130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
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/*
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* (c) 2005 Nico Schottelius (nico-linux-cinit at schottelius.org)
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* run_svc
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* part of cinit
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*/
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/* headers are clean */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string.h>
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#include <limits.h>
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#include <stdio.h>
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#include <time.h>
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#include "cinit.h"
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/***********************************************************************
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* run_svc: run a service and before all dependencies
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*/
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int run_svc(char *rpath)
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{
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int tmp;
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pid_t pid;
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char abspath[PATH_MAX], pathtmp[PATH_MAX]; /* pathtmp will be misused */
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struct stat buf;
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struct timespec ts;
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/******************* absolute PATH ***************/
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/* save current working dir */
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if(! (int) getcwd(pathtmp,PATH_MAX)) {
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perror(pathtmp);
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return RT_UNSPEC;
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}
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/* change to rpath */
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if(chdir(rpath) == -1) {
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perror(rpath);
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return RT_NOTEXIST;
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}
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/* get absolute name of rpath */
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if(! (int) getcwd(abspath,PATH_MAX)) {
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perror(abspath);
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return RT_UNSPEC;
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}
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/* change back */
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if(chdir(pathtmp) == -1) {
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perror(pathtmp);
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return RT_UNSPEC;
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}
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D_PRINTF(abspath);
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/******************* REGISTER SERVICE ***************/
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do {
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tmp = msg_svc_on_off(abspath,CMD_START_SVC); /* check status */
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switch(tmp) {
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case ST_FAIL: /* somebody failed before, we won't retry */
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return RT_SVC_FAILED;
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break;
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case ST_TMP: /* someone is working on it */
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ts.tv_sec = SLEEP_RERUN;
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nanosleep(&ts,NULL);
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break;
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case ST_ONCE: /* somebody did our work */
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case RT_ERR_COMM: /* communication failed */
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case ST_RESPAWN: /* somebody does our work */
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case ST_NEED_FAIL: /* the needs failed before */
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return tmp;
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break;
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case RT_TMPNOW: /* do not go to default: */
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break;
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default:
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mini_printf(MSG_SHOULD_NOT_HAPPEN,1);
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return RT_UNSPEC;
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break;
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}
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} while(tmp != RT_TMPNOW);
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/******************* BEGIN DEPENDENCIES ***************/
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strcpy(pathtmp,abspath);
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strcat(pathtmp,SLASH);
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strcat(pathtmp,C_NEEDS);
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/* check for needs */
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if( stat(pathtmp,&buf) == 0 ) {
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if( ! run_run_svcs(pathtmp) ) {
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SERVICE_LOG(abspath,LOG_NEED_FAIL);
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msg_change_status(abspath, ST_NEED_FAIL, 0);
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return ST_NEED_FAIL;
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}
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}
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/********** WANTS ************/
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strcpy(pathtmp,abspath);
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strcat(pathtmp,SLASH);
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strcat(pathtmp,C_WANTS);
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if( stat(pathtmp,&buf) == 0 ) {
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run_run_svcs(pathtmp); /* don't care about what happens with the want svc */
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}
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/******************* execute services ***************/
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strcpy(pathtmp,abspath);
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strcat(pathtmp,SLASH);
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strcat(pathtmp,C_RESPAWN);
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if( stat(pathtmp,&buf) == 0) {
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pid = respawn_svc(abspath);
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tmp = ST_RESPAWN;
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} else {
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pid = exec_svc(abspath, CMD_START_SVC);
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tmp = ST_ONCE;
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}
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if(!pid) {
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msg_change_status(abspath, ST_FAIL, pid);
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return ST_FAIL;
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}
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if(!msg_change_status(abspath, tmp, pid) ) {
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return RT_ERR_COMM;
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}
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return tmp; /* ST_ONCE || ST_RESPAWN */
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}
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/* cinit-0.2 return codes implemented */
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