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| -rw-r--r-- | early.c | 87 |
1 files changed, 87 insertions, 0 deletions
@@ -0,0 +1,87 @@ +/* + * 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 "procd.h" + +static void early_mounts(void) +{ + mount("proc", "/proc", "proc", 0, 0); + mount("sysfs", "/sys", "sysfs", 0, 0); + + mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV, "size=512k,mode=1777"); + mkdir("/tmp/run", 0777); + mkdir("/tmp/lock", 0777); + mkdir("/tmp/state", 0777); + symlink("/tmp", "/var"); + + mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755,size=512K"); + mkdir("/dev/shm", 0755); + mkdir("/dev/pts", 0755); + mount("devpts", "/dev/pts", "devpts", 0, 0); +} + +static void early_dev(void) +{ + mkdev("*", 0600); +} + +static void early_console(const char *dev) +{ + struct stat s; + int dd; + + if (stat(dev, &s)) + mkdev("*console", 0600); + + dd = open(dev, O_RDWR); + close(STDIN_FILENO); + close(STDOUT_FILENO); + close(STDERR_FILENO); + + if (dd < 0) { + ERROR("Failed to open %s\n", dev); + return; + } + + dup2(dd, STDIN_FILENO); + dup2(dd, STDOUT_FILENO); + dup2(dd, STDERR_FILENO); + close(dd); +} + +static void early_env(void) +{ + setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin", 1); +} + +void procd_early(void) +{ + if (getpid() != 1) + return; + + early_mounts(); + early_dev(); + early_env(); + early_console("/dev/console"); + + LOG("Console is alive\n"); +} |