1/* Definitions for communicating with a remote tape drive.
2
3   Copyright (C) 1988, 1992, 1996, 1997, 2001, 2003, 2004 Free
4   Software Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20extern char *rmt_command;
21extern char *rmt_dev_name__;
22
23int rmt_open__ (const char *, int, int, const char *);
24int rmt_close__ (int);
25size_t rmt_read__ (int, char *, size_t);
26size_t rmt_write__ (int, char *, size_t);
27off_t rmt_lseek__ (int, off_t, int);
28int rmt_ioctl__ (int, int, char *);
29
30extern bool force_local_option;
31
32/* A filename is remote if it contains a colon not preceded by a slash,
33   to take care of `/:/' which is a shorthand for `/.../<CELL-NAME>/fs'
34   on machines running OSF's Distributing Computing Environment (DCE) and
35   Distributed File System (DFS).  However, when --force-local, a
36   filename is never remote.  */
37
38#define _remdev(dev_name) \
39  (!force_local_option && (rmt_dev_name__ = strchr (dev_name, ':')) \
40   && rmt_dev_name__ > (dev_name) \
41   && ! memchr (dev_name, '/', rmt_dev_name__ - (dev_name)))
42
43#define _isrmt(fd) \
44  ((fd) >= __REM_BIAS)
45
46#define __REM_BIAS (1 << 30)
47
48#ifndef O_CREAT
49# define O_CREAT 01000
50#endif
51
52#define rmtopen(dev_name, oflag, mode, command) \
53  (_remdev (dev_name) ? rmt_open__ (dev_name, oflag, __REM_BIAS, command) \
54   : open (dev_name, oflag, mode))
55
56#define rmtaccess(dev_name, amode) \
57  (_remdev (dev_name) ? 0 : access (dev_name, amode))
58
59#define rmtstat(dev_name, buffer) \
60  (_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : stat (dev_name, buffer))
61
62#define rmtcreat(dev_name, mode, command) \
63   (_remdev (dev_name) \
64    ? rmt_open__ (dev_name, 1 | O_CREAT, __REM_BIAS, command) \
65    : creat (dev_name, mode))
66
67#define rmtlstat(dev_name, muffer) \
68  (_remdev (dev_name) ? (errno = EOPNOTSUPP), -1 : lstat (dev_name, buffer))
69
70#define rmtread(fd, buffer, length) \
71  (_isrmt (fd) ? rmt_read__ (fd - __REM_BIAS, buffer, length) \
72   : safe_read (fd, buffer, length))
73
74#define rmtwrite(fd, buffer, length) \
75  (_isrmt (fd) ? rmt_write__ (fd - __REM_BIAS, buffer, length) \
76   : full_write (fd, buffer, length))
77
78#define rmtlseek(fd, offset, where) \
79  (_isrmt (fd) ? rmt_lseek__ (fd - __REM_BIAS, offset, where) \
80   : lseek (fd, offset, where))
81
82#define rmtclose(fd) \
83  (_isrmt (fd) ? rmt_close__ (fd - __REM_BIAS) : close (fd))
84
85#define rmtioctl(fd, request, argument) \
86  (_isrmt (fd) ? rmt_ioctl__ (fd - __REM_BIAS, request, argument) \
87   : ioctl (fd, request, argument))
88
89#define rmtdup(fd) \
90  (_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : dup (fd))
91
92#define rmtfstat(fd, buffer) \
93  (_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fstat (fd, buffer))
94
95#define rmtfcntl(cd, command, argument) \
96  (_isrmt (fd) ? (errno = EOPNOTSUPP), -1 : fcntl (fd, command, argument))
97
98#define rmtisatty(fd) \
99  (_isrmt (fd) ? 0 : isatty (fd))
100