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- # strerror_r.m4 serial 20
- dnl Copyright (C) 2002, 2007-2021 Free Software Foundation, Inc.
- dnl This file is free software; the Free Software Foundation
- dnl gives unlimited permission to copy and/or distribute it,
- dnl with or without modifications, as long as this notice is preserved.
- AC_DEFUN([gl_FUNC_STRERROR_R],
- [
- AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
- AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
- dnl Persuade Solaris <string.h> to declare strerror_r().
- AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
- dnl are not defined.
- AC_CHECK_DECLS_ONCE([strerror_r])
- if test $ac_cv_have_decl_strerror_r = no; then
- HAVE_DECL_STRERROR_R=0
- fi
- if test $ac_cv_func_strerror_r = yes; then
- if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
- if test $gl_cv_func_strerror_r_posix_signature = yes; then
- case "$gl_cv_func_strerror_r_works" in
- dnl The system's strerror_r has bugs. Replace it.
- *no) REPLACE_STRERROR_R=1 ;;
- esac
- else
- dnl The system's strerror_r() has a wrong signature. Replace it.
- REPLACE_STRERROR_R=1
- fi
- else
- dnl The system's strerror_r() cannot know about the new errno values we
- dnl add to <errno.h>, or any fix for strerror(0). Replace it.
- REPLACE_STRERROR_R=1
- fi
- fi
- ])
- # Prerequisites of lib/strerror_r.c.
- AC_DEFUN([gl_PREREQ_STRERROR_R], [
- dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
- AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
- AC_CHECK_FUNCS_ONCE([catgets])
- AC_CHECK_FUNCS_ONCE([snprintf])
- ])
- # Detect if strerror_r works, but without affecting whether a replacement
- # strerror_r will be used.
- AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
- [
- AC_REQUIRE([gl_HEADER_ERRNO_H])
- AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
- AC_REQUIRE([gl_FUNC_STRERROR_0])
- AC_CHECK_FUNCS_ONCE([strerror_r])
- if test $ac_cv_func_strerror_r = yes; then
- if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
- dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
- dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
- dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
- AC_CACHE_CHECK([for strerror_r with POSIX signature],
- [gl_cv_func_strerror_r_posix_signature],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <string.h>
- int strerror_r (int, char *, size_t);
- ]],
- [])],
- [gl_cv_func_strerror_r_posix_signature=yes],
- [gl_cv_func_strerror_r_posix_signature=no])
- ])
- if test $gl_cv_func_strerror_r_posix_signature = yes; then
- dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
- dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
- dnl is less than 80.
- dnl FreeBSD 8.s strerror_r claims failure on 0
- dnl Mac OS X 10.5 strerror_r treats 0 like -1
- dnl Solaris 10 strerror_r corrupts errno on failure
- AC_CACHE_CHECK([whether strerror_r works],
- [gl_cv_func_strerror_r_works],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <errno.h>
- #include <string.h>
- ]],
- [[int result = 0;
- char buf[79];
- if (strerror_r (EACCES, buf, 0) < 0)
- result |= 1;
- errno = 0;
- if (strerror_r (EACCES, buf, sizeof buf) != 0)
- result |= 2;
- strcpy (buf, "Unknown");
- if (strerror_r (0, buf, sizeof buf) != 0)
- result |= 4;
- if (errno)
- result |= 8;
- if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
- result |= 0x10;
- errno = 0;
- *buf = 0;
- if (strerror_r (-3, buf, sizeof buf) < 0)
- result |= 0x20;
- if (errno)
- result |= 0x40;
- if (!*buf)
- result |= 0x80;
- return result;
- ]])],
- [gl_cv_func_strerror_r_works=yes],
- [gl_cv_func_strerror_r_works=no],
- [
- changequote(,)dnl
- case "$host_os" in
- # Guess no on AIX.
- aix*) gl_cv_func_strerror_r_works="guessing no";;
- # Guess no on HP-UX.
- hpux*) gl_cv_func_strerror_r_works="guessing no";;
- # Guess no on BSD variants.
- *bsd*) gl_cv_func_strerror_r_works="guessing no";;
- # Guess yes otherwise.
- *) gl_cv_func_strerror_r_works="guessing yes";;
- esac
- changequote([,])dnl
- ])
- ])
- else
- dnl The system's strerror() has a wrong signature.
- dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
- AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
- dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure.
- dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer.
- if test $ac_cv_func___xpg_strerror_r = yes; then
- AC_CACHE_CHECK([whether __xpg_strerror_r works],
- [gl_cv_func_strerror_r_works],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <errno.h>
- #include <string.h>
- extern
- #ifdef __cplusplus
- "C"
- #endif
- int __xpg_strerror_r(int, char *, size_t);
- ]],
- [[int result = 0;
- char buf[256] = "^";
- char copy[256];
- char *str = strerror (-1);
- strcpy (copy, str);
- if (__xpg_strerror_r (-2, buf, 1) == 0)
- result |= 1;
- if (*buf)
- result |= 2;
- __xpg_strerror_r (-2, buf, 256);
- if (strcmp (str, copy))
- result |= 4;
- return result;
- ]])],
- [gl_cv_func_strerror_r_works=yes],
- [gl_cv_func_strerror_r_works=no],
- [dnl Guess no on all platforms that have __xpg_strerror_r,
- dnl at least until fixed glibc and cygwin are more common.
- gl_cv_func_strerror_r_works="$gl_cross_guess_normal"
- ])
- ])
- fi
- fi
- fi
- fi
- ])
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