100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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/*
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* (c) 2005,2006 Nico Schottelius (nico-linux at schottelius.org)
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* respawn_svc
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* part of cinit
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cinit.h"
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/* run a service, gets (relative or absolute) path */
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pid_t respawn_svc(char *abspath)
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{
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pid_t pid;
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int tmp;
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int pipefd[2];
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struct sigaction sa;
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char delay[PATH_MAX+1];
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D_PRINTF(abspath);
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if(pipe(pipefd) == -1) {
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perror(MSG_ERR_PIPE);
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return 0;
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}
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pid = fork();
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if(pid == -1) {
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perror(MSG_ERR_FORK);
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return 0;
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}
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/******************** PARENT ********************/
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if(pid > 0) {
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/* if we read anything, our child succeded */
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if( read(pipefd[0],&tmp,sizeof(tmp)) == -1) {
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perror(MSG_ERR_IO);
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return 0;
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}
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return pid; /* return watchers pid */
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}
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/****************** CHILD: Service watcher ********************/
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sa.sa_handler = sig_terminate;
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sigaction(SIGTERM,&sa,NULL); /* term = kill respawing process */
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/* sigterm handler should kill first our watching pid, reset the
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pid to 0 and then we'll kill ourselves */
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tmp = 1;
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if( write(pipefd[1],&tmp,sizeof(tmp)) == -1) {
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perror(MSG_ERR_IO);
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_exit(1);
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}
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/* try to read delay into sock */
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strcpy(delay,abspath);
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strcat(delay,SLASH);
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strcat(delay,C_DELAY);
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/* reuse sock to specify delay */
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sock = -1;
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tmp = open(delay,O_RDONLY);
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if(tmp != -1) {
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pipefd[0] = read(tmp,&delay[0],PATH_MAX);
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if(pipefd[0] > 0 && pipefd[0] <= PATH_MAX) {
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delay[pipefd[0]] = 0;
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sock = atoi(delay);
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}
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close(tmp);
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}
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do {
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/* exec_svc will set cpid accordingly */
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if( ! exec_svc(abspath, CMD_START_SVC) ) {
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if(cpid != 0) {
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D_PRINTF("sloefen");
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sleep(SLEEP_SVC);
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D_PRINTF("Zuende geschlafen");
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}
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}
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} while(cpid); /* cpid is reset by sig_terminate() */
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/* FIXME: put most code of sig_terminate here, look for no_kill */
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/* start off task */
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exec_svc(abspath,CMD_STOP_SVC);
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D_PRINTF("jetzt weg");
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_exit(0);
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}
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