From 2d99476b851d50b376bafb2bc12994d8b0950538 Mon Sep 17 00:00:00 2001
From: Pierre-Marc Fournier <pierre-marc.fournier@polymtl.ca>
Date: Wed, 22 Jul 2009 17:34:56 -0400
Subject: [PATCH] add ilbinterfork

---
 Makefile.am              |  2 +-
 configure.ac             |  1 +
 libinterfork/Makefile.am |  3 +++
 libinterfork/interfork.c | 44 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 libinterfork/Makefile.am
 create mode 100644 libinterfork/interfork.c

diff --git a/Makefile.am b/Makefile.am
index 1f9ba75..6580978 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@
 ACLOCAL_AMFLAGS = -I m4
-SUBDIRS = libust tests libmallocwrap ustd ust
+SUBDIRS = libust tests libmallocwrap ustd ust libinterfork
 
 EXTRA_DIST = share/kernelcompat.h doc
diff --git a/configure.ac b/configure.ac
index 21e00b5..a8accce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,7 @@ AC_CONFIG_FILES([
 	tests/hello/Makefile
 	tests/hello2/Makefile
 	libmallocwrap/Makefile
+	libinterfork/Makefile
 	ustd/Makefile
 	ust/Makefile
 ])
diff --git a/libinterfork/Makefile.am b/libinterfork/Makefile.am
new file mode 100644
index 0000000..11ee0c9
--- /dev/null
+++ b/libinterfork/Makefile.am
@@ -0,0 +1,3 @@
+lib_LTLIBRARIES = libinterfork.la
+libinterfork_la_SOURCES = interfork.c
+libinterfork_la_LIBADD = -ldl
diff --git a/libinterfork/interfork.c b/libinterfork/interfork.c
new file mode 100644
index 0000000..e57b7e5
--- /dev/null
+++ b/libinterfork/interfork.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 2009  Pierre-Marc Fournier
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <unistd.h>
+#include <stdio.h>
+
+pid_t fork(void)
+{
+	static pid_t (*plibc_func)(void) = NULL;
+
+	pid_t retval;
+
+	if(plibc_func == NULL) {
+		plibc_func = dlsym(RTLD_NEXT, "fork");
+		if(plibc_func == NULL) {
+			fprintf(stderr, "libcwrap: unable to find fork\n");
+			return NULL;
+		}
+	}
+
+	printf("IN FORK!\n");
+	retval = plibc_func();
+
+	if(retval == 0)
+		ust_fork();
+
+	return retval;
+}
-- 
2.34.1