1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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5 | * Copyright (c) 1996-1999 by Internet Software Consortium |
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6 | * |
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7 | * Permission to use, copy, modify, and distribute this software for any |
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8 | * purpose with or without fee is hereby granted, provided that the above |
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9 | * copyright notice and this permission notice appear in all copies. |
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10 | * |
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11 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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17 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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18 | */ |
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19 | |
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20 | /* ev_streams.c - implement asynch stream file IO for the eventlib |
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21 | * vix 04mar96 [initial] |
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22 | */ |
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23 | |
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24 | #if !defined(LINT) && !defined(CODECENTER) |
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25 | static const char rcsid[] = "$Id: ev_streams.c,v 1.5 2005/04/27 04:56:36 sra Exp $"; |
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26 | #endif |
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27 | #include <sys/cdefs.h> |
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28 | __FBSDID("$FreeBSD$"); |
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29 | |
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30 | #include "port_before.h" |
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31 | #ifndef _LIBC |
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32 | #include "fd_setsize.h" |
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33 | #endif |
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34 | |
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35 | #include <sys/types.h> |
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36 | #include <sys/uio.h> |
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37 | |
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38 | #include <errno.h> |
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39 | |
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40 | #include <isc/eventlib.h> |
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41 | #ifndef _LIBC |
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42 | #include <isc/assertions.h> |
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43 | #endif |
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44 | #include "eventlib_p.h" |
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45 | |
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46 | #include "port_after.h" |
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47 | |
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48 | #ifndef _LIBC |
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49 | static int copyvec(evStream *str, const struct iovec *iov, int iocnt); |
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50 | static void consume(evStream *str, size_t bytes); |
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51 | static void done(evContext opaqueCtx, evStream *str); |
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52 | static void writable(evContext opaqueCtx, void *uap, int fd, int evmask); |
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53 | static void readable(evContext opaqueCtx, void *uap, int fd, int evmask); |
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54 | #endif |
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55 | |
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56 | struct iovec |
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57 | evConsIovec(void *buf, size_t cnt) { |
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58 | struct iovec ret; |
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59 | |
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60 | memset(&ret, 0xf5, sizeof ret); |
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61 | ret.iov_base = buf; |
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62 | ret.iov_len = cnt; |
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63 | return (ret); |
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64 | } |
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65 | |
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66 | #ifndef _LIBC |
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67 | int |
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68 | evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, |
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69 | evStreamFunc func, void *uap, evStreamID *id) |
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70 | { |
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71 | evContext_p *ctx = opaqueCtx.opaque; |
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72 | evStream *new; |
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73 | int save; |
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74 | |
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75 | OKNEW(new); |
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76 | new->func = func; |
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77 | new->uap = uap; |
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78 | new->fd = fd; |
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79 | new->flags = 0; |
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80 | if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0) |
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81 | goto free; |
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82 | if (copyvec(new, iov, iocnt) < 0) |
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83 | goto free; |
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84 | new->prevDone = NULL; |
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85 | new->nextDone = NULL; |
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86 | if (ctx->streams != NULL) |
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87 | ctx->streams->prev = new; |
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88 | new->prev = NULL; |
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89 | new->next = ctx->streams; |
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90 | ctx->streams = new; |
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91 | if (id != NULL) |
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92 | id->opaque = new; |
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93 | return (0); |
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94 | free: |
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95 | save = errno; |
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96 | FREE(new); |
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97 | errno = save; |
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98 | return (-1); |
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99 | } |
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100 | |
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101 | int |
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102 | evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, |
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103 | evStreamFunc func, void *uap, evStreamID *id) |
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104 | { |
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105 | evContext_p *ctx = opaqueCtx.opaque; |
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106 | evStream *new; |
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107 | int save; |
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108 | |
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109 | OKNEW(new); |
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110 | new->func = func; |
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111 | new->uap = uap; |
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112 | new->fd = fd; |
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113 | new->flags = 0; |
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114 | if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0) |
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115 | goto free; |
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116 | if (copyvec(new, iov, iocnt) < 0) |
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117 | goto free; |
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118 | new->prevDone = NULL; |
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119 | new->nextDone = NULL; |
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120 | if (ctx->streams != NULL) |
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121 | ctx->streams->prev = new; |
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122 | new->prev = NULL; |
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123 | new->next = ctx->streams; |
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124 | ctx->streams = new; |
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125 | if (id) |
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126 | id->opaque = new; |
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127 | return (0); |
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128 | free: |
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129 | save = errno; |
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130 | FREE(new); |
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131 | errno = save; |
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132 | return (-1); |
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133 | } |
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134 | |
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135 | int |
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136 | evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ { |
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137 | evStream *str = id.opaque; |
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138 | |
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139 | UNUSED(opaqueCtx); |
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140 | |
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141 | str->timer = timer; |
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142 | str->flags |= EV_STR_TIMEROK; |
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143 | return (0); |
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144 | } |
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145 | |
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146 | int |
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147 | evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ { |
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148 | evStream *str = id.opaque; |
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149 | |
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150 | UNUSED(opaqueCtx); |
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151 | |
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152 | str->flags &= ~EV_STR_TIMEROK; |
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153 | return (0); |
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154 | } |
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155 | |
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156 | int |
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157 | evCancelRW(evContext opaqueCtx, evStreamID id) { |
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158 | evContext_p *ctx = opaqueCtx.opaque; |
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159 | evStream *old = id.opaque; |
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160 | |
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161 | /* |
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162 | * The streams list is doubly threaded. First, there's ctx->streams |
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163 | * that's used by evDestroy() to find and cancel all streams. Second, |
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164 | * there's ctx->strDone (head) and ctx->strLast (tail) which thread |
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165 | * through the potentially smaller number of "IO completed" streams, |
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166 | * used in evGetNext() to avoid scanning the entire list. |
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167 | */ |
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168 | |
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169 | /* Unlink from ctx->streams. */ |
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170 | if (old->prev != NULL) |
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171 | old->prev->next = old->next; |
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172 | else |
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173 | ctx->streams = old->next; |
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174 | if (old->next != NULL) |
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175 | old->next->prev = old->prev; |
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176 | |
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177 | /* |
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178 | * If 'old' is on the ctx->strDone list, remove it. Update |
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179 | * ctx->strLast if necessary. |
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180 | */ |
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181 | if (old->prevDone == NULL && old->nextDone == NULL) { |
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182 | /* |
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183 | * Either 'old' is the only item on the done list, or it's |
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184 | * not on the done list. If the former, then we unlink it |
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185 | * from the list. If the latter, we leave the list alone. |
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186 | */ |
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187 | if (ctx->strDone == old) { |
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188 | ctx->strDone = NULL; |
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189 | ctx->strLast = NULL; |
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190 | } |
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191 | } else { |
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192 | if (old->prevDone != NULL) |
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193 | old->prevDone->nextDone = old->nextDone; |
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194 | else |
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195 | ctx->strDone = old->nextDone; |
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196 | if (old->nextDone != NULL) |
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197 | old->nextDone->prevDone = old->prevDone; |
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198 | else |
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199 | ctx->strLast = old->prevDone; |
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200 | } |
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201 | |
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202 | /* Deallocate the stream. */ |
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203 | if (old->file.opaque) |
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204 | evDeselectFD(opaqueCtx, old->file); |
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205 | memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount); |
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206 | FREE(old); |
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207 | return (0); |
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208 | } |
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209 | |
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210 | /* Copy a scatter/gather vector and initialize a stream handler's IO. */ |
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211 | static int |
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212 | copyvec(evStream *str, const struct iovec *iov, int iocnt) { |
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213 | int i; |
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214 | |
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215 | str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt); |
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216 | if (str->iovOrig == NULL) { |
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217 | errno = ENOMEM; |
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218 | return (-1); |
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219 | } |
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220 | str->ioTotal = 0; |
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221 | for (i = 0; i < iocnt; i++) { |
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222 | str->iovOrig[i] = iov[i]; |
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223 | str->ioTotal += iov[i].iov_len; |
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224 | } |
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225 | str->iovOrigCount = iocnt; |
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226 | str->iovCur = str->iovOrig; |
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227 | str->iovCurCount = str->iovOrigCount; |
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228 | str->ioDone = 0; |
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229 | return (0); |
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230 | } |
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231 | |
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232 | /* Pull off or truncate lead iovec(s). */ |
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233 | static void |
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234 | consume(evStream *str, size_t bytes) { |
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235 | while (bytes > 0U) { |
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236 | if (bytes < (size_t)str->iovCur->iov_len) { |
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237 | str->iovCur->iov_len -= bytes; |
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238 | str->iovCur->iov_base = (void *) |
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239 | ((u_char *)str->iovCur->iov_base + bytes); |
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240 | str->ioDone += bytes; |
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241 | bytes = 0; |
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242 | } else { |
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243 | bytes -= str->iovCur->iov_len; |
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244 | str->ioDone += str->iovCur->iov_len; |
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245 | str->iovCur++; |
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246 | str->iovCurCount--; |
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247 | } |
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248 | } |
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249 | } |
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250 | |
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251 | /* Add a stream to Done list and deselect the FD. */ |
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252 | static void |
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253 | done(evContext opaqueCtx, evStream *str) { |
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254 | evContext_p *ctx = opaqueCtx.opaque; |
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255 | |
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256 | if (ctx->strLast != NULL) { |
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257 | str->prevDone = ctx->strLast; |
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258 | ctx->strLast->nextDone = str; |
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259 | ctx->strLast = str; |
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260 | } else { |
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261 | INSIST(ctx->strDone == NULL); |
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262 | ctx->strDone = ctx->strLast = str; |
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263 | } |
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264 | evDeselectFD(opaqueCtx, str->file); |
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265 | str->file.opaque = NULL; |
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266 | /* evDrop() will call evCancelRW() on us. */ |
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267 | } |
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268 | |
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269 | /* Dribble out some bytes on the stream. (Called by evDispatch().) */ |
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270 | static void |
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271 | writable(evContext opaqueCtx, void *uap, int fd, int evmask) { |
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272 | evStream *str = uap; |
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273 | int bytes; |
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274 | |
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275 | UNUSED(evmask); |
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276 | |
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277 | bytes = writev(fd, str->iovCur, str->iovCurCount); |
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278 | if (bytes > 0) { |
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279 | if ((str->flags & EV_STR_TIMEROK) != 0) |
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280 | evTouchIdleTimer(opaqueCtx, str->timer); |
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281 | consume(str, bytes); |
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282 | } else { |
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283 | if (bytes < 0 && errno != EINTR) { |
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284 | str->ioDone = -1; |
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285 | str->ioErrno = errno; |
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286 | } |
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287 | } |
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288 | if (str->ioDone == -1 || str->ioDone == str->ioTotal) |
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289 | done(opaqueCtx, str); |
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290 | } |
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291 | |
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292 | /* Scoop up some bytes from the stream. (Called by evDispatch().) */ |
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293 | static void |
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294 | readable(evContext opaqueCtx, void *uap, int fd, int evmask) { |
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295 | evStream *str = uap; |
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296 | int bytes; |
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297 | |
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298 | UNUSED(evmask); |
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299 | |
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300 | bytes = readv(fd, str->iovCur, str->iovCurCount); |
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301 | if (bytes > 0) { |
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302 | if ((str->flags & EV_STR_TIMEROK) != 0) |
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303 | evTouchIdleTimer(opaqueCtx, str->timer); |
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304 | consume(str, bytes); |
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305 | } else { |
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306 | if (bytes == 0) |
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307 | str->ioDone = 0; |
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308 | else { |
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309 | if (errno != EINTR) { |
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310 | str->ioDone = -1; |
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311 | str->ioErrno = errno; |
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312 | } |
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313 | } |
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314 | } |
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315 | if (str->ioDone <= 0 || str->ioDone == str->ioTotal) |
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316 | done(opaqueCtx, str); |
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317 | } |
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318 | #endif |
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319 | |
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320 | /*! \file */ |
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