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Usenet 1994 October
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volume26
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mcast
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part01
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libmcast
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mc_shutdown.c
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1993-04-06
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/*
* $Header: /u0/casey/src/mcast/libmcast/RCS/mc_shutdown.c,v 1.1 92/10/16 18:22:51 casey Exp $
*/
/*
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Livermore National Laboratory and its
* contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char rcsid[] = "$Header: /u0/casey/src/mcast/libmcast/RCS/mc_shutdown.c,v 1.1 92/10/16 18:22:51 casey Exp $";
static char copyright[] =
"Copyright (c) 1992 The Regents of the University of California.\n"
"All rights reserved.\n";
static char classification[] =
"Unclassified\n";
#endif
/*
* MCAST SYSLIB PUBLIC: mc_shutdown: shutdown(2) system call emulation routine.
*/
#include "mc_lib.h"
int
mc_shutdown(int s, int how)
{
mc_state *sp = &_mc_state[s];
int mask;
if (s < 0 || s >= MC_MAX_CONNECTIONS
|| !(sp->state & MC_VALID)) {
/* return(close(s)); */
errno = EBADF;
return(-1);
}
if (how == 0)
mask = MC_SHUTDOWNRECV;
else if (how == 1)
mask = MC_SHUTDOWNSEND;
else if (how == 2)
mask = MC_SHUTDOWNRECV|MC_SHUTDOWNSEND;
else {
errno = EINVAL;
return(-1);
}
/* if SHUTDOWNRECV requested and we aren't already in that state ... */
if ((mask & ~sp->state) & MC_SHUTDOWNRECV) {
mcd_message command;
(void)memset(&command, 0, sizeof(command));
command.request = htonl(MCD_SHUTDOWNRECV);
command.option = htonl(1);
if (_mc_write(s, &command, sizeof(command), 0, &MCD_MCADDR) < 0)
return(-1);
}
sp->state |= mask;
return(0);
}