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/* Definitions for communicating with a remote tape drive.
Copyright (C) 1988, 1992, 1996, 1997, 2001, 2003, 2004 Free
Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
extern char *rmt_command;
extern char *rmt_dev_name__;
int rmt_open__ (const char *, int, int, const char *);
int rmt_close__ (int);
size_t rmt_read__ (int, char *, size_t);
size_t rmt_write__ (int, char *, size_t);
off_t rmt_lseek__ (int, off_t, int);
int rmt_ioctl__ (int, int, char *);
extern bool force_local_option;
/* A filename is remote if it contains a colon not preceded by a slash,
to take care of `/:/' which is a shorthand for `/.../<CELL-NAME>/fs'
on machines running OSF's Distributing Computing Environment (DCE) and
Distributed File System (DFS). However, when --force-local, a
filename is never remote. */
#define _remdev(dev_name) \
(!force_local_option && (rmt_dev_name__ = strchr (dev_name, ':')) \
&& rmt_dev_name__ > (dev_name) \
&& ! memchr (dev_name, '/', rmt_dev_name__ - (dev_name)))
#define _isrmt(fd) \
((fd) >= __REM_BIAS)
#define __REM_BIAS (1 << 30)
#ifndef O_CREAT
# define O_CREAT 01000
#endif
#define rmtopen(dev_name, oflag, mode, command) \
(_remdev (dev_name) ? rmt_open__ (dev_name, oflag, __REM_BIAS, command) \
: open (dev_name, oflag, mode))
#define rmtaccess(dev_name, amode) \
(_remdev (dev_name) ? 0 : access (dev_name, amode))
#define rmtstat(dev_name, buffer) \
(_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : stat (dev_name, buffer))
#define rmtcreat(dev_name, mode, command) \
(_remdev (dev_name) \
? rmt_open__ (dev_name, 1 | O_CREAT, __REM_BIAS, command) \
: creat (dev_name, mode))
#define rmtlstat(dev_name, muffer) \
(_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : lstat (dev_name, buffer))
#define rmtread(fd, buffer, length) \
(_isrmt (fd) ? rmt_read__ (fd - __REM_BIAS, buffer, length) \
: safe_read (fd, buffer, length))
#define rmtwrite(fd, buffer, length) \
(_isrmt (fd) ? rmt_write__ (fd - __REM_BIAS, buffer, length) \
: full_write (fd, buffer, length))
#define rmtlseek(fd, offset, where) \
(_isrmt (fd) ? rmt_lseek__ (fd - __REM_BIAS, offset, where) \
: lseek (fd, offset, where))
#define rmtclose(fd) \
(_isrmt (fd) ? rmt_close__ (fd - __REM_BIAS) : close (fd))
#define rmtioctl(fd, request, argument) \
(_isrmt (fd) ? rmt_ioctl__ (fd - __REM_BIAS, request, argument) \
: ioctl (fd, request, argument))
#define rmtdup(fd) \
(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : dup (fd))
#define rmtfstat(fd, buffer) \
(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fstat (fd, buffer))
#define rmtfcntl(cd, command, argument) \
(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fcntl (fd, command, argument))
#define rmtisatty(fd) \
(_isrmt (fd) ? 0 : isatty (fd))
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