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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 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit
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14 * offsets only and the including <sys/sendfile.h> breaks the compiling
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15 * if off_t is 64 bit wide. So we use own sendfile() definition where offset
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16 * parameter is int32_t and use sendfile() with the file parts below 2G.
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17 *
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18 * Linux 2.4.21 has a new sendfile64() syscall #239.
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19 */
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20
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21
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22 #define NGX_HEADERS 8
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23
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24
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25 ngx_chain_t *ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
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26 off_t limit)
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27 {
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28 int rc;
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29 u_char *prev;
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30 off_t fprev, send, sprev, aligned;
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31 size_t fsize;
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32 ssize_t size, sent;
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33 ngx_uint_t eintr, complete;
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34 ngx_err_t err;
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35 ngx_buf_t *file;
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36 ngx_array_t header;
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37 ngx_event_t *wev;
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38 ngx_chain_t *cl;
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39 struct iovec *iov, headers[NGX_HEADERS];
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40 #if (HAVE_SENDFILE64)
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41 off_t offset;
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42 #else
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43 int32_t offset;
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44 #endif
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45
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46 wev = c->write;
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47
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48 if (!wev->ready) {
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49 return in;
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50 }
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51
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52 send = 0;
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53
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54 header.elts = headers;
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55 header.size = sizeof(struct iovec);
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56 header.nalloc = NGX_HEADERS;
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57 header.pool = c->pool;
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58
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59 for ( ;; ) {
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60 file = NULL;
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61 fsize = 0;
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62 eintr = 0;
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63 complete = 0;
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64 sprev = send;
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65
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66 header.nelts = 0;
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67
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68 prev = NULL;
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69 iov = NULL;
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70
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71 /* create the iovec and coalesce the neighbouring bufs */
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72
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73 for (cl = in;
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74 cl && header.nelts < IOV_MAX && send < limit;
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75 cl = cl->next)
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76 {
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77 if (ngx_buf_special(cl->buf)) {
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78 continue;
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79 }
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80
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81 if (!ngx_buf_in_memory_only(cl->buf)) {
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82 break;
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83 }
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84
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85 size = cl->buf->last - cl->buf->pos;
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86
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87 if (send + size > limit) {
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88 size = limit - send;
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89 }
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90
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91 if (prev == cl->buf->pos) {
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92 iov->iov_len += size;
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93
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94 } else {
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95 if (!(iov = ngx_array_push(&header))) {
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96 return NGX_CHAIN_ERROR;
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97 }
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98
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99 iov->iov_base = (void *) cl->buf->pos;
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100 iov->iov_len = size;
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101 }
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102
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103 prev = cl->buf->pos + size;
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104 send += size;
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105 }
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106
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107 /* set TCP_CORK if there is a header before a file */
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108
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109 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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110 && header.nelts != 0
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111 && cl
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112 && cl->buf->in_file)
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113 {
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114 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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115 err = ngx_errno;
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116
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117 /*
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118 * there is a tiny chance to be interrupted, however
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119 * we continue a processing without the TCP_CORK
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120 */
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121
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122 if (err != NGX_EINTR) {
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123 wev->error = 1;
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124 ngx_connection_error(c, err, ngx_tcp_nopush_n " failed");
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125 return NGX_CHAIN_ERROR;
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126 }
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127
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128 } else {
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129 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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130
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131 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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132 "tcp_nopush");
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133 }
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134 }
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135
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136 /* get the file buf */
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137
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138 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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139 file = cl->buf;
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140
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141 /* coalesce the neighbouring file bufs */
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142
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143 do {
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144 size = (size_t) (cl->buf->file_last - cl->buf->file_pos);
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145
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146 if (send + size > limit) {
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147 size = limit - send;
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148
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149 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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150 & ~(ngx_pagesize - 1);
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151
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152 if (aligned <= cl->buf->file_last) {
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153 size = aligned - cl->buf->file_pos;
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154 }
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155 }
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156
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157 fsize += size;
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158 send += size;
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159 fprev = cl->buf->file_pos + size;
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160 cl = cl->next;
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161
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162 } while (cl
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163 && cl->buf->in_file
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164 && send < limit
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165 && file->file->fd == cl->buf->file->fd
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166 && fprev == cl->buf->file_pos);
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167 }
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168
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169 if (file) {
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170 #if (HAVE_SENDFILE64)
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171 offset = file->file_pos;
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172 #else
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173 offset = (int32_t) file->file_pos;
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174 #endif
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175 rc = sendfile(c->fd, file->file->fd, &offset, fsize);
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176
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177 if (rc == -1) {
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178 err = ngx_errno;
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179
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180 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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181 if (err == NGX_EINTR) {
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182 eintr = 1;
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183 }
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184
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185 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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186 "sendfile() is not ready");
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187
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188 } else {
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189 wev->error = 1;
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190 ngx_connection_error(c, err, "sendfile() failed");
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191 return NGX_CHAIN_ERROR;
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192 }
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193 }
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194
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195 sent = rc > 0 ? rc : 0;
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196
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197 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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198 "sendfile: %d, @" OFF_T_FMT " %d:%d",
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199 rc, file->file_pos, sent, fsize);
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200
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201 } else {
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202 rc = writev(c->fd, header.elts, header.nelts);
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203
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204 if (rc == -1) {
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205 err = ngx_errno;
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206
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207 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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208 if (err == NGX_EINTR) {
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209 eintr = 1;
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210 }
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211
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212 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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213 "writev() not ready");
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214
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215 } else {
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216 wev->error = 1;
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217 ngx_connection_error(c, err, "writev() failed");
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218 return NGX_CHAIN_ERROR;
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219 }
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220 }
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221
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222 sent = rc > 0 ? rc : 0;
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223
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224 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %d", sent);
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225 }
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226
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227 if (send - sprev == sent) {
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228 complete = 1;
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229 }
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230
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231 c->sent += sent;
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232
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233 for (cl = in; cl; cl = cl->next) {
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234
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235 if (ngx_buf_special(cl->buf)) {
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236 continue;
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237 }
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238
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239 if (sent == 0) {
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240 break;
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241 }
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242
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243 size = ngx_buf_size(cl->buf);
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244
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245 if (sent >= size) {
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246 sent -= size;
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247
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248 if (ngx_buf_in_memory(cl->buf)) {
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249 cl->buf->pos = cl->buf->last;
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250 }
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251
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252 if (cl->buf->in_file) {
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253 cl->buf->file_pos = cl->buf->file_last;
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254 }
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255
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256 continue;
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257 }
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258
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259 if (ngx_buf_in_memory(cl->buf)) {
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260 cl->buf->pos += sent;
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261 }
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262
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263 if (cl->buf->in_file) {
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264 cl->buf->file_pos += sent;
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265 }
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266
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267 break;
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268 }
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269
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270 if (eintr) {
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271 continue;
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272 }
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273
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274 if (!complete) {
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275 wev->ready = 0;
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276 return cl;
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277 }
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278
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279 if (send >= limit || cl == NULL) {
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280 return cl;
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281 }
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282
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283 in = cl;
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284 }
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285 }
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