| 1 | # strerror_r.m4 serial 21
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| 2 | dnl Copyright (C) 2002, 2007-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN([gl_FUNC_STRERROR_R],
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| 8 | [
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| 9 | AC_REQUIRE([gl_STRING_H_DEFAULTS])
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| 10 | AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
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| 11 |
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| 12 | dnl Persuade Solaris <string.h> to declare strerror_r().
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| 13 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 14 |
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| 15 | dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
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| 16 | dnl are not defined.
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| 17 | AC_CHECK_DECLS_ONCE([strerror_r])
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| 18 | if test $ac_cv_have_decl_strerror_r = no; then
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| 19 | HAVE_DECL_STRERROR_R=0
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| 20 | fi
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| 21 |
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| 22 | if test $ac_cv_func_strerror_r = yes; then
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| 23 | if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
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| 24 | if test $gl_cv_func_strerror_r_posix_signature = yes; then
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| 25 | case "$gl_cv_func_strerror_r_works" in
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| 26 | dnl The system's strerror_r has bugs. Replace it.
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| 27 | *no) REPLACE_STRERROR_R=1 ;;
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| 28 | esac
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| 29 | else
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| 30 | dnl The system's strerror_r() has a wrong signature. Replace it.
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| 31 | REPLACE_STRERROR_R=1
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| 32 | fi
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| 33 | else
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| 34 | dnl The system's strerror_r() cannot know about the new errno values we
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| 35 | dnl add to <errno.h>, or any fix for strerror(0). Replace it.
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| 36 | REPLACE_STRERROR_R=1
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| 37 | fi
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| 38 | fi
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| 39 | ])
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| 40 |
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| 41 | # Prerequisites of lib/strerror_r.c.
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| 42 | AC_DEFUN([gl_PREREQ_STRERROR_R], [
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| 43 | dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
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| 44 | AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
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| 45 | AC_CHECK_FUNCS_ONCE([catgets])
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| 46 | AC_CHECK_FUNCS_ONCE([snprintf])
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| 47 | ])
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| 48 |
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| 49 | # Detect if strerror_r works, but without affecting whether a replacement
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| 50 | # strerror_r will be used.
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| 51 | AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
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| 52 | [
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| 53 | AC_REQUIRE([gl_HEADER_ERRNO_H])
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| 54 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 55 | AC_REQUIRE([gl_FUNC_STRERROR_0])
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| 56 |
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| 57 | AC_CHECK_FUNCS_ONCE([strerror_r])
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| 58 | if test $ac_cv_func_strerror_r = yes; then
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| 59 | if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
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| 60 | dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
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| 61 | dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
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| 62 | dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
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| 63 | AC_CACHE_CHECK([for strerror_r with POSIX signature],
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| 64 | [gl_cv_func_strerror_r_posix_signature],
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| 65 | [AC_COMPILE_IFELSE(
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| 66 | [AC_LANG_PROGRAM(
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| 67 | [[#include <string.h>
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| 68 | int strerror_r (int, char *, size_t);
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| 69 | ]],
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| 70 | [])],
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| 71 | [gl_cv_func_strerror_r_posix_signature=yes],
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| 72 | [gl_cv_func_strerror_r_posix_signature=no])
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| 73 | ])
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| 74 | if test $gl_cv_func_strerror_r_posix_signature = yes; then
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| 75 | dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
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| 76 | dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
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| 77 | dnl is less than 80.
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| 78 | dnl FreeBSD 8.s strerror_r claims failure on 0
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| 79 | dnl Mac OS X 10.5 strerror_r treats 0 like -1
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| 80 | dnl Solaris 10 strerror_r corrupts errno on failure
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| 81 | AC_CACHE_CHECK([whether strerror_r works],
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| 82 | [gl_cv_func_strerror_r_works],
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| 83 | [AC_RUN_IFELSE(
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| 84 | [AC_LANG_PROGRAM(
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| 85 | [[#include <errno.h>
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| 86 | #include <string.h>
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| 87 | ]],
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| 88 | [[int result = 0;
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| 89 | char buf[79];
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| 90 | if (strerror_r (EACCES, buf, 0) < 0)
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| 91 | result |= 1;
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| 92 | errno = 0;
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| 93 | if (strerror_r (EACCES, buf, sizeof buf) != 0)
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| 94 | result |= 2;
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| 95 | strcpy (buf, "Unknown");
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| 96 | if (strerror_r (0, buf, sizeof buf) != 0)
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| 97 | result |= 4;
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| 98 | if (errno)
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| 99 | result |= 8;
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| 100 | if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
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| 101 | result |= 0x10;
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| 102 | errno = 0;
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| 103 | *buf = 0;
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| 104 | if (strerror_r (-3, buf, sizeof buf) < 0)
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| 105 | result |= 0x20;
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| 106 | if (errno)
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| 107 | result |= 0x40;
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| 108 | if (!*buf)
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| 109 | result |= 0x80;
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| 110 | return result;
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| 111 | ]])],
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| 112 | [gl_cv_func_strerror_r_works=yes],
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| 113 | [gl_cv_func_strerror_r_works=no],
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| 114 | [
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| 115 | changequote(,)dnl
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| 116 | case "$host_os" in
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| 117 | # Guess no on AIX.
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| 118 | aix*) gl_cv_func_strerror_r_works="guessing no";;
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| 119 | # Guess no on HP-UX.
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| 120 | hpux*) gl_cv_func_strerror_r_works="guessing no";;
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| 121 | # Guess no on BSD variants.
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| 122 | *bsd*) gl_cv_func_strerror_r_works="guessing no";;
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| 123 | # Guess yes otherwise.
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| 124 | *) gl_cv_func_strerror_r_works="guessing yes";;
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| 125 | esac
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| 126 | changequote([,])dnl
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| 127 | ])
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| 128 | ])
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| 129 | else
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| 130 | dnl The system's strerror() has a wrong signature.
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| 131 | dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
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| 132 | AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
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| 133 | dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure.
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| 134 | dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer.
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| 135 | if test $ac_cv_func___xpg_strerror_r = yes; then
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| 136 | AC_CACHE_CHECK([whether __xpg_strerror_r works],
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| 137 | [gl_cv_func_strerror_r_works],
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| 138 | [AC_RUN_IFELSE(
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| 139 | [AC_LANG_PROGRAM(
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| 140 | [[#include <errno.h>
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| 141 | #include <string.h>
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| 142 | extern
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| 143 | #ifdef __cplusplus
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| 144 | "C"
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| 145 | #endif
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| 146 | int __xpg_strerror_r(int, char *, size_t);
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| 147 | ]],
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| 148 | [[int result = 0;
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| 149 | char buf[256] = "^";
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| 150 | char copy[256];
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| 151 | char *str = strerror (-1);
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| 152 | strcpy (copy, str);
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| 153 | if (__xpg_strerror_r (-2, buf, 1) == 0)
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| 154 | result |= 1;
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| 155 | if (*buf)
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| 156 | result |= 2;
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| 157 | __xpg_strerror_r (-2, buf, 256);
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| 158 | if (strcmp (str, copy))
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| 159 | result |= 4;
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| 160 | return result;
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| 161 | ]])],
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| 162 | [gl_cv_func_strerror_r_works=yes],
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| 163 | [gl_cv_func_strerror_r_works=no],
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| 164 | [dnl Guess no on all platforms that have __xpg_strerror_r,
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| 165 | dnl at least until fixed glibc and cygwin are more common.
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| 166 | gl_cv_func_strerror_r_works="$gl_cross_guess_normal"
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| 167 | ])
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| 168 | ])
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| 169 | fi
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| 170 | fi
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| 171 | fi
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| 172 | fi
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| 173 | ])
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