FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/ibcs2_msg.c

     /*
      * 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.
     *
     * $FreeBSD: src/sys/i386/ibcs2/ibcs2_msg.c,v 1.1.4.1 1999/09/05 08:11:27 peter Exp $
     */
    
    /*
     * IBCS2 message compatibility module.
     *
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/kernel.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, retval)
            struct proc *p;
            struct ibcs2_getmsg_args *uap;
            int *retval;
    {
            return 0; /* fake */
    }
    
    int
    ibcs2_putmsg(p, uap, retval)
            struct proc *p;
            struct ibcs2_putmsg_args *uap;
            int *retval;
    {
            return 0; /* fake */
    }
    
    
    int
    ibcs2_poll(p, uap, retval)
            struct proc *p;
            struct ibcs2_poll_args *uap;
            int *retval;
    {
            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)))
                           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, retval))
                   return error;
           if (*retval == 0)
                   return 0;
           *retval = 0;
           for (*retval = 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)
                                   ++*retval;
                   }
                   if (error = copyout(&conv,
                                       uap->fds + i*sizeof(struct ibcs2_poll),
                                       sizeof(conv)))
                           return error;
           }
           return 0;
   }

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