ubus.c

   1 #include <stdlib.h>
   2 #include <unistd.h>
   3 #include <signal.h>
   4
   5 #include <libubus.h>
   6
   7 #include "procd.h"
   8
   9 char *ubus_socket = NULL;
  10 static struct ubus_context *ctx;
  11 static struct uloop_process ubus_proc;
  12 static bool ubus_connected = false;
  13
  14 static void procd_ubus_connection_lost(struct ubus_context *old_ctx);
  15
  16 static void ubus_proc_cb(struct uloop_process *proc, int ret)
  17 {
  18         /* nothing to do here */
  19 }
  20
  21 static void procd_restart_ubus(void)
  22 {
  23         char *argv[] = { "ubusd", NULL, ubus_socket, NULL };
  24
  25         if (ubus_proc.pending) {
  26                 DPRINTF("Killing existing ubus instance, pid=%d\n", (int) ubus_proc.pid);
  27                 kill(ubus_proc.pid, SIGKILL);
  28                 uloop_process_delete(&ubus_proc);
  29         }
  30
  31         if (ubus_socket)
  32                 argv[1] = "-s";
  33
  34         ubus_proc.pid = fork();
  35         if (!ubus_proc.pid) {
  36                 execvp(argv[0], argv);
  37                 exit(-1);
  38         }
  39
  40         if (ubus_proc.pid <= 0) {
  41                 DPRINTF("Failed to start new ubus instance\n");
  42                 return;
  43         }
  44
  45         DPRINTF("Launched new ubus instance, pid=%d\n", (int) ubus_proc.pid);
  46         uloop_process_add(&ubus_proc);
  47 }
  48
  49 static void procd_ubus_try_connect(void)
  50 {
  51         if (ctx) {
  52                 ubus_connected = !ubus_reconnect(ctx, ubus_socket);
  53                 return;
  54         }
  55
  56         ctx = ubus_connect(ubus_socket);
  57         if (!ctx) {
  58                 DPRINTF("Connection to ubus failed\n");
  59                 return;
  60         }
  61
  62         ctx->connection_lost = procd_ubus_connection_lost;
  63         ubus_connected = true;
  64 }
  65
  66 static void procd_ubus_connection_lost(struct ubus_context *old_ctx)
  67 {
  68         procd_ubus_try_connect();
  69         while (!ubus_connected) {
  70                 procd_restart_ubus();
  71                 sleep(1);
  72                 procd_ubus_try_connect();
  73         }
  74
  75         DPRINTF("Connected to ubus, id=%08x\n", ctx->local_id);
  76         ubus_add_uloop(ctx);
  77 }
  78
  79 void procd_connect_ubus(void)
  80 {
  81         ubus_proc.cb = ubus_proc_cb;
  82         procd_ubus_connection_lost(NULL);
  83 }
  84