Subversion Repositories openrisc

/*

 * io-lseek.c --

 *

 * Copyright (c) 2006 CodeSourcery Inc

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include <sys/types.h>

#include <unistd.h>

#include <errno.h>

#define IO lseek

#include "io.h"

/*

 * lseek -- reposition a file descriptor

 * input parameters:

 *   0 : file descriptor

 *   1 : high word of offset

 *   2 : low word of offset

 *   3 : seek flag

 * output parameters:

 *   0 : high word of result

 *   1 : low word of result

 *   2 : errno

 */

off_t lseek (int fd, off_t offset, int whence)

{

#if HOSTED

  gdb_parambuf_t parameters;

  parameters[0] = (uint32_t) fd;

  parameters[1] = (uint32_t) ((offset >> 32) & 0xffffffff);

  parameters[2] = (uint32_t) (offset & 0xffffffff);

  parameters[3] = __hosted_to_gdb_lseek_flags (whence);

  __hosted (HOSTED_LSEEK, parameters);

  errno = __hosted_from_gdb_errno (parameters[2]);

  return ((uint64_t)parameters[0] << 32) | ((uint64_t)parameters[1]);

#else

  errno = ENOSYS;

  return -1;

#endif

}