[PATCH 1/2] pasta: correctly exit when execvp() fails

[Paul Holzinger <pholzing@redhat.com>]

By default clone() will create a child that does not send SIGCHLD when
the child exits. The caller has to specifiy the SIGNAL it should get in
the flag bitmask.
see clone(2) under "The child termination signal"

This fixes the problem where pasta would not exit when the execvp()
call failed, i.e. when the command does not exists.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>
---
 pasta.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pasta.c b/pasta.c
index 528f02a..3f6477c 100644
--- a/pasta.c
+++ b/pasta.c
@@ -229,7 +229,7 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid,
 	pasta_child_pid = do_clone(pasta_spawn_cmd, ns_fn_stack,
 				   sizeof(ns_fn_stack),
 				   CLONE_NEWIPC | CLONE_NEWPID | CLONE_NEWNET |
-				   CLONE_NEWUTS,
+				   CLONE_NEWUTS | SIGCHLD,
 				   (void *)&arg);
 
 	if (pasta_child_pid == -1) {
-- 
@@ -229,7 +229,7 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid,
 	pasta_child_pid = do_clone(pasta_spawn_cmd, ns_fn_stack,
 				   sizeof(ns_fn_stack),
 				   CLONE_NEWIPC | CLONE_NEWPID | CLONE_NEWNET |
-				   CLONE_NEWUTS,
+				   CLONE_NEWUTS | SIGCHLD,
 				   (void *)&arg);
 
 	if (pasta_child_pid == -1) {
-- 
2.39.1