Manual Pages  — GETSOCKNAME

getsockname – get socket name

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO HISTORY BUGS

Standard C Library (libc, -lc)

#include <sys/types.h>

#include <sys/socket.h>

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

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).

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.

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.

The getsockname() system call appeared in BSD 4.2 .

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