From: Ben Gras <ben@minix3.org>
Date: Tue, 11 Jun 2013 14:30:31 +0000 (+0000)
Subject: init: handle getty string of "" (default)
X-Git-Tag: v3.3.0~927
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=63306d0ad552592fda2d6dbe0f3fe138b9ba5c3b;p=minix.git

init: handle getty string of "" (default)

	. the default entry for disabled ttys for getty
	  in /etc/ttys is "", but init crashed on handling that
	  string.

Change-Id: Ib7cd6c6869e338f47df0aa5abed36f15eda4f6ff
---

diff --git a/servers/init/init.c b/servers/init/init.c
index 4fc9bec45..abfe038d3 100644
--- a/servers/init/init.c
+++ b/servers/init/init.c
@@ -263,15 +263,16 @@ void startup(int linenr, struct ttyent *ttyp)
 
 	/* Construct argv for execute() */
 	ty_getty_argv = construct_argv(ttyp->ty_getty);
-	if (ty_getty_argv == NULL)
+	if (ty_getty_argv == NULL) {
 		report(2, "construct_argv");
-
-	/* Execute the getty process. */
-	execute(ty_getty_argv);
+	} else {
+		/* Execute the getty process. */
+		execute(ty_getty_argv);
+	}
 
 	/* Oops, disaster strikes. */
 	fcntl(2, F_SETFL, fcntl(2, F_GETFL) | O_NONBLOCK);
-	if (linenr != 0) report(2, ty_getty_argv[0]);
+	if (linenr != 0 && ty_getty_argv) report(2, ty_getty_argv[0]);
 	write(err[1], &errno, sizeof(errno));
 	_exit(1);
   }