Date: Sat, 14 Sep 1996 05:56:33 +1000 From: Bruce Evans <bde@zeta.org.au> To: cvs-all@freefall.freebsd.org, CVS-committers@freefall.freebsd.org, cvs-lib@freefall.freebsd.org, pst@freefall.freebsd.org Subject: Re: cvs commit: src/lib/libc/stdio funopen.3 Message-ID: <199609131956.FAA22959@godzilla.zeta.org.au>
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> Modified: lib/libc/stdio funopen.3
> Log:
> fwopen() argument type mis-described
>
> Obtained from: NetBSD lib/2751 (der Mouse)
Hmmm, the fwopen() and fropen() function arg types are mis-designed
- they are incompatible write() and read, e.g,:
ssize_t write (int fd, void const *buf, size_t nbytes);
||||||| |||| ||||||
int (*writefn) (void *cookie, char const *buf, int nbytes);
This matters if size_t is larger than int and if write() can sucessfully
return a negative count. It is easy to write a writefn that can
successfully returns a negative count and easy to return such a count
on a 16-bit system. __sfvwrite() misinterprets negative counts as
errors although the man page says that only -1 is an error.
Bruce
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