initial import of NetBSD tree

1 files changed, 127 insertions, 0 deletions

diff --git a/usr.bin/tip/uucplock.c b/usr.bin/tip/uucplock.c
new file mode 100644
index 00000000000..cf653acce9f
--- /dev/null
+++ b/usr.bin/tip/uucplock.c
@@ -0,0 +1,127 @@
+/*	$NetBSD: uucplock.c,v 1.6 1995/09/26 06:02:14 jtc Exp $	*/
+
+/*
+ * 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
+#if 0
+static char sccsid[] = "@(#)uucplock.c	8.1 (Berkeley) 6/6/93";
+#endif
+static char rcsid[] = "$NetBSD: uucplock.c,v 1.6 1995/09/26 06:02:14 jtc Exp $";
+#endif /* not lint */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#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;
+{
+	int fd, pid;
+	char tbuf[sizeof(_PATH_LOCKDIRNAME) + MAXNAMLEN];
+	char text_pid[81];
+	int len;
+
+	(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(tbuf);
+			fprintf(stderr, "Can't open lock file.\n");
+			return(-1);
+		}
+		len = read(fd, text_pid, sizeof(text_pid)-1);
+		if(len<=0) {
+			perror(tbuf);
+			(void)close(fd);
+			fprintf(stderr, "Can't read lock file.\n");
+			return(-1);
+		}
+		text_pid[len] = 0;
+		pid = atol(text_pid);
+
+		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
+		 */
+		fprintf(stderr, "Stale lock on %s PID=%d... overriding.\n",
+			ttyname, pid);
+		if (lseek(fd, (off_t)0, L_SET) < 0) {
+			perror(tbuf);
+			(void)close(fd);
+			fprintf(stderr, "Can't seek lock file.\n");
+			return(-1);
+		}
+		/* fall out and finish the locking process */
+	}
+	pid = getpid();
+	sprintf(text_pid, "%10d\n", pid);
+	len = strlen(text_pid);
+	if (write(fd, text_pid, len) != len) {
+		(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));
+}