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

   1 /* Definitions for communicating with a remote tape drive.
   2    Copyright (C) 1988, 1992 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
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #ifdef HAVE_UNISTD_H
  19 #include <unistd.h>
  20 #endif
  21
  22 #if !defined(_POSIX_VERSION)
  23 #ifdef __MSDOS__
  24 #include <io.h>
  25 #else /* !__MSDOS__ */
  26 extern off_t lseek ();
  27 #endif /* __MSDOS__ */
  28 #endif /* _POSIX_VERSION */
  29
  30 #ifdef NO_REMOTE
  31 #define _isrmt(f)       0
  32 #define rmtopen         open
  33 #define rmtaccess       access
  34 #define rmtstat         stat
  35 #define rmtcreat        creat
  36 #define rmtlstat        lstat
  37 #define rmtread         read
  38 #define rmtwrite        write
  39 #define rmtlseek        lseek
  40 #define rmtclose        close
  41 #define rmtioctl        ioctl
  42 #define rmtdup          dup
  43 #define rmtfstat        fstat
  44 #define rmtfcntl        fcntl
  45 #define rmtisatty       isatty
  46
  47 #else /* !NO_REMOTE */
  48
  49 #define __REM_BIAS      128
  50 #define RMTIOCTL
  51
  52 #ifndef O_CREAT
  53 #define O_CREAT 01000
  54 #endif
  55
  56 extern char *__rmt_path;
  57
  58 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
  59 #include <string.h>
  60 #ifndef index
  61 #define index strchr
  62 #endif
  63 #else
  64 extern char *index ();
  65 #endif
  66
  67 #define _remdev(path)   (!f_force_local && (__rmt_path=index(path, ':')))
  68 #define _isrmt(fd)              ((fd) >= __REM_BIAS)
  69
  70 #define rmtopen(path,oflag,mode) (_remdev(path) ? __rmt_open(path, oflag, mode, __REM_BIAS) : open(path, oflag, mode))
  71 #define rmtaccess(path, amode)  (_remdev(path) ? 0 : access(path, amode))
  72 #define rmtstat(path, buf)      (_remdev(path) ? (errno = EOPNOTSUPP), -1 : stat(path, buf))
  73 #define rmtcreat(path, mode)    (_remdev(path) ? __rmt_open (path, 1 | O_CREAT, mode, __REM_BIAS) : creat(path, mode))
  74 #define rmtlstat(path,buf)      (_remdev(path) ? (errno = EOPNOTSUPP), -1 : lstat(path,buf))
  75
  76 #define rmtread(fd, buf, n)     (_isrmt(fd) ? __rmt_read(fd - __REM_BIAS, buf, n) : read(fd, buf, n))
  77 #define rmtwrite(fd, buf, n)    (_isrmt(fd) ? __rmt_write(fd - __REM_BIAS, buf, n) : write(fd, buf, n))
  78 #define rmtlseek(fd, off, wh)   (_isrmt(fd) ? __rmt_lseek(fd - __REM_BIAS, off, wh) : lseek(fd, off, wh))
  79 #define rmtclose(fd)            (_isrmt(fd) ? __rmt_close(fd - __REM_BIAS) : close(fd))
  80 #ifdef RMTIOCTL
  81 #define rmtioctl(fd,req,arg)    (_isrmt(fd) ? __rmt_ioctl(fd - __REM_BIAS, req, arg) : ioctl(fd, req, arg))
  82 #else
  83 #define rmtioctl(fd,req,arg)    (_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : ioctl(fd, req, arg))
  84 #endif
  85 #define rmtdup(fd)              (_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : dup(fd))
  86 #define rmtfstat(fd, buf)       (_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : fstat(fd, buf))
  87 #define rmtfcntl(fd,cmd,arg)    (_isrmt(fd) ? (errno = EOPNOTSUPP), -1 : fcntl (fd, cmd, arg))
  88 #define rmtisatty(fd)           (_isrmt(fd) ? 0 : isatty(fd))
  89
  90 #undef RMTIOCTL
  91
  92 int __rmt_open ();
  93 int __rmt_close ();
  94 int __rmt_read ();
  95 int __rmt_write ();
  96 long __rmt_lseek ();
  97 int __rmt_ioctl ();
  98 #endif /* !NO_REMOTE */