1 /* $OpenBSD: subr_evcount.c,v 1.13 2022/08/14 01:58:28 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/systm.h> 31 #include <sys/sysctl.h> 32 33 static TAILQ_HEAD(,evcount) evcount_list = TAILQ_HEAD_INITIALIZER(evcount_list); 34 35 void 36 evcount_attach(struct evcount *ec, const char *name, void *data) 37 { 38 static int nextid = 0; 39 40 memset(ec, 0, sizeof(*ec)); 41 ec->ec_name = name; 42 ec->ec_id = ++nextid; 43 ec->ec_data = data; 44 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 45 } 46 47 void 48 evcount_detach(struct evcount *ec) 49 { 50 TAILQ_REMOVE(&evcount_list, ec, next); 51 } 52 53 #ifndef SMALL_KERNEL 54 55 int 56 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 57 void *newp, size_t newlen) 58 { 59 int error = 0, s, nintr, i; 60 struct evcount *ec; 61 u_int64_t count; 62 63 if (newp != NULL) 64 return (EPERM); 65 66 if (name[0] != KERN_INTRCNT_NUM) { 67 if (namelen != 2) 68 return (ENOTDIR); 69 if (name[1] < 0) 70 return (EINVAL); 71 i = name[1]; 72 } else 73 i = -1; 74 75 nintr = 0; 76 TAILQ_FOREACH(ec, &evcount_list, next) { 77 if (nintr++ == i) 78 break; 79 } 80 81 switch (name[0]) { 82 case KERN_INTRCNT_NUM: 83 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 84 break; 85 case KERN_INTRCNT_CNT: 86 if (ec == NULL) 87 return (ENOENT); 88 s = splhigh(); 89 count = ec->ec_count; 90 splx(s); 91 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 92 break; 93 case KERN_INTRCNT_NAME: 94 if (ec == NULL) 95 return (ENOENT); 96 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 97 break; 98 case KERN_INTRCNT_VECTOR: 99 if (ec == NULL || ec->ec_data == NULL) 100 return (ENOENT); 101 error = sysctl_rdint(oldp, oldlenp, NULL, 102 *((int *)ec->ec_data)); 103 break; 104 default: 105 error = EOPNOTSUPP; 106 break; 107 } 108 109 return (error); 110 } 111 #endif /* SMALL_KERNEL */ 112