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c0c3707f | 1 | # strerror_r.m4 serial 20 |
5df4cba6 | 2 | dnl Copyright (C) 2002, 2007-2020 Free Software Foundation, Inc. |
5abebf3c CB |
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. | |
c0c3707f CB |
17 | AC_CHECK_DECLS_ONCE([strerror_r]) |
18 | if test $ac_cv_have_decl_strerror_r = no; then | |
19 | HAVE_DECL_STRERROR_R=0 | |
20 | fi | |
5abebf3c CB |
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 | |
5abebf3c CB |
39 | ]) |
40 | ||
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_ONCE([__xpg_strerror_r]) | |
45 | AC_CHECK_FUNCS_ONCE([catgets]) | |
46 | AC_CHECK_FUNCS_ONCE([snprintf]) | |
47 | ]) | |
48 | ||
49 | # Detect if strerror_r works, but without affecting whether a replacement | |
50 | # strerror_r will be used. | |
51 | AC_DEFUN([gl_FUNC_STRERROR_R_WORKS], | |
52 | [ | |
53 | AC_REQUIRE([gl_HEADER_ERRNO_H]) | |
54 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
55 | AC_REQUIRE([gl_FUNC_STRERROR_0]) | |
56 | ||
c0c3707f | 57 | AC_CHECK_FUNCS_ONCE([strerror_r]) |
5abebf3c CB |
58 | if test $ac_cv_func_strerror_r = yes; then |
59 | if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then | |
60 | dnl The POSIX prototype is: int strerror_r (int, char *, size_t); | |
61 | dnl glibc, Cygwin: char *strerror_r (int, char *, size_t); | |
62 | dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int); | |
63 | AC_CACHE_CHECK([for strerror_r with POSIX signature], | |
64 | [gl_cv_func_strerror_r_posix_signature], | |
65 | [AC_COMPILE_IFELSE( | |
66 | [AC_LANG_PROGRAM( | |
67 | [[#include <string.h> | |
68 | int strerror_r (int, char *, size_t); | |
69 | ]], | |
70 | [])], | |
71 | [gl_cv_func_strerror_r_posix_signature=yes], | |
72 | [gl_cv_func_strerror_r_posix_signature=no]) | |
73 | ]) | |
74 | if test $gl_cv_func_strerror_r_posix_signature = yes; then | |
75 | dnl AIX 6.1 strerror_r fails by returning -1, not an error number. | |
76 | dnl HP-UX 11.31 strerror_r always fails when the buffer length argument | |
77 | dnl is less than 80. | |
78 | dnl FreeBSD 8.s strerror_r claims failure on 0 | |
79 | dnl Mac OS X 10.5 strerror_r treats 0 like -1 | |
80 | dnl Solaris 10 strerror_r corrupts errno on failure | |
81 | AC_CACHE_CHECK([whether strerror_r works], | |
82 | [gl_cv_func_strerror_r_works], | |
83 | [AC_RUN_IFELSE( | |
84 | [AC_LANG_PROGRAM( | |
85 | [[#include <errno.h> | |
86 | #include <string.h> | |
87 | ]], | |
88 | [[int result = 0; | |
89 | char buf[79]; | |
90 | if (strerror_r (EACCES, buf, 0) < 0) | |
91 | result |= 1; | |
92 | errno = 0; | |
93 | if (strerror_r (EACCES, buf, sizeof buf) != 0) | |
94 | result |= 2; | |
95 | strcpy (buf, "Unknown"); | |
96 | if (strerror_r (0, buf, sizeof buf) != 0) | |
97 | result |= 4; | |
98 | if (errno) | |
99 | result |= 8; | |
100 | if (strstr (buf, "nknown") || strstr (buf, "ndefined")) | |
101 | result |= 0x10; | |
102 | errno = 0; | |
103 | *buf = 0; | |
104 | if (strerror_r (-3, buf, sizeof buf) < 0) | |
105 | result |= 0x20; | |
106 | if (errno) | |
107 | result |= 0x40; | |
108 | if (!*buf) | |
109 | result |= 0x80; | |
110 | return result; | |
111 | ]])], | |
112 | [gl_cv_func_strerror_r_works=yes], | |
113 | [gl_cv_func_strerror_r_works=no], | |
114 | [ | |
115 | changequote(,)dnl | |
116 | case "$host_os" in | |
117 | # Guess no on AIX. | |
118 | aix*) gl_cv_func_strerror_r_works="guessing no";; | |
119 | # Guess no on HP-UX. | |
120 | hpux*) gl_cv_func_strerror_r_works="guessing no";; | |
121 | # Guess no on BSD variants. | |
122 | *bsd*) gl_cv_func_strerror_r_works="guessing no";; | |
123 | # Guess yes otherwise. | |
124 | *) gl_cv_func_strerror_r_works="guessing yes";; | |
125 | esac | |
126 | changequote([,])dnl | |
127 | ]) | |
128 | ]) | |
129 | else | |
130 | dnl The system's strerror() has a wrong signature. | |
131 | dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r. | |
132 | AC_CHECK_FUNCS_ONCE([__xpg_strerror_r]) | |
133 | dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure. | |
134 | dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer. | |
135 | if test $ac_cv_func___xpg_strerror_r = yes; then | |
136 | AC_CACHE_CHECK([whether __xpg_strerror_r works], | |
137 | [gl_cv_func_strerror_r_works], | |
138 | [AC_RUN_IFELSE( | |
139 | [AC_LANG_PROGRAM( | |
140 | [[#include <errno.h> | |
141 | #include <string.h> | |
142 | extern | |
143 | #ifdef __cplusplus | |
144 | "C" | |
145 | #endif | |
146 | int __xpg_strerror_r(int, char *, size_t); | |
147 | ]], | |
148 | [[int result = 0; | |
149 | char buf[256] = "^"; | |
150 | char copy[256]; | |
151 | char *str = strerror (-1); | |
152 | strcpy (copy, str); | |
153 | if (__xpg_strerror_r (-2, buf, 1) == 0) | |
154 | result |= 1; | |
155 | if (*buf) | |
156 | result |= 2; | |
157 | __xpg_strerror_r (-2, buf, 256); | |
158 | if (strcmp (str, copy)) | |
159 | result |= 4; | |
160 | return result; | |
161 | ]])], | |
162 | [gl_cv_func_strerror_r_works=yes], | |
163 | [gl_cv_func_strerror_r_works=no], | |
164 | [dnl Guess no on all platforms that have __xpg_strerror_r, | |
165 | dnl at least until fixed glibc and cygwin are more common. | |
c0c3707f | 166 | gl_cv_func_strerror_r_works="$gl_cross_guess_normal" |
5abebf3c CB |
167 | ]) |
168 | ]) | |
169 | fi | |
170 | fi | |
171 | fi | |
172 | fi | |
173 | ]) |