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VT_WAITACTIVE: Avoid returning EINTR when not necessary

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We should generally prefer to return ERESTARTNOHAND rather than EINTR,
so that processes with unhandled signals that get ignored don't return
EINTR.

This can help with X startup issues:

    Fatal server error:
    xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call

although the real fix is having the X server always retry EINTR
regardless (since EINTR does happen for signals that have handlers
installed). Keithp has a patch for that.

Regardless, ERESTARTNOHAND is the correct thing to use.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2007-10-07 16:02:55 -07:00
parent fc8b28a65d
commit 70cb97935b
1 changed files with 2 additions and 2 deletions
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4
drivers/char/vt_ioctl.c
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@ -1032,7 +1032,7 @@ static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
/*
* Sleeps until a vt is activated, or the task is interrupted. Returns
* 0 if activation, -EINTR if interrupted.
* 0 if activation, -EINTR if interrupted by a signal handler.
*/
int vt_waitactive(int vt)
{
@ -1057,7 +1057,7 @@ int vt_waitactive(int vt)
break;
}
release_console_sem();
retval = -EINTR;
retval = -ERESTARTNOHAND;
if (signal_pending(current))
break;
schedule();