linux-kernel - regression, bisected: openpty fails from 3.7 onwards without devpts

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Message-ID: <20130110144626.GA26279@breakpoint.cc>
Date:	Thu, 10 Jan 2013 15:46:26 +0100
From:	Florian Westphal <fw@...len.de>
To:	linux-kernel@...r.kernel.org
Cc:	gaowanlong@...fujitsu.com, alan@...ux.intel.com,
	gregkh@...uxfoundation.org, frank@...htenheld.de
Subject: regression, bisected: openpty fails from 3.7 onwards without devpts

Frank Lichtenheld discovered that openpty() doesn't work anymore when
/dev/pts is not present.

We bisected this down to

commit bbb63c514a3464342967237a51a21ea8f61ab951
Author: Wanlong Gao <gaowanlong@...fujitsu.com>
Subject: drivers:tty:fix up ENOIOCTLCMD error handling

The original program triggering the error was pptpd, but
the test program below is sufficient:
----
#include <stdio.h>
#include <pty.h>
int main(void) {
 int pty_fd, tty_fd;
 if (openpty(&pty_fd, &tty_fd, NULL, NULL, NULL) != 0) {
  perror("openpty");
  return 1;
 }
return 0;
}
----
[ compile with cc -lutil pty.c -o pty ]

If devpts is available or above commit reverted openpty works again.
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