94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/* Definitions for communicating with a remote tape drive.
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Copyright 1988, 1992, 1996, 1997, 2001 Free 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_path__;
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int rmt_open__ PARAMS ((const char *, int, int, const char *));
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int rmt_close__ PARAMS ((int));
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ssize_t rmt_read__ PARAMS ((int, char *, size_t));
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ssize_t rmt_write__ PARAMS ((int, char *, size_t));
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off_t rmt_lseek__ PARAMS ((int, off_t, int));
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int rmt_ioctl__ PARAMS ((int, int, char *));
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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(Path) \
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(!force_local_option && (rmt_path__ = strchr (Path, ':')) \
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&& rmt_path__ > (Path) && ! memchr (Path, rmt_path__ - (Path), '/'))
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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(Path, Oflag, Mode, Command) \
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(_remdev (Path) ? rmt_open__ (Path, Oflag, __REM_BIAS, Command) \
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: open (Path, Oflag, Mode))
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#define rmtaccess(Path, Amode) \
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(_remdev (Path) ? 0 : access (Path, Amode))
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#define rmtstat(Path, Buffer) \
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(_remdev (Path) ? (errno = EOPNOTSUPP), -1 : stat (Path, Buffer))
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#define rmtcreat(Path, Mode, Command) \
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(_remdev (Path) \
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? rmt_open__ (Path, 1 | O_CREAT, __REM_BIAS, Command) \
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: creat (Path, Mode))
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#define rmtlstat(Path, Buffer) \
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(_remdev (Path) ? (errno = EOPNOTSUPP), -1 : lstat (Path, 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(Fd, 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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