getsockname - get socket name
Standard C library (libc, -lc)
#include <sys/socket.h>
int getsockname(int sockfd, struct sockaddr *restrict addr,
socklen_t *restrict addrlen);getsockname() returns the current address to which
the socket sockfd is bound, in the buffer pointed to by
addr. The 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 to indicate the error.
The argument sockfd is not a valid file descriptor.
The 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.
POSIX.1-2008.
POSIX.1-2001, SVr4, 4.4BSD (first appeared in 4.2BSD).