VMS Help TCPIP Services, Programming Interfaces, Sockets API, close()  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Closes a connection and deletes a socket descriptor.
    The $QIO equivalent is the $DASSGN system service.
    Format
      #include  <unixio.h>
      int close  ( s );

1 - Argument

 s
    A socket descriptor.

2 - Description

    This function deletes a descriptor from the per-process object
    (Compaq C structure) reference table. Associated TCP connections
    close first.
    If a call to the connect() function fails for a connection mode
    socket, applications should use close() to deallocate the socket
    and descriptor.
    Related Functions
    See also accept(), socket(),  and write().

3 - Return Values

    0                  Successful completion.
    -1                 Error; errno is set to indicate the error.

4 - Errors

    EBADF              The socket descriptor is invalid.
    EINTR              The close() function was interrupted by a
                       signal that was caught.