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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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644
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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13 /*
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28
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14 * Although FreeBSD sendfile() allows to pass a header and a trailer,
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638
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15 * it cannot send a header with a part of the file in one packet until
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16 * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile()
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17 * may send the partially filled packets, i.e. the 8 file pages may be sent
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18 * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet,
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19 * and then again the 11 full 1460-bytes packets.
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20 *
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28
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21 * Threfore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK)
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22 * to postpone the sending - it not only sends a header and the first part of
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23 * the file in one packet, but also sends the file pages in the full packets.
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24 *
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25 * But until FreeBSD 4.5 turning TCP_NOPUSH off does not flush a pending
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26 * data that less than MSS, so that data may be sent with 5 second delay.
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27 * So we do not use TCP_NOPUSH on FreeBSD prior to 4.5, although it can be used
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28 * for non-keepalive HTTP connections.
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29 */
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30
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31
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146
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32 #if (IOV_MAX > 64)
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33 #define NGX_HEADERS 64
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34 #define NGX_TRAILERS 64
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35 #else
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36 #define NGX_HEADERS IOV_MAX
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37 #define NGX_TRAILERS IOV_MAX
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38 #endif
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0
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39
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40
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50
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41 ngx_chain_t *
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42 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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43 {
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44 int rc, flags;
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45 u_char *prev;
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22
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46 off_t size, send, prev_send, aligned, sent, fprev;
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47 size_t header_size, file_size;
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48 ngx_uint_t eintr, eagain, complete;
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49 ngx_err_t err;
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50 ngx_buf_t *file;
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51 ngx_array_t header, trailer;
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52 ngx_event_t *wev;
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53 ngx_chain_t *cl;
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54 struct sf_hdtr hdtr;
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55 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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56
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57 wev = c->write;
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58
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59 if (!wev->ready) {
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60 return in;
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61 }
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62
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18
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63 #if (NGX_HAVE_KQUEUE)
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64
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136
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65 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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66 (void) ngx_connection_error(c, wev->kq_errno,
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67 "kevent() reported about an closed connection");
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68 wev->error = 1;
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69 return NGX_CHAIN_ERROR;
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70 }
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71
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72 #endif
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73
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22
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74 /* the maximum limit size is the maximum size_t value - the page size */
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75
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324
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76 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
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77 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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78 }
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79
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80 send = 0;
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81 eagain = 0;
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82 flags = 0;
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0
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83
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84 header.elts = headers;
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85 header.size = sizeof(struct iovec);
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86 header.nalloc = NGX_HEADERS;
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87 header.pool = c->pool;
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88
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89 trailer.elts = trailers;
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90 trailer.size = sizeof(struct iovec);
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91 trailer.nalloc = NGX_TRAILERS;
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92 trailer.pool = c->pool;
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93
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94 for ( ;; ) {
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95 file = NULL;
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96 file_size = 0;
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97 header_size = 0;
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98 eintr = 0;
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99 complete = 0;
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100 prev_send = send;
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101
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102 header.nelts = 0;
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103 trailer.nelts = 0;
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104
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105 /* create the header iovec and coalesce the neighbouring bufs */
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106
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107 prev = NULL;
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108 iov = NULL;
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109
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110 for (cl = in;
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111 cl && header.nelts < IOV_MAX && send < limit;
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112 cl = cl->next)
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113 {
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114 if (ngx_buf_special(cl->buf)) {
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115 continue;
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116 }
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117
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118 if (!ngx_buf_in_memory_only(cl->buf)) {
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119 break;
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120 }
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121
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122 size = cl->buf->last - cl->buf->pos;
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123
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124 if (send + size > limit) {
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125 size = limit - send;
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126 }
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127
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128 if (prev == cl->buf->pos) {
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129 iov->iov_len += (size_t) size;
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130
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131 } else {
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132 iov = ngx_array_push(&header);
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133 if (iov == NULL) {
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134 return NGX_CHAIN_ERROR;
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135 }
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136
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137 iov->iov_base = (void *) cl->buf->pos;
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138 iov->iov_len = (size_t) size;
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139 }
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140
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141 prev = cl->buf->pos + (size_t) size;
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142 header_size += (size_t) size;
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143 send += size;
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144 }
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145
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146
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147 if (cl && cl->buf->in_file && send < limit) {
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148 file = cl->buf;
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149
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150 /* coalesce the neighbouring file bufs */
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151
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152 do {
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153 size = cl->buf->file_last - cl->buf->file_pos;
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154
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155 if (send + size > limit) {
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156 size = limit - send;
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157
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158 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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159 & ~((off_t) ngx_pagesize - 1);
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160
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161 if (aligned <= cl->buf->file_last) {
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162 size = aligned - cl->buf->file_pos;
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163 }
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164 }
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165
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166 file_size += (size_t) size;
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167 send += size;
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168 fprev = cl->buf->file_pos + size;
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169 cl = cl->next;
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170
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171 } while (cl
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172 && cl->buf->in_file
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173 && send < limit
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174 && file->file->fd == cl->buf->file->fd
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175 && fprev == cl->buf->file_pos);
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176 }
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177
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4
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178
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179 if (file) {
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180
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181 /* create the tailer iovec and coalesce the neighbouring bufs */
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182
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183 prev = NULL;
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184 iov = NULL;
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185
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186 while (cl && header.nelts < IOV_MAX && send < limit) {
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187
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188 if (ngx_buf_special(cl->buf)) {
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189 cl = cl->next;
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190 continue;
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191 }
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192
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193 if (!ngx_buf_in_memory_only(cl->buf)) {
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194 break;
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195 }
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196
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197 size = cl->buf->last - cl->buf->pos;
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198
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199 if (send + size > limit) {
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200 size = limit - send;
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201 }
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202
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203 if (prev == cl->buf->pos) {
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204 iov->iov_len += (size_t) size;
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205
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206 } else {
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207 iov = ngx_array_push(&trailer);
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208 if (iov == NULL) {
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209 return NGX_CHAIN_ERROR;
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210 }
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211
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212 iov->iov_base = (void *) cl->buf->pos;
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213 iov->iov_len = (size_t) size;
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214 }
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215
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216 prev = cl->buf->pos + (size_t) size;
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217 send += size;
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218 cl = cl->next;
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219 }
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220 }
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221
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222 if (file) {
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223
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224 if (ngx_freebsd_use_tcp_nopush
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225 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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226 {
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227 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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228 err = ngx_errno;
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229
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230 /*
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231 * there is a tiny chance to be interrupted, however,
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232 * we continue a processing without the TCP_NOPUSH
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233 */
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234
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235 if (err != NGX_EINTR) {
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236 wev->error = 1;
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237 (void) ngx_connection_error(c, err,
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238 ngx_tcp_nopush_n " failed");
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239 return NGX_CHAIN_ERROR;
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240 }
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241
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242 } else {
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243 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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244
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245 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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246 "tcp_nopush");
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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 * sendfile() does unneeded work if sf_hdtr's count is 0,
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252 * but corresponding pointer is not NULL
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253 */
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254
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255 hdtr.headers = header.nelts ? (struct iovec *) header.elts: NULL;
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256 hdtr.hdr_cnt = header.nelts;
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257 hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL;
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258 hdtr.trl_cnt = trailer.nelts;
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259
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260 /*
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261 * the "nbytes bug" of the old sendfile() syscall:
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262 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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263 */
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264
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265 if (!ngx_freebsd_sendfile_nbytes_bug) {
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266 header_size = 0;
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267 }
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268
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269 sent = 0;
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270
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271 #if (NGX_HAVE_AIO_SENDFILE)
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272 flags = c->aio_sendfile ? SF_NODISKIO : 0;
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273 #endif
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274
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275 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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276 file_size + header_size, &hdtr, &sent, flags);
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277
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278 if (rc == -1) {
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279 err = ngx_errno;
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280
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281 switch (err) {
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282 case NGX_EAGAIN:
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283 eagain = 1;
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284 break;
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285
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286 case NGX_EINTR:
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287 eintr = 1;
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288 break;
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289
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520
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290 #if (NGX_HAVE_AIO_SENDFILE)
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291 case NGX_EBUSY:
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292 c->busy_sendfile = file;
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293 break;
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294 #endif
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295
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296 default:
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297 wev->error = 1;
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298 (void) ngx_connection_error(c, err, "sendfile() failed");
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299 return NGX_CHAIN_ERROR;
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300 }
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301
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302 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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303 "sendfile() sent only %O bytes", sent);
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304
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32
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305 /*
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306 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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307 * on success, although only 0 is documented
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308 */
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309
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524
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310 } else if (rc >= 0 && sent == 0) {
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311
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312 /*
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313 * if rc is OK and sent equal to zero, then someone
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314 * has truncated the file, so the offset became beyond
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315 * the end of the file
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4
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316 */
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317
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318 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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524
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319 "sendfile() reported that \"%s\" was truncated at %O",
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320 file->file->name.data, file->file_pos);
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321
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322 return NGX_CHAIN_ERROR;
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323 }
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324
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325 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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326 "sendfile: %d, @%O %O:%uz",
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327 rc, file->file_pos, sent, file_size + header_size);
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328
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329 } else {
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330 rc = writev(c->fd, header.elts, header.nelts);
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331
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332 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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333 "writev: %d of %uz", rc, header_size);
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334
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335 if (rc == -1) {
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336 err = ngx_errno;
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337
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520
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338 switch (err) {
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339 case NGX_EAGAIN:
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340 break;
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341
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520
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342 case NGX_EINTR:
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343 eintr = 1;
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344 break;
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345
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520
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346 default:
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347 wev->error = 1;
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348 ngx_connection_error(c, err, "writev() failed");
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349 return NGX_CHAIN_ERROR;
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350 }
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520
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351
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352 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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353 "writev() not ready");
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0
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354 }
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355
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356 sent = rc > 0 ? rc : 0;
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357 }
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358
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22
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359 if (send - prev_send == sent) {
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360 complete = 1;
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361 }
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362
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363 c->sent += sent;
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364
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365 for (cl = in; cl; cl = cl->next) {
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366
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367 if (ngx_buf_special(cl->buf)) {
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368 continue;
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369 }
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370
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371 if (sent == 0) {
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372 break;
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373 }
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374
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375 size = ngx_buf_size(cl->buf);
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376
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377 if (sent >= size) {
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378 sent -= size;
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379
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380 if (ngx_buf_in_memory(cl->buf)) {
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381 cl->buf->pos = cl->buf->last;
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382 }
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383
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384 if (cl->buf->in_file) {
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385 cl->buf->file_pos = cl->buf->file_last;
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386 }
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387
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388 continue;
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389 }
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390
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391 if (ngx_buf_in_memory(cl->buf)) {
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392 cl->buf->pos += (size_t) sent;
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0
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393 }
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394
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395 if (cl->buf->in_file) {
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396 cl->buf->file_pos += sent;
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397 }
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398
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399 break;
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400 }
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401
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520
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402 #if (NGX_HAVE_AIO_SENDFILE)
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403 if (c->busy_sendfile) {
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404 return cl;
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405 }
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406 #endif
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407
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0
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408 if (eagain) {
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409
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410 /*
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411 * sendfile() may return EAGAIN, even if it has sent a whole file
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412 * part, it indicates that the successive sendfile() call would
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413 * return EAGAIN right away and would not send anything.
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414 * We use it as a hint.
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415 */
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416
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417 wev->ready = 0;
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418 return cl;
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419 }
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420
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421 if (eintr) {
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422 continue;
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423 }
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424
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425 if (!complete) {
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426 wev->ready = 0;
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427 return cl;
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428 }
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429
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430 if (send >= limit || cl == NULL) {
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431 return cl;
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432 }
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433
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434 in = cl;
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435 }
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436 }
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