grantpt and ptsname man pages

grantpt and ptsname man pages

[Serge E. Hallyn]

Hi,

near as i can tell (from tests and code), ptsname and grantpt both
require the passed-in fd to exist in /dev/pts.  So if you pass in
an fd from a newinstance devpts mounted elsewhere things can go
wrong.  Particularly if the passed-in fd is for /other/dev/pts/0
and /dev/pts/0 does not exist, then grantpt and ptsname will return
-ENOENT.

The manpage should probably mention that.  I've not written anything
for it yet.  (Willing to, but not until this weekend I'm afraid.)

thanks,
-serge
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Re: grantpt and ptsname man pages

[Michael Kerrisk]

Hi Serge,

On Fri, Sep 30, 2011 at 2:03 AM, Serge E. Hallyn
<serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> wrote:
> Hi,
>
> near as i can tell (from tests and code), ptsname and grantpt both
> require the passed-in fd to exist in /dev/pts.  So if you pass in
> an fd from a newinstance devpts mounted elsewhere things can go
> wrong.  Particularly if the passed-in fd is for /other/dev/pts/0
> and /dev/pts/0 does not exist, then grantpt and ptsname will return
> -ENOENT.
>
> The manpage should probably mention that.  I've not written anything
> for it yet.  (Willing to, but not until this weekend I'm afraid.)

That'd be great!

Thanks,

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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