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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 * It seems that Darwin 9.4 (Mac OS X 1.5) sendfile() has the same
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14 * old bug as early FreeBSD sendfile() syscall:
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15 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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16 *
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17 * Besides sendfile() has another bug: if one calls sendfile()
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18 * with both a header and a trailer, then sendfile() ignores a file part
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19 * at all and sends only the header and the trailer together.
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20 * For this reason we send a trailer only if there is no a header.
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21 *
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22 * Although sendfile() allows to pass a header or a trailer,
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23 * it may send the header or the trailer and a part of the file
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24 * in different packets. And FreeBSD workaround (TCP_NOPUSH option)
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25 * does not help.
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26 */
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27
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28
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29 #if (IOV_MAX > 64)
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30 #define NGX_HEADERS 64
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31 #define NGX_TRAILERS 64
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32 #else
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33 #define NGX_HEADERS IOV_MAX
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34 #define NGX_TRAILERS IOV_MAX
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35 #endif
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36
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37
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38 ngx_chain_t *
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39 ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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40 {
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41 int rc;
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42 u_char *prev;
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43 off_t size, send, prev_send, aligned, sent, fprev;
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44 off_t header_size, file_size;
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45 ngx_uint_t eintr, eagain, complete;
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46 ngx_err_t err;
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47 ngx_buf_t *file;
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48 ngx_array_t header, trailer;
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49 ngx_event_t *wev;
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50 ngx_chain_t *cl;
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51 struct sf_hdtr hdtr;
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52 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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53
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54 wev = c->write;
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55
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56 if (!wev->ready) {
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57 return in;
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58 }
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59
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60 #if (NGX_HAVE_KQUEUE)
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61
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62 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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63 (void) ngx_connection_error(c, wev->kq_errno,
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64 "kevent() reported about an closed connection");
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65 wev->error = 1;
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66 return NGX_CHAIN_ERROR;
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67 }
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68
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69 #endif
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70
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71 /* the maximum limit size is the maximum size_t value - the page size */
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72
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73 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
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74 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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75 }
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76
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77 send = 0;
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78 eagain = 0;
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79
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80 header.elts = headers;
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81 header.size = sizeof(struct iovec);
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82 header.nalloc = NGX_HEADERS;
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83 header.pool = c->pool;
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84
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85 trailer.elts = trailers;
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86 trailer.size = sizeof(struct iovec);
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87 trailer.nalloc = NGX_TRAILERS;
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88 trailer.pool = c->pool;
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89
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90 for ( ;; ) {
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91 file = NULL;
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92 file_size = 0;
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93 header_size = 0;
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94 eintr = 0;
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95 complete = 0;
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96 prev_send = send;
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97
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98 header.nelts = 0;
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99 trailer.nelts = 0;
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100
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101 /* create the header iovec and coalesce the neighbouring bufs */
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102
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103 prev = NULL;
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104 iov = NULL;
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105
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106 for (cl = in;
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107 cl && header.nelts < IOV_MAX && send < limit;
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108 cl = cl->next)
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109 {
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110 if (ngx_buf_special(cl->buf)) {
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111 continue;
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112 }
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113
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114 if (!ngx_buf_in_memory_only(cl->buf)) {
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115 break;
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116 }
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117
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118 size = cl->buf->last - cl->buf->pos;
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119
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120 if (send + size > limit) {
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121 size = limit - send;
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122 }
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123
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124 if (prev == cl->buf->pos) {
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125 iov->iov_len += (size_t) size;
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126
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127 } else {
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128 iov = ngx_array_push(&header);
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129 if (iov == NULL) {
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130 return NGX_CHAIN_ERROR;
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131 }
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132
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133 iov->iov_base = (void *) cl->buf->pos;
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134 iov->iov_len = (size_t) size;
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135 }
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136
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137 prev = cl->buf->pos + (size_t) size;
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138 header_size += size;
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139 send += size;
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140 }
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141
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142
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143 if (cl && cl->buf->in_file && send < limit) {
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144 file = cl->buf;
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145
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146 /* coalesce the neighbouring file bufs */
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147
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148 do {
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149 size = cl->buf->file_last - cl->buf->file_pos;
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150
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151 if (send + size > limit) {
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152 size = limit - send;
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153
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154 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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155 & ~((off_t) ngx_pagesize - 1);
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156
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157 if (aligned <= cl->buf->file_last) {
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158 size = aligned - cl->buf->file_pos;
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159 }
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160 }
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161
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162 file_size += size;
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163 send += size;
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164 fprev = cl->buf->file_pos + size;
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165 cl = cl->next;
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166
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167 } while (cl
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168 && cl->buf->in_file
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169 && send < limit
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170 && file->file->fd == cl->buf->file->fd
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171 && fprev == cl->buf->file_pos);
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172 }
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173
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174 if (file && header.nelts == 0) {
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175
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176 /* create the tailer iovec and coalesce the neighbouring bufs */
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177
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178 prev = NULL;
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179 iov = NULL;
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180
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181 while (cl && header.nelts < IOV_MAX && send < limit) {
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182
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183 if (ngx_buf_special(cl->buf)) {
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184 cl = cl->next;
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185 continue;
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186 }
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187
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188 if (!ngx_buf_in_memory_only(cl->buf)) {
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189 break;
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190 }
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191
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192 size = cl->buf->last - cl->buf->pos;
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193
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194 if (send + size > limit) {
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195 size = limit - send;
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196 }
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197
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198 if (prev == cl->buf->pos) {
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199 iov->iov_len += (size_t) size;
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200
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201 } else {
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202 iov = ngx_array_push(&trailer);
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203 if (iov == NULL) {
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204 return NGX_CHAIN_ERROR;
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205 }
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206
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207 iov->iov_base = (void *) cl->buf->pos;
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208 iov->iov_len = (size_t) size;
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209 }
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210
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211 prev = cl->buf->pos + (size_t) size;
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212 send += size;
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213 cl = cl->next;
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214 }
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215 }
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216
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217 if (file) {
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218
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219 /*
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220 * sendfile() returns EINVAL if sf_hdtr's count is 0,
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221 * but corresponding pointer is not NULL
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222 */
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223
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224 hdtr.headers = header.nelts ? (struct iovec *) header.elts: NULL;
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225 hdtr.hdr_cnt = header.nelts;
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226 hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL;
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227 hdtr.trl_cnt = trailer.nelts;
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228
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229 sent = header_size + file_size;
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230
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231 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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232 "sendfile: @%O %O h:%O",
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233 file->file_pos, sent, header_size);
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234
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235 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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236 &sent, &hdtr, 0);
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237
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238 if (rc == -1) {
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239 err = ngx_errno;
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240
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241 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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242 if (err == NGX_EINTR) {
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243 eintr = 1;
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244
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245 } else {
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246 eagain = 1;
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247 }
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248
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249 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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250 "sendfile() sent only %O bytes", sent);
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251
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252 } else {
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253 wev->error = 1;
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254 (void) ngx_connection_error(c, err, "sendfile() failed");
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255 return NGX_CHAIN_ERROR;
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256 }
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257 }
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258
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259 if (rc == 0 && sent == 0) {
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260
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261 /*
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262 * if rc and sent equal to zero, then someone
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263 * has truncated the file, so the offset became beyond
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264 * the end of the file
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265 */
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266
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267 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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268 "sendfile() reported that \"%s\" was truncated",
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269 file->file->name.data);
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270
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271 return NGX_CHAIN_ERROR;
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272 }
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273
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274 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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275 "sendfile: %d, @%O %O:%O",
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276 rc, file->file_pos, sent, file_size + header_size);
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277
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278 } else {
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279 rc = writev(c->fd, header.elts, header.nelts);
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280
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281 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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282 "writev: %d of %uz", rc, send);
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283
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284 if (rc == -1) {
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285 err = ngx_errno;
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286
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287 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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288 if (err == NGX_EINTR) {
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289 eintr = 1;
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290 }
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291
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292 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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293 "writev() not ready");
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294
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295 } else {
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296 wev->error = 1;
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297 ngx_connection_error(c, err, "writev() failed");
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298 return NGX_CHAIN_ERROR;
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299 }
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300 }
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301
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302 sent = rc > 0 ? rc : 0;
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303 }
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304
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305 if (send - prev_send == sent) {
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306 complete = 1;
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307 }
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308
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309 c->sent += sent;
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310
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311 for (cl = in; cl; cl = cl->next) {
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312
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313 if (ngx_buf_special(cl->buf)) {
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314 continue;
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315 }
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316
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317 if (sent == 0) {
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318 break;
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319 }
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320
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321 size = ngx_buf_size(cl->buf);
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322
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323 if (sent >= size) {
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324 sent -= size;
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325
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326 if (ngx_buf_in_memory(cl->buf)) {
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327 cl->buf->pos = cl->buf->last;
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328 }
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329
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330 if (cl->buf->in_file) {
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331 cl->buf->file_pos = cl->buf->file_last;
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332 }
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333
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334 continue;
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335 }
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336
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337 if (ngx_buf_in_memory(cl->buf)) {
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338 cl->buf->pos += (size_t) sent;
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339 }
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340
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341 if (cl->buf->in_file) {
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342 cl->buf->file_pos += sent;
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343 }
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344
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345 break;
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346 }
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347
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348 if (eintr) {
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349 continue;
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350 }
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351
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352 if (!complete) {
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353 wev->ready = 0;
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354 return cl;
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355 }
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356
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357 if (send >= limit || cl == NULL) {
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358 return cl;
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359 }
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360
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361 in = cl;
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362 }
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363 }
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