This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical  and  Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE  and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                   GETSOCKNAME(3POSIX)

       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.

       The getsockname() function shall fail if:

       EBADF  The socket argument is not a valid file descriptor.

       ENOTSOCK
              The socket argument does not refer to a socket.

       EOPNOTSUPP
              The operation is not supported for this socket's protocol.

       The getsockname() function may fail if:

       EINVAL The socket has been shut down.

       ENOBUFS
              Insufficient resources were available in the system to complete the function.

       Thefollowingsectionsareinformative.

       None.

       None.

       getsockname — get the socket name

       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.

       None.

       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.

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

       The Base Definitions volume of POSIX.1‐2017, <sys_socket.h>

       #include <sys/socket.h>

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