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0
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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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18
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16 * parameter is int32_t and use sendfile() for the file parts below 2G only.
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0
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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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22
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28 int rc, tcp_nodelay;
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0
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29 u_char *prev;
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22
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30 off_t size, send, prev_send, aligned, sent, fprev;
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31 size_t file_size;
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0
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32 ngx_uint_t eintr, complete;
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33 ngx_err_t err;
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34 ngx_buf_t *file;
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35 ngx_array_t header;
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36 ngx_event_t *wev;
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37 ngx_chain_t *cl;
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38 struct iovec *iov, headers[NGX_HEADERS];
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4
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39 #if (NGX_HAVE_SENDFILE64)
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0
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40 off_t offset;
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41 #else
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42 int32_t offset;
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43 #endif
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44
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45 wev = c->write;
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46
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47 if (!wev->ready) {
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48 return in;
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49 }
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50
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22
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51
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52 /* the maximum limit size is the maximum size_t value - the page size */
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53
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26
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54 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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55 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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56 }
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57
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58
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0
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59 send = 0;
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60
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61 header.elts = headers;
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62 header.size = sizeof(struct iovec);
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63 header.nalloc = NGX_HEADERS;
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64 header.pool = c->pool;
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65
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66 for ( ;; ) {
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67 file = NULL;
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22
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68 file_size = 0;
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0
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69 eintr = 0;
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70 complete = 0;
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22
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71 prev_send = send;
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0
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72
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73 header.nelts = 0;
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74
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75 prev = NULL;
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76 iov = NULL;
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77
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78 /* create the iovec and coalesce the neighbouring bufs */
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79
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80 for (cl = in;
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81 cl && header.nelts < IOV_MAX && send < limit;
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82 cl = cl->next)
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83 {
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84 if (ngx_buf_special(cl->buf)) {
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85 continue;
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86 }
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87
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88 if (!ngx_buf_in_memory_only(cl->buf)) {
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89 break;
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90 }
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91
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92 size = cl->buf->last - cl->buf->pos;
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93
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94 if (send + size > limit) {
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95 size = limit - send;
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96 }
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97
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98 if (prev == cl->buf->pos) {
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22
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99 iov->iov_len += (size_t) size;
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0
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100
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101 } else {
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102 if (!(iov = ngx_array_push(&header))) {
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103 return NGX_CHAIN_ERROR;
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104 }
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105
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106 iov->iov_base = (void *) cl->buf->pos;
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22
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107 iov->iov_len = (size_t) size;
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0
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108 }
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109
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22
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110 prev = cl->buf->pos + (size_t) size;
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0
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111 send += size;
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112 }
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113
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114 /* set TCP_CORK if there is a header before a file */
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115
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116 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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117 && header.nelts != 0
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118 && cl
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119 && cl->buf->in_file)
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120 {
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22
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121
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122 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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123
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124 if (c->tcp_nodelay) {
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125
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126 tcp_nodelay = 0;
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127
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128 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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129 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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130 {
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131 err = ngx_errno;
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0
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132
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22
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133 /*
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134 * there is a tiny chance to be interrupted, however
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135 * we continue a processing with the TCP_NODELAY
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136 * and without the TCP_CORK
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137 */
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138
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139 if (err != NGX_EINTR) {
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140 wev->error = 1;
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141 ngx_connection_error(c, ngx_socket_errno,
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142 "setsockopt(TCP_NODELAY) failed");
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143 return NGX_CHAIN_ERROR;
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144 }
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145
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146 } else {
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147 c->tcp_nodelay = 0;
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0
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148
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22
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149 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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150 "no tcp_nodelay");
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0
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151 }
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22
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152 }
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153
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154 if (!c->tcp_nodelay) {
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155
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156 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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157 err = ngx_errno;
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0
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158
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22
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159 /*
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160 * there is a tiny chance to be interrupted, however
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161 * we continue a processing without the TCP_CORK
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162 */
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0
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163
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22
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164 if (err != NGX_EINTR) {
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165 wev->error = 1;
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166 ngx_connection_error(c, err,
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167 ngx_tcp_nopush_n " failed");
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168 return NGX_CHAIN_ERROR;
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169 }
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170
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171 } else {
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172 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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173
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174 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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175 "tcp_nopush");
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176 }
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0
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177 }
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178 }
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179
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180 /* get the file buf */
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181
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182 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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183 file = cl->buf;
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184
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185 /* coalesce the neighbouring file bufs */
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186
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187 do {
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22
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188 size = cl->buf->file_last - cl->buf->file_pos;
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0
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189
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190 if (send + size > limit) {
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191 size = limit - send;
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192
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193 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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194 & ~(ngx_pagesize - 1);
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195
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196 if (aligned <= cl->buf->file_last) {
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197 size = aligned - cl->buf->file_pos;
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198 }
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199 }
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200
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22
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201 file_size += (size_t) size;
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0
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202 send += size;
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203 fprev = cl->buf->file_pos + size;
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204 cl = cl->next;
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205
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206 } while (cl
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207 && cl->buf->in_file
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208 && send < limit
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209 && file->file->fd == cl->buf->file->fd
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210 && fprev == cl->buf->file_pos);
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211 }
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212
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213 if (file) {
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4
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214 #if (NGX_HAVE_SENDFILE64)
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0
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215 offset = file->file_pos;
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216 #else
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217 offset = (int32_t) file->file_pos;
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218 #endif
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22
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219 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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0
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220
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221 if (rc == -1) {
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222 err = ngx_errno;
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223
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224 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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225 if (err == NGX_EINTR) {
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226 eintr = 1;
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227 }
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228
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229 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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230 "sendfile() is not ready");
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231
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232 } else {
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233 wev->error = 1;
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234 ngx_connection_error(c, err, "sendfile() failed");
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235 return NGX_CHAIN_ERROR;
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236 }
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237 }
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238
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239 sent = rc > 0 ? rc : 0;
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240
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241 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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242 "sendfile: %d, @%O %O:%uz",
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243 rc, file->file_pos, sent, file_size);
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0
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244
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245 } else {
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246 rc = writev(c->fd, header.elts, header.nelts);
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247
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248 if (rc == -1) {
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249 err = ngx_errno;
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250
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251 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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252 if (err == NGX_EINTR) {
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253 eintr = 1;
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254 }
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255
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256 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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257 "writev() not ready");
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258
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259 } else {
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260 wev->error = 1;
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261 ngx_connection_error(c, err, "writev() failed");
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262 return NGX_CHAIN_ERROR;
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263 }
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264 }
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265
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266 sent = rc > 0 ? rc : 0;
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267
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268 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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0
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269 }
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270
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271 if (send - prev_send == sent) {
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0
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272 complete = 1;
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273 }
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274
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275 c->sent += sent;
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276
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277 for (cl = in; cl; cl = cl->next) {
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278
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279 if (ngx_buf_special(cl->buf)) {
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280 continue;
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281 }
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282
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283 if (sent == 0) {
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284 break;
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285 }
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286
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287 size = ngx_buf_size(cl->buf);
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288
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289 if (sent >= size) {
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290 sent -= size;
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291
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292 if (ngx_buf_in_memory(cl->buf)) {
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293 cl->buf->pos = cl->buf->last;
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294 }
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295
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296 if (cl->buf->in_file) {
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297 cl->buf->file_pos = cl->buf->file_last;
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298 }
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299
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300 continue;
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301 }
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302
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303 if (ngx_buf_in_memory(cl->buf)) {
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22
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304 cl->buf->pos += (size_t) sent;
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0
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305 }
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306
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307 if (cl->buf->in_file) {
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308 cl->buf->file_pos += sent;
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309 }
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310
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311 break;
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312 }
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313
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314 if (eintr) {
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315 continue;
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316 }
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317
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318 if (!complete) {
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319 wev->ready = 0;
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320 return cl;
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321 }
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322
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323 if (send >= limit || cl == NULL) {
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324 return cl;
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325 }
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326
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327 in = cl;
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328 }
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329 }
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