The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1995 Steven Wallace
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. The name of the author may not be used to endorse or promote products
   11  *    derived from this software without specific prior written permission
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  */
   24 
   25 #include <sys/cdefs.h>
   26 __FBSDID("$FreeBSD: releng/5.3/sys/i386/ibcs2/ibcs2_msg.c 115684 2003-06-02 06:48:51Z obrien $");
   27 
   28 /*
   29  * IBCS2 message compatibility module.
   30  *
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/sysproto.h>
   36 
   37 #include <i386/ibcs2/ibcs2_types.h>
   38 #include <i386/ibcs2/ibcs2_signal.h>
   39 #include <i386/ibcs2/ibcs2_util.h>
   40 #include <i386/ibcs2/ibcs2_poll.h>
   41 #include <i386/ibcs2/ibcs2_proto.h>
   42 
   43 
   44 int
   45 ibcs2_getmsg(td, uap)
   46         struct thread *td;
   47         struct ibcs2_getmsg_args *uap;
   48 {
   49         return 0; /* fake */
   50 }
   51 
   52 int
   53 ibcs2_putmsg(td, uap)
   54         struct thread *td;
   55         struct ibcs2_putmsg_args *uap;
   56 {
   57         return 0; /* fake */
   58 }
   59 
   60 
   61 int
   62 ibcs2_poll(td, uap)
   63         struct thread *td;
   64         struct ibcs2_poll_args *uap;
   65 {
   66         int error, i;
   67         fd_set *readfds, *writefds, *exceptfds;
   68         struct timeval *timeout;
   69         struct ibcs2_poll conv;
   70         struct select_args tmp_select;
   71         caddr_t sg = stackgap_init();
   72 
   73         if (uap->nfds > FD_SETSIZE)
   74                 return EINVAL;
   75         readfds   = stackgap_alloc(&sg, sizeof(fd_set *));
   76         writefds  = stackgap_alloc(&sg, sizeof(fd_set *));
   77         exceptfds = stackgap_alloc(&sg, sizeof(fd_set *));
   78         timeout   = stackgap_alloc(&sg, sizeof(struct timeval *));
   79 
   80         FD_ZERO(readfds);
   81         FD_ZERO(writefds);
   82         FD_ZERO(exceptfds);
   83         if (uap->timeout == -1)
   84                 timeout = NULL;
   85         else {
   86                 timeout->tv_usec = (uap->timeout % 1000)*1000;
   87                 timeout->tv_sec  = uap->timeout / 1000;
   88         }
   89 
   90         tmp_select.nd = 0;
   91         tmp_select.in = readfds;
   92         tmp_select.ou = writefds;
   93         tmp_select.ex = exceptfds;
   94         tmp_select.tv = timeout;
   95 
   96         for (i = 0; i < uap->nfds; i++) {
   97                 if ((error = copyin(uap->fds + i*sizeof(struct ibcs2_poll),
   98                                    &conv, sizeof(conv))) != 0)
   99                         return error;
  100                 conv.revents = 0;
  101                 if (conv.fd < 0 || conv.fd > FD_SETSIZE)
  102                         continue;
  103                 if (conv.fd >= tmp_select.nd)
  104                         tmp_select.nd = conv.fd + 1;
  105                 if (conv.events & IBCS2_READPOLL)
  106                         FD_SET(conv.fd, readfds);
  107                 if (conv.events & IBCS2_WRITEPOLL)
  108                         FD_SET(conv.fd, writefds);
  109                 FD_SET(conv.fd, exceptfds);
  110         }
  111         if ((error = select(td, &tmp_select)) != 0)
  112                 return error;
  113         if (td->td_retval[0] == 0)
  114                 return 0;
  115         td->td_retval[0] = 0;
  116         for (td->td_retval[0] = 0, i = 0; i < uap->nfds; i++) {
  117                 copyin(uap->fds + i*sizeof(struct ibcs2_poll),
  118                        &conv, sizeof(conv));
  119                 conv.revents = 0;
  120                 if (conv.fd < 0 || conv.fd > FD_SETSIZE)
  121                         /* should check for open as well */
  122                         conv.revents |= IBCS2_POLLNVAL;
  123                 else {
  124                         if (FD_ISSET(conv.fd, readfds))
  125                                 conv.revents |= IBCS2_POLLIN;
  126                         if (FD_ISSET(conv.fd, writefds))
  127                                 conv.revents |= IBCS2_POLLOUT;
  128                         if (FD_ISSET(conv.fd, exceptfds))
  129                                 conv.revents |= IBCS2_POLLERR;
  130                         if (conv.revents)
  131                                 ++td->td_retval[0];
  132                 }
  133                 if ((error = copyout(&conv,
  134                                     uap->fds + i*sizeof(struct ibcs2_poll),
  135                                     sizeof(conv))) != 0)
  136                         return error;
  137         }
  138         return 0;
  139 }

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