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.
shutdown — shut down socket send and receive operations
int shutdown(int socket, int how);
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:
- Specifies the file descriptor of the socket.
- Specifies the type of shutdown. The values are as follows:
- Disables further receive operations.
- Disables further send operations.
- 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
Upon successful completion, shutdown() shall return 0; otherwise,
−1 shall be returned and errno set to indicate the error.
The shutdown() function shall fail if:
- The socket argument is not a valid file descriptor.
- The how argument is invalid.
- The socket is not connected.
- The socket argument does not refer to a socket.
The shutdown() function may fail if:
- Insufficient resources were available in the system to perform the
The following sections are informative.
getsockopt(), pselect(), read(),
recv(), recvfrom(), recvmsg(),
send(), sendto(), setsockopt(),
The Base Definitions volume of POSIX.1‐2008,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
7, Copyright (C) 2013 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013
Technical Corrigendum 1 applied.) 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.unix.org/online.html .
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