diff options
author | John Crispin <blogic@openwrt.org> | 2013-11-14 13:41:13 +0100 |
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committer | John Crispin <blogic@openwrt.org> | 2013-11-15 17:05:20 +0100 |
commit | 916f95cb58604038695347ee41a430d8ca1f0556 (patch) | |
tree | 5dbb52a6adaf28c6c6989ea37e6975aa52075160 /initd/early.c | |
parent | f9d31edb8938341b9217ee4c14eb58111414eb97 (diff) | |
download | unitd-916f95cb58604038695347ee41a430d8ca1f0556.tar unitd-916f95cb58604038695347ee41a430d8ca1f0556.zip |
debloat and reorganize code
split app into procd and init binaries
remove log support, this is an external service now
Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'initd/early.c')
-rw-r--r-- | initd/early.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/initd/early.c b/initd/early.c new file mode 100644 index 0000000..77ced77 --- /dev/null +++ b/initd/early.c @@ -0,0 +1,95 @@ +/* + * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> + * Copyright (C) 2013 John Crispin <blogic@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <sys/mount.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> + +#include "../log.h" +#include "init.h" + +static void +early_mounts(void) +{ + mount("proc", "/proc", "proc", MS_NOATIME, 0); + mount("sysfs", "/sys", "sysfs", MS_NOATIME, 0); + + mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, NULL); + mkdir("/tmp/run", 0777); + mkdir("/tmp/lock", 0777); + mkdir("/tmp/state", 0777); + symlink("/tmp", "/var"); + + mount("tmpfs", "/dev", "tmpfs", MS_NOATIME, "mode=0755,size=512K"); + mkdir("/dev/shm", 0755); + mkdir("/dev/pts", 0755); + mount("devpts", "/dev/pts", "devpts", MS_NOATIME, "mode=600"); +} + +static void +early_dev(void) +{ + mkdev("*", 0600); + mknod("/dev/null", 0666, makedev(1, 3)); +} + +static void +early_console(const char *dev) +{ + struct stat s; + int dd; + + if (stat(dev, &s)) { + ERROR("Failed to stat %s\n", dev); + return; + } + + dd = open(dev, O_RDWR); + if (dd < 0) + dd = open("/dev/null", O_RDWR); + + dup2(dd, STDIN_FILENO); + dup2(dd, STDOUT_FILENO); + dup2(dd, STDERR_FILENO); + + if (dd != STDIN_FILENO && + dd != STDOUT_FILENO && + dd != STDERR_FILENO) + close(dd); +} + +static void +early_env(void) +{ + setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin", 1); +} + +void +early(void) +{ + if (getpid() != 1) + return; + + early_mounts(); + early_dev(); + early_env(); + early_console("/dev/console"); + + LOG("Console is alive\n"); +} |