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Sources/procd/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 <stdlib.h>
 20 #include <unistd.h>
 21 
 22 #include "../procd.h"
 23 #include "../libc-compat.h"
 24 
 25 #include "hotplug.h"
 26 #include "../container.h"
 27 
 28 static struct uloop_process udevtrigger;
 29 
 30 static void coldplug_complete(struct uloop_timeout *t)
 31 {
 32         DEBUG(4, "Coldplug complete\n");
 33         hotplug_last_event(NULL);
 34         procd_state_next();
 35 }
 36 
 37 static void udevtrigger_complete(struct uloop_process *proc, int ret)
 38 {
 39         DEBUG(4, "Finished udevtrigger\n");
 40         hotplug_last_event(coldplug_complete);
 41 }
 42 
 43 void procd_coldplug(void)
 44 {
 45         char *argv[] = { "udevtrigger", NULL };
 46         unsigned int oldumask = umask(0);
 47 
 48         if (!is_container()) {
 49                 umount2("/dev/pts", MNT_DETACH);
 50                 umount2("/dev/", MNT_DETACH);
 51                 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755,size=512K");
 52                 mkdir("/dev/pts", 0755);
 53                 mount("devpts", "/dev/pts", "devpts", MS_NOEXEC | MS_NOSUID, 0);
 54         }
 55 
 56         ignore(symlink("/tmp/shm", "/dev/shm"));
 57         umask(oldumask);
 58         udevtrigger.cb = udevtrigger_complete;
 59         udevtrigger.pid = fork();
 60         if (!udevtrigger.pid) {
 61                 execvp(argv[0], argv);
 62                 ERROR("Failed to start coldplug: %m\n");
 63                 exit(EXIT_FAILURE);
 64         }
 65 
 66         if (udevtrigger.pid <= 0) {
 67                 ERROR("Failed to start new coldplug instance: %m\n");
 68                 return;
 69         }
 70 
 71         uloop_process_add(&udevtrigger);
 72 
 73         DEBUG(4, "Launched coldplug instance, pid=%d\n", (int) udevtrigger.pid);
 74 }
 75 

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