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FreeBSD 11.0 - man page for getsockname (freebsd section 2)

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