12df421bb205c4074a4f08af4493bec3d9d37891
[project/procd.git] / plug / coldplug.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/mount.h>
18
19 #include <unistd.h>
20
21 #include "../procd.h"
22 #include "../libc-compat.h"
23
24 #include "hotplug.h"
25 #include "../container.h"
26
27 static struct uloop_process udevtrigger;
28
29 static void coldplug_complete(struct uloop_timeout *t)
30 {
31 DEBUG(4, "Coldplug complete\n");
32 hotplug_last_event(NULL);
33 procd_state_next();
34 }
35
36 static void udevtrigger_complete(struct uloop_process *proc, int ret)
37 {
38 DEBUG(4, "Finished udevtrigger\n");
39 hotplug_last_event(coldplug_complete);
40 }
41
42 void procd_coldplug(void)
43 {
44 char *argv[] = { "udevtrigger", NULL };
45 unsigned int oldumask = umask(0);
46
47 if (!is_container()) {
48 umount2("/dev/pts", MNT_DETACH);
49 umount2("/dev/", MNT_DETACH);
50 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755,size=512K");
51 mkdir("/dev/pts", 0755);
52 mount("devpts", "/dev/pts", "devpts", MS_NOEXEC | MS_NOSUID, 0);
53 }
54
55 ignore(symlink("/tmp/shm", "/dev/shm"));
56 umask(oldumask);
57 udevtrigger.cb = udevtrigger_complete;
58 udevtrigger.pid = fork();
59 if (!udevtrigger.pid) {
60 execvp(argv[0], argv);
61 ERROR("Failed to start coldplug: %m\n");
62 exit(-1);
63 }
64
65 if (udevtrigger.pid <= 0) {
66 ERROR("Failed to start new coldplug instance: %m\n");
67 return;
68 }
69
70 uloop_process_add(&udevtrigger);
71
72 DEBUG(4, "Launched coldplug instance, pid=%d\n", (int) udevtrigger.pid);
73 }