io_sendfile man page on Alpinelinux

io_sendfile man page on Alpinelinux

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io_sendfile(3)							io_sendfile(3)

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  operat‐
       ing  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)

								io_sendfile(3)

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