GETSOCKNAME(2)

NAME
getsockname - get socket name

SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
int
getsockname(int s, struct sockaddr *name, int *namelen);

DESCRIPTION
Getsockname() 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).

IMPLEMENTATION NOTES

In the non-threaded library getsockname() is implemented as the getsockname syscall.

In the threaded library, the getsockname syscall is assembled to _thread_sys_getsockname() and getsockname() is implemented as a function which locks fd for read and write, then calls _thread_sys_getsockname(). Before returning, getsockname() unlocks fd.

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

ERRORS
The call succeeds unless:

[EBADF]
    The argument s is not a valid descriptor.

[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 parameter points to memory not in a valid part of the process address space.

SEE ALSO
bind(2), getpeername(2), socket(2)

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

HISTORY
The getsockname() function call appeared in 4.2BSD.