159 lines
3.4 KiB
C
159 lines
3.4 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: Node locking
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*
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*****************************************************************************
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* Copyright (C) 1997-2002
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*****************************************************************************/
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#include "../config.h"
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#include "libs.h"
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#include "memwatch.h"
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#include "structs.h"
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#include "clcomm.h"
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#include "common.h"
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int nodelock(faddr *addr)
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{
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char *fn,*tfn,*p;
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char tmp[16];
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FILE *fp;
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pid_t pid,mypid;
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int tmppid,sverr;
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fn = bsyname(addr);
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tfn = xstrcpy(fn);
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if ((p=strrchr(tfn,'/')))
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*++p='\0';
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mypid = getpid();
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sprintf(tmp, "aa%d", mypid);
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tfn = xstrcat(tfn, tmp);
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mkdirs(tfn, 0770);
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if ((fp = fopen(tfn,"w")) == NULL) {
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WriteError("$Can't open tmp file for bsy lock (%s) \"%s\"",ascfnode(addr, 0x1f), tfn);
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free(tfn);
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return 1;
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}
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fprintf(fp,"%10d\n", mypid);
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fclose(fp);
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chmod(tfn, 0440);
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if (link(tfn, fn) == 0) {
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unlink(tfn);
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free(tfn);
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return 0;
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} else {
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sverr=errno;
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}
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if (sverr != EEXIST) {
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WriteError("$Could not link \"%s\" to \"%s\"",tfn,fn);
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WriteError("Locking %s failed", ascfnode(addr, 0x1f));
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unlink(tfn);
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free(tfn);
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return 1;
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}
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if ((fp=fopen(fn,"r")) == NULL) {
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WriteError("$Could not open existing lock file \"%s\"",fn);
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WriteError("Locking %s failed", ascfnode(addr, 0x1f));
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unlink(tfn);
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free(tfn);
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return 1;
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}
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/*
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* Lock exists, check owner
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*/
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fscanf(fp, "%d", &tmppid);
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pid = tmppid;
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fclose(fp);
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/*
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* If lock is our own lock, then it's ok and we are ready.
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*/
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if (getpid() == pid) {
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unlink(tfn);
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free(tfn);
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return 0;
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}
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if (kill(pid, 0) && (errno == ESRCH)) {
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Syslog('+', "Found stale bsy file for %s, unlink", ascfnode(addr,0x1f));
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unlink(fn);
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} else {
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Syslog('+', "Node %s is locked by pid %d", ascfnode(addr, 0x1f), pid);
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unlink(tfn);
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free(tfn);
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return 1;
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}
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if (link(tfn,fn) == 0) {
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unlink(tfn);
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free(tfn);
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return 0;
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} else {
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WriteError("$Could not link \"%s\" to \"%s\"",tfn,fn);
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WriteError("Locking %s failed", ascfnode(addr, 0x1f));
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unlink(tfn);
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free(tfn);
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return 1;
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}
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}
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int nodeulock(faddr *addr)
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{
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char *fn;
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FILE *fp;
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pid_t pid,mypid;
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int tmppid;
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fn = bsyname(addr);
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if ((fp = fopen(fn, "r")) == NULL) {
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WriteError("$Can't open lock file (%s) \"%s\"", ascfnode(addr, 0x1f), fn);
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return 1;
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}
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fscanf(fp, "%d", &tmppid);
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pid = tmppid;
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fclose(fp);
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mypid = getpid();
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if (pid == mypid) {
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unlink(fn);
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return 0;
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} else {
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WriteError("Unlock (%s) file failed for process %u, we are %u", ascfnode(addr, 0x1f), pid,mypid);
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return 1;
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}
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}
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