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

   1 /* Remote tape drive defines for tar.
   2    Copyright (C) 1988 Free Software Foundation
   3
   4 This file is part of GNU Tar.
   5
   6 GNU Tar 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 GNU Tar 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 GNU Tar; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if defined(HAVE_UNISTD_H)
  21 #include <unistd.h>
  22 #endif /* HAVE_UNISTD_H */
  23
  24 #if !defined(_POSIX_VERSION)
  25 #ifdef __MSDOS__
  26 #include <io.h>
  27 #else /* !__MSDOS__ */
  28 extern off_t lseek();
  29 #endif /* __MSDOS__ */
  30 #endif /* _POSIX_VERSION */
  31
  32 #ifdef NO_REMOTE
  33 #define _isrmt(f)       0
  34 #define rmtopen         open
  35 #define rmtaccess       access
  36 #define rmtstat         stat
  37 #define rmtcreat        creat
  38 #define rmtlstat        lstat
  39 #define rmtread         read
  40 #define rmtwrite        write
  41 #define rmtlseek        lseek
  42 #define rmtclose        close
  43 #define rmtioctl        ioctl
  44 #define rmtdup          dup
  45 #define rmtfstat        fstat
  46 #define rmtfcntl        fcntl
  47 #define rmtisatty       isatty
  48
  49 #else /* !NO_REMOTE */
  50
  51 #define __REM_BIAS      128
  52 #define RMTIOCTL
  53
  54 #ifndef O_CREAT
  55 #define O_CREAT 01000
  56 #endif
  57
  58 extern char *__rmt_path;
  59
  60 extern long __rmt_lseek();
  61
  62 #if !defined(USG) && !defined(STDC_HEADERS)
  63 #define strchr index
  64 #endif
  65 extern char *strchr();
  66
  67 #define _remdev(path)   ((__rmt_path=strchr(path, ':')) && strncmp(__rmt_path, ":/dev/", 6)==0)
  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 #endif /* !NO_REMOTE */