kern_subr.c revision 1.9
1 /* 2 * Copyright (c) 1982, 1986, 1991 Regents of the University of California. 3 * All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)kern_subr.c 7.7 (Berkeley) 4/15/91 39 * $Id: kern_subr.c,v 1.9 1994/05/17 04:22:00 cgd Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 46 int 47 uiomove(cp, n, uio) 48 register caddr_t cp; 49 register int n; 50 register struct uio *uio; 51 { 52 register struct iovec *iov; 53 u_int cnt; 54 int error = 0; 55 56 57 #ifdef DIAGNOSTIC 58 if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) 59 panic("uiomove: mode"); 60 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 61 panic("uiomove proc"); 62 #endif 63 while (n > 0 && uio->uio_resid) { 64 iov = uio->uio_iov; 65 cnt = iov->iov_len; 66 if (cnt == 0) { 67 uio->uio_iov++; 68 uio->uio_iovcnt--; 69 continue; 70 } 71 if (cnt > n) 72 cnt = n; 73 switch (uio->uio_segflg) { 74 75 case UIO_USERSPACE: 76 case UIO_USERISPACE: 77 if (uio->uio_rw == UIO_READ) 78 error = copyout(cp, iov->iov_base, cnt); 79 else 80 error = copyin(iov->iov_base, cp, cnt); 81 if (error) 82 return (error); 83 break; 84 85 case UIO_SYSSPACE: 86 if (uio->uio_rw == UIO_READ) 87 bcopy((caddr_t)cp, iov->iov_base, cnt); 88 else 89 bcopy(iov->iov_base, (caddr_t)cp, cnt); 90 break; 91 } 92 iov->iov_base += cnt; 93 iov->iov_len -= cnt; 94 uio->uio_resid -= cnt; 95 uio->uio_offset += cnt; 96 cp += cnt; 97 n -= cnt; 98 } 99 return (error); 100 } 101 102 int 103 uioapply(func, arg1, arg2, uio) 104 int (*func)(); 105 int arg1, arg2; 106 register struct uio *uio; 107 { 108 register struct iovec *iov; 109 u_int cnt, cnt1; 110 int error = 0; 111 112 113 /*#ifdef DIAGNOSTIC*/ 114 if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) 115 panic("uioapply: mode"); 116 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 117 panic("uioapply proc"); 118 /*#endif*/ 119 while (uio->uio_resid) { 120 iov = uio->uio_iov; 121 cnt = iov->iov_len; 122 if (cnt == 0) { 123 uio->uio_iov++; 124 uio->uio_iovcnt--; 125 continue; 126 } 127 cnt1 = cnt; 128 error = (*func)(arg1, arg2, uio->uio_offset, uio->uio_rw, 129 iov->iov_base, &cnt1, uio->uio_procp); 130 cnt -= cnt1; 131 iov->iov_base += cnt; 132 iov->iov_len -= cnt; 133 uio->uio_resid -= cnt; 134 uio->uio_offset += cnt; 135 if (error || cnt1) 136 return (error); 137 } 138 return (0); 139 } 140 141 /* 142 * Give next character to user as result of read. 143 */ 144 int 145 ureadc(c, uio) 146 register int c; 147 register struct uio *uio; 148 { 149 register struct iovec *iov; 150 151 if (uio->uio_resid <= 0) 152 panic("ureadc: uio_resid == 0"); 153 154 again: 155 if (uio->uio_iovcnt == 0) 156 panic("ureadc: uio_iovcnt == 0"); 157 158 iov = uio->uio_iov; 159 if (iov->iov_len <= 0) { 160 uio->uio_iovcnt--; 161 uio->uio_iov++; 162 goto again; 163 } 164 switch (uio->uio_segflg) { 165 166 case UIO_USERSPACE: 167 if (subyte(iov->iov_base, c) < 0) 168 return (EFAULT); 169 break; 170 171 case UIO_SYSSPACE: 172 *iov->iov_base = c; 173 break; 174 175 case UIO_USERISPACE: 176 if (suibyte(iov->iov_base, c) < 0) 177 return (EFAULT); 178 break; 179 } 180 iov->iov_base++; 181 iov->iov_len--; 182 uio->uio_resid--; 183 uio->uio_offset++; 184 return (0); 185 } 186 187 #ifndef lint /* unused except by ct.c, other oddities XXX */ 188 /* 189 * Get next character written in by user from uio. 190 */ 191 int 192 uwritec(uio) 193 struct uio *uio; 194 { 195 register struct iovec *iov; 196 register int c; 197 198 if (uio->uio_resid <= 0) 199 return (-1); 200 again: 201 if (uio->uio_iovcnt <= 0) 202 panic("uwritec"); 203 iov = uio->uio_iov; 204 if (iov->iov_len == 0) { 205 uio->uio_iov++; 206 if (--uio->uio_iovcnt == 0) 207 return (-1); 208 goto again; 209 } 210 switch (uio->uio_segflg) { 211 212 case UIO_USERSPACE: 213 c = fubyte(iov->iov_base); 214 break; 215 216 case UIO_SYSSPACE: 217 c = *(u_char *) iov->iov_base; 218 break; 219 220 case UIO_USERISPACE: 221 c = fuibyte(iov->iov_base); 222 break; 223 } 224 if (c < 0) 225 return (-1); 226 iov->iov_base++; 227 iov->iov_len--; 228 uio->uio_resid--; 229 uio->uio_offset++; 230 return (c); 231 } 232 #endif /* notdef */ 233
Indexes created Tue Sep 23 01:09:51 GMT 2025