Support synchronisation with service supervisor using SIGSTOP

Author: Robie Basak <robie.basak@ubuntu.com>
Forwarded: no
Last-Update: 2014-04-14

Patch-Name: sigstop.patch

1 files changed, 10 insertions, 0 deletions

diff --git a/sshd.c b/sshd.c
index 747beec8f..414e19eed 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1878,6 +1878,16 @@ main(int ac, char **av)
                         }
                 }
 
+                if (getenv("SSH_SIGSTOP")) {
+                        /* Tell service supervisor that we are ready. */
+                        kill(getpid(), SIGSTOP);
+                        /* The service supervisor only ever expects a single
+                         * STOP signal, so do not ever signal it again, even
+                         * in the case of a re-exec or future children.
+                         */
+                        unsetenv("SSH_SIGSTOP");
+                }
+
                 /* Accept a connection and return in a forked child */
                 server_accept_loop(&sock_in, &sock_out,
                     &newsock, config_s);