Autogen update

[nfs-utils.git] / aclocal / bsdsignals.m4

diff --git a/aclocal/bsdsignals.m4 b/aclocal/bsdsignals.m4
new file mode 100644 (file)
index 0000000..e951194
--- /dev/null
+++ b/aclocal/bsdsignals.m4
@@ -0,0 +1,29 @@
+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_TRY_RUN([
+       #include <signal.h>
+       #include <unistd.h>
+       #include <sys/wait.h>
+
+       static int counter = 0;
+       static RETSIGTYPE 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)]) 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