SHUTDOWN(3)                POSIX Programmer's Manual               SHUTDOWN(3)



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

NAME
       shutdown -- shut down socket send and receive operations

SYNOPSIS
       #include <sys/socket.h>

       int shutdown(int socket, int how);

DESCRIPTION
       The shutdown() function shall cause all or part of a full-duplex
       connection on the socket associated with the file descriptor socket to
       be shut down.

       The shutdown() function takes the following arguments:

       socket      Specifies the file descriptor of the socket.

       how         Specifies the type of shutdown. The values are as follows:

                   SHUT_RD     Disables further receive operations.

                   SHUT_WR     Disables further send operations.

                   SHUT_RDWR   Disables further send and receive operations.

       The shutdown() function disables subsequent send and/or receive
       operations on a socket, depending on the value of the how argument.

RETURN VALUE
       Upon successful completion, shutdown() shall return 0; otherwise, -1
       shall be returned and errno set to indicate the error.

ERRORS
       The shutdown() function shall fail if:

       EBADF  The socket argument is not a valid file descriptor.

       EINVAL The how argument is invalid.

       ENOTCONN
              The socket is not connected.

       ENOTSOCK
              The socket argument does not refer to a socket.

       The shutdown() function may fail if:

       ENOBUFS
              Insufficient resources were available in the system to perform
              the operation.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getsockopt(), pselect(), read(), recv(), recvfrom(), recvmsg(), send(),
       sendto(), setsockopt(), socket(), write()

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

COPYRIGHT
       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                          SHUTDOWN(3)
