source: trunk/libs/newlib/src/libgloss/m68k/io-lseek.c @ 546

Last change on this file since 546 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 1.5 KB
Line 
1/*
2 * io-lseek.c --
3 *
4 * Copyright (c) 2006 CodeSourcery Inc
5 *
6 * The authors hereby grant permission to use, copy, modify, distribute,
7 * and license this software and its documentation for any purpose, provided
8 * that existing copyright notices are retained in all copies and that this
9 * notice is included verbatim in any distributions. No written agreement,
10 * license, or royalty fee is required for any of the authorized uses.
11 * Modifications to this software may be copyrighted by their authors
12 * and need not follow the licensing terms described here, provided that
13 * the new terms are clearly indicated on the first page of each file where
14 * they apply.
15 */
16
17#include <sys/types.h>
18#include <unistd.h>
19#include <errno.h>
20#define IO lseek
21#include "io.h"
22
23/*
24 * lseek -- reposition a file descriptor
25 * input parameters:
26 *   0 : file descriptor
27 *   1 : high word of offset
28 *   2 : low word of offset
29 *   3 : seek flag
30 * output parameters:
31 *   0 : high word of result
32 *   1 : low word of result
33 *   2 : errno
34 */
35
36off_t lseek (int fd, off_t offset, int whence)
37{
38#if HOSTED
39  gdb_parambuf_t parameters;
40  parameters[0] = (uint32_t) fd;
41  parameters[1] = (uint32_t) ((offset >> 32) & 0xffffffff);
42  parameters[2] = (uint32_t) (offset & 0xffffffff);
43  parameters[3] = __hosted_to_gdb_lseek_flags (whence);
44  __hosted (HOSTED_LSEEK, parameters);
45  errno = __hosted_from_gdb_errno (parameters[2]);
46  return ((uint64_t)parameters[0] << 32) | ((uint64_t)parameters[1]);
47#else
48  errno = ENOSYS;
49  return -1;
50#endif
51}
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