freebsd-dev/sys/i386/ibcs2/ibcs2_msg.c

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/*
* Copyright (c) 1995 Steven Wallace
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
1999-08-28 01:08:13 +00:00
* $FreeBSD$
*/
/*
* IBCS2 message compatibility module.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <i386/ibcs2/ibcs2_types.h>
#include <i386/ibcs2/ibcs2_signal.h>
#include <i386/ibcs2/ibcs2_util.h>
#include <i386/ibcs2/ibcs2_poll.h>
#include <i386/ibcs2/ibcs2_proto.h>
int
ibcs2_getmsg(p, uap)
struct proc *p;
struct ibcs2_getmsg_args *uap;
{
return 0; /* fake */
}
int
ibcs2_putmsg(p, uap)
struct proc *p;
struct ibcs2_putmsg_args *uap;
{
return 0; /* fake */
}
int
ibcs2_poll(p, uap)
struct proc *p;
struct ibcs2_poll_args *uap;
{
int error, i;
fd_set *readfds, *writefds, *exceptfds;
struct timeval *timeout;
struct ibcs2_poll conv;
struct select_args tmp_select;
caddr_t sg = stackgap_init();
if (uap->nfds > FD_SETSIZE)
return EINVAL;
readfds = stackgap_alloc(&sg, sizeof(fd_set *));
writefds = stackgap_alloc(&sg, sizeof(fd_set *));
exceptfds = stackgap_alloc(&sg, sizeof(fd_set *));
timeout = stackgap_alloc(&sg, sizeof(struct timeval *));
FD_ZERO(readfds);
FD_ZERO(writefds);
FD_ZERO(exceptfds);
if (uap->timeout == -1)
timeout = NULL;
else {
timeout->tv_usec = (uap->timeout % 1000)*1000;
timeout->tv_sec = uap->timeout / 1000;
}
tmp_select.nd = 0;
tmp_select.in = readfds;
tmp_select.ou = writefds;
tmp_select.ex = exceptfds;
tmp_select.tv = timeout;
for (i = 0; i < uap->nfds; i++) {
if ((error = copyin(uap->fds + i*sizeof(struct ibcs2_poll),
&conv, sizeof(conv))) != 0)
return error;
conv.revents = 0;
if (conv.fd < 0 || conv.fd > FD_SETSIZE)
continue;
if (conv.fd >= tmp_select.nd)
tmp_select.nd = conv.fd + 1;
if (conv.events & IBCS2_READPOLL)
FD_SET(conv.fd, readfds);
if (conv.events & IBCS2_WRITEPOLL)
FD_SET(conv.fd, writefds);
FD_SET(conv.fd, exceptfds);
}
if ((error = select(p, &tmp_select)) != 0)
return error;
if (p->p_retval[0] == 0)
return 0;
p->p_retval[0] = 0;
for (p->p_retval[0] = 0, i = 0; i < uap->nfds; i++) {
copyin(uap->fds + i*sizeof(struct ibcs2_poll),
&conv, sizeof(conv));
conv.revents = 0;
if (conv.fd < 0 || conv.fd > FD_SETSIZE)
/* should check for open as well */
conv.revents |= IBCS2_POLLNVAL;
else {
if (FD_ISSET(conv.fd, readfds))
conv.revents |= IBCS2_POLLIN;
if (FD_ISSET(conv.fd, writefds))
conv.revents |= IBCS2_POLLOUT;
if (FD_ISSET(conv.fd, exceptfds))
conv.revents |= IBCS2_POLLERR;
if (conv.revents)
++p->p_retval[0];
}
if ((error = copyout(&conv,
uap->fds + i*sizeof(struct ibcs2_poll),
sizeof(conv))) != 0)
return error;
}
return 0;
}