getsockname - get socket name
#include <sys/socket.h> int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
getsockname() returns the current address to which the socket
sockfd is bound, in the buffer pointed to by
addrlen argument should be initialized to indicate the amount of space (in bytes) pointed to by
addr. On return it contains the actual size of the socket address.
The returned address is truncated if the buffer provided is too small; in this case,
addrlen will return a value greater than was supplied to the call.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
sockfd is not a valid file descriptor.
addr argument points to memory not in a valid part of the process address space.
addrlen is invalid (e.g., is negative).
Insufficient resources were available in the system to perform the operation.
The file descriptor
sockfd does not refer to a socket.
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