Return to subr_evcount.c CVS log

Up to [local] / sys / kern

Annotation of sys/kern/subr_evcount.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: subr_evcount.c,v 1.8 2006/10/17 10:29:50 grange 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/kernel.h>
        !            32: #include <sys/systm.h>
        !            33: #include <sys/sysctl.h>
        !            34:
        !            35: static TAILQ_HEAD(,evcount) evcount_list;
        !            36:
        !            37: /*
        !            38:  * Standard evcount parents.
        !            39:  */
        !            40: struct evcount evcount_intr;
        !            41:
        !            42: void evcount_init(void);
        !            43:
        !            44: void
        !            45: evcount_init(void)
        !            46: {
        !            47:        TAILQ_INIT(&evcount_list);
        !            48:
        !            49:        evcount_attach(&evcount_intr, "intr", NULL, NULL);
        !            50: }
        !            51:
        !            52:
        !            53: void
        !            54: evcount_attach(struct evcount *ec, const char *name, void *data,
        !            55:     struct evcount *parent)
        !            56: {
        !            57:        static int nextid = 0;
        !            58:
        !            59:        if (nextid == 0) {
        !            60:                nextid++;               /* start with 1 */
        !            61:                evcount_init();
        !            62:        }
        !            63:
        !            64:        memset(ec, 0, sizeof(*ec));
        !            65:        ec->ec_name = name;
        !            66:        ec->ec_parent = parent;
        !            67:        ec->ec_id = nextid++;
        !            68:        ec->ec_data = data;
        !            69:        TAILQ_INSERT_TAIL(&evcount_list, ec, next);
        !            70: }
        !            71:
        !            72: void
        !            73: evcount_detach(struct evcount *ec)
        !            74: {
        !            75:        TAILQ_REMOVE(&evcount_list, ec, next);
        !            76: }
        !            77:
        !            78: #ifndef        SMALL_KERNEL
        !            79:
        !            80: int
        !            81: evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
        !            82:     void *newp, size_t newlen)
        !            83: {
        !            84:        int error = 0, s, nintr, i;
        !            85:        struct evcount *ec;
        !            86:        u_int64_t count;
        !            87:
        !            88:        if (newp != NULL)
        !            89:                return (EPERM);
        !            90:
        !            91:        if (name[0] != KERN_INTRCNT_NUM) {
        !            92:                if (namelen != 2)
        !            93:                        return (ENOTDIR);
        !            94:                if (name[1] < 0)
        !            95:                        return (EINVAL);
        !            96:                i = name[1];
        !            97:        } else
        !            98:                i = -1;
        !            99:
        !           100:        nintr = 0;
        !           101:        TAILQ_FOREACH(ec, &evcount_list, next) {
        !           102:                if (ec->ec_parent != &evcount_intr)
        !           103:                        continue;
        !           104:                if (nintr++ == i)
        !           105:                        break;
        !           106:        }
        !           107:
        !           108:        switch (name[0]) {
        !           109:        case KERN_INTRCNT_NUM:
        !           110:                error = sysctl_rdint(oldp, oldlenp, NULL, nintr);
        !           111:                break;
        !           112:        case KERN_INTRCNT_CNT:
        !           113:                if (ec == NULL)
        !           114:                        return (ENOENT);
        !           115:                s = splhigh();
        !           116:                count = ec->ec_count;
        !           117:                splx(s);
        !           118:                error = sysctl_rdquad(oldp, oldlenp, NULL, count);
        !           119:                break;
        !           120:        case KERN_INTRCNT_NAME:
        !           121:                if (ec == NULL)
        !           122:                        return (ENOENT);
        !           123:                error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name);
        !           124:                break;
        !           125:        case KERN_INTRCNT_VECTOR:
        !           126:                if (ec == NULL || ec->ec_data == NULL)
        !           127:                        return (ENOENT);
        !           128:                error = sysctl_rdint(oldp, oldlenp, NULL,
        !           129:                    *((int *)ec->ec_data));
        !           130:                break;
        !           131:        default:
        !           132:                error = EOPNOTSUPP;
        !           133:                break;
        !           134:        }
        !           135:
        !           136:        return (error);
        !           137: }
        !           138: #endif /* SMALL_KERNEL */