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fix edit pipe bug

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This commit is contained in:
rsc 2006-05-05 04:55:14 +00:00
parent 11b0772a33
commit 6630175602
3 changed files with 48 additions and 2 deletions
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18
src/cmd/acme/ecmd.c
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@ -592,6 +592,7 @@ runpipe(Text *t, int cmd, Rune *cr, int ncr, int state)
int n;
Runestr dir;
Window *w;
QLock *q;
r = skipbl(cr, ncr, &n);
if(n == 0)
@ -626,6 +627,23 @@ runpipe(Text *t, int cmd, Rune *cr, int ncr, int state)
winunlock(t->w);
qunlock(&row.lk);
recvul(cedit);
/*
* The editoutlk exists only so that we can tell when
* the editout file has been closed. It can get closed *after*
* the process exits because, since the process cannot be
* connected directly to editout (no 9P kernel support),
* the process is actually connected to a pipe to another
* process (arranged via 9pserve) that reads from the pipe
* and then writes the data in the pipe to editout using
* 9P transactions. This process might still have a couple
* writes left to copy after the original process has exited.
*/
if(w)
q = &w->editoutlk;
else
q = &editoutlk;
qlock(q); /* wait for file to close */
qunlock(q);
qlock(&row.lk);
editing = Inactive;
if(t!=nil && t->w!=nil)