When -o isn't specified, open /dev/null as stdin.

Suggested by:	jhb

1 files changed, 5 insertions, 2 deletions

diff --git a/usr.bin/xargs/xargs.c b/usr.bin/xargs/xargs.c
index 5e6c2b4..76aa5b7 100644
--- a/usr.bin/xargs/xargs.c
+++ b/usr.bin/xargs/xargs.c
@@ -526,10 +526,13 @@ exec:
 	case -1:
 		err(1, "vfork");
 	case 0:
+		close(0);
 		if (oflag) {
-			close(0);
 			if (open("/dev/tty", O_RDONLY) == -1)
-				err(1, "open");
+				err(1, "open /dev/tty");
+		} else {
+			if (open("/dev/null", O_RDONLY) == -1)
+				err(1, "open /dev/null");
 		}
 		execvp(argv[0], argv);
 		childerr = errno;