Block parent process until child is initialized.usermode

This way the init system will not proceed starting dependencies until gssproxy
is actually ready to serve requests.
In particular this is used to make sure the nfsd proc file has been touched
before the nfsd server is started.

Resolves: https://fedorahosted.org/gss-proxy/ticket/114

Signed-off-by: Simo Sorce <simo@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/proxy/src/gssproxy.c b/proxy/src/gssproxy.c
index 1bf0a0b..80430d6 100644
--- a/proxy/src/gssproxy.c
+++ b/proxy/src/gssproxy.c
@@ -42,6 +42,7 @@ int main(int argc, const char *argv[])
     int vflags;
     struct gssproxy_ctx *gpctx;
     struct gp_sock_ctx *sock_ctx;
+    int wait_fd;
     int ret;
     int i;
 
@@ -97,7 +98,7 @@ int main(int argc, const char *argv[])
         exit(EXIT_FAILURE);
     }
 
-    init_server(gpctx->config->daemonize);
+    init_server(gpctx->config->daemonize, &wait_fd);
 
     write_pid();
 
@@ -139,9 +140,15 @@ int main(int argc, const char *argv[])
         }
     }
 
-    /* special call to tell the Linux kernel gss-proxy is available */
+    /* We need to tell nfsd that GSS-Proxy is available before it starts,
+     * as nfsd needs to know GSS-Proxy is in use before the first time it
+     * needs to call accept_sec_context. */
     init_proc_nfsd(gpctx->config);
 
+    /* Now it is safe to tell the init system that we're done starting up,
+     * so it can continue with dependencies and start nfsd */
+    init_done(wait_fd);
+
     ret = drop_privs(gpctx->config);
     if (ret) {
         exit(EXIT_FAILURE);