 10 strerror_r corrupts errno on failure | |
95 | AC_CACHE_CHECK([whether strerror_r works], | |
96 | [gl_cv_func_strerror_r_works], | |
97 | [AC_RUN_IFELSE( | |
98 | [AC_LANG_PROGRAM( | |
99 | [[#include <errno.h> | |
100 | #include <string.h> | |
101 | ]], | |
102 | [[int result = 0; | |
103 | char buf[79]; | |
104 | if (strerror_r (EACCES, buf, 0) < 0) | |
105 | result |= 1; | |
106 | errno = 0; | |
107 | if (strerror_r (EACCES, buf, sizeof buf) != 0) | |
108 | result |= 2; | |
109 | strcpy (buf, "Unknown"); | |
110 | if (strerror_r (0, buf, sizeof buf) != 0) | |
111 | result |= 4; | |
112 | if (errno) | |
113 | result |= 8; | |
114 | if (strstr (buf, "nknown") || strstr (buf, "ndefined")) | |
115 | result |= 0x10; | |
116 | errno = 0; | |
117 | *buf = 0; | |
118 | if (strerror_r (-3, buf, sizeof buf) < 0) | |
119 | result |= 0x20; | |
120 | if (errno) | |
121 | result |= 0x40; | |
122 | if (!*buf) | |
123 | result |= 0x80; | |
124 | return result; | |
125 | ]])], | |
126 | [gl_cv_func_strerror_r_works=yes], | |
127 | [gl_cv_func_strerror_r_works=no], | |
128 | [ | |
129 | changequote(,)dnl | |
130 | case "$host_os" in | |
131 | # Guess no on AIX. | |
132 | aix*) gl_cv_func_strerror_r_works="guessing no";; | |
133 | # Guess no on HP-UX. | |
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";; | |
139 | esac | |
140 | changequote([,])dnl | |
141 | ]) | |
142 | ]) | |
143 | else | |
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], | |
152 | [AC_RUN_IFELSE( | |
153 | [AC_LANG_PROGRAM( | |
154 | [[#include <errno.h> | |
155 | #include <string.h> | |
156 | extern | |
157 | #ifdef __cplusplus | |
158 | "C" | |
159 | #endif | |
160 | int __xpg_strerror_r(int, char *, size_t); | |
161 | ]], | |
162 | [[int result = 0; | |
163 | char buf[256] = "^"; | |
164 | char copy[256]; | |
165 | char *str = strerror (-1); | |
166 | strcpy (copy, str); | |
167 | if (__xpg_strerror_r (-2, buf, 1) == 0) | |
168 | result |= 1; | |
169 | if (*buf) | |
170 | result |= 2; | |
171 | __xpg_strerror_r (-2, buf, 256); | |
172 | if (strcmp (str, copy)) | |
173 | result |= 4; | |
174 | return result; | |
175 | ]])], | |
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" | |
181 | ]) | |
182 | ]) | |
183 | fi | |
184 | fi | |
185 | fi | |
186 | fi | |
187 | ]) |