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PR/34129: Andreas Gustafsson: Nonblocking write to pty can return 0 

If we cannot write on the slave side, always return EWOULDBLOCK in the
non-blocking case, because we don't know that the buffer we started
writing is actually in a system call boundary.
This commit is contained in:
christos 2006-08-03 22:51:05 +00:00
parent 740d87bac5
commit cf3258890d
1 changed files with 3 additions and 3 deletions
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6
sys/kern/tty.c
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@ -1,4 +1,4 @@
/* $NetBSD: tty.c,v 1.186 2006/07/23 22:06:11 ad Exp $ */ /* $NetBSD: tty.c,v 1.187 2006/08/03 22:51:05 christos Exp $ */
/*- /*-
* Copyright (c) 1982, 1986, 1990, 1991, 1993 * Copyright (c) 1982, 1986, 1990, 1991, 1993
@ -37,7 +37,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.186 2006/07/23 22:06:11 ad Exp $"); __KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.187 2006/08/03 22:51:05 christos Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -2100,7 +2100,7 @@ ttwrite(struct tty *tp, struct uio *uio, int flag)
if (flag & IO_NDELAY) { if (flag & IO_NDELAY) {
TTY_UNLOCK(tp); TTY_UNLOCK(tp);
splx(s); splx(s);
error = (uio->uio_resid == cnt) ? EWOULDBLOCK : 0; error = EWOULDBLOCK;
goto out; goto out;
} }
SET(tp->t_state, TS_ASLEEP); SET(tp->t_state, TS_ASLEEP);