diff options
Diffstat (limited to 'libc/stdlib/getpt.c')
| -rw-r--r-- | libc/stdlib/getpt.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/libc/stdlib/getpt.c b/libc/stdlib/getpt.c new file mode 100644 index 000000000..74f009a95 --- /dev/null +++ b/libc/stdlib/getpt.c @@ -0,0 +1,89 @@ +/* Copyright (C) 1998, 1999 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> + +/* Constant that identifies the `devpts' filesystem. */ +#define DEVPTS_SUPER_MAGIC 0x1cd1 +/* Constant that identifies the `devfs' filesystem. */ +#define DEVFS_SUPER_MAGIC 0x1373 + +/* 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 +getpt (void) +{ + static int have_no_dev_ptmx; + int fd; + + if (!have_no_dev_ptmx) + { + fd = open (_PATH_DEVPTMX, O_RDWR); + 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 __bsd_getpt (); +} + +#define PTYNAME1 "pqrstuvwxyzabcde"; +#define PTYNAME2 "0123456789abcdef"; + +#define __getpt __bsd_getpt +#include <bsd_getpt.c> |