www.nico.schottelius.org/software/cinit/browse_source/cinit-0.2/client/run_svc.c
Nico Schottelius 423ba10303 import cinit from unix.schottelius.org
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
2009-09-16 12:53:45 +02:00

129 lines
3.2 KiB
C

/*
* (c) 2005 Nico Schottelius (nico-linux-cinit 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 before 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 RT_UNSPEC;
}
/* change to rpath */
if(chdir(rpath) == -1) {
perror(rpath);
return RT_NOTEXIST;
}
/* get absolute name of rpath */
if(! (int) getcwd(abspath,PATH_MAX)) {
perror(abspath);
return RT_UNSPEC;
}
/* change back */
if(chdir(pathtmp) == -1) {
perror(pathtmp);
return RT_UNSPEC;
}
D_PRINTF(abspath);
/******************* REGISTER SERVICE ***************/
do {
tmp = msg_svc_on_off(abspath,CMD_START_SVC); /* check status */
switch(tmp) {
case ST_FAIL: /* somebody failed before, we won't retry */
return RT_SVC_FAILED;
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 RT_ERR_COMM: /* communication failed */
case ST_RESPAWN: /* somebody does our work */
case ST_NEED_FAIL: /* the needs failed before */
return tmp;
break;
case RT_TMPNOW: /* do not go to default: */
break;
default:
mini_printf(MSG_SHOULD_NOT_HAPPEN,1);
return RT_UNSPEC;
break;
}
} while(tmp != RT_TMPNOW);
/******************* BEGIN DEPENDENCIES ***************/
strcpy(pathtmp,abspath);
strcat(pathtmp,SLASH);
strcat(pathtmp,C_NEEDS);
/* check for needs */
if( stat(pathtmp,&buf) == 0 ) {
if( ! run_run_svcs(pathtmp) ) {
SERVICE_LOG(abspath,LOG_NEED_FAIL);
msg_change_status(abspath, ST_NEED_FAIL, 0);
return ST_NEED_FAIL;
}
}
/********** 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, CMD_START_SVC);
tmp = ST_ONCE;
}
if(!pid) {
msg_change_status(abspath, ST_FAIL, pid);
return ST_FAIL;
}
if(!msg_change_status(abspath, tmp, pid) ) {
return RT_ERR_COMM;
}
return tmp; /* ST_ONCE || ST_RESPAWN */
}
/* cinit-0.2 return codes implemented */