From 48ef50f6c33d7fc7cfadf26fe0dc7034ea93a4f0 Mon Sep 17 00:00:00 2001
From: ltfetch <ltfetch@github.com>
Date: Sun, 26 Oct 2014 20:40:24 -0500
Subject: [PATCH] use pipe to block process exit until all transitive children
 exit

---
 src/faketime.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/faketime.c b/src/faketime.c
index ab09407..1a31ee6 100644
--- a/src/faketime.c
+++ b/src/faketime.c
@@ -198,6 +198,8 @@ int main (int argc, char **argv)
     /* simply pass format string along */
     setenv("FAKETIME", argv[curr_opt], true);
   }
+  int keepalive_fds[2];
+  (void) (pipe(keepalive_fds) + 1);
 
   /* we just consumed the timestamp option */
   curr_opt++;
@@ -334,6 +336,7 @@ int main (int argc, char **argv)
   /* run command and clean up shared objects */
   if (0 == (child_pid = fork()))
   {
+    close(keepalive_fds[0]); /* only parent needs to read this */
     if (EXIT_SUCCESS != execvp(argv[curr_opt], &argv[curr_opt]))
     {
       perror("Running specified command failed");
@@ -343,7 +346,10 @@ int main (int argc, char **argv)
   else
   {
     int ret;
+    char buf;
+    close(keepalive_fds[1]); /* only children need keep this open */
     waitpid(child_pid, &ret, 0);
+    (void) (read(keepalive_fds[0], &buf, 1) + 1); /* reads 0B when all children exit */
     cleanup_shobjs();
     if (WIFSIGNALED(ret))
     {