From 53f02d506ae00530f749c68f1f75ba8b2abc378b Mon Sep 17 00:00:00 2001
From: millert <millert@openbsd.org>
Date: Sat, 29 Mar 1997 02:59:55 +0000
Subject: [PATCH] Make ``mail.local -H'' explicately indicate when the lock
 fails or succeeds.

---
 libexec/mail.local/mail.local.8 |  7 +++++--
 libexec/mail.local/mail.local.c | 23 +++++++++++++++--------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/libexec/mail.local/mail.local.8 b/libexec/mail.local/mail.local.8
index d92dc7c2ec4..b21bca3a314 100644
--- a/libexec/mail.local/mail.local.8
+++ b/libexec/mail.local/mail.local.8
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"	from: @(#)mail.local.8	6.8 (Berkeley) 4/27/91
-.\"	$Id: mail.local.8,v 1.7 1996/12/05 15:00:40 deraadt Exp $
+.\"	$Id: mail.local.8,v 1.8 1997/03/29 02:59:55 millert Exp $
 .\"
 .Dd April 27, 1991
 .Dt MAIL.LOCAL 8
@@ -75,7 +75,10 @@ In this mode
 (ignoring all other arguments) attains a
 .Nm username.lock
 for the calling user and retains it until stdin is closed or a signal
-like SIGINT, SIGTERM, or SIGHUP is received.
+like SIGINT, SIGTERM, or SIGHUP is received.  If
+.Nm mail.local
+is able to create the lock file, ``1'' is written to stdout, otherwise
+``0'' is written and an error message is written to stderr.
 .El
 .Pp
 Individual mail messages in the mailbox are delimited by an empty
diff --git a/libexec/mail.local/mail.local.c b/libexec/mail.local/mail.local.c
index fb98d49b638..a1d38550953 100644
--- a/libexec/mail.local/mail.local.c
+++ b/libexec/mail.local/mail.local.c
@@ -39,7 +39,7 @@ char copyright[] =
 
 #ifndef lint
 /*static char sccsid[] = "from: @(#)mail.local.c	5.6 (Berkeley) 6/19/91";*/
-static char rcsid[] = "$Id: mail.local.c,v 1.13 1997/03/28 02:16:40 millert Exp $";
+static char rcsid[] = "$Id: mail.local.c,v 1.14 1997/03/29 02:59:56 millert Exp $";
 #endif /* not lint */
 
 #include <sys/param.h>
@@ -166,8 +166,11 @@ dohold()
 	}
 
 	holdfd = getlock(from, pw);
-	if (holdfd == -1)
+	if (holdfd == -1) {
+		write(STDOUT_FILENO, "0\n", 2);
 		return (1);
+	}
+	write(STDOUT_FILENO, "1\n", 2);
 
 	while (read(0, &c, 1) == -1 && errno == EINTR)
 		;
@@ -317,17 +320,21 @@ again:
 		/*
 		 * Only root can write the spool directory.
 		 */
- 		if ((lfd = open(lpath, O_CREAT|O_WRONLY|O_EXCL,
- 		    S_IRUSR|S_IWUSR)) < 0) {
- 			err(NOTFATAL, "%s: %s", lpath, strerror(errno));
- 			return(-1);
+		while (1) {
+			if ((lfd = open(lpath, O_CREAT|O_WRONLY|O_EXCL,
+			    S_IRUSR|S_IWUSR)) != -1)
+				break;
+			if (tries > 9) {
+				err(NOTFATAL, "%s: %s", lpath, strerror(errno));
+				return(-1);
+			}
+			sleep(1 << tries);
+			tries++;
 		}
 	}
 	return (lfd);
 }
 
-
-
 int
 deliver(fd, name, lockfile)
 	int fd;
-- 
2.20.1