1 | /* Copyright (C) 2011-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library 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 GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library. If not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <sys/sendfile.h> |
19 | #include <stddef.h> |
20 | #include <errno.h> |
21 | #include <sysdep.h> |
22 | |
23 | /* Send COUNT bytes from file associated with IN_FD starting at OFFSET to |
24 | descriptor OUT_FD. */ |
25 | ssize_t |
26 | sendfile (int out_fd, int in_fd, off_t *offset, size_t count) |
27 | { |
28 | __off64_t off64; |
29 | int rc; |
30 | |
31 | if (offset != NULL) |
32 | { |
33 | if (*offset < 0 || (off_t) (*offset + count) < 0) |
34 | { |
35 | __set_errno (EINVAL); |
36 | return -1; |
37 | } |
38 | off64 = *offset; |
39 | } |
40 | |
41 | rc = INLINE_SYSCALL (sendfile64, 4, out_fd, in_fd, |
42 | offset ? &off64 : NULL, count); |
43 | if (offset) |
44 | *offset = off64; |
45 | return rc; |
46 | } |
47 | |