signal_h.m4 2.21 KB
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# signal_h.m4 serial 12
dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_SIGNAL_H],
[
  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
  gl_NEXT_HEADERS([signal.h])

# AIX declares sig_atomic_t to already include volatile, and C89 compilers
# then choke on 'volatile sig_atomic_t'.  C99 requires that it compile.
  AC_CHECK_TYPE([volatile sig_atomic_t], [],
    [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
#include <signal.h>
    ]])

  AC_REQUIRE([AC_TYPE_UID_T])

  dnl Persuade glibc <signal.h> to define sighandler_t.
  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
#include <signal.h>
    ]])

  dnl Check for declarations of anything we want to poison if the
  dnl corresponding gnulib module is not in use.
  gl_WARN_ON_USE_PREPARE([[#include <signal.h>
    ]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
    sigpending sigprocmask])
])

AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  dnl Define it also as a C macro, for the benefit of the unit tests.
  gl_MODULE_INDICATOR_FOR_TESTS([$1])
])

AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
[
  GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
  GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
  GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
  HAVE_SIGSET_T=1;             AC_SUBST([HAVE_SIGSET_T])
  HAVE_SIGINFO_T=1;            AC_SUBST([HAVE_SIGINFO_T])
  HAVE_SIGACTION=1;            AC_SUBST([HAVE_SIGACTION])
  HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
                               AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
  HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
                               AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
  HAVE_SIGHANDLER_T=1;         AC_SUBST([HAVE_SIGHANDLER_T])
])