Revert "start: Detect early failure of the new child"

This reverts commit 5a5c35c3a01afec515e688c8366e6f893985518d.

This commit was preventing startup of containers using lxc hooks and
shutdown of all other containers, requiring the use of a good old
kill -9 to get rid of lxc-start after a container shutdown.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

diff --git a/src/lxc/start.c b/src/lxc/start.c
index a58737a4f836d57c6650dc26737e8c1340b0dcf1..aefccd6505008dc7681f90d5b271287ebd13f1b5 100644 (file)
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -198,7 +198,6 @@ static int setup_signal_fd(sigset_t *oldmask)
            sigdelset(&mask, SIGILL) ||
            sigdelset(&mask, SIGSEGV) ||
            sigdelset(&mask, SIGBUS) ||
-           sigdelset(&mask, SIGCHLD) ||
            sigprocmask(SIG_BLOCK, &mask, oldmask)) {
                SYSERROR("failed to set signal mask");
                return -1;
@@ -740,29 +739,10 @@ int save_phys_nics(struct lxc_conf *conf)
        return 0;
 }
 
-static void sigchild_handler(int sig)
-{
-       int status;
-       pid_t child;
-
-       child = wait(&status);
-       if (child < 0) {
-               SYSERROR("SIGCHLD caught but wait() failed: %m\n");
-               return;
-       }
-
-       if (WIFSIGNALED(status))
-               ERROR("Process in the new namespace died before execve()"
-                     " due to signal: %i", WTERMSIG(status));
-       else if (WIFEXITED(status))
-               ERROR("Process in the new namespace died before execve()"
-                     " with exit code: %i", WIFEXITED(status));
-}
 
 int lxc_spawn(struct lxc_handler *handler)
 {
        int failed_before_rename = 0;
-       struct sigaction act;
        const char *name = handler->name;
 
        if (lxc_sync_init(handler))
@@ -813,14 +793,6 @@ int lxc_spawn(struct lxc_handler *handler)
                goto out_delete_net;
        }
 
-       /*
-        * Install a SIGCHLD handler to detect the death of the new child between
-        * clone() and execve().
-        */
-       memset(&act, 0, sizeof(act));
-       act.sa_handler = sigchild_handler;
-       sigaction(SIGCHLD, &act, NULL);
-
        /* Create a process in a new set of namespaces */
        handler->pid = lxc_clone(do_start, handler, handler->clone_flags);
        if (handler->pid < 0) {