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PIPE_BUF and read with SIZE < 0

From: Robert Millan
Subject: PIPE_BUF and read with SIZE < 0
Date: Wed, 23 Apr 2003 22:20:58 +0200
User-agent: Mutt/1.5.4i

hi there,

got a pair of questions:

- is the behaviour of read() undefined when the SIZE argument is a
negative value?
- on Glibc, what does read() do when SIZE is negative? it appears to me
that it's reading untill EOF, but i couldn't tell.

i ask this to clear out a bit on the PIPE_BUF porting issue. depending
on the response something like the below would or would not be ok:

#ifdef PIPE_BUF
   read(fd, buf, PIPE_BUF - 1);
   read(fd, buf, fpathconf (fd, _PC_PIPE_BUF) - 1);

Robert Millan

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