lib/libc/rpc/svc_run.c

   1 /*      $NetBSD: svc_run.c,v 1.22 2013/03/11 20:19:29 tron Exp $        */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 #if 0
  37 static char *sccsid = "@(#)svc_run.c 1.1 87/10/13 Copyr 1984 Sun Micro";
  38 static char *sccsid = "@(#)svc_run.c    2.1 88/07/29 4.0 RPCSRC";
  39 #else
  40 __RCSID("$NetBSD: svc_run.c,v 1.22 2013/03/11 20:19:29 tron Exp $");
  41 #endif
  42 #endif
  43
  44 /*
  45  * This is the rpc server side idle loop
  46  * Wait for input, call server program.
  47  */
  48 #include "namespace.h"
  49 #include "reentrant.h"
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <stdio.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 #include <rpc/rpc.h>
  57
  58 #include "svc_fdset.h"
  59 #include "rpc_internal.h"
  60
  61 #ifdef __weak_alias
  62 __weak_alias(svc_run,_svc_run)
  63 __weak_alias(svc_exit,_svc_exit)
  64 #endif
  65
  66 void
  67 svc_run(void)
  68 {
  69         fd_set readfds, cleanfds;
  70         struct timeval timeout;
  71         int maxfd;
  72 #ifndef RUMP_RPC
  73         int probs = 0;
  74 #endif
  75 #ifdef _REENTRANT
  76         extern rwlock_t svc_fd_lock;
  77 #endif
  78
  79         timeout.tv_sec = 30;
  80         timeout.tv_usec = 0;
  81
  82         for (;;) {
  83                 rwlock_rdlock(&svc_fd_lock);
  84                 readfds = *get_fdset();
  85                 cleanfds = *get_fdset();
  86                 maxfd = *get_fdsetmax();
  87                 rwlock_unlock(&svc_fd_lock);
  88                 switch (select(maxfd + 1, &readfds, NULL, NULL, &timeout)) {
  89                 case -1:
  90 #ifndef RUMP_RPC
  91                         if ((errno == EINTR || errno == EBADF) && probs < 100) {
  92                                 probs++;
  93                                 continue;
  94                         }
  95 #endif
  96                         if (errno == EINTR) {
  97                                 continue;
  98                         }
  99                         warn("%s: select failed", __func__);
 100                         return;
 101                 case 0:
 102                         __svc_clean_idle(&cleanfds, 30, FALSE);
 103                         continue;
 104                 default:
 105                         svc_getreqset(&readfds);
 106 #ifndef RUMP_RPC
 107                         probs = 0;
 108 #endif
 109                 }
 110         }
 111 }
 112
 113 /*
 114  *      This function causes svc_run() to exit by telling it that it has no
 115  *      more work to do.
 116  */
 117 void
 118 svc_exit(void)
 119 {
 120 #ifdef _REENTRANT
 121         extern rwlock_t svc_fd_lock;
 122 #endif
 123
 124         rwlock_wrlock(&svc_fd_lock);
 125         FD_ZERO(get_fdset());
 126         rwlock_unlock(&svc_fd_lock);
 127 }