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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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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 * So 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
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22 * of 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 the 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 4
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33
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34
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35 ngx_chain_t *ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
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36 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 fprev, sent, send, sprev, aligned;
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41 size_t hsize, fsize;
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42 ssize_t size;
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43 ngx_uint_t eintr, eagain, complete;
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44 ngx_err_t err;
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45 ngx_buf_t *file;
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46 ngx_array_t header, trailer;
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47 ngx_event_t *wev;
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48 ngx_chain_t *cl;
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49 struct sf_hdtr hdtr;
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50 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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51
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52 wev = c->write;
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53
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54 if (!wev->ready) {
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55 return in;
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56 }
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57
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58 #if (HAVE_KQUEUE)
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59
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60 if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && wev->pending_eof) {
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61 ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno,
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62 "kevent() reported about an closed connection");
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63
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64 wev->error = 1;
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65 return NGX_CHAIN_ERROR;
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66 }
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67
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68 #endif
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69
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70 send = 0;
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71 eagain = 0;
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72
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73 header.elts = headers;
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74 header.size = sizeof(struct iovec);
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75 header.nalloc = NGX_HEADERS;
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76 header.pool = c->pool;
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77
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78 trailer.elts = trailers;
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79 trailer.size = sizeof(struct iovec);
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80 trailer.nalloc = NGX_TRAILERS;
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81 trailer.pool = c->pool;
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82
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83 for ( ;; ) {
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84 file = NULL;
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85 fsize = 0;
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86 hsize = 0;
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87 eintr = 0;
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88 complete = 0;
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89 sprev = send;
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90
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91 header.nelts = 0;
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92 trailer.nelts = 0;
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93
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94 /* create the header iovec and coalesce the neighbouring bufs */
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95
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96 prev = NULL;
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97 iov = NULL;
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98
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99 for (cl = in;
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100 cl && header.nelts < IOV_MAX && send < limit;
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101 cl = cl->next)
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102 {
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103 if (ngx_buf_special(cl->buf)) {
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104 continue;
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105 }
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106
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107 if (!ngx_buf_in_memory_only(cl->buf)) {
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108 break;
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109 }
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110
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111 size = cl->buf->last - cl->buf->pos;
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112
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113 if (send + size > limit) {
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114 size = limit - send;
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115 }
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116
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117 if (prev == cl->buf->pos) {
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118 iov->iov_len += size;
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119
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120 } else {
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121 if (!(iov = ngx_array_push(&header))) {
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122 return NGX_CHAIN_ERROR;
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123 }
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124
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125 iov->iov_base = (void *) cl->buf->pos;
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126 iov->iov_len = size;
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127 }
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128
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129 prev = cl->buf->pos + size;
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130 hsize += size;
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131 send += size;
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132 }
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133
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134 /* get the file buf */
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135
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136 if (cl && cl->buf->in_file && send < limit) {
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137 file = cl->buf;
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138
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139 /* coalesce the neighbouring file bufs */
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140
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141 do {
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142 size = (size_t) (cl->buf->file_last - cl->buf->file_pos);
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143
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144 if (send + size > limit) {
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145 size = limit - send;
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146
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147 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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148 & ~(ngx_pagesize - 1);
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149
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150 if (aligned <= cl->buf->file_last) {
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151 size = aligned - cl->buf->file_pos;
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152 }
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153 }
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154
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155 fsize += size;
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156 send += size;
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157 fprev = cl->buf->file_pos + size;
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158 cl = cl->next;
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159
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160 } while (cl
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161 && cl->buf->in_file
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162 && send < limit
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163 && file->file->fd == cl->buf->file->fd
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164 && fprev == cl->buf->file_pos);
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165 }
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166
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167 if (file) {
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168 /* create the tailer iovec and coalesce the neighbouring bufs */
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169
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170 prev = NULL;
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171 iov = NULL;
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172
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173 for (/* void */;
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174 cl && header.nelts < IOV_MAX && send < limit;
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175 cl = cl->next)
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176 {
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177 if (ngx_buf_special(cl->buf)) {
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178 continue;
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179 }
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180
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181 if (!ngx_buf_in_memory_only(cl->buf)) {
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182 break;
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183 }
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184
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185 size = cl->buf->last - cl->buf->pos;
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186
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187 if (send + size > limit) {
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188 size = limit - send;
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189 }
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190
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191 if (prev == cl->buf->pos) {
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192 iov->iov_len += size;
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193
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194 } else {
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195 if (!(iov = ngx_array_push(&trailer))) {
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196 return NGX_CHAIN_ERROR;
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197 }
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198
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199 iov->iov_base = (void *) cl->buf->pos;
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200 iov->iov_len = size;
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201 }
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202
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203 prev = cl->buf->pos + size;
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204 send += size;
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205 }
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206 }
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207
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208 if (file) {
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209
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210 if (ngx_freebsd_use_tcp_nopush
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211 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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212 {
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213
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214 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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215 err = ngx_errno;
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216
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217 /*
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218 * there is a tiny chance to be interrupted, however
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219 * we continue a processing without the TCP_NOPUSH
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220 */
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221
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222 if (err != NGX_EINTR) {
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223 wev->error = 1;
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224 ngx_connection_error(c, err,
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225 ngx_tcp_nopush_n " failed");
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226 return NGX_CHAIN_ERROR;
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227 }
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228
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229 } else {
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230 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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231
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232 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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233 "tcp_nopush");
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234 }
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235 }
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236
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237 hdtr.headers = (struct iovec *) header.elts;
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238 hdtr.hdr_cnt = header.nelts;
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239 hdtr.trailers = (struct iovec *) trailer.elts;
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240 hdtr.trl_cnt = trailer.nelts;
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241
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242 /*
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243 * the "nbytes bug" of the old sendfile() syscall:
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244 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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245 */
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246
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247 if (ngx_freebsd_sendfile_nbytes_bug == 0) {
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248 hsize = 0;
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249 }
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250
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251 sent = 0;
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252
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253 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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254 fsize + hsize, &hdtr, &sent, 0);
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255
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256 if (rc == -1) {
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257 err = ngx_errno;
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258
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259 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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260 if (err == NGX_EINTR) {
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261 eintr = 1;
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262
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263 } else {
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264 eagain = 1;
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265 }
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266
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267 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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268 "sendfile() sent only " OFF_T_FMT " bytes",
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269 sent);
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270
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271 } else {
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272 wev->error = 1;
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273 ngx_connection_error(c, err, "sendfile() failed");
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274 return NGX_CHAIN_ERROR;
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275 }
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276 }
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277
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278 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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279 "sendfile: %d, @" OFF_T_FMT " " OFF_T_FMT ":%d",
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280 rc, file->file_pos, sent, fsize + hsize);
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281
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282 } else {
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283 rc = writev(c->fd, header.elts, header.nelts);
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284
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285 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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286 "writev: %d of " SIZE_T_FMT, rc, hsize);
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287
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288 if (rc == -1) {
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289 err = ngx_errno;
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290
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291 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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292 if (err == NGX_EINTR) {
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293 eintr = 1;
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294 }
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295
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296 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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297 "writev() not ready");
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298
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299 } else {
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300 wev->error = 1;
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301 ngx_connection_error(c, err, "writev() failed");
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302 return NGX_CHAIN_ERROR;
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303 }
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304 }
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305
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306 sent = rc > 0 ? rc : 0;
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307 }
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308
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309 if (send - sprev == sent) {
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310 complete = 1;
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311 }
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312
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313 c->sent += sent;
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314
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315 for (cl = in; cl; cl = cl->next) {
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316
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317 if (ngx_buf_special(cl->buf)) {
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318 continue;
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319 }
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320
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321 if (sent == 0) {
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322 break;
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323 }
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324
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325 size = ngx_buf_size(cl->buf);
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326
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327 if (sent >= size) {
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328 sent -= size;
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329
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330 if (ngx_buf_in_memory(cl->buf)) {
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331 cl->buf->pos = cl->buf->last;
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332 }
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333
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334 if (cl->buf->in_file) {
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335 cl->buf->file_pos = cl->buf->file_last;
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336 }
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337
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338 continue;
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339 }
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340
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341 if (ngx_buf_in_memory(cl->buf)) {
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342 cl->buf->pos += sent;
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343 }
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344
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345 if (cl->buf->in_file) {
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346 cl->buf->file_pos += sent;
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347 }
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348
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349 break;
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350 }
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351
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352 if (eagain) {
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353
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354 /*
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355 * sendfile() can return EAGAIN even if it has sent
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356 * a whole file part but the successive sendfile() call would
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357 * return EAGAIN right away and would not send anything.
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358 * We use it as a hint.
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359 */
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360
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361 wev->ready = 0;
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362 return cl;
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363 }
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364
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365 if (eintr) {
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366 continue;
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367 }
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368
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369 if (!complete) {
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370 wev->ready = 0;
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371 return cl;
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372 }
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373
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374 if (send >= limit || cl == NULL) {
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375 return cl;
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376 }
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377
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378 in = cl;
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379 }
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380 }
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