getsockname man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

getsockname — get the socket name


#include <sys/socket.h>

int getsockname(int socket, struct sockaddr *restrict address,
    socklen_t *restrict address_len);


The getsockname() function shall retrieve the locally-bound name of the specified socket, store this address in the sockaddr structure pointed to by the address argument, and store the length of this address in the object pointed to by the address_len argument.

The address_len argument points to a socklen_t object which on input specifies the length of the supplied sockaddr structure, and on output specifies the length of the stored address. If the actual length of the address is greater than the length of the supplied sockaddr structure, the stored address shall be truncated.

If the socket has not been bound to a local name, the value stored in the object pointed to by address is unspecified.

Return Value

Upon successful completion, 0 shall be returned, the address argument shall point to the address of the socket, and the address_len argument shall point to the length of the address. Otherwise, -1 shall be returned and errno set to indicate the error.


The getsockname() function shall fail if:

The socket argument is not a valid file descriptor.
The socket argument does not refer to a socket.
The operation is not supported for this socket's protocol.

The getsockname() function may fail if:

The socket has been shut down.
Insufficient resources were available in the system to complete the function.

The following sections are informative.

See Also

accept(), bind(), getpeername(), socket()

The Base Definitions volume of POSIX.1‐2008, <sys_socket.h>