100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
/* Definitions for communicating with a remote tape drive.
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Copyright (C) 1988, 1992, 1996, 1997, 2001, 2003, 2004 Free
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Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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extern char *rmt_command;
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extern char *rmt_dev_name__;
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int rmt_open__ (const char *, int, int, const char *);
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int rmt_close__ (int);
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size_t rmt_read__ (int, char *, size_t);
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size_t rmt_write__ (int, char *, size_t);
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off_t rmt_lseek__ (int, off_t, int);
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int rmt_ioctl__ (int, int, char *);
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extern bool force_local_option;
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/* A filename is remote if it contains a colon not preceded by a slash,
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to take care of `/:/' which is a shorthand for `/.../<CELL-NAME>/fs'
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on machines running OSF's Distributing Computing Environment (DCE) and
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Distributed File System (DFS). However, when --force-local, a
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filename is never remote. */
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#define _remdev(dev_name) \
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(!force_local_option && (rmt_dev_name__ = strchr (dev_name, ':')) \
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&& rmt_dev_name__ > (dev_name) \
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&& ! memchr (dev_name, '/', rmt_dev_name__ - (dev_name)))
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#define _isrmt(fd) \
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((fd) >= __REM_BIAS)
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#define __REM_BIAS (1 << 30)
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#ifndef O_CREAT
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# define O_CREAT 01000
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#endif
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#define rmtopen(dev_name, oflag, mode, command) \
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(_remdev (dev_name) ? rmt_open__ (dev_name, oflag, __REM_BIAS, command) \
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: open (dev_name, oflag, mode))
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#define rmtaccess(dev_name, amode) \
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(_remdev (dev_name) ? 0 : access (dev_name, amode))
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#define rmtstat(dev_name, buffer) \
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(_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : stat (dev_name, buffer))
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#define rmtcreat(dev_name, mode, command) \
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(_remdev (dev_name) \
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? rmt_open__ (dev_name, 1 | O_CREAT, __REM_BIAS, command) \
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: creat (dev_name, mode))
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#define rmtlstat(dev_name, muffer) \
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(_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : lstat (dev_name, buffer))
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#define rmtread(fd, buffer, length) \
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(_isrmt (fd) ? rmt_read__ (fd - __REM_BIAS, buffer, length) \
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: safe_read (fd, buffer, length))
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#define rmtwrite(fd, buffer, length) \
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(_isrmt (fd) ? rmt_write__ (fd - __REM_BIAS, buffer, length) \
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: full_write (fd, buffer, length))
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#define rmtlseek(fd, offset, where) \
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(_isrmt (fd) ? rmt_lseek__ (fd - __REM_BIAS, offset, where) \
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: lseek (fd, offset, where))
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#define rmtclose(fd) \
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(_isrmt (fd) ? rmt_close__ (fd - __REM_BIAS) : close (fd))
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#define rmtioctl(fd, request, argument) \
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(_isrmt (fd) ? rmt_ioctl__ (fd - __REM_BIAS, request, argument) \
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: ioctl (fd, request, argument))
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#define rmtdup(fd) \
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(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : dup (fd))
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#define rmtfstat(fd, buffer) \
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(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fstat (fd, buffer))
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#define rmtfcntl(cd, command, argument) \
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(_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fcntl (fd, command, argument))
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#define rmtisatty(fd) \
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(_isrmt (fd) ? 0 : isatty (fd))
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