1# signalblocking.m4 serial 4 2dnl Copyright (C) 2001-2002, 2006 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 signals_not_posix= 15 AC_EGREP_HEADER(sigset_t, signal.h, , signals_not_posix=1) 16 if test -z "$signals_not_posix"; then 17 AC_CHECK_FUNC(sigprocmask, [gl_cv_func_sigprocmask=1]) 18 fi 19 if test -n "$gl_cv_func_sigprocmask"; then 20 AC_DEFINE([HAVE_POSIX_SIGNALBLOCKING], 1, 21 [Define to 1 if you have the sigset_t type and the sigprocmask function.]) 22 else 23 AC_LIBOBJ([sigprocmask]) 24 gl_PREREQ_SIGPROCMASK 25 fi 26]) 27 28# Prerequisites of lib/sigprocmask.h and lib/sigprocmask.c. 29AC_DEFUN([gl_PREREQ_SIGPROCMASK], [ 30 AC_CHECK_TYPES([sigset_t], 31 [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no], 32 [#include <signal.h> 33/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */ 34#include <sys/types.h>]) 35 if test $gl_cv_type_sigset_t = yes; then 36 AC_DEFINE([HAVE_SIGSET_T], [1], 37 [Define to 1 if you lack the sigprocmask function but have the sigset_t type.]) 38 fi 39 AC_CHECK_FUNCS_ONCE(raise) 40]) 41