release/src/router/nfs-utils/utils/mountd/svc_run.c

   1 /*
   2  * Copyright (C) 1984 Sun Microsystems, Inc.
   3  * Based on svc_run.c from statd which claimed:
   4  * Modified by Jeffrey A. Uphoff, 1995, 1997-1999.
   5  * Modified by Olaf Kirch, 1996.
   6  *
   7  */
   8
   9 /*
  10  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  11  * unrestricted use provided that this legend is included on all tape
  12  * media and as a part of the software program in whole or part.  Users
  13  * may copy or modify Sun RPC without charge, but are not authorized
  14  * to license or distribute it to anyone else except as part of a product or
  15  * program developed by the user.
  16  *
  17  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  18  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  20  *
  21  * Sun RPC is provided with no support and without any obligation on the
  22  * part of Sun Microsystems, Inc. to assist in its use, correction,
  23  * modification or enhancement.
  24  *
  25  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  26  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  27  * OR ANY PART THEREOF.
  28  *
  29  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  30  * or profits or other special, indirect and consequential damages, even if
  31  * Sun has been advised of the possibility of such damages.
  32  *
  33  * Sun Microsystems, Inc.
  34  * 2550 Garcia Avenue
  35  * Mountain View, California  94043
  36  */
  37
  38 /*
  39  * Allow svc_run to listen to other file descriptors as well
  40  */
  41
  42 /*
  43  * This is the RPC server side idle loop.
  44  * Wait for input, call server program.
  45  */
  46
  47 #ifdef HAVE_CONFIG_H
  48 #include <config.h>
  49 #endif
  50
  51 #include <sys/types.h>
  52 #include <rpc/rpc.h>
  53 #include "xlog.h"
  54 #include <errno.h>
  55 #include <time.h>
  56
  57 void cache_set_fds(fd_set *fdset);
  58 int cache_process_req(fd_set *readfds);
  59
  60 #if LONG_MAX != INT_MAX
  61 /* bug in glibc 2.3.6 and earlier, we need
  62  * our own svc_getreqset
  63  */
  64 static void
  65 my_svc_getreqset (fd_set *readfds)
  66 {
  67         fd_mask mask;
  68         fd_mask *maskp;
  69         int setsize;
  70         int sock;
  71         int bit;
  72
  73         setsize = _rpc_dtablesize ();
  74         if (setsize > FD_SETSIZE)
  75                 setsize = FD_SETSIZE;
  76         maskp = readfds->fds_bits;
  77         for (sock = 0; sock < setsize; sock += NFDBITS)
  78                 for (mask = *maskp++;
  79                      (bit = ffsl (mask));
  80                      mask ^= (1L << (bit - 1)))
  81                         svc_getreq_common (sock + bit - 1);
  82 }
  83 #define svc_getreqset my_svc_getreqset
  84
  85 #endif
  86
  87 /*
  88  * The heart of the server.  A crib from libc for the most part...
  89  */
  90 void
  91 my_svc_run(void)
  92 {
  93         fd_set  readfds;
  94         int     selret;
  95
  96         for (;;) {
  97
  98                 readfds = svc_fdset;
  99                 cache_set_fds(&readfds);
 100
 101                 selret = select(FD_SETSIZE, &readfds,
 102                                 (void *) 0, (void *) 0, (struct timeval *) 0);
 103
 104
 105                 switch (selret) {
 106                 case -1:
 107                         if (errno == EINTR || errno == ECONNREFUSED
 108                          || errno == ENETUNREACH || errno == EHOSTUNREACH)
 109                                 continue;
 110                         xlog(L_ERROR, "my_svc_run() - select: %m");
 111                         return;
 112
 113                 default:
 114                         selret -= cache_process_req(&readfds);
 115                         if (selret)
 116                                 svc_getreqset(&readfds);
 117                 }
 118         }
 119 }