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On Wed, Dec 10, 2003 at 03:27:21AM +0100, Christian Biere wrote:
> Bill Studenmund wrote:
> > Then I get back the number of bytes read. If I get < 0, I got an error.
>=20
> Well, the same manpage also says:
>=20
> CAVEATS
>      Error checks should explicitly test for -1.  Code such as
>=20
>              while ((nr =3D read(fd, buf, sizeof(buf))) > 0)
>=20
>      is not maximally portable, as some platforms allow for nbytes to ran=
ge
>      between SSIZE_MAX and SIZE_MAX - 2, in which case the return value o=
f an
>      error-free read() may appear as a negative number distinct from -1.
>      Proper loops should use
>=20
>              while ((nr =3D read(fd, buf, sizeof(buf))) !=3D -1 && nr !=
=3D 0)

You are technically correct. However I will never pass a read size=20
greater than SSIZE_MAX - 1, so -1 is the only valid negative value for=20
read to return. :-)

Take care,

Bill

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