sockfd_lookup(9) centos man page | unix.com

SOCKFD_LOOKUP(9)						 Linux Networking						  SOCKFD_LOOKUP(9)

NAME
       sockfd_lookup - Go from a file number to its socket slot

SYNOPSIS
       struct socket * sockfd_lookup(int fd, int * err);

ARGUMENTS
       fd
	   file handle

       err
	   pointer to an error code return

DESCRIPTION
       The file handle passed in is locked and the socket it is bound too is returned. If an error occurs the err pointer is overwritten with a
       negative errno code and NULL is returned. The function checks for both invalid handles and passing a handle which is not a socket.

       On a success the socket object pointer is returned.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  SOCKFD_LOOKUP(9)