1 # signalblocking.m4 serial 10
2 dnl Copyright (C) 2001-2002, 2006-2011 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])
16 AC_EGREP_HEADER([sigset_t], [signal.h], , [signals_not_posix=1])
17 if test -z "$signals_not_posix"; then
18 AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1])
20 if test -z "$gl_cv_func_sigprocmask"; then
21 HAVE_POSIX_SIGNALBLOCKING=0
22 AC_LIBOBJ([sigprocmask])
27 # Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c.
28 AC_DEFUN([gl_PREREQ_SIGPROCMASK],
30 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
31 AC_CHECK_TYPES([sigset_t],
32 [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
34 /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
35 #include <sys/types.h>])
36 if test $gl_cv_type_sigset_t != yes; then
39 dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has
40 dnl the sigset_t type.
41 AC_SUBST([HAVE_SIGSET_T])