add ilbinterfork

[ust.git] / libinterfork / interfork.c

diff --git a/libinterfork/interfork.c b/libinterfork/interfork.c
new file mode 100644 (file)
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;
+}