101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
|
/*
|
||
|
|
* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
|
||
|
|
* run_svc
|
||
|
|
* part of cinit
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/wait.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <limits.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
|
||
|
|
#include "cinit.h"
|
||
|
|
|
||
|
|
/* run a service, gets (relative or absolute) path */
|
||
|
|
pid_t respawn_svc(char *abspath)
|
||
|
|
{
|
||
|
|
pid_t pid;
|
||
|
|
int tmp;
|
||
|
|
int pipefd[2];
|
||
|
|
struct sigaction sa;
|
||
|
|
char delay[PATH_MAX+1];
|
||
|
|
|
||
|
|
if(pipe(pipefd) == -1) {
|
||
|
|
perror(MSG_ERR_PIPE);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
pid = fork();
|
||
|
|
if(pid == -1) {
|
||
|
|
perror(MSG_ERR_FORK);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************** PARENT ********************/
|
||
|
|
if(pid > 0) {
|
||
|
|
/* if we read anything, our child succeded */
|
||
|
|
if( read(pipefd[0],&tmp,sizeof(tmp)) == -1) {
|
||
|
|
perror(MSG_ERR_IO);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return pid; /* return watchers pid */
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************** CHILD: Service watcher ********************/
|
||
|
|
sa.sa_handler = sig_terminate;
|
||
|
|
sigaction(SIGTERM,&sa,NULL); /* term = kill respawing process */
|
||
|
|
/* sigterm handler should kill first our watching pid, reset the
|
||
|
|
pid to 0 and then we'll kill ourselves */
|
||
|
|
|
||
|
|
tmp = 1;
|
||
|
|
if( write(pipefd[1],&tmp,sizeof(tmp)) == -1) {
|
||
|
|
perror(MSG_ERR_IO);
|
||
|
|
_exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* try to read delay into sock */
|
||
|
|
strcpy(delay,abspath);
|
||
|
|
strcat(delay,SLASH);
|
||
|
|
strcat(delay,C_DELAY);
|
||
|
|
|
||
|
|
/* reuse sock to specify delay */
|
||
|
|
sock = -1;
|
||
|
|
tmp = open(delay,O_RDONLY);
|
||
|
|
if(tmp != -1) {
|
||
|
|
pipefd[0] = read(tmp,&delay[0],PATH_MAX);
|
||
|
|
if(pipefd[0] > 0 && pipefd[0] <= PATH_MAX) {
|
||
|
|
delay[pipefd[0]] = 0;
|
||
|
|
sock = atoi(delay);
|
||
|
|
}
|
||
|
|
close(tmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
do {
|
||
|
|
/* exec_svc will set cpid accordingly */
|
||
|
|
if( ! exec_svc(abspath, 1) ) {
|
||
|
|
/* only sleep if the service execited itself and is not
|
||
|
|
killed by sig_term */
|
||
|
|
if(cpid != 0) {
|
||
|
|
D_PRINTF(abspath);
|
||
|
|
sleep(SLEEP_SVC);
|
||
|
|
D_PRINTF("fertig");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} while( cpid ); /* cpid is reset by sig_terminate() */
|
||
|
|
|
||
|
|
/* start off task */
|
||
|
|
exec_svc(abspath,0);
|
||
|
|
|
||
|
|
/* write cinit that we killed it */
|
||
|
|
msg_change_status(abspath,ST_OFF,0);
|
||
|
|
|
||
|
|
_exit(0);
|
||
|
|
}
|