* sysdeps/unix/sysv/linux/bits/sched.h: Declare sched_getcpu.
[glibc.git] / sysdeps / unix / sysv / linux / getpt.c
blobbb1ea4764355b06e8d875e0604d9cd2ed9618465
1 /* Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 #include <paths.h>
25 #include <sys/statfs.h>
27 #include "linux_fsinfo.h"
29 /* Path to the master pseudo terminal cloning device. */
30 #define _PATH_DEVPTMX _PATH_DEV "ptmx"
31 /* Directory containing the UNIX98 pseudo terminals. */
32 #define _PATH_DEVPTS _PATH_DEV "pts"
34 /* Prototype for function that opens BSD-style master pseudo-terminals. */
35 int __bsd_getpt (void);
37 /* Open a master pseudo terminal and return its file descriptor. */
38 int
39 __posix_openpt (oflag)
40 int oflag;
42 static int have_no_dev_ptmx;
43 int fd;
45 if (!have_no_dev_ptmx)
47 fd = __open (_PATH_DEVPTMX, oflag);
48 if (fd != -1)
50 struct statfs fsbuf;
51 static int devpts_mounted;
53 /* Check that the /dev/pts filesystem is mounted
54 or if /dev is a devfs filesystem (this implies /dev/pts). */
55 if (devpts_mounted
56 || (__statfs (_PATH_DEVPTS, &fsbuf) == 0
57 && fsbuf.f_type == DEVPTS_SUPER_MAGIC)
58 || (__statfs (_PATH_DEV, &fsbuf) == 0
59 && fsbuf.f_type == DEVFS_SUPER_MAGIC))
61 /* Everything is ok. */
62 devpts_mounted = 1;
63 return fd;
66 /* If /dev/pts is not mounted then the UNIX98 pseudo terminals
67 are not usable. */
68 __close (fd);
69 have_no_dev_ptmx = 1;
71 else
73 if (errno == ENOENT || errno == ENODEV)
74 have_no_dev_ptmx = 1;
75 else
76 return -1;
80 return -1;
82 weak_alias (__posix_openpt, posix_openpt)
85 int
86 __getpt (void)
88 int fd = __posix_openpt (O_RDWR);
89 if (fd == -1)
90 fd = __bsd_getpt ();
91 return fd;
95 #define PTYNAME1 "pqrstuvwxyzabcde";
96 #define PTYNAME2 "0123456789abcdef";
98 #define __getpt __bsd_getpt
99 #define HAVE_POSIX_OPENPT
100 #include <sysdeps/unix/bsd/getpt.c>