freebsd man page for getsockname

GETSOCKNAME(2)						      BSD System Calls Manual						    GETSOCKNAME(2)

NAME
     getsockname -- get socket name

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/socket.h>

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

DESCRIPTION
     The getsockname() system call returns the current name for the specified socket.  The namelen argument 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).

RETURN VALUES
     The getsockname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS
     The call succeeds unless:

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

     [ECONNRESET]	The connection has been reset by the peer.

     [EINVAL]		The value of the namelen argument is not valid.

     [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 argument points to memory not in a valid part of the process address space.

SEE ALSO
     bind(2), getpeername(2), socket(2)

HISTORY
     The getsockname() system call appeared in 4.2BSD.

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

BSD
								   June 4, 1993 							       BSD