1# signal_h.m4 serial 16
2dnl Copyright (C) 2007-2011 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
7AC_DEFUN([gl_SIGNAL_H],
8[
9  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
10  AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
11  gl_NEXT_HEADERS([signal.h])
12
13# AIX declares sig_atomic_t to already include volatile, and C89 compilers
14# then choke on 'volatile sig_atomic_t'.  C99 requires that it compile.
15  AC_CHECK_TYPE([volatile sig_atomic_t], [],
16    [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
17#include <signal.h>
18    ]])
19
20  AC_REQUIRE([AC_TYPE_UID_T])
21
22  dnl Persuade glibc <signal.h> to define sighandler_t.
23  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
24  AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
25#include <signal.h>
26    ]])
27
28  dnl Check for declarations of anything we want to poison if the
29  dnl corresponding gnulib module is not in use.
30  gl_WARN_ON_USE_PREPARE([[#include <signal.h>
31    ]], [pthread_sigmask sigaction
32    sigaddset sigdelset sigemptyset sigfillset sigismember
33    sigpending sigprocmask])
34])
35
36AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
37[
38  AC_CHECK_TYPES([sigset_t],
39    [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
40    [[
41      #include <signal.h>
42      /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
43      #include <sys/types.h>
44    ]])
45  if test $gl_cv_type_sigset_t != yes; then
46    HAVE_SIGSET_T=0
47  fi
48])
49
50AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
51[
52  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
53  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
54  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
55  dnl Define it also as a C macro, for the benefit of the unit tests.
56  gl_MODULE_INDICATOR_FOR_TESTS([$1])
57])
58
59AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
60[
61  GNULIB_PTHREAD_SIGMASK=0;    AC_SUBST([GNULIB_PTHREAD_SIGMASK])
62  GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
63  GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
64  GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
65  dnl Assume proper GNU behavior unless another module says otherwise.
66  HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
67  HAVE_PTHREAD_SIGMASK=1;      AC_SUBST([HAVE_PTHREAD_SIGMASK])
68  HAVE_SIGSET_T=1;             AC_SUBST([HAVE_SIGSET_T])
69  HAVE_SIGINFO_T=1;            AC_SUBST([HAVE_SIGINFO_T])
70  HAVE_SIGACTION=1;            AC_SUBST([HAVE_SIGACTION])
71  HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
72                               AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
73  HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
74                               AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
75  HAVE_SIGHANDLER_T=1;         AC_SUBST([HAVE_SIGHANDLER_T])
76  REPLACE_PTHREAD_SIGMASK=0;   AC_SUBST([REPLACE_PTHREAD_SIGMASK])
77])
78