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cmd/ld: skip 0-length write in cwrite

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The 0-length part is fine, but some callers that write 0 bytes
also pass nil as the data pointer, and the Plan 9 kernel kills the
process with 'invalid address in sys call' in that case.

R=ken2
CC=golang-dev
https://golang.org/cl/6862051
This commit is contained in:
Russ Cox 2012-12-06 00:00:20 -05:00
parent b46d56ae72
commit 9d2b0e86c8
1 changed files with 2 additions and 0 deletions
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2
src/cmd/ld/lib.c
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@ -1493,6 +1493,8 @@ void
cwrite(void *buf, int n) cwrite(void *buf, int n)
{ {
cflush(); cflush();
if(n <= 0)
return;
if(write(cout, buf, n) != n) { if(write(cout, buf, n) != n) {
diag("write error: %r"); diag("write error: %r");
errorexit(); errorexit();