proto-shell: pass the return code of the proto task to the teardown handler

diff --git a/proto-shell.c b/proto-shell.c
index 3b5311c..726977a 100644 (file)
--- a/proto-shell.c
+++ b/proto-shell.c
@@ -42,6 +42,7 @@ struct proto_shell_state {
        bool teardown_wait_task;
 
        struct netifd_process proto_task;
+       int last_error;
 };
 
 static int
@@ -51,10 +52,12 @@ proto_shell_handler(struct interface_proto_state *proto,
        struct proto_shell_state *state;
        struct proto_shell_handler *handler;
        struct netifd_process *proc;
-       const char *argv[6];
+       static char error_buf[32];
+       const char *argv[7];
+       char *envp[2];
        const char *action;
        char *config;
-       int ret, i = 0;
+       int ret, i = 0, j = 0;
 
        state = container_of(proto, struct proto_shell_state, proto);
        handler = state->handler;
@@ -62,6 +65,7 @@ proto_shell_handler(struct interface_proto_state *proto,
        if (cmd == PROTO_CMD_SETUP) {
                action = "setup";
                proc = &state->setup_task;
+               state->last_error = -1;
        } else {
                action = "teardown";
                proc = &state->teardown_task;
@@ -71,6 +75,10 @@ proto_shell_handler(struct interface_proto_state *proto,
                        state->teardown_pending = true;
                        return 0;
                }
+               if (state->last_error >= 0) {
+                       snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
+                       envp[j++] = error_buf;
+               }
        }
 
        config = blobmsg_format_json(state->config, true);
@@ -85,8 +93,9 @@ proto_shell_handler(struct interface_proto_state *proto,
        if (proto->iface->main_dev.dev)
                argv[i++] = proto->iface->main_dev.dev->ifname;
        argv[i] = NULL;
+       envp[j] = NULL;
 
-       ret = netifd_start_process(argv, NULL, proc);
+       ret = netifd_start_process(argv, envp, proc);
        free(config);
 
        return ret;
@@ -146,6 +155,7 @@ proto_shell_task_cb(struct netifd_process *p, int ret)
                return;
        }
 
+       state->last_error = ret;
        state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
        proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 }