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devdraw/OSX: correct access to reply buffer (fixes rpc tag crash)

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This commit is contained in:
Russ Cox 2008-10-08 14:59:32 -07:00
parent 6c99870701
commit 607880ce78
1 changed files with 4 additions and 0 deletions
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4
src/cmd/devdraw/osx-srv.c
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@ -289,6 +289,7 @@ runmsg(Wsysmsg *m)
/* /*
* Reply to m. * Reply to m.
*/ */
QLock replylock;
void void
replymsg(Wsysmsg *m) replymsg(Wsysmsg *m)
{ {
@ -303,6 +304,8 @@ replymsg(Wsysmsg *m)
if(trace) fprint(2, "-> %W\n", m); if(trace) fprint(2, "-> %W\n", m);
/* copy to output buffer */ /* copy to output buffer */
n = sizeW2M(m); n = sizeW2M(m);
qlock(&replylock);
if(n > nmbuf){ if(n > nmbuf){
free(mbuf); free(mbuf);
mbuf = malloc(n); mbuf = malloc(n);
@ -313,6 +316,7 @@ replymsg(Wsysmsg *m)
convW2M(m, mbuf, n); convW2M(m, mbuf, n);
if(write(4, mbuf, n) != n) if(write(4, mbuf, n) != n)
sysfatal("write: %r"); sysfatal("write: %r");
qunlock(&replylock);
} }
/* /*