That sounds good to me, thanks. On Sun, Sep 25, 2016 at 3:10 AM, Michael Kerrisk (man-pages) <mtk.manpages@xxxxxxxxx> wrote: > Hello Patrick > > On 09/24/2016 12:17 AM, Patrick McLean wrote: >> The FIONREAD ioctl can be used on a pipe to get the current amount of >> data in the pipe. This ioctl is currently only documented in tty_ioctl >> (4). This adds a blurb to the pipe(7) man page about this ioctl. > > Thanks for the patch. In the end, I wrote something more extensive. > See below. > > Cheers, > > Michael > > diff --git a/man7/pipe.7 b/man7/pipe.7 > index 9977acc..b6a3007 100644 > --- a/man7/pipe.7 > +++ b/man7/pipe.7 > @@ -143,6 +143,21 @@ operations. > See > .BR fcntl (2) > for more information. > + > +The following > +.BR ioctl (2) > +operation, which can be applied to a file descriptor > +that refers to either end of a pipe, > +places a count of the number of unread bytes in the pipe in the > +.I int > +buffer pointed to by the final argument of the call: > + > + ioctl(fd, FIONREAD, &nbytes); > + > +The > +.B FIONREAD > +operation is not specified in any standard, > +but is provided on many implementations. > > -- > Michael Kerrisk > Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ > Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
