1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* Copyright (C) 1998, 1999, 2001 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#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 (oflag)
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;
}
else
{
if (errno == ENOENT || errno == ENODEV)
have_no_dev_ptmx = 1;
else
return -1;
}
}
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>
|
