1 # signal_h.m4 serial 19
2 dnl Copyright (C) 2007-2020 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 AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
11 gl_NEXT_HEADERS([signal.h])
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], [[
20 dnl Ensure the type pid_t gets defined.
21 AC_REQUIRE([AC_TYPE_PID_T])
23 AC_REQUIRE([AC_TYPE_UID_T])
25 dnl Persuade glibc <signal.h> to define sighandler_t.
26 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
27 AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
31 dnl Check for declarations of anything we want to poison if the
32 dnl corresponding gnulib module is not in use.
33 gl_WARN_ON_USE_PREPARE([[#include <signal.h>
34 ]], [pthread_sigmask sigaction
35 sigaddset sigdelset sigemptyset sigfillset sigismember
36 sigpending sigprocmask])
38 AC_REQUIRE([AC_C_RESTRICT])
41 AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
43 AC_CHECK_TYPES([sigset_t],
44 [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
47 /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
48 #include <sys/types.h>
50 if test $gl_cv_type_sigset_t != yes; then
55 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
57 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
58 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
59 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
60 dnl Define it also as a C macro, for the benefit of the unit tests.
61 gl_MODULE_INDICATOR_FOR_TESTS([$1])
64 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
66 GNULIB_PTHREAD_SIGMASK=0; AC_SUBST([GNULIB_PTHREAD_SIGMASK])
67 GNULIB_RAISE=0; AC_SUBST([GNULIB_RAISE])
68 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
69 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
70 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
71 dnl Assume proper GNU behavior unless another module says otherwise.
72 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
73 HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK])
74 HAVE_RAISE=1; AC_SUBST([HAVE_RAISE])
75 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
76 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
77 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
78 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
79 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
80 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
81 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
82 HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
83 REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK])
84 REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE])