Line data    Source code

       1             : /*      $OpenBSD: subr_evcount.c,v 1.12 2015/03/14 03:38:50 jsg Exp $ */
       2             : /*
       3             :  * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
       4             :  * Copyright (c) 2004 Aaron Campbell <aaron@openbsd.org>
       5             :  * All rights reserved.
       6             :  *
       7             :  * Redistribution and use in source and binary forms, with or without
       8             :  * modification, are permitted provided that the following conditions
       9             :  * are met:
      10             :  *
      11             :  * 1. Redistributions of source code must retain the above copyright
      12             :  *    notice, this list of conditions and the following disclaimer.
      13             :  * 2. The name of the author may not be used to endorse or promote products
      14             :  *    derived from this software without specific prior written permission.
      15             :  *
      16             :  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
      17             :  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
      18             :  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
      19             :  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      20             :  * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      21             :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
      22             :  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
      23             :  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
      24             :  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
      25             :  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      26             :  */
      27             : 
      28             : #include <sys/param.h>
      29             : #include <sys/evcount.h>
      30             : #include <sys/timeout.h>
      31             : #include <sys/systm.h>
      32             : #include <sys/sysctl.h>
      33             : 
      34             : static TAILQ_HEAD(,evcount) evcount_list = TAILQ_HEAD_INITIALIZER(evcount_list);
      35             : 
      36             : void
      37           0 : evcount_attach(struct evcount *ec, const char *name, void *data)
      38             : {
      39             :         static int nextid = 0;
      40             : 
      41           0 :         memset(ec, 0, sizeof(*ec));
      42           0 :         ec->ec_name = name;
      43           0 :         ec->ec_id = ++nextid;
      44           0 :         ec->ec_data = data;
      45           0 :         TAILQ_INSERT_TAIL(&evcount_list, ec, next);
      46           0 : }
      47             : 
      48             : void
      49           0 : evcount_detach(struct evcount *ec)
      50             : {
      51           0 :         TAILQ_REMOVE(&evcount_list, ec, next);
      52           0 : }
      53             : 
      54             : #ifndef SMALL_KERNEL
      55             : 
      56             : int
      57           0 : evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
      58             :     void *newp, size_t newlen)
      59             : {
      60             :         int error = 0, s, nintr, i;
      61             :         struct evcount *ec;
      62             :         u_int64_t count;
      63             : 
      64           0 :         if (newp != NULL)
      65           0 :                 return (EPERM);
      66             : 
      67           0 :         if (name[0] != KERN_INTRCNT_NUM) {
      68           0 :                 if (namelen != 2)
      69           0 :                         return (ENOTDIR);
      70           0 :                 if (name[1] < 0)
      71           0 :                         return (EINVAL);
      72             :                 i = name[1];
      73           0 :         } else
      74             :                 i = -1;
      75             : 
      76             :         nintr = 0;
      77           0 :         TAILQ_FOREACH(ec, &evcount_list, next) {
      78           0 :                 if (nintr++ == i)
      79             :                         break;
      80             :         }
      81             : 
      82           0 :         switch (name[0]) {
      83             :         case KERN_INTRCNT_NUM:
      84           0 :                 error = sysctl_rdint(oldp, oldlenp, NULL, nintr);
      85           0 :                 break;
      86             :         case KERN_INTRCNT_CNT:
      87           0 :                 if (ec == NULL)
      88           0 :                         return (ENOENT);
      89           0 :                 s = splhigh();
      90           0 :                 count = ec->ec_count;
      91           0 :                 splx(s);
      92           0 :                 error = sysctl_rdquad(oldp, oldlenp, NULL, count);
      93           0 :                 break;
      94             :         case KERN_INTRCNT_NAME:
      95           0 :                 if (ec == NULL)
      96           0 :                         return (ENOENT);
      97           0 :                 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name);
      98           0 :                 break;
      99             :         case KERN_INTRCNT_VECTOR:
     100           0 :                 if (ec == NULL || ec->ec_data == NULL)
     101           0 :                         return (ENOENT);
     102           0 :                 error = sysctl_rdint(oldp, oldlenp, NULL,
     103           0 :                     *((int *)ec->ec_data));
     104           0 :                 break;
     105             :         default:
     106             :                 error = EOPNOTSUPP;
     107           0 :                 break;
     108             :         }
     109             : 
     110           0 :         return (error);
     111           0 : }
     112             : #endif  /* SMALL_KERNEL */