Dogcows Code - chaz/tar/blob - src/rmt.h

   1 /* Definitions for communicating with a remote tape drive.
   2    Copyright (C) 1988, 1992, 1996, 1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 extern char *rmt_path__;
  19
  20 int rmt_open__ PARAMS ((const char *, int, int, const char *));
  21 int rmt_close__ PARAMS ((int));
  22 ssize_t rmt_read__ PARAMS ((int, char *, size_t));
  23 ssize_t rmt_write__ PARAMS ((int, char *, size_t));
  24 off_t rmt_lseek__ PARAMS ((int, off_t, int));
  25 int rmt_ioctl__ PARAMS ((int, int, char *));
  26
  27 /* A filename is remote if it contains a colon not preceded by a slash,
  28    to take care of `/:/' which is a shorthand for `/.../<CELL-NAME>/fs'
  29    on machines running OSF's Distributing Computing Environment (DCE) and
  30    Distributed File System (DFS).  However, when --force-local, a
  31    filename is never remote.  */
  32
  33 #define _remdev(Path) \
  34   (!force_local_option && (rmt_path__ = strchr (Path, ':')) \
  35    && rmt_path__ > (Path) && rmt_path__[-1] != '/')
  36
  37 #define _isrmt(Fd) \
  38   ((Fd) >= __REM_BIAS)
  39
  40 #define __REM_BIAS (1 << 30)
  41
  42 #ifndef O_CREAT
  43 # define O_CREAT 01000
  44 #endif
  45
  46 #define rmtopen(Path, Oflag, Mode, Command) \
  47   (_remdev (Path) ? rmt_open__ (Path, Oflag, __REM_BIAS, Command) \
  48    : open (Path, Oflag, Mode))
  49
  50 #define rmtaccess(Path, Amode) \
  51   (_remdev (Path) ? 0 : access (Path, Amode))
  52
  53 #define rmtstat(Path, Buffer) \
  54   (_remdev (Path) ? (errno = EOPNOTSUPP), -1 : stat (Path, Buffer))
  55
  56 #define rmtcreat(Path, Mode, Command) \
  57    (_remdev (Path) \
  58     ? rmt_open__ (Path, 1 | O_CREAT, __REM_BIAS, Command) \
  59     : creat (Path, Mode))
  60
  61 #define rmtlstat(Path, Buffer) \
  62   (_remdev (Path) ? (errno = EOPNOTSUPP), -1 : lstat (Path, Buffer))
  63
  64 #define rmtread(Fd, Buffer, Length) \
  65   (_isrmt (Fd) ? rmt_read__ (Fd - __REM_BIAS, Buffer, Length) \
  66    : safe_read (Fd, Buffer, Length))
  67
  68 #define rmtwrite(Fd, Buffer, Length) \
  69   (_isrmt (Fd) ? rmt_write__ (Fd - __REM_BIAS, Buffer, Length) \
  70    : full_write (Fd, Buffer, Length))
  71
  72 #define rmtlseek(Fd, Offset, Where) \
  73   (_isrmt (Fd) ? rmt_lseek__ (Fd - __REM_BIAS, Offset, Where) \
  74    : lseek (Fd, Offset, Where))
  75
  76 #define rmtclose(Fd) \
  77   (_isrmt (Fd) ? rmt_close__ (Fd - __REM_BIAS) : close (Fd))
  78
  79 #define rmtioctl(Fd, Request, Argument) \
  80   (_isrmt (Fd) ? rmt_ioctl__ (Fd - __REM_BIAS, Request, Argument) \
  81    : ioctl (Fd, Request, Argument))
  82
  83 #define rmtdup(Fd) \
  84   (_isrmt (Fd) ? (errno = EOPNOTSUPP), -1 : dup (Fd))
  85
  86 #define rmtfstat(Fd, Buffer) \
  87   (_isrmt (Fd) ? (errno = EOPNOTSUPP), -1 : fstat (Fd, Buffer))
  88
  89 #define rmtfcntl(Fd, Command, Argument) \
  90   (_isrmt (Fd) ? (errno = EOPNOTSUPP), -1 : fcntl (Fd, Command, Argument))
  91
  92 #define rmtisatty(Fd) \
  93   (_isrmt (Fd) ? 0 : isatty (Fd))