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GETSOCKNAME(2) System Calls Manual GETSOCKNAME(2)

getsockname — get socket name

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

() 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).

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

The call succeeds unless:

[]
The argument s is not a valid descriptor.
[]
The argument s is a file, not a socket.
[]
Insufficient resources were available in the system to perform the operation.
[]
The name parameter points to memory not in a valid part of the process address space.

bind(2), socket(2)

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

The getsockname function call appeared in 4.2BSD.

BSD 4.2 June 4, 1993 GETSOCKNAME(2)