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Archive previous versions for reference.
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
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/*
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Improved fast init
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Copyright (c) 2008 Claudio Matsuoka
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/*
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Changelog from the original Eeepc fastinit:
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- Use mknod() instead of close(open()) call to create empty file
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- Fix random seed initialization
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- Don't try to handle signal 0, SIGKILL or SIGSTOP
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- Implement makepath() to avoid system("mkdir -p")
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- Omit first hwclock if user has CONFIG_RTC_HCTOSYS in kernel (by Metalshark)
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- Add –directisa to hwclock if user has disabled CONFIG_GENRTC and enabled
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CONFIG_RTC but not CONFIG_HPET_TIMER and CONFIG_HPET_RTC_IRQ (by Metalshark)
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- Drop system() call to clean /tmp, it's a fresh mounted tmpfs
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- Set loopback interface using direct calls instead of system("ifconfig")
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- Copy 4096 data block in C instead of system("cat") or system("dd")
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- Draw shutdown splash screen using C calls instead of system("echo;cat")
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- Change poweroff method to reboot(RB_POWER_OFF) (by Metalshark)
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- Mount /var/run and /var/lock as tmpfs
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- Use SIG_IGN instead of empty signal handler (by Metalshark)
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- Add built-in run-parts option to be used instead of system("run-parts")
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- Reuse cmdline buffer as hostname and filename buffers
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- Open terminal in vt2 using openvt
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/reboot.h>
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#include <sys/wait.h>
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#include <linux/fs.h>
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#include "helpers.h"
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/* From sysvinit */
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/* Set a signal handler. */
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#define SETSIG(sa, sig, fun, flags) \
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do { \
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sa.sa_handler = fun; \
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sa.sa_flags = flags; \
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sigemptyset(&sa.sa_mask); \
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sigaction(sig, &sa, NULL); \
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} while (0)
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#define touch(x) mknod((x), S_IFREG|0644, 0)
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#define LINE_SIZE 1024
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void shutdown(int);
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void chld_handler(int);
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int main()
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{
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int i;
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FILE *f;
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char line[LINE_SIZE];
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int fd;
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DIR *dir;
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struct dirent *d;
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struct sigaction sa, act;
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char *x;
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sigset_t nmask, nmask2;
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puts("finit-mod " VERSION " (built " __DATE__ " " __TIME__
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" by " WHOAMI ")");
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chdir("/");
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umask(022);
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/*
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* Signal management
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*/
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for (i = 1; i < NSIG; i++)
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SETSIG(sa, i, SIG_IGN, SA_RESTART);
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SETSIG(sa, SIGINT, shutdown, 0);
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SETSIG(sa, SIGPWR, SIG_IGN, 0);
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SETSIG(sa, SIGUSR1, shutdown, 0);
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SETSIG(sa, SIGUSR2, shutdown, 0);
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SETSIG(sa, SIGTERM, SIG_IGN, 0);
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SETSIG(sa, SIGALRM, SIG_IGN, 0);
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SETSIG(sa, SIGHUP, SIG_IGN, 0);
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SETSIG(sa, SIGCONT, SIG_IGN, SA_RESTART);
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SETSIG(sa, SIGCHLD, chld_handler, SA_RESTART);
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/* Block sigchild while forking */
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sigemptyset(&nmask);
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sigaddset(&nmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &nmask, NULL);
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reboot(RB_DISABLE_CAD);
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/*
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* Parse kernel parameters
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*/
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if ((f = fopen("/proc/cmdline", "r")) != NULL) {
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fgets(line, LINE_SIZE, f);
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if (strstr(line, "quiet")) {
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close(0);
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close(1);
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close(2);
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}
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fclose(f);
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}
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setsid();
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/*
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* Mount filesystems
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*/
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mount("proc", "/proc", "proc", 0, NULL);
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mount("sysfs", "/sys", "sysfs", 0, NULL);
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mount("devpts", "/dev/pts", "devpts", 0, "gid=5,mode=620");
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mount("tmpfs", "/dev/shm", "tmpfs", 0, NULL);
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mount("tmpfs", "/tmp", "tmpfs", 0, "mode=1777,size=128m");
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mount("tmpfs", "/var/run", "tmpfs", 0, "mode=0755");
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mount("tmpfs", "/var/lock", "tmpfs", 0, "mode=1777");
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mount("/mnt", "/", NULL, MS_MOVE, NULL);
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/*
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* Time adjustments
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*/
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#ifndef NO_HCTOSYS
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system("/sbin/hwclock --hctosys");
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#endif
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/*
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* Network stuff
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*/
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makepath("/dev/shm/network");
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makepath("/dev/shm/resolvconf/interface");
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if ((dir = opendir("/etc/resolvconf/run/interface")) != NULL) {
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while ((d = readdir(dir)) != NULL) {
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if (isalnum(d->d_name[0]))
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continue;
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snprintf(line, LINE_SIZE,
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"/etc/resolvconf/run/interface/%s", d->d_name);
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unlink(line);
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}
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closedir(dir);
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}
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touch("/var/run/utmp");
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touch("/etc/resolvconf/run/enable-updates");
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chdir("/etc/resolvconf/run/interface");
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#ifdef BUILTIN_RUNPARTS
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run_parts("/etc/resolvconf/update.d", "-i", NULL);
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#else
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system("/bin/run-parts --arg=-i /etc/resolvconf/update.d");
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#endif
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chdir("/");
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touch("/etc/network/run/ifstate");
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if ((f = fopen("/etc/hostname", "r")) != NULL) {
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fgets(line, LINE_SIZE, f);
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if ((x = strchr(line, 0x0a)) != NULL)
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*x = 0;
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sethostname(line, strlen(line));
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fclose(f);
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}
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ifconfig("lo", "127.0.0.1", "255.0.0.0", 1);
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/*
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* Set random seed
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*/
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copyfile("/var/lib/urandom/random-seed", "/dev/urandom", 0);
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unlink("/var/lib/urandom/random-seed");
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umask(077);
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copyfile("/dev/urandom", "/var/lib/urandom/random-seed", 4096);
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/*
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* Misc setup
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*/
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unlink("/var/run/.clean");
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unlink("/var/lock/.clean");
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umask(0);
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mkdir("/tmp/.X11-unix", 01777);
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mkdir("/tmp/.ICE-unix", 01777);
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umask(022);
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system("/usr/bin/openvt /sbin/getty 38400 tty2&");
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if (!fork()) {
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/* child process */
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vhangup();
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close(2);
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close(1);
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close(0);
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if (open("/dev/tty1", O_RDWR) != 0)
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exit(1);
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sigemptyset(&act.sa_mask);
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act.sa_handler = SIG_DFL;
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sigemptyset(&nmask2);
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sigaddset(&nmask2, SIGCHLD);
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sigprocmask(SIG_UNBLOCK, &nmask2, NULL);
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for (i = 1; i < NSIG; i++)
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sigaction(i, &sa, NULL);
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dup2(0, 0);
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dup2(0, 1);
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dup2(0, 2);
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touch("/tmp/nologin");
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while (access("/tmp/shutdown", F_OK) < 0)
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system("su -c startx -l user &> /dev/null");
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exit(0);
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}
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/* parent process */
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sleep(1);
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system("/usr/sbin/services.sh &>/dev/null&");
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while (1) {
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sigemptyset(&nmask);
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pselect(0, NULL, NULL, NULL, NULL, &nmask);
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}
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}
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/*
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* Shut down on INT USR1 USR2
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*/
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void shutdown(int sig)
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{
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touch("/tmp/shutdown");
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kill(-1, SIGTERM);
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write(1, "\033[?25l\033[30;40m", 14);
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copyfile("/boot/shutdown.fb", "/dev/fb/0", 0);
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sleep(2);
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system("/usr/sbin/alsactl store > /dev/null 2>&1");
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system("/sbin/hwclock --systohc");
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kill(-1, SIGKILL);
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sync();
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sync();
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system("/bin/mount -n -o remount,ro /");
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system("/sbin/unionctl.static / --remove / > /dev/null 2>&1");
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if (sig == SIGINT || sig == SIGUSR1)
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reboot(RB_AUTOBOOT);
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reboot(RB_POWER_OFF);
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}
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/*
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* SIGCHLD: one of our children has died
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*/
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void chld_handler(int sig)
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{
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int status;
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while (waitpid(-1, &status, WNOHANG) != 0) {
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if (errno == ECHILD)
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break;
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}
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}
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