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-.\" Copyright (c) 1998, David Greenman
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice unmodified, this list of conditions, and the following
-.\"    disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	$Id: sendfile.2,v 1.1 1998/11/05 14:43:29 dg Exp $
-.\"
-.Dd November 5, 1998
-.Dt SENDFILE 2
-.Os
-.Sh NAME
-.Nm sendfile
-.Nd send a file to a socket
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/socket.h>
-.Fd #include <sys/uio.h>
-.Ft int
-.Fn sendfile "int fd" "int s" "off_t offset" "size_t nbytes" "struct sf_hdtr *hdtr" "off_t *sbytes" "int flags"
-.Sh DESCRIPTION
-.Fn Sendfile
-sends a regular file specified by descriptor
-.Fa fd
-out a stream socket specified by descriptor
-.Fa s .
-.Pp
-The
-.Fa offset
-argument specifies where to begin in the file. The
-.Fa nbytes
-argument specifies how many bytes of the file should be sent, with 0 having the special
-meaning of send until the end of file has been reached.
-.Pp
-An optional header and/or trailer can be sent before and after the file data by specifying
-a pointer to a struct sf_hdtr, which has the following structure:
-.Pp
-.Bd -literal -offset indent -compact
-struct sf_hdtr {
-	struct iovec *headers;	/* pointer to header iovecs */
-	int hdr_cnt;		/* number of header iovecs */
-	struct iovec *trailers;	/* pointer to trailer iovecs */
-	int trl_cnt;		/* number of trailer iovecs */
-};
-.Ed
-.Pp
-The
-.Fa headers
-and
-.Fa tailers
-pointers, if non-NULL, point to arrays of struct iovec structures. See the
-.Fn writev
-system call for information on the iovec structure. The number of iovecs in these
-arrays is specified by
-.Fa hdr_cnt
-and
-.Fa trl_cnt .
-.Pp
-If non-NULL, the system will write the total number of bytes sent on the socket to the
-variable pointed to by
-.Fa sbytes .
-.Pp
-The
-.Fa flags
-argument is currently undefined and should be specified as 0.
-.Pp
-When using a socket marked for non-blocking I/O,
-.Fn sendfile
-may send fewer bytes than requested. In this case, the number of bytes successfully
-written is returned in
-.Fa *sbytes
-(if specified),
-and the error
-.Er EAGAIN
-is returned.
-.Sh IMPLEMENTATION NOTES
-.Pp
-The FreeBSD implementation of
-.Fn sendfile
-is "zero-copy", meaning that it has been optimized so that copying of the file data is avoided.
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn sendfile
-returns 0. Otherwise a -1 is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Fa fd
-is not a valid file descriptor.
-.It Bq Er EBADF
-.Fa s
-is not a valid socket descriptor.
-.It Bq Er ENOTSOCK
-.Fa s
-is not a socket.
-.It Bq Er EINVAL
-.Fa fd
-is not a regular file.
-.It Bq Er EINVAL
-.Fa s
-is not a SOCK_STREAM type socket.
-.It Bq Er EINVAL
-.Fa offset
-is negative or out of range.
-.It Bq Er ENOTCONN
-.Fa s
-points to an unconnected socket.
-.It Bq Er EPIPE
-The socket peer has closed the connection.
-.It Bq Er EIO
-An error occurred while reading from
-.Fa fd .
-.It Bq Er EFAULT
-An invalid address was specified for a parameter.
-.It Bq Er EAGAIN
-The socket is marked for non-blocking I/O and not all data was sent due to the socket buffer being filled.
-If specified, the number of bytes successfully sent will be returned in
-.Fa *sbytes .
-.El
-.Sh SEE ALSO
-.Xr open 2 ,
-.Xr socket 2 ,
-.Xr send 2 ,
-.Xr writev 2
-.Sh HISTORY
-.Fn sendfile
-first appeared in FreeBSD 3.0.1.
-.Sh AUTHORS
-.Fn sendfile
-and this manual page were written by David Greenman <dg@root.com>.