mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-29 06:47:21 +01:00
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)uucplock.c 8.1 (Berkeley) 6/6/93";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/file.h>
|
|
#include <sys/dir.h>
|
|
#include <errno.h>
|
|
#include "pathnames.h"
|
|
|
|
/*
|
|
* uucp style locking routines
|
|
* return: 0 - success
|
|
* -1 - failure
|
|
*/
|
|
|
|
uu_lock(ttyname)
|
|
char *ttyname;
|
|
{
|
|
extern int errno;
|
|
int fd, pid;
|
|
char tbuf[sizeof(_PATH_LOCKDIRNAME) + MAXNAMLEN];
|
|
off_t lseek();
|
|
|
|
(void)sprintf(tbuf, _PATH_LOCKDIRNAME, ttyname);
|
|
fd = open(tbuf, O_RDWR|O_CREAT|O_EXCL, 0660);
|
|
if (fd < 0) {
|
|
/*
|
|
* file is already locked
|
|
* check to see if the process holding the lock still exists
|
|
*/
|
|
fd = open(tbuf, O_RDWR, 0);
|
|
if (fd < 0) {
|
|
perror("lock open");
|
|
return(-1);
|
|
}
|
|
if (read(fd, &pid, sizeof(pid)) != sizeof(pid)) {
|
|
(void)close(fd);
|
|
perror("lock read");
|
|
return(-1);
|
|
}
|
|
|
|
if (kill(pid, 0) == 0 || errno != ESRCH) {
|
|
(void)close(fd); /* process is still running */
|
|
return(-1);
|
|
}
|
|
/*
|
|
* The process that locked the file isn't running, so
|
|
* we'll lock it ourselves
|
|
*/
|
|
if (lseek(fd, 0L, L_SET) < 0) {
|
|
(void)close(fd);
|
|
perror("lock lseek");
|
|
return(-1);
|
|
}
|
|
/* fall out and finish the locking process */
|
|
}
|
|
pid = getpid();
|
|
if (write(fd, (char *)&pid, sizeof(pid)) != sizeof(pid)) {
|
|
(void)close(fd);
|
|
(void)unlink(tbuf);
|
|
perror("lock write");
|
|
return(-1);
|
|
}
|
|
(void)close(fd);
|
|
return(0);
|
|
}
|
|
|
|
uu_unlock(ttyname)
|
|
char *ttyname;
|
|
{
|
|
char tbuf[sizeof(_PATH_LOCKDIRNAME) + MAXNAMLEN];
|
|
|
|
(void)sprintf(tbuf, _PATH_LOCKDIRNAME, ttyname);
|
|
return(unlink(tbuf));
|
|
}
|