From 8a529f590fcb84d2d966397f886be0192afafd7c Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 8 Nov 2007 22:31:28 +0000
Subject: [PATCH] Teach ps(1) to parse pts TT values (i.e. '0', '1') for the -t
 flag.

MFC after:	1 week
Reported by:	kris
---
 bin/ps/ps.c | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/bin/ps/ps.c b/bin/ps/ps.c
index 7ced4f49816..dc5f08da69e 100644
--- a/bin/ps/ps.c
+++ b/bin/ps/ps.c
@@ -74,6 +74,8 @@ __FBSDID("$FreeBSD$");
 
 #include "ps.h"
 
+#define	_PATH_PTS	"/dev/pts/"
+
 #define	W_SEP	" \t"		/* "Whitespace" list separators */
 #define	T_SEP	","		/* "Terminate-element" list separators */
 
@@ -706,9 +708,9 @@ addelem_pid(struct listinfo *inf, const char *elem)
 
 /*-
  * The user can specify a device via one of three formats:
- *     1) fully qualified, e.g.:     /dev/ttyp0 /dev/console
- *     2) missing "/dev", e.g.:      ttyp0      console
- *     3) two-letters, e.g.:         p0         co
+ *     1) fully qualified, e.g.:     /dev/ttyp0 /dev/console	/dev/pts/0
+ *     2) missing "/dev", e.g.:      ttyp0      console		pts/0
+ *     3) two-letters, e.g.:         p0         co		0
  *        (matching letters that would be seen in the "TT" column)
  */
 static int
@@ -716,10 +718,11 @@ addelem_tty(struct listinfo *inf, const char *elem)
 {
 	const char *ttypath;
 	struct stat sb;
-	char pathbuf[PATH_MAX], pathbuf2[PATH_MAX];
+	char pathbuf[PATH_MAX], pathbuf2[PATH_MAX], pathbuf3[PATH_MAX];
 
 	ttypath = NULL;
 	pathbuf2[0] = '\0';
+	pathbuf3[0] = '\0';
 	switch (*elem) {
 	case '/':
 		ttypath = elem;
@@ -736,6 +739,8 @@ addelem_tty(struct listinfo *inf, const char *elem)
 		ttypath = pathbuf;
 		if (strncmp(pathbuf, _PATH_TTY, strlen(_PATH_TTY)) == 0)
 			break;
+		if (strncmp(pathbuf, _PATH_PTS, strlen(_PATH_PTS)) == 0)
+			break;
 		if (strcmp(pathbuf, _PATH_CONSOLE) == 0)
 			break;
 		/* Check to see if /dev/tty${elem} exists */
@@ -746,21 +751,30 @@ addelem_tty(struct listinfo *inf, const char *elem)
 			ttypath = NULL;	
 			break;
 		}
+		/* Check to see if /dev/pts/${elem} exists */
+		strlcpy(pathbuf3, _PATH_PTS, sizeof(pathbuf3));
+		strlcat(pathbuf3, elem, sizeof(pathbuf3));
+		if (stat(pathbuf3, &sb) == 0 && S_ISCHR(sb.st_mode)) {
+			/* No need to repeat stat() && S_ISCHR() checks */
+			ttypath = NULL;	
+			break;
+		}
 		break;
 	}
 	if (ttypath) {
 		if (stat(ttypath, &sb) == -1) {
-			if (pathbuf2[0] != '\0')
-				warn("%s and %s", pathbuf2, ttypath);
+			if (pathbuf3[0] != '\0')
+				warn("%s, %s, and %s", pathbuf3, pathbuf2,
+				    ttypath);
 			else
 				warn("%s", ttypath);
 			optfatal = 1;
 			return (0);
 		}
 		if (!S_ISCHR(sb.st_mode)) {
-			if (pathbuf2[0] != '\0')
-				warnx("%s and %s: Not a terminal", pathbuf2,
-				    ttypath);
+			if (pathbuf3[0] != '\0')
+				warnx("%s, %s, and %s: Not a terminal",
+				    pathbuf3, pathbuf2, ttypath);
 			else
 				warnx("%s: Not a terminal", ttypath);
 			optfatal = 1;
-- 
2.45.0