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 evcount_attach(struct evcount *ec, const char *name, void *data) 38 { 39 static int nextid = 0; 40 41 memset(ec, 0, sizeof(*ec)); 42 ec->ec_name = name; 43 ec->ec_id = ++nextid; 44 ec->ec_data = data; 45 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 46 } 47 48 void 49 evcount_detach(struct evcount *ec) 50 { 51 TAILQ_REMOVE(&evcount_list, ec, next); 52 } 53 54 #ifndef SMALL_KERNEL 55 56 int 57 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 if (newp != NULL) 65 return (EPERM); 66 67 if (name[0] != KERN_INTRCNT_NUM) { 68 if (namelen != 2) 69 return (ENOTDIR); 70 if (name[1] < 0) 71 return (EINVAL); 72 i = name[1]; 73 } else 74 i = -1; 75 76 nintr = 0; 77 TAILQ_FOREACH(ec, &evcount_list, next) { 78 if (nintr++ == i) 79 break; 80 } 81 82 switch (name[0]) { 83 case KERN_INTRCNT_NUM: 84 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 85 break; 86 case KERN_INTRCNT_CNT: 87 if (ec == NULL) 88 return (ENOENT); 89 s = splhigh(); 90 count = ec->ec_count; 91 splx(s); 92 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 93 break; 94 case KERN_INTRCNT_NAME: 95 if (ec == NULL) 96 return (ENOENT); 97 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 98 break; 99 case KERN_INTRCNT_VECTOR: 100 if (ec == NULL || ec->ec_data == NULL) 101 return (ENOENT); 102 error = sysctl_rdint(oldp, oldlenp, NULL, 103 *((int *)ec->ec_data)); 104 break; 105 default: 106 error = EOPNOTSUPP; 107 break; 108 } 109 110 return (error); 111 } 112 #endif /* SMALL_KERNEL */ 113