/* 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> #if !defined __ASSUME_DEVPTS__ # 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 #endif /* 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" #if !defined __UNIX98PTY_ONLY__ /* Prototype for function that opens BSD-style master pseudo-terminals. */ int __bsd_getpt (void); #endif /* Open a master pseudo terminal and return its file descriptor. */ int getpt (void) { #if !defined __UNIX98PTY_ONLY__ static int have_no_dev_ptmx; #endif int fd; #if !defined __UNIX98PTY_ONLY__ if (!have_no_dev_ptmx) #endif { fd = open (_PATH_DEVPTMX, O_RDWR); if (fd != -1) { #if defined __ASSUME_DEVPTS__ return fd; #else 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); #if !defined __UNIX98PTY_ONLY__ have_no_dev_ptmx = 1; #endif #endif } else { #if !defined __UNIX98PTY_ONLY__ if (errno == ENOENT || errno == ENODEV) have_no_dev_ptmx = 1; else #endif return -1; } } #if !defined __UNIX98PTY_ONLY__ return __bsd_getpt (); #endif } #if !defined __UNIX98PTY_ONLY__ # define PTYNAME1 "pqrstuvwxyzabcde"; # define PTYNAME2 "0123456789abcdef"; # define __getpt __bsd_getpt # include "bsd_getpt.c" #endif