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# strsignal.m4 serial 8
dnl Copyright (C) 2008-2020 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_STRSIGNAL],
[
dnl Persuade glibc <string.h> to declare strsignal().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_DECLS_ONCE([strsignal])
if test $ac_cv_have_decl_strsignal = no; then
HAVE_DECL_STRSIGNAL=0
fi
AC_CHECK_FUNCS([strsignal])
if test $ac_cv_func_strsignal = yes; then
HAVE_STRSIGNAL=1
dnl Check if strsignal behaves reasonably for out-of-range signal numbers.
dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1.
AC_CACHE_CHECK([whether strsignal always returns a string],
[gl_cv_func_working_strsignal],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
]],
[[int result = 0;
char *s = strsignal (-1);
if (s == (char *) 0)
result |= 1;
if (s == (char *) -1)
result |= 2;
return result;
]])],
[gl_cv_func_working_strsignal=yes],
[gl_cv_func_working_strsignal=no],
[case "$host_os" in
solaris* | aix*) gl_cv_func_working_strsignal=no;;
*) gl_cv_func_working_strsignal="guessing yes";;
esac])])
if test "$gl_cv_func_working_strsignal" = no; then
REPLACE_STRSIGNAL=1
fi
else
HAVE_STRSIGNAL=0
fi
])
# Prerequisites of lib/strsignal.c.
AC_DEFUN([gl_PREREQ_STRSIGNAL], [
AC_CHECK_HEADERS_ONCE([unistd.h])
AC_REQUIRE([AC_DECL_SYS_SIGLIST])
AC_CHECK_DECLS([_sys_siglist], [], [], [[#include <signal.h>]])
])
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