1 /* sendfile -- copy data directly from one file descriptor to another 2 Copyright (C) 1998-2022 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 33 extern ssize_t sendfile (int __out_fd, int __in_fd, off_t *__offset, 34 size_t __count) __THROW; 35 #else 36 # ifdef __REDIRECT_NTH 37 extern 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 45 extern 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 */ 52