www.nico.schottelius.org/software/cinit/browse_source/cinit-0.0.8/client/run_svc.c

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/*
* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
* run_svc
* part of cinit
*/
/* headers are clean */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
#include "cinit.h"
/***********************************************************************
* run_svc: run a service and beforeo all dependencies
*/
int run_svc(char *rpath)
{
int tmp;
pid_t pid;
char abspath[PATH_MAX], pathtmp[PATH_MAX]; /* pathtmp = use-it-for-all bitch*/
struct stat buf;
struct timespec ts;
/******************* absolute PATH ***************/
/* get current working dir */
if(! (int) getcwd(pathtmp,PATH_MAX)) {
perror(pathtmp);
return 0;
}
/* change to rpath */
if(chdir(rpath) == -1) {
perror(rpath);
return 0;
}
/* get absolute name of rpath */
if(! (int) getcwd(abspath,PATH_MAX)) {
perror(abspath);
return 0;
}
/* change back */
if(chdir(pathtmp) == -1) {
perror(pathtmp);
return 0;
}
/******************* REGISTER SERVICE ***************/
do {
tmp = msg_svc_on_off(abspath,1); /* check status */
switch(tmp) {
case 0: /* failed to communicate */
case ST_FAIL: /* somebody failed, we won't retry */
return 0;
break;
case ST_TMP: /* someone is working on it */
ts.tv_sec = SLEEP_RERUN;
nanosleep(&ts,NULL);
break;
case ST_ONCE: /* somebody did our work */
case ST_RESPAWN: /* somebody does our work */
return 1;
break;
case ST_TMPNOW: /* we are on it! */
break;
}
} while(tmp != ST_TMPNOW);
/******************* BEGIN DEPENDENCIES ***************/
strcpy(pathtmp,abspath);
strcat(pathtmp,SLASH);
strcat(pathtmp,C_NEEDS);
if( stat(pathtmp,&buf) == 0 ) {
if( ! run_run_svcs(pathtmp) ) {
msg_change_status(abspath, ST_FAIL, 0);
return 0;
}
}
/********** WANTS ************/
strcpy(pathtmp,abspath);
strcat(pathtmp,SLASH);
strcat(pathtmp,C_WANTS);
if( stat(pathtmp,&buf) == 0 ) {
run_run_svcs(pathtmp); /* don't care about what happens with the want svc */
}
/******************* execute services ***************/
strcpy(pathtmp,abspath);
strcat(pathtmp,SLASH);
strcat(pathtmp,C_RESPAWN);
if( stat(pathtmp,&buf) == 0) {
pid = respawn_svc(abspath);
tmp = ST_RESPAWN;
} else {
pid = exec_svc(abspath, 1);
tmp = ST_ONCE;
}
if(!pid) {
msg_change_status(abspath, ST_FAIL, pid);
D_PRINTF(abspath);
D_PRINTF("exec fehlgeschlagen");
return 0;
}
if(!msg_change_status(abspath, tmp, pid) ) {
D_PRINTF("msg change fehlgeschlagen");
return 0;
}
return 1;
}