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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 #if (HAVE_KQUEUE)
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13
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14 ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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15 {
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16 u_char *prev;
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17 ssize_t n, size;
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18 ngx_err_t err;
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19 ngx_array_t io;
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20 ngx_event_t *rev;
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21 struct iovec *iov;
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22
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23 rev = c->read;
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24
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25 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
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26 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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27 "readv: eof:%d, avail:%d, err:%d",
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28 rev->pending_eof, rev->available, rev->kq_errno);
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29
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30 if (rev->available == 0) {
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31 if (rev->pending_eof) {
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32 rev->ready = 0;
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33 rev->eof = 1;
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34
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35 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno,
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36 "kevent() reported about an closed connection");
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37
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38 if (rev->kq_errno) {
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39 rev->error = 1;
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40 ngx_set_socket_errno(rev->kq_errno);
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41 return NGX_ERROR;
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42 }
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43
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44 return 0;
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45
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46 } else {
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47 return NGX_AGAIN;
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48 }
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49 }
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50 }
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51
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52 prev = NULL;
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53 iov = NULL;
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54 size = 0;
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55
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56 ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_ERROR);
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57
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58 /* coalesce the neighbouring bufs */
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59
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60 while (chain) {
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61 if (prev == chain->buf->last) {
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62 iov->iov_len += chain->buf->end - chain->buf->last;
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63
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64 } else {
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65 ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
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66 iov->iov_base = (void *) chain->buf->last;
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67 iov->iov_len = chain->buf->end - chain->buf->last;
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68 }
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69
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70 size += chain->buf->end - chain->buf->last;
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71 prev = chain->buf->end;
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72 chain = chain->next;
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73 }
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74
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75 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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76 "readv: %d, last:%d", io.nelts, iov->iov_len);
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77
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78 rev = c->read;
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79
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80 do {
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81 n = readv(c->fd, (struct iovec *) io.elts, io.nelts);
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82
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83 if (n >= 0) {
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84 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
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85 rev->available -= n;
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86
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87 /*
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88 * rev->available can be negative here because some additional
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89 * bytes can be received between kevent() and recv()
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90 */
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91
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92 if (rev->available <= 0) {
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93 if (!rev->pending_eof) {
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94 rev->ready = 0;
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95 }
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96
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97 if (rev->available < 0) {
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98 rev->available = 0;
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99 }
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100 }
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101
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102 return n;
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103 }
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104
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105 if (n < size) {
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106 rev->ready = 0;
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107 }
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108
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109 if (n == 0) {
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110 rev->eof = 1;
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111 }
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112
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113 return n;
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114 }
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115
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116 err = ngx_socket_errno;
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117
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118 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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119 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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120 "readv() not ready");
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121 n = NGX_AGAIN;
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122
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123 } else {
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124 n = ngx_connection_error(c, err, "readv() failed");
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125 break;
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126 }
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127
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128 } while (err == NGX_EINTR);
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129
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130 rev->ready = 0;
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131
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132 if (n == NGX_ERROR){
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133 c->read->error = 1;
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134 }
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135
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136 return n;
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137 }
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138
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139 #else /* ! NAVE_KQUEUE */
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140
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141 ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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142 {
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143 u_char *prev;
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144 ssize_t n, size;
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145 ngx_err_t err;
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146 ngx_array_t io;
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147 ngx_event_t *rev;
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148 struct iovec *iov;
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149
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150 prev = NULL;
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151 iov = NULL;
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152 size = 0;
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153
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154 ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_ERROR);
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155
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156 /* coalesce the neighbouring bufs */
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157
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158 while (chain) {
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159 if (prev == chain->buf->last) {
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160 iov->iov_len += chain->buf->end - chain->buf->last;
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161
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162 } else {
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163 ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
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164 iov->iov_base = chain->buf->last;
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165 iov->iov_len = chain->buf->end - chain->buf->last;
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166 }
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167
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168 size += chain->buf->end - chain->buf->last;
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169 prev = chain->buf->end;
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170 chain = chain->next;
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171 }
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172
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173 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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174 "readv: %d:%d", io.nelts, iov->iov_len);
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175
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176 rev = c->read;
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177
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178 do {
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179 n = readv(c->fd, (struct iovec *) io.elts, io.nelts);
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180
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181 if (n == 0) {
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182 rev->ready = 0;
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183 rev->eof = 1;
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184
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185 return n;
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186
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187 } else if (n > 0) {
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188
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189 if (n < size && !(ngx_event_flags & NGX_HAVE_GREEDY_EVENT)) {
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190 rev->ready = 0;
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191 }
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192
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193 return n;
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194 }
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195
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196 err = ngx_socket_errno;
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197
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198 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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199 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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200 "readv() not ready");
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201 n = NGX_AGAIN;
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202
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203 } else {
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204 n = ngx_connection_error(c, err, "readv() failed");
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205 break;
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206 }
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207
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208 } while (err == NGX_EINTR);
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209
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210 rev->ready = 0;
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211
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212 if (n == NGX_ERROR){
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213 c->read->error = 1;
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214 }
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215
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216 return n;
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217 }
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218
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219 #endif /* NAVE_KQUEUE */
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