# signal_h.m4 serial 19

dnl Copyright (C) 2007-2020 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])

  AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])

  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>

    ]])

  dnl Ensure the type pid_t gets defined.

  AC_REQUIRE([AC_TYPE_PID_T])

  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>

    ]], [pthread_sigmask sigaction

    sigaddset sigdelset sigemptyset sigfillset sigismember

    sigpending sigprocmask])

  AC_REQUIRE([AC_C_RESTRICT])

])

AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],

[

  AC_CHECK_TYPES([sigset_t],

    [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],

    [[

      #include <signal.h>

      /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */

      #include <sys/types.h>

    ]])

  if test $gl_cv_type_sigset_t != yes; then

    HAVE_SIGSET_T=0

  fi

])

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_PTHREAD_SIGMASK=0;    AC_SUBST([GNULIB_PTHREAD_SIGMASK])

  GNULIB_RAISE=0;              AC_SUBST([GNULIB_RAISE])

  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_PTHREAD_SIGMASK=1;      AC_SUBST([HAVE_PTHREAD_SIGMASK])

  HAVE_RAISE=1;                AC_SUBST([HAVE_RAISE])

  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])

  REPLACE_PTHREAD_SIGMASK=0;   AC_SUBST([REPLACE_PTHREAD_SIGMASK])

  REPLACE_RAISE=0;             AC_SUBST([REPLACE_RAISE])

])