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. */
25ssize_t
26sendfile (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

source code of glibc/sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c