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.TH socket_sendfile 3
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.SH NAME
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socket_sendfile \- send a file over a TCP socket
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.SH SYNTAX
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.B #include <socket.h>
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int \fBsocket_sendfile\fP(int \fIout\fR, int \fIin\fR, uint32 \fIoffset\fR,
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uint32 \fIbytes\fR);
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.SH DESCRIPTION
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socket_sendfile sends \fIbytes\fR bytes starting at \fIoffset\fR in the
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file \fIin\fR to the socket connected to file descriptor \fIout\fR.
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The socket must be connected.
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Note that the underlying sendfile system call is system specific and
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currently only implemented on Linux. On other operating systems, it is
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emulated with a read/write loop.
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.SH RETURN VALUE
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socket_sendfile returns 0 if the data was sent successfully. If not,
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it returns -1 and sets errno appropriately.
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.SH EXAMPLE
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#include <socket.h>
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#include <open.h>
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int \fIs\fR;
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char \fIip\fR[4];
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uint16 \fIp\fR;
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int \fIfd\fR = open_read("/etc/passwd");
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\fIs\fR = socket_tcp4();
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socket_connect4(s,ip,p);
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socket_sendfile(s,fd,0,23);
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.SH "SEE ALSO"
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socket_send6(3)
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