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# signalblocking.m4 serial 15
dnl Copyright (C) 2001-2002, 2006-2020 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.
# Determine available signal blocking primitives. Three different APIs exist:
# 1) POSIX: sigemptyset, sigaddset, sigprocmask
# 2) SYSV: sighold, sigrelse
# 3) BSD: sigblock, sigsetmask
# For simplicity, here we check only for the POSIX signal blocking.
AC_DEFUN([gl_SIGNALBLOCKING],
[
AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
AC_CACHE_CHECK([for sigprocmask],
[gl_cv_func_sigprocmask],
[if test $gl_cv_type_sigset_t = yes; then
gl_SILENT([
AC_CHECK_FUNC([sigprocmask],
[gl_cv_func_sigprocmask=yes],
[gl_cv_func_sigprocmask=no])
])
else
gl_cv_func_sigprocmask=no
fi
])
if test $gl_cv_func_sigprocmask != yes; then
HAVE_POSIX_SIGNALBLOCKING=0
fi
])
# Prerequisites of lib/sigprocmask.c.
AC_DEFUN([gl_PREREQ_SIGPROCMASK], [:])
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