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# shutdown() - Unix, Linux System Call

# NAME

shutdown - shut down part of a full-duplex connection

# SYNOPSIS

#include <sys/socket.h>

int shutdown(int s, int how);

# DESCRIPTION

The shutdown() call causes all or part of a full-duplex connection on the socket associated with s to be shut down. If how is SHUT_RD, further receptions will be disallowed. If how is SHUT_WR, further transmissions will be disallowed. If how is SHUT_RDWR, further receptions and transmissions will be disallowed.

# RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

# ERRORS

Tag | Description
--- | ---
EBADF | s is not a valid descriptor.
ENOTCONN
| The specified socket is not connected.
ENOTSOCK
| s is a file, not a socket.

# NOTES

The constants SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, respectively, and are defined in <sys/socket.h> since glibc-2.1.91.

# CONFORMING TO

POSIX.1-2001, 4.4BSD (the shutdown() function call first appeared in 4.2BSD).

# SEE ALSO

- connect (2)

- socket (2)

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