Add a "jail" keyword to list the name of a jail rather than its ID.

Inspired by:	mwlucas
Reviewed by:	jamie
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D14683

1 files changed, 14 insertions, 0 deletions

diff --git a/bin/ps/print.c b/bin/ps/print.c
index 437c1cbfc83a..c2853071b451 100644
--- a/bin/ps/print.c
+++ b/bin/ps/print.c
@@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
 
 #include <err.h>
 #include <grp.h>
+#include <jail.h>
 #include <langinfo.h>
 #include <locale.h>
 #include <math.h>
@@ -840,3 +841,16 @@ loginclass(KINFO *k, VARENT *ve __unused)
 	}
 	return (strdup(k->ki_p->ki_loginclass));
 }
+
+char *
+jailname(KINFO *k, VARENT *ve __unused)
+{
+	char *name;
+
+	if (k->ki_p->ki_jid == 0)
+		return (strdup("-"));
+	name = jail_getname(k->ki_p->ki_jid);
+	if (name == NULL)
+		return (strdup("-"));
+	return (name);
+}