-# strerror_r.m4 serial 3
-dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc.
+# strerror_r.m4 serial 15
+dnl Copyright (C) 2002, 2007-2014 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_HEADER_ERRNO_H])
- AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
dnl Persuade Solaris <string.h> to declare strerror_r().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
HAVE_DECL_STRERROR_R=0
fi
- AC_CHECK_FUNCS([strerror_r])
if test $ac_cv_func_strerror_r = yes; then
- if test -z "$ERRNO_H"; 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:$REPLACE_STRERROR_0" = :0; then
dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
- dnl glibc's prototype: char *strerror_r (int, char *, size_t);
+ dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
AC_CACHE_CHECK([for strerror_r with POSIX signature],
[gl_cv_func_strerror_r_posix_signature],
[[#include <string.h>
int strerror_r (int, char *, size_t);
]],
- [[return strerror (0);]])],
+ [])],
[gl_cv_func_strerror_r_posix_signature=yes],
[gl_cv_func_strerror_r_posix_signature=no])
])
dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
dnl is less than 80.
+ dnl FreeBSD 8.s strerror_r claims failure on 0
+ dnl Mac OS X 10.5 strerror_r treats 0 like -1
+ dnl Solaris 10 strerror_r corrupts errno on failure
AC_CACHE_CHECK([whether strerror_r works],
[gl_cv_func_strerror_r_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <errno.h>
#include <string.h>
- int strerror_r (int, char *, size_t);
]],
[[int result = 0;
char buf[79];
if (strerror_r (EACCES, buf, 0) < 0)
result |= 1;
- if (strerror_r (EACCES, buf, sizeof (buf)) != 0)
+ errno = 0;
+ if (strerror_r (EACCES, buf, sizeof buf) != 0)
result |= 2;
+ strcpy (buf, "Unknown");
+ if (strerror_r (0, buf, sizeof buf) != 0)
+ result |= 4;
+ if (errno)
+ result |= 8;
+ if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
+ result |= 0x10;
+ errno = 0;
+ *buf = 0;
+ if (strerror_r (-3, buf, sizeof buf) < 0)
+ result |= 0x20;
+ if (errno)
+ result |= 0x40;
+ if (!*buf)
+ result |= 0x80;
return result;
]])],
[gl_cv_func_strerror_r_works=yes],
aix*) gl_cv_func_strerror_r_works="guessing no";;
# Guess no on HP-UX.
hpux*) gl_cv_func_strerror_r_works="guessing no";;
+ # Guess no on BSD variants.
+ *bsd*) gl_cv_func_strerror_r_works="guessing no";;
# Guess yes otherwise.
*) gl_cv_func_strerror_r_works="guessing yes";;
esac
changequote([,])dnl
])
])
- case "$gl_cv_func_strerror_r_works" in
- *no) REPLACE_STRERROR_R=1 ;;
- esac
else
- dnl The system's strerror() has a wrong signature. Replace it.
- REPLACE_STRERROR_R=1
- dnl glibc >= 2.3.4 has a function __xpg_strerror_r.
- AC_CHECK_FUNCS([__xpg_strerror_r])
+ 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="guessing no"
+ ])
+ ])
+ fi
fi
- else
- dnl The system's strerror_r() cannot know about the new errno values we
- dnl add to <errno.h>. Replace it.
- REPLACE_STRERROR_R=1
- AC_DEFINE([EXTEND_STRERROR_R], [1],
- [Define to 1 if strerror_r needs to be extended so that it handles the
- extra errno values.])
fi
fi
- if test $HAVE_DECL_STRERROR_R = 0 || test $REPLACE_STRERROR_R = 1; then
- AC_LIBOBJ([strerror_r])
- gl_PREREQ_STRERROR_R
- fi
-])
-
-# Prerequisites of lib/strerror_r.c.
-AC_DEFUN([gl_PREREQ_STRERROR_R], [
- :
])
projects / gnulib.git / blobdiff