1 # signal_h.m4 serial 11
2 dnl Copyright (C) 2007-2011 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 AC_DEFUN([gl_SIGNAL_H],
9 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
10 gl_NEXT_HEADERS([signal.h])
11 # AIX declares sig_atomic_t to already include volatile, and C89 compilers
12 # then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
13 AC_CHECK_TYPE([volatile sig_atomic_t], [],
14 [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
17 AC_REQUIRE([AC_TYPE_UID_T])
19 dnl Check for declarations of anything we want to poison if the
20 dnl corresponding gnulib module is not in use.
21 gl_WARN_ON_USE_PREPARE([[#include <signal.h>
22 ]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
23 sigpending sigprocmask])
26 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
28 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
29 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
30 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
31 dnl Define it also as a C macro, for the benefit of the unit tests.
32 gl_MODULE_INDICATOR_FOR_TESTS([$1])
35 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
37 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
38 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
39 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
40 dnl Assume proper GNU behavior unless another module says otherwise.
41 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
42 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
43 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
44 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
45 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
46 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
47 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
48 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])