mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 05:22:48 +07:00
Implement improved/optimized version of finit
Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
This commit is contained in:
Claudio Matsuoka
@@ -7,13 +7,18 @@ LIBS =
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.c.o:
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$(CC) -c $(CFLAGS) -o $*.o $<
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all: finit
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all: finit finit-mdv
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finit: finit.o
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$(LD) $(LDFLAGS) -o $@ $+ $(LIBS)
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strip $@
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finit-mdv: finit-mdv.o
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$(LD) $(LDFLAGS) -o $@ $+ $(LIBS)
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finit-mdv.o: ffinit.c
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$(CC) -c $(CFLAGS) -DDIST_MDV -o $@ $+
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clean:
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rm -f *.o core *~
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@@ -0,0 +1,306 @@
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/*
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* Improved fast init
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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 <linux/limits.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) close(open((x), O_CREAT|O_WRONLY|O_TRUNC, 0644))
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int makepath(char *p)
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{
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char *x, path[PATH_MAX];
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int ret;
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x = path;
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do {
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do { *x++ = *p++; } while (*p && *p != '/');
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ret = mkdir(path, 0777);
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} while (*p && (*p != '/' || *(p + 1))); /* ignore trailing slash */
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return ret;
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}
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void shutdown(int);
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void signal_handler(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[2096];
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int fd;
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DIR *dir;
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struct dirent *d;
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char filename[1024];
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struct sigaction sa, act;
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char hline[1024];
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char *x;
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sigset_t nmask, nmask2;
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makepath("/usr/local/bin/bla");
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exit(0);
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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, signal_handler, 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, signal_handler, 0);
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SETSIG(sa, SIGKILL, signal_handler, 0);
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SETSIG(sa, SIGALRM, signal_handler, 0);
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SETSIG(sa, SIGHUP, signal_handler, 0);
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SETSIG(sa, SIGSTOP, signal_handler, SA_RESTART);
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SETSIG(sa, SIGCONT, signal_handler, 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, 2095, 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("/mnt", "/", NULL, MS_MOVE, NULL);
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/*
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* Time adjustments
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*/
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if ((fd = open("/etc/adjtime", O_CREAT|O_WRONLY|O_TRUNC, 0644)) >= 0) {
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write(fd, "0.0 0 0.0\n", 10);
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close(fd);
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}
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system("/sbin/hwclock --hctosys --localtime");
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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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sprintf(filename, "/etc/resolvconf/run/interface/%s",
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d->d_name);
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unlink(filename);
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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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system("/bin/run-parts --arg=-i /etc/resolvconf/update.d");
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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(hline, 1023, f);
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if ((x = strchr(hline, 0x0a)) != NULL)
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*x = 0;
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sethostname(hline, strlen(hline));
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fclose(f);
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}
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system("/sbin/ifconfig lo 127.0.0.1 netmask 255.0.0.0 up > /dev/null");
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/*
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* Set random seed
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*/
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/* Bug: the eeepc never sets its random seed from file */
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system("/bin/cat /var/lib/urandom/random-seed >/dev/urandom "
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"> /dev/null 2>&1");
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unlink("/var/lib/urandom/random-seed");
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umask(077);
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system("/bin/dd if=/dev/urandom of=/var/lib/urandom/random-seed "
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"bs=4096 count=1 >/dev/null 2>&1");
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/*
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* Misc setup
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*/
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system("/bin/rm -rf /tmp/* /tmp/.* 2>/dev/null");
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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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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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/* Bug: no signal 0 */
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for (i = 0; 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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system("/sbin/getty 38400 tty3 &");
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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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int fd;
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system("/usr/bin/touch /tmp/shutdown");
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kill(-1, SIGTERM);
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system("/bin/echo -e \"\033[?25l\033[30;40m\"; "
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"/bin/cp /boot/shutdown.b /dev/fb/0");
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sleep(1);
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sleep(1);
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system("/usr/sbin/alsactl store > /dev/null 2>&1");
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system("/sbin/hwclock --systohc --localtime");
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system("/sbin/unionctl.static / --remove / > /dev/null 2>&1");
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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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if ((fd = open("/proc/acpi/sleep", O_WRONLY)) >= 0) {
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write(fd, "5", 1);
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close(fd);
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}
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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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/*
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* We got a signal (PWR TERM ALRM HUP STOP CONT)
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*/
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void signal_handler(int sig)
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{
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/* do nothing */
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}
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