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minit, a Minimal init system.

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This commit is contained in:
Glenn L McGrath 2003-05-11 14:52:39 +00:00
parent 8c6887c855
commit 1e11c34be4
7 changed files with 1051 additions and 0 deletions
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9
include/applets.h
View File

@ -358,6 +358,9 @@
#ifdef CONFIG_MESG
APPLET(mesg, mesg_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_MINIT
APPLET(minit, minit_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_MKDIR
APPLET(mkdir, mkdir_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
@ -388,6 +391,9 @@
#ifdef CONFIG_MSH
APPLET_NOUSAGE("msh", msh_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_MSVC
APPLET(msvc, msvc_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_MT
APPLET(mt, mt_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
@ -415,6 +421,9 @@
#ifdef CONFIG_PASSWD
APPLET(passwd, passwd_main, _BB_DIR_USR_BIN, _BB_SUID_ALWAYS)
#endif
#ifdef CONFIG_PIDFILEHACK
APPLET(pidfilehack, pidfilehack_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_PIDOF
APPLET(pidof, pidof_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif

29
include/usage.h
View File

@ -1430,6 +1430,11 @@
"\ty\tAllow write access to your terminal.\n" \
"\tn\tDisallow write access to your terminal.\n"
#define minit_trivial_usage \
"[-spPrRC]"
#define minit_full_usage \
"[-spPrRC]"
#define mkdir_trivial_usage \
"[OPTION] DIRECTORY..."
#define mkdir_full_usage \
@ -1559,6 +1564,25 @@
"$ mount /dev/fd0 /mnt -t msdos -o ro\n" \
"$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
#define msvc_trivial_usage \
"-[udorspchaitkx] service"
#define msvc_full_usafe \
"[option] service\n" \
"Where option is one of\n" \
"\t-u\tUp. If the service is not running, start it. If the service stops, restart it.\n" \
"\t-d\tDown. If the service is running, stop it, do not restart it.\n" \
"\t-o\tOnce. If the service is not running, start it. Do not restart it if it stops.\n" \
"\t-r\tTell supervise that the service is normally running; this affects status messages.\n" \
"\t-s\tTell supervise that the service is normally stopped; this affects status messages.\n" \
"\t-p\tPause. Send the service a STOP signal.\n" \
"\t-c\tContinue. Send the service a CONT signal.\n" \
"\t-h\tHangup. Send the service a HUP signal.\n" \
"\t-a\tAlarm. Send the service an ALRM signal.\n" \
"\t-i\tInterrupt. Send the service an INT signal.\n" \
"\t-t\tTerminate. Send the service a TERM signal.\n" \
"\t-k\tKill. Send the service a KILL signal.\n" \
"\t-x\tExit. supervise will quit as soon as the service is down.\n"
#define mt_trivial_usage \
"[-f device] opcode value"
#define mt_full_usage \
@ -1666,6 +1690,11 @@
"\t-l\tLocks (disables) the specified user account.\n" \
"\t-u\tUnlocks (re-enables) the specified user account."
#define pidfilehack_trivial_usage \
"[daemon.pid] [daemon]"
#define pidfilehack_full_usage \
"service /var/run/daemon.pid /usr/sbin/daemon args...\n"
#define pidof_trivial_usage \
"process-name [process-name ...]"
#define pidof_full_usage \

20
init/Config.in
View File

@ -61,6 +61,26 @@ config CONFIG_REBOOT
help
Please submit a patch to add help text for this item.
config CONFIG_MINIT
bool "minit"
default n
help
Minimal init, based on minit v0.9.1
config CONFIG_PIDFILEHACK
bool "pidfilehack"
default y
depends on CONFIG_MINIT
help
pidfilehack is used by minit to run servers.
config CONFIG_MSVC
bool "msvc"
default y
depends on CONFIG_MINIT
help
msvc is used to start and stop processes controlled by minit
# Should start-stop-daemon be moved under debianutils?
config CONFIG_START_STOP_DAEMON
bool "start-stop-daemon"

3
init/Makefile.in
View File

@ -26,6 +26,9 @@ INIT-y:=
INIT-$(CONFIG_HALT) += halt.o
INIT-$(CONFIG_INIT) += init.o
INIT-$(CONFIG_MESG) += mesg.o
INIT-$(CONFIG_MINIT) += minit.o
INIT-$(CONFIG_MSVC) += msvc.o
INIT-$(CONFIG_PIDFILEHACK) += pidfilehack.o
INIT-$(CONFIG_POWEROFF) += poweroff.o
INIT-$(CONFIG_REBOOT) += reboot.o
INIT-$(CONFIG_START_STOP_DAEMON) += start_stop_daemon.o

612
init/minit.c Normal file
View File

@ -0,0 +1,612 @@
/*
* minit version 0.9.1 by Felix von Leitner
* ported to busybox by Glenn McGrath <bug1@optushome.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <time.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/reboot.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <linux/kd.h>
#include "busybox.h"
#define MINITROOT "/etc/minit"
static int i_am_init;
static int infd, outfd;
extern char **environ;
static struct process {
char *name;
pid_t pid;
char respawn;
char circular;
time_t startedat;
int __stdin, __stdout;
int logservice;
} *root;
static int maxprocess = -1;
static int processalloc = 0;
static unsigned int fmt_ulong(char *dest, unsigned long i)
{
register unsigned long len, tmp, len2;
/* first count the number of bytes needed */
for (len = 1, tmp = i; tmp > 9; ++len)
tmp /= 10;
if (dest)
for (tmp = i, dest += len, len2 = len + 1; --len2; tmp /= 10)
*--dest = (tmp % 10) + '0';
return len;
}
/* split buf into n strings that are separated by c. return n as *len.
* Allocate plus more slots and leave the first ofs of them alone. */
static char **split(char *buf, int c, int *len, int plus, int ofs)
{
int n = 1;
char **v = 0;
char **w;
/* step 1: count tokens */
char *s;
for (s = buf; *s; s++)
if (*s == c)
n++;
/* step 2: allocate space for pointers */
v = (char **) malloc((n + plus) * sizeof(char *));
if (!v)
return 0;
w = v + ofs;
*w++ = buf;
for (s = buf;; s++) {
while (*s && *s != c)
s++;
if (*s == 0)
break;
if (*s == c) {
*s = 0;
*w++ = s + 1;
}
}
*len = w - v;
return v;
}
static int openreadclose(char *fn, char **buf, unsigned long *len)
{
int fd = open(fn, O_RDONLY);
if (fd < 0)
return -1;
if (!*buf) {
*len = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
*buf = (char *) malloc(*len + 1);
if (!*buf) {
close(fd);
return -1;
}
}
*len = read(fd, *buf, *len);
if (*len != (unsigned long) -1)
(*buf)[*len] = 0;
return close(fd);
}
/* return index of service in process data structure or -1 if not found */
static int findservice(char *service)
{
int i;
for (i = 0; i <= maxprocess; i++) {
if (!strcmp(root[i].name, service))
return i;
}
return -1;
}
/* look up process index in data structure by PID */
static int findbypid(pid_t pid)
{
int i;
for (i = 0; i <= maxprocess; i++) {
if (root[i].pid == pid)
return i;
}
return -1;
}
/* clear circular dependency detection flags */
static void circsweep(void)
{
int i;
for (i = 0; i <= maxprocess; i++)
root[i].circular = 0;
}
/* add process to data structure, return index or -1 */
static int addprocess(struct process *p)
{
if (maxprocess + 1 >= processalloc) {
struct process *fump;
processalloc += 8;
if ((fump =
(struct process *) xrealloc(root,
processalloc *
sizeof(struct process))) == 0)
return -1;
root = fump;
}
memmove(&root[++maxprocess], p, sizeof(struct process));
return maxprocess;
}
/* load a service into the process data structure and return index or -1
* if failed */
static int loadservice(char *service)
{
struct process tmp;
int fd;
if (*service == 0)
return -1;
fd = findservice(service);
if (fd >= 0)
return fd;
if (chdir(MINITROOT) || chdir(service))
return -1;
if (!(tmp.name = strdup(service)))
return -1;
tmp.pid = 0;
fd = open("respawn", O_RDONLY);
if (fd >= 0) {
tmp.respawn = 1;
close(fd);
} else
tmp.respawn = 0;
tmp.startedat = 0;
tmp.circular = 0;
tmp.__stdin = 0;
tmp.__stdout = 1;
{
char *logservice = alloca(strlen(service) + 5);
strcpy(logservice, service);
strcat(logservice, "/log");
tmp.logservice = loadservice(logservice);
if (tmp.logservice >= 0) {
int pipefd[2];
if (pipe(pipefd))
return -1;
root[tmp.logservice].__stdin = pipefd[0];
tmp.__stdout = pipefd[1];
}
}
return (addprocess(&tmp));
}
/* usage: isup(findservice("sshd")).
* returns nonzero if process is up */
static int isup(int service)
{
if (service < 0)
return 0;
return (root[service].pid != 0);
}
static void opendevconsole(void)
{
int fd;
if ((fd = open("/dev/console", O_RDWR | O_NOCTTY)) >= 0) {
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
}
/* called from inside the service directory, return the PID or 0 on error */
static pid_t forkandexec(int pause_flag, int service)
{
char **argv = 0;
int count = 0;
pid_t p;
int fd;
unsigned long len;
char *s = 0;
int argc;
char *argv0 = 0;
again:
switch (p = fork()) {
case (pid_t) - 1:
if (count > 3)
return 0;
sleep(++count * 2);
goto again;
case 0:
/* child */
if (i_am_init) {
ioctl(0, TIOCNOTTY, 0);
setsid();
opendevconsole();
tcsetpgrp(0, getpgrp());
}
close(infd);
close(outfd);
if (pause_flag) {
struct timespec req;
req.tv_sec = 0;
req.tv_nsec = 500000000;
nanosleep(&req, 0);
}
if (!openreadclose("params", &s, &len)) {
argv = split(s, '\n', &argc, 2, 1);
if (argv[argc - 1])
argv[argc - 1] = 0;
else
argv[argc] = 0;
} else {
argv = (char **) xmalloc(2 * sizeof(char *));
argv[1] = 0;
}
argv0 = (char *) xmalloc(PATH_MAX + 1);
if (!argv || !argv0)
goto abort;
if (readlink("run", argv0, PATH_MAX) < 0) {
if (errno != EINVAL)
goto abort; /* not a symbolic link */
argv0 = strdup("./run");
}
argv[0] = strrchr(argv0, '/');
if (argv[0])
argv[0]++;
else
argv[0] = argv0;
if (root[service].__stdin != 0)
dup2(root[service].__stdin, 0);
if (root[service].__stdout != 1) {
dup2(root[service].__stdout, 1);
dup2(root[service].__stdout, 2);
}
{
int i;
for (i = 3; i < 1024; ++i)
close(i);
}
execve(argv0, argv, environ);
_exit(0);
abort:
free(argv0);
free(argv);
_exit(0);
default:
fd = open("sync", O_RDONLY);
if (fd >= 0) {
pid_t p2;
close(fd);
p2 = waitpid(p, 0, 0);
return 1;
}
return p;
}
}
/* start a service, return nonzero on error */
static int startnodep(int service, int pause_flag)
{
/* step 1: see if the process is already up */
if (isup(service))
return 0;
/* step 2: fork and exec service, put PID in data structure */
if (chdir(MINITROOT) || chdir(root[service].name))
return -1;
root[service].startedat = time(0);
root[service].pid = forkandexec(pause_flag, service);
return root[service].pid;
}
static int startservice(int service, int pause_flag)
{
int dir = -1;
unsigned long len;
char *s = 0;
pid_t pid;
if (service < 0)
return 0;
if (root[service].circular)
return 0;
root[service].circular = 1;
if (root[service].logservice >= 0)
startservice(root[service].logservice, pause_flag);
if (chdir(MINITROOT) || chdir(root[service].name))
return -1;
if ((dir = open(".", O_RDONLY)) >= 0) {
if (!openreadclose("depends", &s, &len)) {
char **deps;
int depc, i;
deps = split(s, '\n', &depc, 0, 0);
for (i = 0; i < depc; i++) {
int service_index;
if (deps[i][0] == '#')
continue;
service_index = loadservice(deps[i]);
if (service_index >= 0 && root[service_index].pid != 1)
startservice(service_index, 0);
}
fchdir(dir);
}
pid = startnodep(service, pause_flag);
close(dir);
dir = -1;
return pid;
}
return 0;
}
static void sulogin(void)
{
/* exiting on an initialization failure is not a good idea for init */
char *argv[] = { "sulogin", 0 };
execve("/sbin/sulogin", argv, environ);
exit(1);
}
static void handlekilled(pid_t killed)
{
int i;
if (killed == (pid_t) - 1) {
write(2, "all services exited.\n", 21);
exit(0);
}
if (killed == 0)
return;
i = findbypid(killed);
if (i >= 0) {
root[i].pid = 0;
if (root[i].respawn) {
circsweep();
startservice(i, time(0) - root[i].startedat < 1);
} else {
root[i].startedat = time(0);
root[i].pid = 1;
}
}
}
static void childhandler(void)
{
int status;
pid_t killed;
do {
killed = waitpid(-1, &status, WNOHANG);
handlekilled(killed);
} while (killed && killed != (pid_t) - 1);
}
static volatile int dowinch = 0;
static volatile int doint = 0;
static void sigchild(int whatever)
{
}
static void sigwinch(int sig)
{
dowinch = 1;
}
static void sigint(int sig)
{
doint = 1;
}
extern int minit_main(int argc, char *argv[])
{
/* Schritt 1: argv[1] als Service nehmen und starten */
struct pollfd pfd;
time_t last = time(0);
int nfds = 1;
int count = 0;
int i;
infd = open("/etc/minit/in", O_RDWR);
outfd = open("/etc/minit/out", O_RDWR | O_NONBLOCK);
if (getpid() == 1) {
int fd;
i_am_init = 1;
reboot(0);
if ((fd = open("/dev/console", O_RDWR | O_NOCTTY))) {
ioctl(fd, KDSIGACCEPT, SIGWINCH);
close(fd);
} else
ioctl(0, KDSIGACCEPT, SIGWINCH);
}
/* signal(SIGPWR,sighandler); don't know what to do about it */
/* signal(SIGHUP,sighandler); ??? */
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = 0;
sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
sa.sa_handler = sigchild;
sigaction(SIGCHLD, &sa, 0);
sa.sa_handler = sigint;
sigaction(SIGINT, &sa, 0); /* ctrl-alt-del */
sa.sa_handler = sigwinch;
sigaction(SIGWINCH, &sa, 0); /* keyboard request */
}
if (infd < 0 || outfd < 0) {
puts("minit: could not open /etc/minit/in or /etc/minit/out\n");
sulogin();
nfds = 0;
} else
pfd.fd = infd;
pfd.events = POLLIN;
for (i = 1; i < argc; i++) {
circsweep();
if (startservice(loadservice(argv[i]), 0))
count++;
}
circsweep();
if (!count)
startservice(loadservice("default"), 0);
for (;;) {
char buf[1501];
time_t now;
if (doint) {
doint = 0;
startservice(loadservice("ctrlaltdel"), 0);
}
if (dowinch) {
dowinch = 0;
startservice(loadservice("kbreq"), 0);
}
childhandler();
now = time(0);
if (now < last || now - last > 30) {
/* The system clock was reset. Compensate. */
long diff = last - now;
int j;
for (j = 0; j <= maxprocess; ++j) {
root[j].startedat -= diff;
}
}
last = now;
switch (poll(&pfd, nfds, 5000)) {
case -1:
if (errno == EINTR) {
childhandler();
break;
}
opendevconsole();
puts("poll failed!\n");
sulogin();
/* what should we do if poll fails?! */
break;
case 1:
i = read(infd, buf, 1500);
if (i > 1) {
pid_t pid;
int idx = 0;
int tmp;
buf[i] = 0;
if (buf[0] != 's' && ((idx = findservice(buf + 1)) < 0))
error:
write(outfd, "0", 1);
else {
switch (buf[0]) {
case 'p':
write(outfd, buf, fmt_ulong(buf, root[idx].pid));
break;
case 'r':
root[idx].respawn = 0;
goto ok;
case 'R':
root[idx].respawn = 1;
goto ok;
case 'C':
if (kill(root[idx].pid, 0)) { /* check if still active */
handlekilled(root[idx].pid); /* no!?! remove form active list */
goto error;
}
goto ok;
break;
case 'P':
{
unsigned char *x = buf + strlen(buf) + 1;
unsigned char c;
tmp = 0;
while ((c = *x++ - '0') < 10)
tmp = tmp * 10 + c;
}
if (tmp > 0) {
if (kill(tmp, 0))
goto error;
pid = tmp;
}
root[idx].pid = tmp;
goto ok;
case 's':
idx = loadservice(buf + 1);
if (idx < 0)
goto error;
if (root[idx].pid < 2) {
root[idx].pid = 0;
circsweep();
idx = startservice(idx, 0);
if (idx == 0) {
write(outfd, "0", 1);
break;
}
}
ok:
write(outfd, "1", 1);
break;
case 'u':
write(outfd, buf,
fmt_ulong(buf, time(0) - root[idx].startedat));
}
}
}
break;
default:
break;
}
}
}

300
init/msvc.c Normal file
View File

@ -0,0 +1,300 @@
/*
* minit version 0.9.1 by Felix von Leitner
* ported to busybox by Glenn McGrath <bug1@optushome.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <sys/fcntl.h>
#include <sys/file.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "busybox.h"
static int infd, outfd;
static char buf[1500];
static unsigned int fmt_ulong(char *dest, unsigned long i)
{
register unsigned long len, tmp, len2;
/* first count the number of bytes needed */
for (len = 1, tmp = i; tmp > 9; ++len)
tmp /= 10;
if (dest)
for (tmp = i, dest += len, len2 = len + 1; --len2; tmp /= 10)
*--dest = (tmp % 10) + '0';
return len;
}
static void addservice(char *service)
{
char *service_ptr;
if (strncmp(service, "/etc/minit/", 11) == 0) {
service += 11;
}
while ((service_ptr = last_char_is(service, '/')) != NULL) {
*service_ptr = 0;
}
strncpy(buf + 1, service, 1400);
buf[1400] = 0;
}
static int addreadwrite(char *service)
{
addservice(service);
write(infd, buf, strlen(buf));
return read(outfd, buf, 1500);
}
/* return PID, 0 if error */
static pid_t __readpid(char *service)
{
int len;
buf[0] = 'p';
len = addreadwrite(service);
if (len < 0)
return 0;
buf[len] = 0;
return atoi(buf);
}
/* return nonzero if error */
static int respawn(char *service, int yesno)
{
int len;
buf[0] = yesno ? 'R' : 'r';
len = addreadwrite(service);
return (len != 1 || buf[0] == '0');
}
/* return nonzero if error */
static int startservice(char *service)
{
int len;
buf[0] = 's';
len = addreadwrite(service);
return (len != 1 || buf[0] == '0');
}
extern int msvc_main(int argc, char **argv)
{
if (argc < 2) {
bb_show_usage();
}
infd = bb_xopen("/etc/minit/in", O_WRONLY);
outfd = bb_xopen("/etc/minit/out", O_RDONLY);
while (lockf(infd, F_LOCK, 1)) {
bb_perror_msg("could not aquire lock!\n");
sleep(1);
}
if (argc == 2) {
pid_t pid = __readpid(argv[1]);
if (buf[0] != '0') {
int len;
int up_time;
printf("%s: ", argv[1]);
if (pid == 0)
printf("down ");
else if (pid == 1)
printf("finished ");
else {
printf("up (pid %d) ", pid);
}
buf[0] = 'u';
len = addreadwrite(argv[1]);
if (len < 0) {
up_time = 0;
} else {
buf[len] = 0;
up_time = atoi(buf);
}
printf("%d seconds\n", up_time);
if (pid == 0)
return 2;
else if (pid == 1)
return 3;
else
return 0;
} else {
bb_error_msg_and_die("no such service");
}
} else {
int i;
int ret = 0;
int sig = 0;
pid_t pid;
if (argv[1][0] == '-') {
switch (argv[1][1]) {
case 'g':
for (i = 2; i < argc; ++i) {
pid = __readpid(argv[i]);
if (pid < 2) {
if (pid == 1) {
bb_error_msg("%s, service termination", argv[i]);
} else {
bb_error_msg("%s, no such service", argv[i]);
}
ret = 1;
}
printf("%d\n", pid);
}
break;
case 'p':
sig = SIGSTOP;
goto dokill;
break;
case 'c':
sig = SIGCONT;
goto dokill;
break;
case 'h':
sig = SIGHUP;
goto dokill;
break;
case 'a':
sig = SIGALRM;
goto dokill;
break;
case 'i':
sig = SIGINT;
goto dokill;
break;
case 't':
sig = SIGTERM;
goto dokill;
break;
case 'k':
sig = SIGKILL;
goto dokill;
break;
case 'o':
for (i = 2; i < argc; ++i)
if (startservice(argv[i]) || respawn(argv[i], 0)) {
bb_error_msg("Couldnt not start %s\n", argv[i]);
ret = 1;
}
break;
case 'd':
for (i = 2; i < argc; ++i) {
pid = __readpid(argv[i]);
if (pid == 0) {
bb_error_msg("%s, no such service\n", argv[i]);
ret = 1;
} else if (pid == 1)
continue;
if (respawn(argv[i], 0) || kill(pid, SIGTERM)
|| kill(pid, SIGCONT));
}
break;
case 'u':
for (i = 2; i < argc; ++i) {
if (startservice(argv[i]) || respawn(argv[i], 1)) {
bb_error_msg("Couldnt not start %s\n", argv[i]);
ret = 1;
}
break;
}
case 'C':
for (i = 2; i < argc; ++i) {
int len;
buf[0] = 'C';
len = addreadwrite(argv[i]);
if (len != 1 || buf[0] == '0') {
bb_error_msg("%s has terminated or was killed\n",
argv[i]);
ret = 1;
}
}
break;
case 'P':
pid = atoi(argv[1] + 2);
if (pid > 1) {
char *tmp;
int len;
buf[0] = 'P';
addservice(argv[2]);
tmp = buf + strlen(buf) + 1;
tmp[fmt_ulong(tmp, pid)] = 0;
write(infd, buf, strlen(buf) + strlen(tmp) + 2);
len = read(outfd, buf, 1500);
if (len != 1 || buf[0] == '0') {
bb_error_msg_and_die("Couldnt not set pid of service %s\n", argv[2]);
}
}
break;
default:
bb_show_usage();
}
} else {
bb_show_usage();
}
return ret;
dokill:
for (i = 2; i < argc; i++) {
pid = __readpid(argv[i]);
if (!pid) {
bb_error_msg("%s no such service\n", argv[i]);
ret = 1;
}
if (kill(pid, sig)) {
bb_error_msg("%s, could not send signal %d to PID %d\n",
argv[i], sig, pid);
ret = 1;
}
}
return ret;
}
}
/*
-u Up. If the service is not running, start it. If the service stops,
restart it.
-d Down. If the service is running, send it a TERM signal and then a CONT
signal. After it stops, do not restart it.
-o Once. If the service is not running, start it. Do not restart it if it
stops.
-r Tell supervise that the service is normally running; this affects status
messages.
-s Tell supervise that the service is normally stopped; this affects status
messages.
-p Pause. Send the service a STOP signal.
-c Continue. Send the service a CONT signal.
-h Hangup. Send the service a HUP signal.
-a Alarm. Send the service an ALRM signal.
-i Interrupt. Send the service an INT signal.
-t Terminate. Send the service a TERM signal.
-k Kill. Send the service a KILL signal.
-x Exit. supervise will quit as soon as the service is down.
*/

78
init/pidfilehack.c Normal file
View File

@ -0,0 +1,78 @@
/*
* minit version 0.9.1 by Felix von Leitner
* ported to busybox by Glenn McGrath <bug1@optushome.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/fcntl.h>
#include "busybox.h"
/* purpose: argv[1] is the full path to a PID file,
* argv+2 is the daemon to run.
* the daemon is expected to fork in the background and write its PID in
* the pid file.
*/
extern int pidfilehack_main(int argc, char **argv)
{
int count = 0;
if (argc < 3) {
bb_show_usage();
}
if (unlink(argv[2]) && (errno != ENOENT)) {
bb_perror_msg("could not remove pid file");
}
switch (fork()) {
case -1:
bb_perror_msg("could not fork");
return 2;
case 0: /* child */
execv(argv[3], argv + 3);
bb_perror_msg("execvp failed");
return 3;
}
do {
int fd = open(argv[2], O_RDONLY);
if (fd >= 0) {
static char buf[100] = "-P";
int len = read(fd, buf + 2, 100);
close(fd);
if (len > 0) {
char *_argv[] = { "msvc", 0, 0, 0 };
if (buf[len + 1] == '\n') {
buf[len + 1] = 0;
} else {
buf[len + 2] = 0;
}
_argv[1] = buf;
_argv[2] = argv[1];
execvp(_argv[0], _argv);
bb_perror_msg("execvp failed");
return 0;
}
}
sleep(1);
} while (++count < 30);
return(0);
}