X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=aclocal%2Fbsdsignals.m4;fp=aclocal%2Fbsdsignals.m4;h=e9511947bcce6f193e403663c8ba17097ae94c4c;hp=0000000000000000000000000000000000000000;hb=ac5b03be829b4c9369ebfb07a688308721103228;hpb=371ca25167a217d647971384c37aa3fcee8a4aef

diff --git a/aclocal/bsdsignals.m4 b/aclocal/bsdsignals.m4
new file mode 100644
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