1# signal_h.m4 serial 22 2dnl Copyright (C) 2007-2022 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_ONCE([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 55# gl_SIGNAL_MODULE_INDICATOR([modulename]) 56# sets the shell variable that indicates the presence of the given module 57# to a C preprocessor expression that will evaluate to 1. 58# This macro invocation must not occur in macros that are AC_REQUIREd. 59AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR], 60[ 61 dnl Ensure to expand the default settings once only. 62 gl_SIGNAL_H_REQUIRE_DEFAULTS 63 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 64 dnl Define it also as a C macro, for the benefit of the unit tests. 65 gl_MODULE_INDICATOR_FOR_TESTS([$1]) 66]) 67 68# Initializes the default values for AC_SUBSTed shell variables. 69# This macro must not be AC_REQUIREd. It must only be invoked, and only 70# outside of macros or in macros that are not AC_REQUIREd. 71AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS], 72[ 73 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [ 74 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK]) 75 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE]) 76 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE]) 77 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK]) 78 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION]) 79 ]) 80 m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS]) 81 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) 82]) 83 84AC_DEFUN([gl_SIGNAL_H_DEFAULTS], 85[ 86 dnl Assume proper GNU behavior unless another module says otherwise. 87 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING]) 88 HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK]) 89 HAVE_RAISE=1; AC_SUBST([HAVE_RAISE]) 90 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T]) 91 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T]) 92 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION]) 93 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1; 94 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION]) 95 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1; 96 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T]) 97 HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T]) 98 REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK]) 99 REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE]) 100]) 101