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.
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .