In wall and who, check that the utmp entry isn't stalled, as it is done in w.

Apparently with the new pts code stalled entries are printed, when they are
not with the BSD ptys.

Submitted by:	Michal Mertl <mime at traveller dot cz>

1 files changed, 21 insertions, 3 deletions

diff --git a/usr.bin/who/who.c b/usr.bin/who/who.c
index 27b68960c2bc..f94fcdb34743 100644
--- a/usr.bin/who/who.c
+++ b/usr.bin/who/who.c
@@ -27,6 +27,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <sys/param.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
@@ -203,14 +204,31 @@ row(struct utmp *ut)
 	putchar('\n');
 }
 
+static int
+ttystat(char *line, int sz)
+{
+	struct stat sb;
+	char ttybuf[MAXPATHLEN];
+
+	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
+	if (stat(ttybuf, &sb) == 0) {
+		return (0);
+	} else
+		return (-1);
+}
+
 static void
 process_utmp(FILE *fp)
 {
 	struct utmp ut;
 
-	while (fread(&ut, sizeof(ut), 1, fp) == 1)
-		if (*ut.ut_name != '\0')
-			row(&ut);
+	while (fread(&ut, sizeof(ut), 1, fp) == 1) {
+		if (*ut.ut_name == '\0')
+			continue;
+		if (ttystat(ut.ut_line, UT_LINESIZE) != 0)
+			continue;
+		row(&ut);
+	}
 }
 
 static void