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glibc/sysdeps/unix/sysv/linux/getpt.c
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/* Copyright (C) 1998-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. | |
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; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <paths.h> | |
#include <sys/statfs.h> | |
#include "linux_fsinfo.h" | |
/* Path to the master pseudo terminal cloning device. */ | |
#define _PATH_DEVPTMX _PATH_DEV "ptmx" | |
/* Directory containing the UNIX98 pseudo terminals. */ | |
#define _PATH_DEVPTS _PATH_DEV "pts" | |
/* Prototype for function that opens BSD-style master pseudo-terminals. */ | |
int __bsd_getpt (void); | |
/* Open a master pseudo terminal and return its file descriptor. */ | |
int | |
__posix_openpt (int oflag) | |
{ | |
static int have_no_dev_ptmx; | |
int fd; | |
if (!have_no_dev_ptmx) | |
{ | |
fd = __open (_PATH_DEVPTMX, oflag); | |
if (fd != -1) | |
{ | |
struct statfs fsbuf; | |
static int devpts_mounted; | |
/* Check that the /dev/pts filesystem is mounted | |
or if /dev is a devfs filesystem (this implies /dev/pts). */ | |
if (devpts_mounted | |
|| (__statfs (_PATH_DEVPTS, &fsbuf) == 0 | |
&& fsbuf.f_type == DEVPTS_SUPER_MAGIC) | |
|| (__statfs (_PATH_DEV, &fsbuf) == 0 | |
&& fsbuf.f_type == DEVFS_SUPER_MAGIC)) | |
{ | |
/* Everything is ok. */ | |
devpts_mounted = 1; | |
return fd; | |
} | |
/* If /dev/pts is not mounted then the UNIX98 pseudo terminals | |
are not usable. */ | |
__close (fd); | |
have_no_dev_ptmx = 1; | |
__set_errno (ENOENT); | |
} | |
else | |
{ | |
if (errno == ENOENT || errno == ENODEV) | |
have_no_dev_ptmx = 1; | |
else | |
return -1; | |
} | |
} | |
else | |
__set_errno (ENOENT); | |
return -1; | |
} | |
weak_alias (__posix_openpt, posix_openpt) | |
int | |
__getpt (void) | |
{ | |
int fd = __posix_openpt (O_RDWR); | |
if (fd == -1) | |
fd = __bsd_getpt (); | |
return fd; | |
} | |
#define PTYNAME1 "pqrstuvwxyzabcde"; | |
#define PTYNAME2 "0123456789abcdef"; | |
#define __getpt __bsd_getpt | |
#define HAVE_POSIX_OPENPT | |
#include <sysdeps/unix/bsd/getpt.c> |