0-bytes read() blocks for standard fd's while it shouldn't

[Pino Toscano]

Hi,

while debugging, I discovered a problem a bug in read(): when called 
with nbyte = 0 for the fd's of stdin/out/err like:
  ret = read(0, buf, 0);
it blocks as if it would wait for data, while it should return 0 in 
absence of errors. That read() correctly returns 0 for an fd a regular 
file.

I didn't have much success in locating who is replying to the io_read 
for those fd's, so for now I'll just report the issue.

-- 
Pino Toscano

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