sunrpc/svc_run.c

   1 /*
   2  * Redistribution and use in source and binary forms, with or without
   3  * modification, are permitted provided that the following conditions are
   4  * met:
   5  *
   6  *     * Redistributions of source code must retain the above copyright
   7  *       notice, this list of conditions and the following disclaimer.
   8  *     * Redistributions in binary form must reproduce the above
   9  *       copyright notice, this list of conditions and the following
  10  *       disclaimer in the documentation and/or other materials
  11  *       provided with the distribution.
  12  *     * Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *       contributors may be used to endorse or promote products derived
  14  *       from this software without specific prior written permission.
  15  *
  16  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  19  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  20  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  21  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * This is the rpc server side idle loop
  30  * Wait for input, call server program.
  31  */
  32
  33 #include <errno.h>
  34 #include <unistd.h>
  35 #include <libintl.h>
  36 #include <sys/poll.h>
  37 #include <rpc/rpc.h>
  38
  39 /* This function can be used as a signal handler to terminate the
  40    server loop.  */
  41 void
  42 svc_exit (void)
  43 {
  44   free (svc_pollfd);
  45   svc_pollfd = NULL;
  46   svc_max_pollfd = 0;
  47 }
  48
  49 void
  50 svc_run (void)
  51 {
  52   int i;
  53   struct pollfd *my_pollfd = NULL;
  54   int last_max_pollfd = 0;
  55
  56   for (;;)
  57     {
  58       int max_pollfd = svc_max_pollfd;
  59       if (max_pollfd == 0 && svc_pollfd == NULL)
  60         break;
  61
  62       if (last_max_pollfd != max_pollfd)
  63         {
  64           struct pollfd *new_pollfd
  65             = realloc (my_pollfd, sizeof (struct pollfd) * max_pollfd);
  66
  67           if (new_pollfd == NULL)
  68             {
  69               perror (_("svc_run: - out of memory"));
  70               break;
  71             }
  72
  73           my_pollfd = new_pollfd;
  74           last_max_pollfd = max_pollfd;
  75         }
  76
  77       for (i = 0; i < max_pollfd; ++i)
  78         {
  79           my_pollfd[i].fd = svc_pollfd[i].fd;
  80           my_pollfd[i].events = svc_pollfd[i].events;
  81           my_pollfd[i].revents = 0;
  82         }
  83
  84       switch (i = __poll (my_pollfd, max_pollfd, -1))
  85         {
  86         case -1:
  87           if (errno == EINTR)
  88             continue;
  89           perror (_("svc_run: - poll failed"));
  90           break;
  91         case 0:
  92           continue;
  93         default:
  94           INTUSE(svc_getreq_poll) (my_pollfd, i);
  95           continue;
  96         }
  97       break;
  98     }
  99
 100   free (my_pollfd);
 101 }