On Fri, Apr 21, 2017 at 10:05:09PM +0200, Christian Brauner wrote: > Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx> > --- > man3/ttyname.3 | 18 +++++++++++++++++- > 1 file changed, 17 insertions(+), 1 deletion(-) > > diff --git a/man3/ttyname.3 b/man3/ttyname.3 > index 0be50c62a..f184b4505 100644 > --- a/man3/ttyname.3 > +++ b/man3/ttyname.3 > @@ -75,7 +75,7 @@ was too small to allow storing the pathname. > .\" glibc commit 15e9a4f378c8607c2ae1aa465436af4321db0e23 > .B ENODEV > File descriptor refers to a slave pseudoterminal device > -but the corresponding pathname could not be found. > +but the corresponding pathname could not be found (see NOTES). > .SH ATTRIBUTES > For an explanation of the terms used in this section, see > .BR attributes (7). > @@ -93,6 +93,22 @@ T} Thread safety MT-Safe > .TE > .SH CONFORMING TO > POSIX.1-2001, POSIX.1-2008, 4.2BSD. > +.SH NOTES > +Processes keeping a file descriptor to a > +.BR pts (4) > +device open when switching to > +.BR mount_namespaces (7) > +that use a different > +.IR /dev/ptmx > +instance may still accidently find that a device path of the same name > +for that file descriptor exists. However, this device path refers to a > +different device and thus cannot not be used to modify the device that s/to modify the device/to access the device/ -- ldv
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