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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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520
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45 ngx_uint_t eintr, complete;
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390
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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
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79 header.elts = headers;
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80 header.size = sizeof(struct iovec);
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81 header.nalloc = NGX_HEADERS;
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82 header.pool = c->pool;
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83
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84 trailer.elts = trailers;
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85 trailer.size = sizeof(struct iovec);
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86 trailer.nalloc = NGX_TRAILERS;
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87 trailer.pool = c->pool;
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88
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89 for ( ;; ) {
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90 file = NULL;
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91 file_size = 0;
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92 header_size = 0;
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93 eintr = 0;
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94 complete = 0;
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95 prev_send = send;
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96
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97 header.nelts = 0;
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98 trailer.nelts = 0;
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99
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100 /* create the header iovec and coalesce the neighbouring bufs */
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101
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102 prev = NULL;
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103 iov = NULL;
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104
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105 for (cl = in;
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106 cl && header.nelts < IOV_MAX && send < limit;
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107 cl = cl->next)
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108 {
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109 if (ngx_buf_special(cl->buf)) {
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110 continue;
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111 }
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112
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113 if (!ngx_buf_in_memory_only(cl->buf)) {
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114 break;
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115 }
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116
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117 size = cl->buf->last - cl->buf->pos;
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118
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119 if (send + size > limit) {
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120 size = limit - send;
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121 }
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122
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123 if (prev == cl->buf->pos) {
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124 iov->iov_len += (size_t) size;
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125
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126 } else {
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127 iov = ngx_array_push(&header);
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128 if (iov == NULL) {
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129 return NGX_CHAIN_ERROR;
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130 }
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131
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132 iov->iov_base = (void *) cl->buf->pos;
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133 iov->iov_len = (size_t) size;
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134 }
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135
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136 prev = cl->buf->pos + (size_t) size;
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137 header_size += size;
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138 send += size;
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139 }
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140
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141
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142 if (cl && cl->buf->in_file && send < limit) {
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143 file = cl->buf;
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144
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145 /* coalesce the neighbouring file bufs */
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146
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147 do {
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148 size = cl->buf->file_last - cl->buf->file_pos;
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149
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150 if (send + size > limit) {
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151 size = limit - send;
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152
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153 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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154 & ~((off_t) ngx_pagesize - 1);
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155
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156 if (aligned <= cl->buf->file_last) {
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157 size = aligned - cl->buf->file_pos;
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158 }
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159 }
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160
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161 file_size += size;
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162 send += size;
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163 fprev = cl->buf->file_pos + size;
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164 cl = cl->next;
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165
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166 } while (cl
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167 && cl->buf->in_file
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168 && send < limit
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169 && file->file->fd == cl->buf->file->fd
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170 && fprev == cl->buf->file_pos);
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171 }
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172
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173 if (file && header.nelts == 0) {
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174
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175 /* create the tailer iovec and coalesce the neighbouring bufs */
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176
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177 prev = NULL;
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178 iov = NULL;
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179
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180 while (cl && header.nelts < IOV_MAX && send < limit) {
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181
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182 if (ngx_buf_special(cl->buf)) {
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183 cl = cl->next;
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184 continue;
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185 }
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186
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187 if (!ngx_buf_in_memory_only(cl->buf)) {
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188 break;
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189 }
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190
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191 size = cl->buf->last - cl->buf->pos;
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192
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193 if (send + size > limit) {
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194 size = limit - send;
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195 }
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196
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197 if (prev == cl->buf->pos) {
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198 iov->iov_len += (size_t) size;
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199
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200 } else {
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201 iov = ngx_array_push(&trailer);
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202 if (iov == NULL) {
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203 return NGX_CHAIN_ERROR;
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204 }
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205
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206 iov->iov_base = (void *) cl->buf->pos;
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207 iov->iov_len = (size_t) size;
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208 }
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209
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210 prev = cl->buf->pos + (size_t) size;
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211 send += size;
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212 cl = cl->next;
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213 }
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214 }
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215
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216 if (file) {
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217
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218 /*
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219 * sendfile() returns EINVAL if sf_hdtr's count is 0,
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220 * but corresponding pointer is not NULL
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221 */
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222
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223 hdtr.headers = header.nelts ? (struct iovec *) header.elts: NULL;
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224 hdtr.hdr_cnt = header.nelts;
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225 hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL;
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226 hdtr.trl_cnt = trailer.nelts;
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227
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228 sent = header_size + file_size;
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229
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230 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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231 "sendfile: @%O %O h:%O",
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232 file->file_pos, sent, header_size);
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233
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234 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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235 &sent, &hdtr, 0);
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236
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237 if (rc == -1) {
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238 err = ngx_errno;
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239
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520
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240 switch (err) {
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241 case NGX_EAGAIN:
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242 break;
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390
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243
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520
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244 case NGX_EINTR:
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245 eintr = 1;
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246 break;
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390
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247
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520
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248 default:
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390
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249 wev->error = 1;
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250 (void) ngx_connection_error(c, err, "sendfile() failed");
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251 return NGX_CHAIN_ERROR;
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252 }
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520
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253
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254 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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255 "sendfile() sent only %O bytes", sent);
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390
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256 }
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257
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258 if (rc == 0 && sent == 0) {
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259
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260 /*
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261 * if rc and sent equal to zero, then someone
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262 * has truncated the file, so the offset became beyond
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263 * the end of the file
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264 */
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265
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266 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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267 "sendfile() reported that \"%s\" was truncated",
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268 file->file->name.data);
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269
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270 return NGX_CHAIN_ERROR;
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271 }
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272
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273 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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274 "sendfile: %d, @%O %O:%O",
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275 rc, file->file_pos, sent, file_size + header_size);
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276
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277 } else {
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278 rc = writev(c->fd, header.elts, header.nelts);
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279
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280 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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281 "writev: %d of %uz", rc, send);
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282
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283 if (rc == -1) {
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284 err = ngx_errno;
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285
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520
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286 switch (err) {
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287 case NGX_EAGAIN:
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288 break;
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390
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289
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520
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290 case NGX_EINTR:
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291 eintr = 1;
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292 break;
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390
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293
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520
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294 default:
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390
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295 wev->error = 1;
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296 ngx_connection_error(c, err, "writev() failed");
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297 return NGX_CHAIN_ERROR;
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298 }
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520
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299
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300 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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301 "writev() not ready");
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390
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302 }
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303
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304 sent = rc > 0 ? rc : 0;
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305 }
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306
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307 if (send - prev_send == sent) {
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308 complete = 1;
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309 }
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310
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311 c->sent += sent;
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312
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313 for (cl = in; cl; cl = cl->next) {
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314
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315 if (ngx_buf_special(cl->buf)) {
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316 continue;
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317 }
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318
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319 if (sent == 0) {
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320 break;
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321 }
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322
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323 size = ngx_buf_size(cl->buf);
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324
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325 if (sent >= size) {
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326 sent -= size;
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327
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328 if (ngx_buf_in_memory(cl->buf)) {
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329 cl->buf->pos = cl->buf->last;
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330 }
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331
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332 if (cl->buf->in_file) {
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333 cl->buf->file_pos = cl->buf->file_last;
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334 }
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335
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336 continue;
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337 }
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338
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339 if (ngx_buf_in_memory(cl->buf)) {
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340 cl->buf->pos += (size_t) sent;
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341 }
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342
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343 if (cl->buf->in_file) {
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344 cl->buf->file_pos += sent;
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345 }
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346
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347 break;
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348 }
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349
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350 if (eintr) {
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351 continue;
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352 }
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353
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354 if (!complete) {
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355 wev->ready = 0;
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356 return cl;
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357 }
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358
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359 if (send >= limit || cl == NULL) {
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360 return cl;
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361 }
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362
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363 in = cl;
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364 }
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365 }
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