Re: [PATCH] process_vm_{read,write}v(3): initial man pages

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?

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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