1# signalblocking.m4 serial 17
2dnl Copyright (C) 2001-2002, 2006-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7# Determine available signal blocking primitives. Three different APIs exist:
8# 1) POSIX: sigemptyset, sigaddset, sigprocmask
9# 2) SYSV: sighold, sigrelse
10# 3) BSD: sigblock, sigsetmask
11# For simplicity, here we check only for the POSIX signal blocking.
12AC_DEFUN([gl_SIGNALBLOCKING],
13[
14  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
15  AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
16  HAVE_POSIX_SIGNALBLOCKING=0
17  if test "$gl_cv_type_sigset_t" = yes; then
18    AC_CHECK_FUNC([sigprocmask], [HAVE_POSIX_SIGNALBLOCKING=1])
19  fi
20])
21
22# Prerequisites of lib/sigprocmask.c.
23AC_DEFUN([gl_PREREQ_SIGPROCMASK], [:])
24