On Tue, 20 Mar 2012 19:30:29 +1300
"Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx> wrote:
> And another question about a different part of the page:
>
> > +.SH "RETURN VALUE"
> > +On success,
> > +.BR process_vm_readv ()
> > +returns the number of bytes read while
> > +.BR process_vm_writev ()
> > +returns the number of bytes written.
> > +
> > +On error, the number of bytes read or written is returned, or -1 is
> > +returned if it was unable to read/write any bytes; in either case,
> > +.I errno
> > +is set appropriately.
>
> Is that last piece really true? On error, how does the syscall return
> number of bytes read or written *and* set errno?
Sorry the original was badly written on my part.
On error, one of two things will happen:
- number of bytes read or written returned if a partial read/write
occurred OR
- -1 returned and errno set appropriately
Regards,
Chris
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