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Annotation of kernel/bsd/kern/kern_subr.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1991, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  * (c) UNIX System Laboratories, Inc.
        !            30:  * All or some portions of this file are derived from material licensed
        !            31:  * to the University of California by American Telephone and Telegraph
        !            32:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            33:  * the permission of UNIX System Laboratories, Inc.
        !            34:  *
        !            35:  * Redistribution and use in source and binary forms, with or without
        !            36:  * modification, are permitted provided that the following conditions
        !            37:  * are met:
        !            38:  * 1. Redistributions of source code must retain the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer.
        !            40:  * 2. Redistributions in binary form must reproduce the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer in the
        !            42:  *    documentation and/or other materials provided with the distribution.
        !            43:  * 3. All advertising materials mentioning features or use of this software
        !            44:  *    must display the following acknowledgement:
        !            45:  *     This product includes software developed by the University of
        !            46:  *     California, Berkeley and its contributors.
        !            47:  * 4. Neither the name of the University nor the names of its contributors
        !            48:  *    may be used to endorse or promote products derived from this software
        !            49:  *    without specific prior written permission.
        !            50:  *
        !            51:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            52:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            53:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            54:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            55:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            56:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            57:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            58:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            59:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            60:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            61:  * SUCH DAMAGE.
        !            62:  *
        !            63:  *     @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
        !            64:  */
        !            65: 
        !            66: #include <sys/param.h>
        !            67: #include <sys/systm.h>
        !            68: #include <sys/proc.h>
        !            69: #include <sys/malloc.h>
        !            70: #include <sys/queue.h>
        !            71: 
        !            72: int
        !            73: uiomove(cp, n, uio)
        !            74:        register caddr_t cp;
        !            75:        register int n;
        !            76:        register struct uio *uio;
        !            77: {
        !            78:        register struct iovec *iov;
        !            79:        u_int cnt;
        !            80:        int error = 0;
        !            81: 
        !            82: #if DIAGNOSTIC
        !            83:        if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
        !            84:                panic("uiomove: mode");
        !            85:        if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != current_proc())
        !            86:                panic("uiomove proc");
        !            87: #endif
        !            88: 
        !            89:        while (n > 0 && uio->uio_resid) {
        !            90:                iov = uio->uio_iov;
        !            91:                cnt = iov->iov_len;
        !            92:                if (cnt == 0) {
        !            93:                        uio->uio_iov++;
        !            94:                        uio->uio_iovcnt--;
        !            95:                        continue;
        !            96:                }
        !            97:                if (cnt > n)
        !            98:                        cnt = n;
        !            99:                switch (uio->uio_segflg) {
        !           100: 
        !           101:                case UIO_USERSPACE:
        !           102:                case UIO_USERISPACE:
        !           103:                        if (uio->uio_rw == UIO_READ)
        !           104:                                error = copyout(cp, iov->iov_base, cnt);
        !           105:                        else
        !           106:                                error = copyin(iov->iov_base, cp, cnt);
        !           107:                        if (error)
        !           108:                                return (error);
        !           109:                        break;
        !           110: 
        !           111:                case UIO_SYSSPACE:
        !           112:                        if (uio->uio_rw == UIO_READ)
        !           113:                                error = copywithin((caddr_t)cp, iov->iov_base,
        !           114:                                                   cnt);
        !           115:                        else
        !           116:                                error = copywithin(iov->iov_base, (caddr_t)cp,
        !           117:                                                   cnt);
        !           118:                        break;
        !           119:                }
        !           120:                iov->iov_base += cnt;
        !           121:                iov->iov_len -= cnt;
        !           122:                uio->uio_resid -= cnt;
        !           123:                uio->uio_offset += cnt;
        !           124:                cp += cnt;
        !           125:                n -= cnt;
        !           126:        }
        !           127:        return (error);
        !           128: }
        !           129: 
        !           130: /*
        !           131:  * Give next character to user as result of read.
        !           132:  */
        !           133: int
        !           134: ureadc(c, uio)
        !           135:        register int c;
        !           136:        register struct uio *uio;
        !           137: {
        !           138:        register struct iovec *iov;
        !           139: 
        !           140:        if (uio->uio_resid <= 0)
        !           141:                panic("ureadc: non-positive resid");
        !           142: again:
        !           143:        if (uio->uio_iovcnt == 0)
        !           144:                panic("ureadc: non-positive iovcnt");
        !           145:        iov = uio->uio_iov;
        !           146:        if (iov->iov_len <= 0) {
        !           147:                uio->uio_iovcnt--;
        !           148:                uio->uio_iov++;
        !           149:                goto again;
        !           150:        }
        !           151:        switch (uio->uio_segflg) {
        !           152: 
        !           153:        case UIO_USERSPACE:
        !           154:                if (subyte(iov->iov_base, c) < 0)
        !           155:                        return (EFAULT);
        !           156:                break;
        !           157: 
        !           158:        case UIO_SYSSPACE:
        !           159:                *iov->iov_base = c;
        !           160:                break;
        !           161: 
        !           162:        case UIO_USERISPACE:
        !           163:                if (suibyte(iov->iov_base, c) < 0)
        !           164:                        return (EFAULT);
        !           165:                break;
        !           166:        }
        !           167:        iov->iov_base++;
        !           168:        iov->iov_len--;
        !           169:        uio->uio_resid--;
        !           170:        uio->uio_offset++;
        !           171:        return (0);
        !           172: }
        !           173: 
        !           174: #if defined(vax) || defined(ppc)
        !           175: /* unused except by ct.c, other oddities XXX */
        !           176: /*
        !           177:  * Get next character written in by user from uio.
        !           178:  */
        !           179: uwritec(uio)
        !           180:        struct uio *uio;
        !           181: {
        !           182:        register struct iovec *iov;
        !           183:        register int c;
        !           184: 
        !           185:        if (uio->uio_resid <= 0)
        !           186:                return (-1);
        !           187: again:
        !           188:        if (uio->uio_iovcnt <= 0)
        !           189:                panic("uwritec: non-positive iovcnt");
        !           190:        iov = uio->uio_iov;
        !           191:        if (iov->iov_len == 0) {
        !           192:                uio->uio_iov++;
        !           193:                if (--uio->uio_iovcnt == 0)
        !           194:                        return (-1);
        !           195:                goto again;
        !           196:        }
        !           197:        switch (uio->uio_segflg) {
        !           198: 
        !           199:        case UIO_USERSPACE:
        !           200:                c = fubyte(iov->iov_base);
        !           201:                break;
        !           202: 
        !           203:        case UIO_SYSSPACE:
        !           204:                c = *iov->iov_base & 0377;
        !           205:                break;
        !           206: 
        !           207:        case UIO_USERISPACE:
        !           208:                c = fuibyte(iov->iov_base);
        !           209:                break;
        !           210: 
        !           211:        default:
        !           212:                c = 0;  /* avoid uninitialized variable warning */
        !           213:                panic("uwritec: bogus uio_segflg");
        !           214:                break;
        !           215:        }
        !           216:        if (c < 0)
        !           217:                return (-1);
        !           218:        iov->iov_base++;
        !           219:        iov->iov_len--;
        !           220:        uio->uio_resid--;
        !           221:        uio->uio_offset++;
        !           222:        return (c);
        !           223: }
        !           224: #endif /* vax || ppc */
        !           225: 
        !           226: /*
        !           227:  * General routine to allocate a hash table.
        !           228:  */
        !           229: void *
        !           230: hashinit(elements, type, hashmask)
        !           231:        int elements, type;
        !           232:        u_long *hashmask;
        !           233: {
        !           234:        long hashsize;
        !           235:        LIST_HEAD(generic, generic) *hashtbl;
        !           236:        int i;
        !           237: 
        !           238:        if (elements <= 0)
        !           239:                panic("hashinit: bad cnt");
        !           240:        for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
        !           241:                continue;
        !           242:        hashsize >>= 1;
        !           243:        MALLOC(hashtbl, struct generic *, 
        !           244:                        (u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
        !           245:        bzero(hashtbl, (u_long)hashsize * sizeof(*hashtbl));
        !           246:        for (i = 0; i < hashsize; i++)
        !           247:                LIST_INIT(&hashtbl[i]);
        !           248:        *hashmask = hashsize - 1;
        !           249:        return (hashtbl);
        !           250: }

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