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# signal_h.m4
# serial 23
dnl Copyright (C) 2007-2024 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_ONCE([gl_SIGNAL_H],
[
AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
gl_NEXT_HEADERS([signal.h])
# AIX declares sig_atomic_t to already include volatile, and C89 compilers
# then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
AC_CHECK_TYPE([volatile sig_atomic_t], [],
[HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
#include <signal.h>
]])
dnl Ensure the type pid_t gets defined.
AC_REQUIRE([AC_TYPE_PID_T])
AC_REQUIRE([AC_TYPE_UID_T])
dnl Persuade glibc <signal.h> to define sighandler_t.
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
#include <signal.h>
]])
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use.
gl_WARN_ON_USE_PREPARE([[#include <signal.h>
]], [sig2str str2sig
pthread_sigmask sigaction
sigaddset sigdelset sigemptyset sigfillset sigismember
sigpending sigprocmask])
AC_REQUIRE([AC_C_RESTRICT])
])
AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
[
AC_CHECK_TYPES([sigset_t],
[gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
[[
#include <signal.h>
/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
#include <sys/types.h>
]])
if test $gl_cv_type_sigset_t != yes; then
HAVE_SIGSET_T=0
fi
])
# gl_SIGNAL_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_SIGNAL_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIG2STR])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
])
AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK])
HAVE_RAISE=1; AC_SUBST([HAVE_RAISE])
HAVE_SIG2STR=1; AC_SUBST([HAVE_SIG2STR])
HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
HAVE_STR2SIG=1; AC_SUBST([HAVE_STR2SIG])
HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK])
REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE])
])
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