1/* sendfile -- copy data directly from one file descriptor to another
 2   Copyright (C) 1998-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef _SYS_SENDFILE_H
20#define _SYS_SENDFILE_H	1
21
22#include <features.h>
23#include <sys/types.h>
24
25__BEGIN_DECLS
26
27/* Send up to COUNT bytes from file associated with IN_FD starting at
28   *OFFSET to descriptor OUT_FD.  Set *OFFSET to the IN_FD's file position
29   following the read bytes.  If OFFSET is a null pointer, use the normal
30   file position instead.  Return the number of written bytes, or -1 in
31   case of error.  */
32#ifndef __USE_FILE_OFFSET64
33extern ssize_t sendfile (int __out_fd, int __in_fd, off_t *__offset,
34			 size_t __count) __THROW;
35#else
36# ifdef __REDIRECT_NTH
37extern ssize_t __REDIRECT_NTH (sendfile,
38			       (int __out_fd, int __in_fd, __off64_t *__offset,
39				size_t __count), sendfile64);
40# else
41#  define sendfile sendfile64
42# endif
43#endif
44#ifdef __USE_LARGEFILE64
45extern ssize_t sendfile64 (int __out_fd, int __in_fd, __off64_t *__offset,
46			   size_t __count) __THROW;
47#endif
48
49__END_DECLS
50
51#endif	/* sys/sendfile.h */