7028ff8a4b79e0d5f29573d29855a21b8cae1bf8
[project/procd.git] / initd / early.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/mount.h>
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <sys/sysmacros.h>
19
20 #include <stdio.h>
21 #include <fcntl.h>
22 #include <unistd.h>
23 #include <stdlib.h>
24
25 #include "../utils/utils.h"
26 #include "init.h"
27 #include "../libc-compat.h"
28
29 static void
30 early_dev(void)
31 {
32 mkdev("*", 0600);
33 mknod("/dev/null", 0666, makedev(1, 3));
34 }
35
36 static void
37 early_console(const char *dev)
38 {
39 struct stat s;
40
41 if (stat(dev, &s)) {
42 ERROR("Failed to stat %s\n", dev);
43 return;
44 }
45
46 if (patch_stdio(dev)) {
47 ERROR("Failed to setup i/o redirection\n");
48 return;
49 }
50
51 fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
52 }
53
54 static void
55 early_mounts(void)
56 {
57 unsigned int oldumask = umask(0);
58
59 mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
60 mount("sysfs", "/sys", "sysfs", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
61 mount("cgroup", "/sys/fs/cgroup", "cgroup", MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
62 mount("tmpfs", "/dev", "tmpfs", MS_NOATIME | MS_NOSUID, "mode=0755,size=512K");
63 ignore(symlink("/tmp/shm", "/dev/shm"));
64 mkdir("/dev/pts", 0755);
65 mount("devpts", "/dev/pts", "devpts", MS_NOATIME | MS_NOEXEC | MS_NOSUID, "mode=600");
66 early_dev();
67
68 early_console("/dev/console");
69 if (mount_zram_on_tmp()) {
70 mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, 0);
71 mkdir("/tmp/shm", 01777);
72 } else {
73 mkdir("/tmp/shm", 01777);
74 mount("tmpfs", "/tmp/shm", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME,
75 "mode=01777");
76 }
77 mkdir("/tmp/run", 0755);
78 mkdir("/tmp/lock", 0755);
79 mkdir("/tmp/state", 0755);
80 umask(oldumask);
81 }
82
83 static void
84 early_env(void)
85 {
86 setenv("PATH", EARLY_PATH, 1);
87 }
88
89 void
90 early(void)
91 {
92 if (getpid() != 1)
93 return;
94
95 early_mounts();
96 early_env();
97
98 LOG("Console is alive\n");
99 }