166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
/*****************************************************************************
|
|
*
|
|
* $Id$
|
|
* Purpose ...............: Node locking
|
|
*
|
|
*****************************************************************************
|
|
* Copyright (C) 1997-2003
|
|
*
|
|
* Michiel Broek FIDO: 2:280/2802
|
|
* Beekmansbos 10
|
|
* 1971 BV IJmuiden
|
|
* the Netherlands
|
|
*
|
|
* This file is part of MBSE BBS.
|
|
*
|
|
* This BBS is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2, or (at your option) any
|
|
* later version.
|
|
*
|
|
* MBSE BBS is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with MBSE BBS; see the file COPYING. If not, write to the Free
|
|
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
*****************************************************************************/
|
|
|
|
#include "../config.h"
|
|
#include "libs.h"
|
|
#include "structs.h"
|
|
#include "clcomm.h"
|
|
#include "common.h"
|
|
|
|
|
|
|
|
int nodelock(faddr *addr)
|
|
{
|
|
char *fn, *tfn, *p, tmp[16];
|
|
FILE *fp;
|
|
pid_t pid, mypid;
|
|
int tmppid, sverr;
|
|
time_t ltime, now;
|
|
|
|
fn = bsyname(addr);
|
|
tfn = xstrcpy(fn);
|
|
if ((p=strrchr(tfn,'/')))
|
|
*++p='\0';
|
|
mypid = getpid();
|
|
sprintf(tmp, "aa%d", mypid);
|
|
tfn = xstrcat(tfn, tmp);
|
|
mkdirs(tfn, 0770);
|
|
|
|
if ((fp = fopen(tfn,"w")) == NULL) {
|
|
WriteError("$Can't open tmp file for bsy lock (%s) \"%s\"",ascfnode(addr, 0x1f), tfn);
|
|
free(tfn);
|
|
return 1;
|
|
}
|
|
|
|
fprintf(fp,"%10d\n", mypid);
|
|
fclose(fp);
|
|
chmod(tfn, 0440);
|
|
if (link(tfn, fn) == 0) {
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 0;
|
|
} else {
|
|
sverr = errno;
|
|
}
|
|
|
|
if (sverr != EEXIST) {
|
|
WriteError("$Could not link \"%s\" to \"%s\"",tfn,fn);
|
|
WriteError("Locking %s failed", ascfnode(addr, 0x1f));
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 1;
|
|
}
|
|
|
|
if ((fp = fopen(fn,"r")) == NULL) {
|
|
WriteError("$Could not open existing lock file \"%s\"",fn);
|
|
WriteError("Locking %s failed", ascfnode(addr, 0x1f));
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Lock exists, check owner
|
|
*/
|
|
fscanf(fp, "%d", &tmppid);
|
|
pid = tmppid;
|
|
fclose(fp);
|
|
|
|
/*
|
|
* If lock is our own lock, then it's ok and we are ready.
|
|
*/
|
|
if (getpid() == pid) {
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Stale or old lock tests
|
|
*/
|
|
ltime = file_time(fn);
|
|
now = time(NULL);
|
|
if (kill(pid, 0) && (errno == ESRCH)) {
|
|
Syslog('+', "Found stale bsy file for %s, unlink", ascfnode(addr,0x1f));
|
|
unlink(fn);
|
|
} else if (((unsigned long)now - (unsigned long)ltime) > 21600) {
|
|
Syslog('+', "Found lock older then 6 hours for %s, unlink", ascfnode(addr,0x1f));
|
|
unlink(fn);
|
|
} else {
|
|
Syslog('+', "Node %s is locked by pid %d", ascfnode(addr, 0x1f), pid);
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 1;
|
|
}
|
|
|
|
if (link(tfn,fn) == 0) {
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 0;
|
|
} else {
|
|
WriteError("$Could not link \"%s\" to \"%s\"",tfn,fn);
|
|
WriteError("Locking %s failed", ascfnode(addr, 0x1f));
|
|
unlink(tfn);
|
|
free(tfn);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
int nodeulock(faddr *addr)
|
|
{
|
|
char *fn;
|
|
FILE *fp;
|
|
pid_t pid, mypid;
|
|
int tmppid;
|
|
|
|
fn = bsyname(addr);
|
|
if ((fp = fopen(fn, "r")) == NULL) {
|
|
WriteError("$Can't open lock file (%s) \"%s\"", ascfnode(addr, 0x1f), fn);
|
|
return 1;
|
|
}
|
|
|
|
fscanf(fp, "%d", &tmppid);
|
|
pid = tmppid;
|
|
fclose(fp);
|
|
mypid = getpid();
|
|
|
|
if (pid == mypid) {
|
|
unlink(fn);
|
|
return 0;
|
|
} else {
|
|
WriteError("Unlock (%s) file failed for process %u, we are %u", ascfnode(addr, 0x1f), pid,mypid);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|