102 lines
3.7 KiB
Plaintext
102 lines
3.7 KiB
Plaintext
# signal_h.m4
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# serial 22
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dnl Copyright (C) 2007-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN_ONCE([gl_SIGNAL_H],
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[
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
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gl_NEXT_HEADERS([signal.h])
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# AIX declares sig_atomic_t to already include volatile, and C89 compilers
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# then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
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AC_CHECK_TYPE([volatile sig_atomic_t], [],
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[HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
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#include <signal.h>
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]])
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dnl Ensure the type pid_t gets defined.
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AC_REQUIRE([AC_TYPE_PID_T])
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AC_REQUIRE([AC_TYPE_UID_T])
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dnl Persuade glibc <signal.h> to define sighandler_t.
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
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#include <signal.h>
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]])
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[#include <signal.h>
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]], [pthread_sigmask sigaction
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sigaddset sigdelset sigemptyset sigfillset sigismember
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sigpending sigprocmask])
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AC_REQUIRE([AC_C_RESTRICT])
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])
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AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
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[
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AC_CHECK_TYPES([sigset_t],
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[gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
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[[
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#include <signal.h>
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/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
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#include <sys/types.h>
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]])
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if test $gl_cv_type_sigset_t != yes; then
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HAVE_SIGSET_T=0
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fi
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])
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# gl_SIGNAL_MODULE_INDICATOR([modulename])
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# sets the shell variable that indicates the presence of the given module
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# to a C preprocessor expression that will evaluate to 1.
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# This macro invocation must not occur in macros that are AC_REQUIREd.
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AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
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[
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dnl Ensure to expand the default settings once only.
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gl_SIGNAL_H_REQUIRE_DEFAULTS
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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# Initializes the default values for AC_SUBSTed shell variables.
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# This macro must not be AC_REQUIREd. It must only be invoked, and only
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# outside of macros or in macros that are not AC_REQUIREd.
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AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS],
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[
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m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION])
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])
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m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS])
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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])
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AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
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[
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
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HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK])
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HAVE_RAISE=1; AC_SUBST([HAVE_RAISE])
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HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
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HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
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HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
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HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
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AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
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HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
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AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
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HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
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REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK])
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REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE])
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])
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