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annotate packages/net/tcpip/current/src/sys/kern/kern_subr.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 0c135c6d644c
children
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1 //==========================================================================
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2 //
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3 // sys/kern/kern_subr.c
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4 //
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5 //
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6 //
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7 //==========================================================================
2729
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8 // ####BSDALTCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // Portions of this software may have been derived from OpenBSD
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11 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 // -------------------------------------------
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14 // ####BSDALTCOPYRIGHTEND####
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15 //==========================================================================
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16 //#####DESCRIPTIONBEGIN####
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17 //
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18 // Author(s): gthomas
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19 // Contributors: gthomas
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20 // Date: 2000-01-10
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21 // Purpose:
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22 // Description:
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23 //
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24 //
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25 //####DESCRIPTIONEND####
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26 //
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27 //==========================================================================
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28
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30 /* $OpenBSD: kern_subr.c,v 1.10 1999/11/07 17:39:14 provos Exp $ */
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31 /* $NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $ */
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32
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33 /*
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34 * Copyright (c) 1982, 1986, 1991, 1993
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35 * The Regents of the University of California. All rights reserved.
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36 * (c) UNIX System Laboratories, Inc.
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37 * All or some portions of this file are derived from material licensed
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38 * to the University of California by American Telephone and Telegraph
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39 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
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40 * the permission of UNIX System Laboratories, Inc.
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41 *
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42 * Redistribution and use in source and binary forms, with or without
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43 * modification, are permitted provided that the following conditions
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44 * are met:
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45 * 1. Redistributions of source code must retain the above copyright
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46 * notice, this list of conditions and the following disclaimer.
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47 * 2. Redistributions in binary form must reproduce the above copyright
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48 * notice, this list of conditions and the following disclaimer in the
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49 * documentation and/or other materials provided with the distribution.
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50 * 3. All advertising materials mentioning features or use of this software
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51 * must display the following acknowledgement:
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52 * This product includes software developed by the University of
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53 * California, Berkeley and its contributors.
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54 * 4. Neither the name of the University nor the names of its contributors
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55 * may be used to endorse or promote products derived from this software
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56 * without specific prior written permission.
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57 *
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58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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68 * SUCH DAMAGE.
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69 *
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70 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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71 */
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72
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73 #include <sys/param.h>
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74 #ifndef __ECOS
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75 #include <sys/systm.h>
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76 #include <sys/proc.h>
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77 #endif // __ECOS
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78 #include <sys/malloc.h>
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79 #include <sys/queue.h>
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80
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81 int
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82 uiomove(cp, n, uio)
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83 register caddr_t cp;
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84 register int n;
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85 register struct uio *uio;
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86 {
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87 register struct iovec *iov;
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88 u_int cnt;
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89 int error = 0;
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90
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91 #ifdef DIAGNOSTIC
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92 if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
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93 panic("uiomove: mode");
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94 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
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95 panic("uiomove proc");
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96 #endif
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97 while (n > 0 && uio->uio_resid) {
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98 iov = uio->uio_iov;
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99 cnt = iov->iov_len;
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100 if (cnt == 0) {
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101 uio->uio_iov++;
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102 uio->uio_iovcnt--;
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103 continue;
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104 }
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105 if (cnt > n)
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106 cnt = n;
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107 switch (uio->uio_segflg) {
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108
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109 case UIO_USERSPACE:
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110 if (uio->uio_rw == UIO_READ)
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111 error = copyout(cp, iov->iov_base, cnt);
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112 else
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113 error = copyin(iov->iov_base, cp, cnt);
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114 if (error)
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115 return (error);
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116 break;
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117
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118 case UIO_SYSSPACE:
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119 #if defined(UVM)
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120 if (uio->uio_rw == UIO_READ)
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121 error = kcopy(cp, iov->iov_base, cnt);
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122 else
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123 error = kcopy(iov->iov_base, cp, cnt);
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124 if (error)
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125 return(error);
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126 #else
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127 if (uio->uio_rw == UIO_READ)
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128 bcopy((caddr_t)cp, iov->iov_base, cnt);
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129 else
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130 bcopy(iov->iov_base, (caddr_t)cp, cnt);
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131 break;
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132 #endif
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133 }
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134 iov->iov_base = (char *)iov->iov_base + cnt;
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135 iov->iov_len -= cnt;
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136 uio->uio_resid -= cnt;
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137 uio->uio_offset += cnt;
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138 cp += cnt;
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139 n -= cnt;
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140 }
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141 return (error);
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142 }
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143
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144 #ifndef __ECOS
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145 /*
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146 * Give next character to user as result of read.
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147 */
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148 int
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149 ureadc(c, uio)
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150 register int c;
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151 register struct uio *uio;
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152 {
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153 register struct iovec *iov;
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154
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155 if (uio->uio_resid == 0)
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156 #ifdef DIAGNOSTIC
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157 panic("ureadc: zero resid");
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158 #else
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159 return (EINVAL);
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160 #endif
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161 again:
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162 if (uio->uio_iovcnt <= 0)
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163 #ifdef DIAGNOSTIC
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164 panic("ureadc: non-positive iovcnt");
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165 #else
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166 return (EINVAL);
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167 #endif
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168 iov = uio->uio_iov;
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169 if (iov->iov_len <= 0) {
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170 uio->uio_iovcnt--;
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171 uio->uio_iov++;
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172 goto again;
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173 }
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174 switch (uio->uio_segflg) {
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175
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176 case UIO_USERSPACE:
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177 if (subyte(iov->iov_base, c) < 0)
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178 return (EFAULT);
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179 break;
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180
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181 case UIO_SYSSPACE:
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182 *(char *)iov->iov_base = c;
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183 break;
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184 }
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185 iov->iov_base++;
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186 iov->iov_len--;
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187 uio->uio_resid--;
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188 uio->uio_offset++;
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189 return (0);
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190 }
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191 #endif // __ECOS
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192
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193 /*
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194 * General routine to allocate a hash table.
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195 */
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196 #ifdef __ECOS
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197 void *
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198 hashinit(int elements, int type, int flags, u_long *hashmask)
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199 #else
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200 void *
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201 hashinit(elements, type, flags, hashmask)
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202 int elements, type, flags;
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203 u_long *hashmask;
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204 #endif
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205 {
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206 long hashsize;
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207 LIST_HEAD(generic, generic) *hashtbl;
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208 int i;
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209
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210 if (elements <= 0)
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211 panic("hashinit: bad cnt");
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212 for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
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213 continue;
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214 hashsize >>= 1;
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215 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, flags);
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216 for (i = 0; i < hashsize; i++)
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217 LIST_INIT(&hashtbl[i]);
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218 *hashmask = hashsize - 1;
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219 return (hashtbl);
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220 }
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221
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222 #ifndef __ECOS
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223 /*
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224 * "Shutdown hook" types, functions, and variables.
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225 */
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226
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227 struct shutdownhook_desc {
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228 LIST_ENTRY(shutdownhook_desc) sfd_list;
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229 void (*sfd_fn) __P((void *));
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230 void *sfd_arg;
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231 };
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232
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233 LIST_HEAD(, shutdownhook_desc) shutdownhook_list;
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234
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235 int shutdownhooks_done;
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236
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237 void *
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238 shutdownhook_establish(fn, arg)
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239 void (*fn) __P((void *));
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240 void *arg;
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241 {
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242 struct shutdownhook_desc *ndp;
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243
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244 ndp = (struct shutdownhook_desc *)
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245 malloc(sizeof (*ndp), M_DEVBUF, M_NOWAIT);
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246 if (ndp == NULL)
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247 return NULL;
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248
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249 ndp->sfd_fn = fn;
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250 ndp->sfd_arg = arg;
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251 LIST_INSERT_HEAD(&shutdownhook_list, ndp, sfd_list);
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252
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253 return (ndp);
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254 }
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255
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256 void
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257 shutdownhook_disestablish(vhook)
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258 void *vhook;
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259 {
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260 #ifdef DIAGNOSTIC
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261 struct shutdownhook_desc *dp;
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262
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263 for (dp = shutdownhook_list.lh_first; dp != NULL;
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264 dp = dp->sfd_list.le_next)
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265 if (dp == vhook)
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266 break;
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267 if (dp == NULL)
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268 panic("shutdownhook_disestablish: hook not established");
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269 #endif
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270
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271 LIST_REMOVE((struct shutdownhook_desc *)vhook, sfd_list);
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272 }
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273
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274 /*
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275 * Run shutdown hooks. Should be invoked immediately before the
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276 * system is halted or rebooted, i.e. after file systems unmounted,
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277 * after crash dump done, etc.
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278 */
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279 void
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280 doshutdownhooks()
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281 {
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282 struct shutdownhook_desc *dp;
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283
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284 if (shutdownhooks_done)
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285 return;
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286
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287 for (dp = shutdownhook_list.lh_first; dp != NULL; dp =
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288 dp->sfd_list.le_next)
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289 (*dp->sfd_fn)(dp->sfd_arg);
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290 }
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291
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292 /*
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293 * "Power hook" types, functions, and variables.
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294 */
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295
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296 struct powerhook_desc {
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297 LIST_ENTRY(powerhook_desc) sfd_list;
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298 void (*sfd_fn) __P((int, void *));
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299 void *sfd_arg;
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300 };
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301
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302 LIST_HEAD(, powerhook_desc) powerhook_list;
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303
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304 void *
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305 powerhook_establish(fn, arg)
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306 void (*fn) __P((int, void *));
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307 void *arg;
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308 {
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309 struct powerhook_desc *ndp;
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310
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311 ndp = (struct powerhook_desc *)
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312 malloc(sizeof(*ndp), M_DEVBUF, M_NOWAIT);
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313 if (ndp == NULL)
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314 return NULL;
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315
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316 ndp->sfd_fn = fn;
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317 ndp->sfd_arg = arg;
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318 LIST_INSERT_HEAD(&powerhook_list, ndp, sfd_list);
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319
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320 return (ndp);
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321 }
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322
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323 void
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324 powerhook_disestablish(vhook)
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325 void *vhook;
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326 {
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327 #ifdef DIAGNOSTIC
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328 struct powerhook_desc *dp;
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329
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330 for (dp = powerhook_list.lh_first; dp != NULL;
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331 dp = dp->sfd_list.le_next)
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332 if (dp == vhook)
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333 break;
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334 if (dp == NULL)
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335 panic("powerhook_disestablish: hook not established");
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336 #endif
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337
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338 LIST_REMOVE((struct powerhook_desc *)vhook, sfd_list);
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339 free(vhook, M_DEVBUF);
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340 }
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341
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342 /*
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343 * Run power hooks.
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344 */
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345 void
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346 dopowerhooks(why)
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347 int why;
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348 {
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349 struct powerhook_desc *dp;
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350
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351 for (dp = LIST_FIRST(&powerhook_list);
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352 dp != NULL;
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353 dp = LIST_NEXT(dp, sfd_list)) {
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354 (*dp->sfd_fn)(why, dp->sfd_arg);
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355 }
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356 }
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357 #endif // __ECOS