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/* Copyright (C) 2016-2021 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 <https://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdbool.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 (on linux < 4.10) or
linux/Documentation/admin-guide/devices.txt (on linux >= 4.10). */
static inline bool
is_pty (struct stat64 *sb)
{
#ifdef _STATBUF_ST_RDEV
int m = __gnu_dev_major (sb->st_rdev);
return (136 <= m && m <= 143);
#else
return false;
#endif
}
static inline bool
is_mytty (const struct stat64 *mytty, const struct stat64 *maybe)
{
return (maybe->st_ino == mytty->st_ino
&& maybe->st_dev == mytty->st_dev
#ifdef _STATBUF_ST_RDEV
&& S_ISCHR (maybe->st_mode)
&& maybe->st_rdev == mytty->st_rdev
#endif
);
}
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