NAME¶
io_sendfile - send data from a file to a socket
SYNTAX¶
#include <io.h>
int64
io_sendfile(int64 sock,int64 fd,uint64 off,uint64 n);
DESCRIPTION¶
io_sendfile sends data from a file to a socket. This function tries to do this
in a way that allows high quality operating systems to do zero-copy TCP
(serving the data without copying the file contents to user space or inside
kernel space). This function will use special operating system
"sendfile" primitives where available and use memory mapped I/O
otherwise. It should always be faster than using read() and write() to copy
the data yourself.
io_sendfile will return the number of bytes sent. If an error occurred, it will
return -1 for EAGAIN, or -3 otherwise.
SEE ALSO¶
io_wait(3),
io_waituntil(3)