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kernel: devpipe: fix error management on writes 

The "write on closed pipe" note should be posted only
if the write occurred on a closed pipe.

Before this fix, on any interrupt caused the note to be sent,
despite the pipe being open and fully working.
This commit is contained in:
Giacomo Tesio 2017-05-17 00:27:57 +02:00
parent 031201a1ac
commit 2b1baf8de1
2 changed files with 44 additions and 23 deletions
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66
sys/src/kern/port/devpipe.c
View File

@ -1,3 +1,20 @@
/*
* This file is part of Jehanne.
*
* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
*
* Jehanne is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* Jehanne is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
@ -300,31 +317,33 @@ static long
pipewrite(Chan *c, void *va, long n, int64_t _1)
{
Pipe *p;
Queue *q;
if(!islo())
jehanne_print("pipewrite hi %#p\n", getcallerpc());
if(waserror()) {
/* avoid notes when pipe is a mounted queue */
if((c->flag & CMSG) == 0)
postnote(up, 1, "sys: write on closed pipe", NUser);
nexterror();
}
p = c->aux;
switch(PIPETYPE(c->qid.path)){
case Qdata0:
n = qwrite(p->q[1], va, n);
q = p->q[1];
break;
case Qdata1:
n = qwrite(p->q[0], va, n);
q = p->q[0];
break;
default:
panic("pipewrite");
}
if(waserror()) {
/* avoid notes when pipe is a mounted queue */
if((c->flag & CMSG) == 0
&& (qstate(q) & Qclosed)
&& (jehanne_strcmp(Ehungup, up->errstr) == 0)) // do not obscure other errors
postnote(up, 1, "sys: write on closed pipe", NUser);
nexterror();
}
n = qwrite(q, va, n);
poperror();
return n;
}
@ -334,29 +353,30 @@ pipebwrite(Chan *c, Block *bp, int64_t _1)
{
long n;
Pipe *p;
if(waserror()) {
/* avoid notes when pipe is a mounted queue */
if((c->flag & CMSG) == 0)
postnote(up, 1, "sys: write on closed pipe", NUser);
nexterror();
}
Queue *q;
p = c->aux;
switch(PIPETYPE(c->qid.path)){
case Qdata0:
n = qbwrite(p->q[1], bp);
q = p->q[1];
break;
case Qdata1:
n = qbwrite(p->q[0], bp);
q = p->q[0];
break;
default:
n = 0;
panic("pipebwrite");
}
if(waserror()) {
/* avoid notes when pipe is a mounted queue */
if((c->flag & CMSG) == 0
&& (qstate(q) & Qclosed)
&& (jehanne_strcmp(Ehungup, up->errstr) == 0)) // do not obscure other errors
postnote(up, 1, "sys: write on closed pipe", NUser);
nexterror();
}
n = qbwrite(q, bp);
poperror();
return n;
}

1
sys/src/kern/port/portfns.h
View File

@ -314,6 +314,7 @@ void qreopen(Queue*);
void qsetbypass(Queue*, void (*)(void*, Block*), void*);
void qsetlimit(Queue*, int);
void qsleep(Queue*);
int qstate(Queue *q);
void qunlock(QLock*);
int qwindow(Queue*);
int qwrite(Queue*, void*, int);