1 # signal_h.m4 serial 12
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])
12 # AIX declares sig_atomic_t to already include volatile, and C89 compilers
13 # then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
14 AC_CHECK_TYPE([volatile sig_atomic_t], [],
15 [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
19 AC_REQUIRE([AC_TYPE_UID_T])
21 dnl Persuade glibc <signal.h> to define sighandler_t.
22 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
23 AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
27 dnl Check for declarations of anything we want to poison if the
28 dnl corresponding gnulib module is not in use.
29 gl_WARN_ON_USE_PREPARE([[#include <signal.h>
30 ]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
31 sigpending sigprocmask])
34 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
36 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
37 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
38 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
39 dnl Define it also as a C macro, for the benefit of the unit tests.
40 gl_MODULE_INDICATOR_FOR_TESTS([$1])
43 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
45 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
46 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
47 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
48 dnl Assume proper GNU behavior unless another module says otherwise.
49 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
50 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
51 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
52 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
53 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
54 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
55 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
56 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
57 HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])