The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/sendfile.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/sendfile.h

     1	/* sendfile -- copy data directly from one file descriptor to another
     2	   Copyright (C) 1998-2024 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 */