| 1 | # signal_h.m4 serial 22
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| 2 | dnl Copyright (C) 2007-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN_ONCE([gl_SIGNAL_H],
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| 8 | [
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| 9 | AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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| 10 | AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
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| 11 | gl_NEXT_HEADERS([signal.h])
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| 12 |
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| 13 | # AIX declares sig_atomic_t to already include volatile, and C89 compilers
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| 14 | # then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
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| 15 | AC_CHECK_TYPE([volatile sig_atomic_t], [],
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| 16 | [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
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| 17 | #include <signal.h>
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| 18 | ]])
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| 19 |
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| 20 | dnl Ensure the type pid_t gets defined.
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| 21 | AC_REQUIRE([AC_TYPE_PID_T])
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| 22 |
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| 23 | AC_REQUIRE([AC_TYPE_UID_T])
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| 24 |
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| 25 | dnl Persuade glibc <signal.h> to define sighandler_t.
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| 26 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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| 27 | AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
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| 28 | #include <signal.h>
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| 29 | ]])
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| 30 |
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| 31 | dnl Check for declarations of anything we want to poison if the
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| 32 | dnl corresponding gnulib module is not in use.
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| 33 | gl_WARN_ON_USE_PREPARE([[#include <signal.h>
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| 34 | ]], [pthread_sigmask sigaction
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| 35 | sigaddset sigdelset sigemptyset sigfillset sigismember
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| 36 | sigpending sigprocmask])
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| 37 |
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| 38 | AC_REQUIRE([AC_C_RESTRICT])
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| 39 | ])
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| 40 |
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| 41 | AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
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| 42 | [
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| 43 | AC_CHECK_TYPES([sigset_t],
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| 44 | [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
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| 45 | [[
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| 46 | #include <signal.h>
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| 47 | /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
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| 48 | #include <sys/types.h>
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| 49 | ]])
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| 50 | if test $gl_cv_type_sigset_t != yes; then
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| 51 | HAVE_SIGSET_T=0
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| 52 | fi
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| 53 | ])
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| 54 |
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| 55 | # gl_SIGNAL_MODULE_INDICATOR([modulename])
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| 56 | # sets the shell variable that indicates the presence of the given module
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| 57 | # to a C preprocessor expression that will evaluate to 1.
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| 58 | # This macro invocation must not occur in macros that are AC_REQUIREd.
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| 59 | AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
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| 60 | [
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| 61 | dnl Ensure to expand the default settings once only.
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| 62 | gl_SIGNAL_H_REQUIRE_DEFAULTS
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| 63 | gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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| 64 | dnl Define it also as a C macro, for the benefit of the unit tests.
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| 65 | gl_MODULE_INDICATOR_FOR_TESTS([$1])
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| 66 | ])
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| 67 |
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| 68 | # Initializes the default values for AC_SUBSTed shell variables.
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| 69 | # This macro must not be AC_REQUIREd. It must only be invoked, and only
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| 70 | # outside of macros or in macros that are not AC_REQUIREd.
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| 71 | AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS],
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| 72 | [
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| 73 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [
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| 74 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK])
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| 75 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE])
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| 76 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE])
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| 77 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK])
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| 78 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION])
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| 79 | ])
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| 80 | m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS])
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| 81 | AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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| 82 | ])
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| 83 |
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| 84 | AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
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| 85 | [
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| 86 | dnl Assume proper GNU behavior unless another module says otherwise.
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| 87 | HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
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| 88 | HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK])
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| 89 | HAVE_RAISE=1; AC_SUBST([HAVE_RAISE])
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| 90 | HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
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| 91 | HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
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| 92 | HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
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| 93 | HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
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| 94 | AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
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| 95 | HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
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| 96 | AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
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| 97 | HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
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| 98 | REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK])
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| 99 | REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE])
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| 100 | ])
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