1 # signalblocking.m4 serial 16
2 dnl Copyright (C) 2001-2002, 2006-2020 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
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.
12 AC_DEFUN([gl_SIGNALBLOCKING],
14 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
15 AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
16 AC_CACHE_CHECK([for sigprocmask],
17 [gl_cv_func_sigprocmask_v16],
18 [if test $gl_cv_type_sigset_t = yes; then
20 AC_CHECK_FUNC([sigprocmask],
21 [gl_cv_func_sigprocmask_v16=yes],
22 [gl_cv_func_sigprocmask_v16=no])
25 gl_cv_func_sigprocmask_v16=no
28 if test $gl_cv_func_sigprocmask_v16 != yes; then
29 HAVE_POSIX_SIGNALBLOCKING=0
33 # Prerequisites of lib/sigprocmask.c.
34 AC_DEFUN([gl_PREREQ_SIGPROCMASK], [:])