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dnl *********** BSD vs. POSIX signal handling **************
AC_DEFUN([AC_BSD_SIGNALS], [
AC_MSG_CHECKING(for BSD signal semantics)
AC_CACHE_VAL(knfsd_cv_bsd_signals,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
static int counter = 0;
static void handler(int num) { counter++; }
int main()
{
int s;
if ((s = fork()) < 0) return 1;
if (s != 0) {
if (wait(&s) < 0) return 1;
return WIFSIGNALED(s)? 1 : 0;
}
signal(SIGHUP, handler);
kill(getpid(), SIGHUP); kill(getpid(), SIGHUP);
return (counter == 2)? 0 : 1;
}
]])],[knfsd_cv_bsd_signals=yes],[knfsd_cv_bsd_signals=no],[
case "$host_os" in
*linux*) knfsd_cv_bsd_signals=no;;
*bsd*) knfsd_cv_bsd_signals=yes;;
*) AC_MSG_ERROR([unable to guess signal semantics for $host_os; please set knfsd_cv_bsd_signals]);;
esac
])]) dnl
AC_MSG_RESULT($knfsd_cv_bsd_signals)
test $knfsd_cv_bsd_signals = yes && AC_DEFINE(HAVE_BSD_SIGNALS, 1, [Define this if you want to use BSD signal semantics])
])dnl
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