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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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28
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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() for the file parts below 2G only,
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17 * see src/os/unix/ngx_linux_config.h
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0
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18 *
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19 * Linux 2.4.21 has a new sendfile64() syscall #239.
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20 */
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21
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22
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23 #define NGX_HEADERS 8
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24
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25
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26 ngx_chain_t *ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
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27 off_t limit)
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28 {
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22
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29 int rc, tcp_nodelay;
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0
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30 u_char *prev;
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22
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31 off_t size, send, prev_send, aligned, sent, fprev;
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32 size_t file_size;
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0
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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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4
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40 #if (NGX_HAVE_SENDFILE64)
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0
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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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22
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52
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53 /* the maximum limit size is the maximum size_t value - the page size */
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54
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26
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55 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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56 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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57 }
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58
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59
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0
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60 send = 0;
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61
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62 header.elts = headers;
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63 header.size = sizeof(struct iovec);
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64 header.nalloc = NGX_HEADERS;
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65 header.pool = c->pool;
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66
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67 for ( ;; ) {
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68 file = NULL;
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22
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69 file_size = 0;
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0
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70 eintr = 0;
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71 complete = 0;
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22
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72 prev_send = send;
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0
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73
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74 header.nelts = 0;
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75
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76 prev = NULL;
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77 iov = NULL;
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78
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79 /* create the iovec and coalesce the neighbouring bufs */
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80
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81 for (cl = in;
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82 cl && header.nelts < IOV_MAX && send < limit;
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83 cl = cl->next)
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84 {
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85 if (ngx_buf_special(cl->buf)) {
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86 continue;
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87 }
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88
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28
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89 #if 1
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90 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) {
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91 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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32
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92 "zero size buf in sendfile "
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93 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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94 cl->buf->temporary,
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95 cl->buf->recycled,
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96 cl->buf->in_file,
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97 cl->buf->start,
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98 cl->buf->pos,
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99 cl->buf->last,
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100 cl->buf->file,
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101 cl->buf->file_pos,
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102 cl->buf->file_last);
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103
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28
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104 ngx_debug_point();
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105 }
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106 #endif
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107
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0
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108 if (!ngx_buf_in_memory_only(cl->buf)) {
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109 break;
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110 }
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111
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112 size = cl->buf->last - cl->buf->pos;
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113
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114 if (send + size > limit) {
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115 size = limit - send;
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116 }
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117
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118 if (prev == cl->buf->pos) {
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22
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119 iov->iov_len += (size_t) size;
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0
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120
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121 } else {
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122 if (!(iov = ngx_array_push(&header))) {
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123 return NGX_CHAIN_ERROR;
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124 }
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125
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126 iov->iov_base = (void *) cl->buf->pos;
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22
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127 iov->iov_len = (size_t) size;
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0
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128 }
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129
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130 prev = cl->buf->pos + (size_t) size;
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0
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131 send += size;
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132 }
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133
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134 /* set TCP_CORK if there is a header before a file */
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135
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136 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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137 && header.nelts != 0
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138 && cl
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139 && cl->buf->in_file)
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140 {
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22
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141 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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142
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32
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143 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
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22
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144
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145 tcp_nodelay = 0;
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146
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147 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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148 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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149 {
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150 err = ngx_errno;
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0
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151
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22
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152 /*
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28
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153 * there is a tiny chance to be interrupted, however,
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154 * we continue a processing with the TCP_NODELAY
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155 * and without the TCP_CORK
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156 */
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157
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158 if (err != NGX_EINTR) {
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159 wev->error = 1;
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32
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160 ngx_connection_error(c, err,
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161 "setsockopt(TCP_NODELAY) failed");
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162 return NGX_CHAIN_ERROR;
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163 }
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164
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165 } else {
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32
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166 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
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0
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167
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168 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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169 "no tcp_nodelay");
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0
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170 }
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171 }
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172
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173 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
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22
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174
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175 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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176 err = ngx_errno;
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0
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177
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178 /*
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179 * there is a tiny chance to be interrupted, however,
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180 * we continue a processing without the TCP_CORK
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181 */
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0
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182
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183 if (err != NGX_EINTR) {
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184 wev->error = 1;
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185 ngx_connection_error(c, err,
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186 ngx_tcp_nopush_n " failed");
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187 return NGX_CHAIN_ERROR;
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188 }
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189
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190 } else {
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191 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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192
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193 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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194 "tcp_nopush");
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195 }
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0
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196 }
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197 }
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198
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199 /* get the file buf */
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200
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201 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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202 file = cl->buf;
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203
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204 /* coalesce the neighbouring file bufs */
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205
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206 do {
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207 size = cl->buf->file_last - cl->buf->file_pos;
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0
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208
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209 if (send + size > limit) {
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210 size = limit - send;
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211
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212 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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213 & ~(ngx_pagesize - 1);
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214
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215 if (aligned <= cl->buf->file_last) {
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216 size = aligned - cl->buf->file_pos;
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217 }
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218 }
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219
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220 file_size += (size_t) size;
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221 send += size;
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222 fprev = cl->buf->file_pos + size;
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223 cl = cl->next;
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224
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225 } while (cl
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226 && cl->buf->in_file
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227 && send < limit
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228 && file->file->fd == cl->buf->file->fd
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229 && fprev == cl->buf->file_pos);
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230 }
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231
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232 if (file) {
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4
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233 #if (NGX_HAVE_SENDFILE64)
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0
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234 offset = file->file_pos;
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235 #else
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236 offset = (int32_t) file->file_pos;
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237 #endif
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238 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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0
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239
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240 if (rc == -1) {
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241 err = ngx_errno;
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242
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243 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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244 if (err == NGX_EINTR) {
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245 eintr = 1;
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246 }
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247
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248 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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249 "sendfile() is not ready");
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250
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251 } else {
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252 wev->error = 1;
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253 ngx_connection_error(c, err, "sendfile() failed");
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254 return NGX_CHAIN_ERROR;
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255 }
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256 }
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257
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258 sent = rc > 0 ? rc : 0;
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259
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260 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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261 "sendfile: %d, @%O %O:%uz",
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262 rc, file->file_pos, sent, file_size);
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0
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263
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264 } else {
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265 rc = writev(c->fd, header.elts, header.nelts);
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266
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267 if (rc == -1) {
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268 err = ngx_errno;
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269
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270 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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271 if (err == NGX_EINTR) {
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272 eintr = 1;
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273 }
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274
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275 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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276 "writev() not ready");
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277
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278 } else {
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279 wev->error = 1;
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280 ngx_connection_error(c, err, "writev() failed");
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281 return NGX_CHAIN_ERROR;
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282 }
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283 }
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284
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285 sent = rc > 0 ? rc : 0;
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286
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287 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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288 }
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289
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290 if (send - prev_send == sent) {
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291 complete = 1;
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292 }
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293
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294 c->sent += sent;
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295
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296 for (cl = in; cl; cl = cl->next) {
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297
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298 if (ngx_buf_special(cl->buf)) {
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299 continue;
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300 }
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301
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302 if (sent == 0) {
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303 break;
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304 }
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305
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306 size = ngx_buf_size(cl->buf);
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307
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308 if (sent >= size) {
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309 sent -= size;
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310
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311 if (ngx_buf_in_memory(cl->buf)) {
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312 cl->buf->pos = cl->buf->last;
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313 }
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314
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315 if (cl->buf->in_file) {
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316 cl->buf->file_pos = cl->buf->file_last;
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317 }
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318
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319 continue;
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320 }
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321
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322 if (ngx_buf_in_memory(cl->buf)) {
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323 cl->buf->pos += (size_t) sent;
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0
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324 }
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325
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326 if (cl->buf->in_file) {
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327 cl->buf->file_pos += sent;
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328 }
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329
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330 break;
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331 }
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332
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333 if (eintr) {
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334 continue;
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335 }
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336
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337 if (!complete) {
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338 wev->ready = 0;
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339 return cl;
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340 }
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341
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342 if (send >= limit || cl == NULL) {
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343 return cl;
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344 }
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345
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346 in = cl;
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347 }
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348 }
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