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/* Definitions for communicating with a remote tape drive.
Copyright (C) 1988, 1992, 1996-1997, 2001, 2003-2004, 2007, 2023-2025 Free
Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
extern char const *rmt_command;
int rmt_open__ (const char *, int, int, const char *);
int rmt_close__ (int);
ptrdiff_t rmt_read__ (int, void *, idx_t);
idx_t rmt_write__ (int, void const *, idx_t);
off_t rmt_lseek__ (int, off_t, int);
int rmt_ioctl__ (int, unsigned long int, void *);
extern bool force_local_option;
_GL_INLINE_HEADER_BEGIN
#ifndef RMT_INLINE
# define RMT_INLINE _GL_INLINE
#endif
/* A filename is remote if it contains a colon not preceded by a slash,
to take care of '/:/' which is a shorthand for '/.../<CELL-NAME>/fs'
on machines running OSF's Distributing Computing Environment (DCE) and
Distributed File System (DFS). However, when --force-local, a
filename is never remote. */
RMT_INLINE bool
_remdev (char const *__dev_name)
{
if (force_local_option || *__dev_name == ':')
return false;
for (char const *__p = __dev_name; *__p && (*__p != '/'); __p++)
if (*__p == ':')
return true;
return false;
}
enum { __REM_BIAS = 1 << 30 };
RMT_INLINE bool
_isrmt (int __fd)
{
return __REM_BIAS <= __fd;
}
RMT_INLINE int
rmtopen (char const *__name, int __flags, mode_t __mode, char const *__command)
{
return (_remdev (__name)
? rmt_open__ (__name, __flags, __REM_BIAS, __command)
: open (__name, __flags, __mode));
}
RMT_INLINE int
rmtcreat (char const *__name, mode_t __mode, char const *__command)
{
return rmtopen (__name, O_CREAT | O_WRONLY | O_TRUNC, __mode, __command);
}
RMT_INLINE ptrdiff_t
rmtread (int __fd, void *__buffer, idx_t __length)
{
return (_isrmt (__fd)
? rmt_read__ (__fd - __REM_BIAS, __buffer, __length)
: safe_read (__fd, __buffer, __length));
}
RMT_INLINE idx_t
rmtwrite (int __fd, void const *__buffer, idx_t __length)
{
return (_isrmt (__fd)
? rmt_write__ (__fd - __REM_BIAS, __buffer, __length)
: full_write (__fd, __buffer, __length));
}
RMT_INLINE off_t
rmtlseek (int __fd, off_t __offset, int __whence)
{
return (_isrmt (__fd)
? rmt_lseek__ (__fd - __REM_BIAS, __offset, __whence)
: lseek (__fd, __offset, __whence));
}
RMT_INLINE int
rmtclose (int __fd)
{
return _isrmt (__fd) ? rmt_close__ (__fd - __REM_BIAS) : close (__fd);
}
RMT_INLINE int
rmtioctl (int __fd, unsigned long int __request, void *__argument)
{
return (_isrmt (__fd)
? rmt_ioctl__ (__fd - __REM_BIAS, __request, __argument)
: ioctl (__fd, __request, __argument));
}
_GL_INLINE_HEADER_END
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