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RedHat 9 (Linux i386) - man page for shutdown (redhat section 2)

SHUTDOWN(2)						     Linux Programmer's Manual						       SHUTDOWN(2)

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, fur- ther 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
EBADF s is not a valid descriptor. ENOTSOCK s is a file, not a socket. ENOTCONN The specified socket is not connected.
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
4.4BSD (the shutdown function call first appeared in 4.2BSD).
SEE ALSO
connect(2), socket(2) BSD Man Page 1993-07-24 SHUTDOWN(2)