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Mostly some fixes from bde to start support for ASYNC I/O (SIGIO).

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Submitted by:	bde
This commit is contained in:
dyson 1996-10-11 02:27:30 +00:00
parent a61297ba87
commit a181da319a
1 changed files with 19 additions and 11 deletions
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30
sys/kern/sys_pipe.c
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@ -16,7 +16,7 @@
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: sys_pipe.c,v 1.19 1996/07/12 08:14:58 bde Exp $
* $Id: sys_pipe.c,v 1.20 1996/07/13 22:52:50 dyson Exp $
*/
#ifndef OLD_PIPE
@ -312,10 +312,18 @@ static __inline void
pipeselwakeup(cpipe)
struct pipe *cpipe;
{
struct proc *p;
if (cpipe->pipe_state & PIPE_SEL) {
cpipe->pipe_state &= ~PIPE_SEL;
selwakeup(&cpipe->pipe_sel);
}
if (cpipe->pipe_state & PIPE_ASYNC) {
if (cpipe->pipe_pgid < 0)
gsignal(-cpipe->pipe_pgid, SIGIO);
else if ((p = pfind(cpipe->pipe_pgid)) != NULL)
psignal(p, SIGIO);
}
}
/* ARGSUSED */
@ -329,7 +337,7 @@ pipe_read(fp, uio, cred)
struct pipe *rpipe = (struct pipe *) fp->f_data;
int error = 0;
int nread = 0;
int size;
u_int size;
++rpipe->pipe_busy;
while (uio->uio_resid) {
@ -337,11 +345,11 @@ pipe_read(fp, uio, cred)
* normal pipe buffer receive
*/
if (rpipe->pipe_buffer.cnt > 0) {
int size = rpipe->pipe_buffer.size - rpipe->pipe_buffer.out;
size = rpipe->pipe_buffer.size - rpipe->pipe_buffer.out;
if (size > rpipe->pipe_buffer.cnt)
size = rpipe->pipe_buffer.cnt;
if (size > uio->uio_resid)
size = uio->uio_resid;
if (size > (u_int) uio->uio_resid)
size = (u_int) uio->uio_resid;
if ((error = pipelock(rpipe,1)) == 0) {
error = uiomove( &rpipe->pipe_buffer.buffer[rpipe->pipe_buffer.out],
size, uio);
@ -363,8 +371,8 @@ pipe_read(fp, uio, cred)
} else if ((size = rpipe->pipe_map.cnt) &&
(rpipe->pipe_state & PIPE_DIRECTW)) {
caddr_t va;
if (size > uio->uio_resid)
size = uio->uio_resid;
if (size > (u_int) uio->uio_resid)
size = (u_int) uio->uio_resid;
if ((error = pipelock(rpipe,1)) == 0) {
va = (caddr_t) rpipe->pipe_map.kva + rpipe->pipe_map.pos;
error = uiomove(va, size, uio);
@ -480,11 +488,11 @@ pipe_build_write_buffer(wpipe, uio)
struct pipe *wpipe;
struct uio *uio;
{
int size;
u_int size;
int i;
vm_offset_t addr, endaddr, paddr;
size = uio->uio_iov->iov_len;
size = (u_int) uio->uio_iov->iov_len;
if (size > wpipe->pipe_buffer.size)
size = wpipe->pipe_buffer.size;
@ -953,11 +961,11 @@ pipe_ioctl(fp, cmd, data, p)
*(int *)data = mpipe->pipe_buffer.cnt;
return (0);
case SIOCSPGRP:
case TIOCSPGRP:
mpipe->pipe_pgid = *(int *)data;
return (0);
case SIOCGPGRP:
case TIOCGPGRP:
*(int *)data = mpipe->pipe_pgid;
return (0);