mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
15e9a4f378
If a link (say /proc/self/fd/0) pointing to a device, say /dev/pts/2, in a parent mount namespace is passed to ttyname, and a /dev/pts/2 exists (in a different devpts) in the current namespace, then it returns /dev/pts/2. But /dev/pts/2 is NOT the current tty, it is a different file and device. Detect this case and return ENODEV. Userspace can choose to take this as a hint that the fd points to a tty device but to act on the fd rather than the link. Signed-off-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* Copyright (C) 2016-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <sys/sysmacros.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
/* Return true if this is a UNIX98 pty device, as defined in
|
|
linux/Documentation/devices.txt. */
|
|
static inline int
|
|
is_pty (struct stat64 *sb)
|
|
{
|
|
#ifdef _STATBUF_ST_RDEV
|
|
int m = major (sb->st_rdev);
|
|
return (136 <= m && m <= 143);
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|