tar/src/rmt.h

/* Definitions for communicating with a remote tape drive.
   Copyright (C) 1988, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#if !defined(_POSIX_VERSION)
#ifdef __MSDOS__
#include <io.h>
#else /* !__MSDOS__ */
extern off_t lseek ();
#endif /* __MSDOS__ */
#endif /* _POSIX_VERSION */

#ifdef NO_REMOTE
#define _isrmt(f)	0
#define rmtopen		open
#define rmtaccess	access
#define rmtstat		stat
#define rmtcreat	creat
#define rmtlstat	lstat
#define rmtread		read
#define rmtwrite	write
#define rmtlseek	lseek
#define rmtclose	close
#define rmtioctl	ioctl
#define rmtdup		dup
#define rmtfstat	fstat
#define rmtfcntl	fcntl
#define rmtisatty	isatty

#else /* !NO_REMOTE */

#define __REM_BIAS	128
#define RMTIOCTL

#ifndef O_CREAT
#define O_CREAT	01000
#endif

extern char *__rmt_path;

#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
#ifndef index
#define index strchr
#endif
#else
extern char *index ();
#endif

#define _remdev(path)	(!f_force_local && (__rmt_path=index(path, ':')))
#define _isrmt(fd)		((fd) >= __REM_BIAS)

#define rmtopen(path,oflag,mode) (_remdev(path) ? __rmt_open(path, oflag, mode, __REM_BIAS) : open(path, oflag, mode))
#define rmtaccess(path, amode)	(_remdev(path) ? 0 : access(path, amode))
#define rmtstat(path, buf)	(_remdev(path) ? (errno = EOPNOTSUPP), -1 : stat(path, buf))
#define rmtcreat(path, mode)	(_remdev(path) ? __rmt_open (path, 1 | O_CREAT, mode, __REM_BIAS) : creat(path, mode))
#define rmtlstat(path,buf)	(_remdev(path) ? (errno = EOPNOTSUPP), -1 : lstat(path,buf))

#define rmtread(fd, buf, n)	(_isrmt(fd) ? __rmt_read(fd - __REM_BIAS, buf, n) : read(fd, buf, n))
#define rmtwrite(fd, buf, n)	(_isrmt(fd) ? __rmt_write(fd - __REM_BIAS, buf, n) : write(fd, buf, n))
#define rmtlseek(fd, off, wh)	(_isrmt(fd) ? __rmt_lseek(fd - __REM_BIAS, off, wh) : lseek(fd, off, wh))
#define rmtclose(fd)		(_isrmt(fd) ? __rmt_close(fd - __REM_BIAS) : close(fd))
#ifdef RMTIOCTL
#define rmtioctl(fd,req,arg)	(_isrmt(fd) ? __rmt_ioctl(fd - __REM_BIAS, req, arg) : ioctl(fd, req, arg))
#else
#define rmtioctl(fd,req,arg)	(_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : ioctl(fd, req, arg))
#endif
#define rmtdup(fd)		(_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : dup(fd))
#define rmtfstat(fd, buf)	(_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : fstat(fd, buf))
#define rmtfcntl(fd,cmd,arg)	(_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : fcntl (fd, cmd, arg))
#define rmtisatty(fd)		(_isrmt(fd) ? 0 : isatty(fd))

#undef RMTIOCTL

int __rmt_open ();
int __rmt_close ();
int __rmt_read ();
int __rmt_write ();
long __rmt_lseek ();
int __rmt_ioctl ();
#endif /* !NO_REMOTE */