1# signal_h.m4 serial 19
2dnl Copyright (C) 2007-2020 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  dnl Ensure the type pid_t gets defined.
21  AC_REQUIRE([AC_TYPE_PID_T])
22
23  AC_REQUIRE([AC_TYPE_UID_T])
24
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], [[
28#include <signal.h>
29    ]])
30
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])
37
38  AC_REQUIRE([AC_C_RESTRICT])
39])
40
41AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
42[
43  AC_CHECK_TYPES([sigset_t],
44    [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
45    [[
46      #include <signal.h>
47      /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
48      #include <sys/types.h>
49    ]])
50  if test $gl_cv_type_sigset_t != yes; then
51    HAVE_SIGSET_T=0
52  fi
53])
54
55AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
56[
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])
62])
63
64AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
65[
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])
85])
86