1# signal_h.m4 serial 16 2dnl Copyright (C) 2007-2011 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([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 AC_REQUIRE([AC_TYPE_UID_T]) 21 22 dnl Persuade glibc <signal.h> to define sighandler_t. 23 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 24 AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[ 25#include <signal.h> 26 ]]) 27 28 dnl Check for declarations of anything we want to poison if the 29 dnl corresponding gnulib module is not in use. 30 gl_WARN_ON_USE_PREPARE([[#include <signal.h> 31 ]], [pthread_sigmask sigaction 32 sigaddset sigdelset sigemptyset sigfillset sigismember 33 sigpending sigprocmask]) 34]) 35 36AC_DEFUN([gl_CHECK_TYPE_SIGSET_T], 37[ 38 AC_CHECK_TYPES([sigset_t], 39 [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no], 40 [[ 41 #include <signal.h> 42 /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */ 43 #include <sys/types.h> 44 ]]) 45 if test $gl_cv_type_sigset_t != yes; then 46 HAVE_SIGSET_T=0 47 fi 48]) 49 50AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR], 51[ 52 dnl Use AC_REQUIRE here, so that the default settings are expanded once only. 53 AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) 54 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 55 dnl Define it also as a C macro, for the benefit of the unit tests. 56 gl_MODULE_INDICATOR_FOR_TESTS([$1]) 57]) 58 59AC_DEFUN([gl_SIGNAL_H_DEFAULTS], 60[ 61 GNULIB_PTHREAD_SIGMASK=0; AC_SUBST([GNULIB_PTHREAD_SIGMASK]) 62 GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE]) 63 GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK]) 64 GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION]) 65 dnl Assume proper GNU behavior unless another module says otherwise. 66 HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING]) 67 HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK]) 68 HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T]) 69 HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T]) 70 HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION]) 71 HAVE_STRUCT_SIGACTION_SA_SIGACTION=1; 72 AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION]) 73 HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1; 74 AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T]) 75 HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T]) 76 REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK]) 77]) 78