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rmt.h
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C/C++ Source or Header
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1996-09-28
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96 lines
/* 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. */
extern char *__rmt_path;
int __rmt_open __P ((const char *, int, int, const char *));
int __rmt_close __P ((int));
int __rmt_read __P ((int, char *, unsigned int));
int __rmt_write __P ((int, char *, unsigned int));
long __rmt_lseek __P ((int, off_t, int));
int __rmt_ioctl __P ((int, int, char *));
/* A filename is remote if it contains a colon not preceeded 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.
[Which system? What is DCE? What is DFS?] */
#define _remdev(Path) \
(!flag_force_local && (__rmt_path = strchr (Path, ':')) \
&& __rmt_path > (Path) && __rmt_path[-1] != '/')
#define _isrmt(Fd) \
((Fd) >= __REM_BIAS)
#define __REM_BIAS 128
#ifndef O_CREAT
#define O_CREAT 01000
#endif
#define rmtopen(Path, Oflag, Mode, Command) \
(_remdev (Path) ? __rmt_open (Path, Oflag, __REM_BIAS, Command) \
: open (Path, Oflag, Mode))
#define rmtaccess(Path, Amode) \
(_remdev (Path) ? 0 : access (Path, Amode))
#define rmtstat(Path, Buffer) \
(_remdev (Path) ? (errno = EOPNOTSUPP), -1 : stat (Path, Buffer))
#define rmtcreat(Path, Mode, Command) \
(_remdev (Path) \
? __rmt_open (Path, 1 | O_CREAT, __REM_BIAS, Command) \
: creat (Path, Mode))
#define rmtlstat(Path, Buffer) \
(_remdev (Path) ? (errno = EOPNOTSUPP), -1 : lstat (Path, Buffer))
#define rmtread(Fd, Buffer, Length) \
(_isrmt (Fd) ? __rmt_read (Fd - __REM_BIAS, Buffer, Length) \
: read (Fd, Buffer, Length))
#define rmtwrite(Fd, Buffer, Length) \
(_isrmt (Fd) ? __rmt_write (Fd - __REM_BIAS, Buffer, Length) \
: 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(Fd, Command, Argument) \
(_isrmt (Fd) ? (errno = EOPNOTSUPP), -1 : fcntl (Fd, Command, Argument))
#define rmtisatty(Fd) \
(_isrmt (Fd) ? 0 : isatty (Fd))