bsd man page for getsockname

GETSOCKNAME(2)							System Calls Manual						    GETSOCKNAME(2)

NAME
       getsockname - get socket name

SYNOPSIS
       getsockname(s, name, namelen)
       int s;
       struct sockaddr *name;
       int *namelen;

DESCRIPTION
       Getsockname returns the current name for the specified socket.  The namelen parameter should be initialized to indicate the amount of space
       pointed to by name.  On return it contains the actual size of the name returned (in bytes).

DIAGNOSTICS
       A 0 is returned if the call succeeds, -1 if it fails.

ERRORS
       The call succeeds unless:

       [EBADF]	      The argument s is not a valid descriptor.

       [ENOTSOCK]     The argument s is a file, not a socket.

       [ENOBUFS]      Insufficient resources were available in the system to perform the operation.

       [EFAULT]       The name parameter points to memory not in a valid part of the process address space.

SEE ALSO
       bind(2), socket(2)

BUGS
       Names bound to sockets in the UNIX domain are inaccessible; getsockname returns a zero length name.

4.2 Berkeley Distribution					   May 15, 1985 						    GETSOCKNAME(2)