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      1 # signal_h.m4 serial 18
      2 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 AC_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   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 
     39 AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
     40 [
     41   AC_CHECK_TYPES([sigset_t],
     42     [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
     43     [[
     44       #include <signal.h>
     45       /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
     46       #include <sys/types.h>
     47     ]])
     48   if test $gl_cv_type_sigset_t != yes; then
     49     HAVE_SIGSET_T=0
     50   fi
     51 ])
     52 
     53 AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
     54 [
     55   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
     56   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
     57   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
     58   dnl Define it also as a C macro, for the benefit of the unit tests.
     59   gl_MODULE_INDICATOR_FOR_TESTS([$1])
     60 ])
     61 
     62 AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
     63 [
     64   GNULIB_PTHREAD_SIGMASK=0;    AC_SUBST([GNULIB_PTHREAD_SIGMASK])
     65   GNULIB_RAISE=0;              AC_SUBST([GNULIB_RAISE])
     66   GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
     67   GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
     68   GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
     69   dnl Assume proper GNU behavior unless another module says otherwise.
     70   HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
     71   HAVE_PTHREAD_SIGMASK=1;      AC_SUBST([HAVE_PTHREAD_SIGMASK])
     72   HAVE_RAISE=1;                AC_SUBST([HAVE_RAISE])
     73   HAVE_SIGSET_T=1;             AC_SUBST([HAVE_SIGSET_T])
     74   HAVE_SIGINFO_T=1;            AC_SUBST([HAVE_SIGINFO_T])
     75   HAVE_SIGACTION=1;            AC_SUBST([HAVE_SIGACTION])
     76   HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
     77                                AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
     78   HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
     79                                AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
     80   HAVE_SIGHANDLER_T=1;         AC_SUBST([HAVE_SIGHANDLER_T])
     81   REPLACE_PTHREAD_SIGMASK=0;   AC_SUBST([REPLACE_PTHREAD_SIGMASK])
     82   REPLACE_RAISE=0;             AC_SUBST([REPLACE_RAISE])
     83 ])
     84