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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 /*
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13 * Although FreeBSD sendfile() allows to pass a header and a trailer,
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14 * it can not send a header with a part of the file in one packet until
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28
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15 * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile()
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16 * may send the partially filled packets, i.e. the 8 file pages may be sent
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17 * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet,
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18 * and then again the 11 full 1460-bytes packets.
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19 *
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20 * Threfore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK)
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21 * to postpone the sending - it not only sends a header and the first part of
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22 * the file in one packet, but also sends the file pages in the full packets.
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23 *
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24 * But until FreeBSD 4.5 turning TCP_NOPUSH off does not flush a pending
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25 * data that less than MSS, so that data may be sent with 5 second delay.
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26 * So we do not use TCP_NOPUSH on FreeBSD prior to 4.5, although it can be used
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27 * for non-keepalive HTTP connections.
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28 */
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29
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30
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31 #define NGX_HEADERS 8
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32 #define NGX_TRAILERS 8
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33
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34
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35 ngx_chain_t *
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36 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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37 {
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38 int rc;
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39 u_char *prev;
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40 off_t size, send, prev_send, aligned, sent, fprev;
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41 size_t header_size, file_size;
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42 ngx_uint_t eintr, eagain, complete;
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43 ngx_err_t err;
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44 ngx_buf_t *file;
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45 ngx_array_t header, trailer;
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46 ngx_event_t *wev;
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47 ngx_chain_t *cl;
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48 struct sf_hdtr hdtr;
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49 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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50
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51 wev = c->write;
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52
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53 if (!wev->ready) {
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54 return in;
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55 }
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56
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18
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57 #if (NGX_HAVE_KQUEUE)
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58
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59 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT)
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60 && wev->pending_eof
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61 /* FreeBSD 6.0 may erroneously report ETIMEDOUT */
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62 && wev->kq_errno != NGX_ETIMEDOUT)
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63 {
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64 (void) ngx_connection_error(c, wev->kq_errno,
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65 "kevent() reported about an closed connection");
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66 wev->error = 1;
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67 return NGX_CHAIN_ERROR;
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68 }
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69
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70 #endif
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71
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22
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72 /* the maximum limit size is the maximum size_t value - the page size */
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73
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74 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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75 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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76 }
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77
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78 send = 0;
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79 eagain = 0;
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80
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81 header.elts = headers;
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82 header.size = sizeof(struct iovec);
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83 header.nalloc = NGX_HEADERS;
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84 header.pool = c->pool;
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85
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86 trailer.elts = trailers;
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87 trailer.size = sizeof(struct iovec);
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88 trailer.nalloc = NGX_TRAILERS;
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89 trailer.pool = c->pool;
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90
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91 for ( ;; ) {
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92 file = NULL;
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93 file_size = 0;
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94 header_size = 0;
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95 eintr = 0;
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96 complete = 0;
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97 prev_send = send;
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98
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99 header.nelts = 0;
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100 trailer.nelts = 0;
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101
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102 /* create the header iovec and coalesce the neighbouring bufs */
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103
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104 prev = NULL;
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105 iov = NULL;
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106
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107 for (cl = in;
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108 cl && header.nelts < IOV_MAX && send < limit;
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109 cl = cl->next)
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110 {
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111 if (ngx_buf_special(cl->buf)) {
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112 continue;
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113 }
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114
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115 if (!ngx_buf_in_memory_only(cl->buf)) {
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116 break;
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117 }
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118
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119 size = cl->buf->last - cl->buf->pos;
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120
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121 if (send + size > limit) {
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122 size = limit - send;
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123 }
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124
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125 if (prev == cl->buf->pos) {
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126 iov->iov_len += (size_t) size;
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127
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128 } else {
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129 iov = ngx_array_push(&header);
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130 if (iov == NULL) {
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131 return NGX_CHAIN_ERROR;
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132 }
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133
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134 iov->iov_base = (void *) cl->buf->pos;
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135 iov->iov_len = (size_t) size;
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136 }
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137
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138 prev = cl->buf->pos + (size_t) size;
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139 header_size += (size_t) size;
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140 send += size;
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141 }
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142
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143
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144 if (cl && cl->buf->in_file && send < limit) {
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145 file = cl->buf;
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146
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147 /* coalesce the neighbouring file bufs */
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148
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149 do {
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150 size = cl->buf->file_last - cl->buf->file_pos;
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151
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152 if (send + size > limit) {
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153 size = limit - send;
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154
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155 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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156 & ~(ngx_pagesize - 1);
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157
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158 if (aligned <= cl->buf->file_last) {
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159 size = aligned - cl->buf->file_pos;
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160 }
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161 }
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162
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163 file_size += (size_t) size;
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164 send += size;
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165 fprev = cl->buf->file_pos + size;
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166 cl = cl->next;
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167
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168 } while (cl
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169 && cl->buf->in_file
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170 && send < limit
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171 && file->file->fd == cl->buf->file->fd
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172 && fprev == cl->buf->file_pos);
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173 }
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174
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4
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175
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176 if (file) {
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177
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178 /* create the tailer iovec and coalesce the neighbouring bufs */
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179
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180 prev = NULL;
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181 iov = NULL;
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182
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183 while (cl && header.nelts < IOV_MAX && send < limit) {
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184
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185 if (ngx_buf_special(cl->buf)) {
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186 cl = cl->next;
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187 continue;
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188 }
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189
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190 if (!ngx_buf_in_memory_only(cl->buf)) {
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191 break;
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192 }
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193
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194 size = cl->buf->last - cl->buf->pos;
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195
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196 if (send + size > limit) {
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197 size = limit - send;
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198 }
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199
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200 if (prev == cl->buf->pos) {
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201 iov->iov_len += (size_t) size;
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202
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203 } else {
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204 iov = ngx_array_push(&trailer);
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205 if (iov == NULL) {
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206 return NGX_CHAIN_ERROR;
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207 }
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208
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209 iov->iov_base = (void *) cl->buf->pos;
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210 iov->iov_len = (size_t) size;
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211 }
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212
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213 prev = cl->buf->pos + (size_t) size;
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214 send += size;
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215 cl = cl->next;
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216 }
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217 }
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218
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219 if (file) {
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220
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221 if (ngx_freebsd_use_tcp_nopush
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222 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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223 {
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224 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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225 err = ngx_errno;
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226
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227 /*
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228 * there is a tiny chance to be interrupted, however,
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229 * we continue a processing without the TCP_NOPUSH
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230 */
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231
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232 if (err != NGX_EINTR) {
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233 wev->error = 1;
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234 (void) ngx_connection_error(c, err,
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235 ngx_tcp_nopush_n " failed");
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236 return NGX_CHAIN_ERROR;
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237 }
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238
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239 } else {
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240 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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241
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242 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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243 "tcp_nopush");
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244 }
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245 }
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246
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247 hdtr.headers = (struct iovec *) header.elts;
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248 hdtr.hdr_cnt = header.nelts;
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249 hdtr.trailers = (struct iovec *) trailer.elts;
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250 hdtr.trl_cnt = trailer.nelts;
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251
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252 /*
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253 * the "nbytes bug" of the old sendfile() syscall:
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254 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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255 */
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256
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257 if (!ngx_freebsd_sendfile_nbytes_bug) {
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258 header_size = 0;
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259 }
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260
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261 sent = 0;
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262
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263 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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264 file_size + header_size, &hdtr, &sent, 0);
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265
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266 if (rc == -1) {
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267 err = ngx_errno;
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268
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269 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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270 if (err == NGX_EINTR) {
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271 eintr = 1;
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272
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273 } else {
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274 eagain = 1;
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275 }
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276
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277 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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278 "sendfile() sent only %O bytes", sent);
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279
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280 } else {
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281 wev->error = 1;
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282 (void) ngx_connection_error(c, err, "sendfile() failed");
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283 return NGX_CHAIN_ERROR;
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284 }
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285 }
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286
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287 /*
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288 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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289 * on success, although only 0 is documented
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290 */
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291
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292 if (rc >= 0 && sent == 0) {
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293
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294 /*
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295 * if rc is OK and sent equal to zero, then someone
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296 * has truncated the file, so the offset became beyond
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297 * the end of the file
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298 */
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299
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300 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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301 "sendfile() reported that \"%s\" was truncated",
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302 file->file->name.data);
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303
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304 return NGX_CHAIN_ERROR;
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305 }
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306
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307 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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308 "sendfile: %d, @%O %O:%uz",
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309 rc, file->file_pos, sent, file_size + header_size);
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310
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311 } else {
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312 rc = writev(c->fd, header.elts, header.nelts);
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313
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314 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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315 "writev: %d of %uz", rc, header_size);
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316
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317 if (rc == -1) {
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318 err = ngx_errno;
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319
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320 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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321 if (err == NGX_EINTR) {
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322 eintr = 1;
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323 }
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324
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325 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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326 "writev() not ready");
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327
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328 } else {
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329 wev->error = 1;
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330 ngx_connection_error(c, err, "writev() failed");
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331 return NGX_CHAIN_ERROR;
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332 }
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333 }
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334
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335 sent = rc > 0 ? rc : 0;
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336 }
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337
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338 if (send - prev_send == sent) {
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339 complete = 1;
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340 }
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341
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342 c->sent += sent;
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343
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344 for (cl = in; cl; cl = cl->next) {
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345
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346 if (ngx_buf_special(cl->buf)) {
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347 continue;
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348 }
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349
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350 if (sent == 0) {
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351 break;
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352 }
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353
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354 size = ngx_buf_size(cl->buf);
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355
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356 if (sent >= size) {
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357 sent -= size;
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358
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359 if (ngx_buf_in_memory(cl->buf)) {
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360 cl->buf->pos = cl->buf->last;
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361 }
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362
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363 if (cl->buf->in_file) {
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364 cl->buf->file_pos = cl->buf->file_last;
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365 }
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366
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367 continue;
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368 }
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369
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370 if (ngx_buf_in_memory(cl->buf)) {
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371 cl->buf->pos += (size_t) sent;
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372 }
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373
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374 if (cl->buf->in_file) {
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375 cl->buf->file_pos += sent;
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376 }
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377
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378 break;
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379 }
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380
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381 if (eagain) {
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382
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383 /*
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384 * sendfile() may return EAGAIN, even if it has sent a whole file
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385 * part, it indicates that the successive sendfile() call would
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386 * return EAGAIN right away and would not send anything.
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387 * We use it as a hint.
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388 */
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389
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390 wev->ready = 0;
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391 return cl;
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392 }
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393
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394 if (eintr) {
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395 continue;
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396 }
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397
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398 if (!complete) {
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399 wev->ready = 0;
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400 return cl;
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401 }
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402
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403 if (send >= limit || cl == NULL) {
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404 return cl;
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405 }
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406
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407 in = cl;
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408 }
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409 }
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