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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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28
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13 * Although FreeBSD sendfile() allows to pass a header and a trailer,
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0
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14 * it can not send a header with a part of the file in one packet until
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28
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15 * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile()
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0
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16 * may send the partially filled packets, i.e. the 8 file pages may be sent
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17 * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet,
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18 * and then again the 11 full 1460-bytes packets.
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19 *
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28
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20 * Threfore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK)
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21 * to postpone the sending - it not only sends a header and the first part of
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22 * the file in one packet, but also sends the file pages in the full packets.
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0
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23 *
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24 * But until FreeBSD 4.5 the turning TCP_NOPUSH off does not flush a pending
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25 * data that less than MSS so that data may be sent with 5 second delay.
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26 * So we do not use TCP_NOPUSH on FreeBSD prior to 4.5 although it can be used
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27 * for non-keepalive HTTP connections.
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28 */
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29
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30
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31 #define NGX_HEADERS 8
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32 #define NGX_TRAILERS 4
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33
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34
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35 ngx_chain_t *ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
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36 off_t limit)
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37 {
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38 int rc;
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39 u_char *prev;
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22
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40 off_t size, send, prev_send, aligned, sent, fprev;
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41 size_t header_size, file_size;
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0
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42 ngx_uint_t eintr, eagain, complete;
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43 ngx_err_t err;
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44 ngx_buf_t *file;
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45 ngx_array_t header, trailer;
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46 ngx_event_t *wev;
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47 ngx_chain_t *cl;
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48 struct sf_hdtr hdtr;
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49 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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50
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51 wev = c->write;
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52
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53 if (!wev->ready) {
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54 return in;
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55 }
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56
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18
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57 #if (NGX_HAVE_KQUEUE)
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0
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58
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4
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59 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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0
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60 ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno,
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61 "kevent() reported about an closed connection");
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62
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63 wev->error = 1;
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64 return NGX_CHAIN_ERROR;
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65 }
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66
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67 #endif
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68
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22
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69 /* the maximum limit size is the maximum size_t value - the page size */
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70
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26
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71 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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72 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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73 }
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74
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0
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75 send = 0;
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76 eagain = 0;
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77
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78 header.elts = headers;
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79 header.size = sizeof(struct iovec);
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80 header.nalloc = NGX_HEADERS;
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81 header.pool = c->pool;
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82
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83 trailer.elts = trailers;
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84 trailer.size = sizeof(struct iovec);
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85 trailer.nalloc = NGX_TRAILERS;
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86 trailer.pool = c->pool;
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87
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88 for ( ;; ) {
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89 file = NULL;
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22
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90 file_size = 0;
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91 header_size = 0;
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0
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92 eintr = 0;
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93 complete = 0;
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22
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94 prev_send = send;
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0
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95
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96 header.nelts = 0;
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97 trailer.nelts = 0;
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98
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99 /* create the header iovec and coalesce the neighbouring bufs */
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100
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101 prev = NULL;
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102 iov = NULL;
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103
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104 for (cl = in;
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105 cl && header.nelts < IOV_MAX && send < limit;
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106 cl = cl->next)
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107 {
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108 if (ngx_buf_special(cl->buf)) {
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109 continue;
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110 }
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111
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112 if (!ngx_buf_in_memory_only(cl->buf)) {
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113 break;
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114 }
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115
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116 size = cl->buf->last - cl->buf->pos;
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117
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118 if (send + size > limit) {
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119 size = limit - send;
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120 }
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121
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122 if (prev == cl->buf->pos) {
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22
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123 iov->iov_len += (size_t) size;
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0
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124
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125 } else {
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126 if (!(iov = ngx_array_push(&header))) {
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127 return NGX_CHAIN_ERROR;
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128 }
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129
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130 iov->iov_base = (void *) cl->buf->pos;
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22
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131 iov->iov_len = (size_t) size;
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0
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132 }
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133
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22
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134 prev = cl->buf->pos + (size_t) size;
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135 header_size += (size_t) size;
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0
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136 send += size;
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137 }
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138
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139
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140 if (cl && cl->buf->in_file && send < limit) {
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141 file = cl->buf;
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142
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143 /* coalesce the neighbouring file bufs */
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144
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145 do {
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22
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146 size = cl->buf->file_last - cl->buf->file_pos;
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0
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147
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148 if (send + size > limit) {
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149 size = limit - send;
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150
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151 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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152 & ~(ngx_pagesize - 1);
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153
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154 if (aligned <= cl->buf->file_last) {
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155 size = aligned - cl->buf->file_pos;
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156 }
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157 }
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158
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22
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159 file_size += (size_t) size;
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0
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160 send += size;
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161 fprev = cl->buf->file_pos + size;
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162 cl = cl->next;
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163
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164 } while (cl
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165 && cl->buf->in_file
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166 && send < limit
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167 && file->file->fd == cl->buf->file->fd
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168 && fprev == cl->buf->file_pos);
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169 }
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170
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4
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171
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0
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172 if (file) {
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4
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173
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0
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174 /* create the tailer iovec and coalesce the neighbouring bufs */
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175
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176 prev = NULL;
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177 iov = NULL;
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178
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4
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179 while (cl && header.nelts < IOV_MAX && send < limit) {
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180
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0
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181 if (ngx_buf_special(cl->buf)) {
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4
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182 cl = cl->next;
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0
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183 continue;
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184 }
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185
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186 if (!ngx_buf_in_memory_only(cl->buf)) {
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187 break;
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188 }
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189
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190 size = cl->buf->last - cl->buf->pos;
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191
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192 if (send + size > limit) {
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193 size = limit - send;
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194 }
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195
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196 if (prev == cl->buf->pos) {
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22
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197 iov->iov_len += (size_t) size;
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0
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198
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199 } else {
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200 if (!(iov = ngx_array_push(&trailer))) {
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201 return NGX_CHAIN_ERROR;
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202 }
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203
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204 iov->iov_base = (void *) cl->buf->pos;
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22
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205 iov->iov_len = (size_t) size;
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0
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206 }
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207
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22
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208 prev = cl->buf->pos + (size_t) size;
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0
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209 send += size;
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4
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210 cl = cl->next;
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0
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211 }
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212 }
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213
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214 if (file) {
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215
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216 if (ngx_freebsd_use_tcp_nopush
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217 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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218 {
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219 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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220 err = ngx_errno;
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221
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222 /*
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223 * there is a tiny chance to be interrupted, however,
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0
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224 * we continue a processing without the TCP_NOPUSH
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225 */
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226
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227 if (err != NGX_EINTR) {
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228 wev->error = 1;
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229 ngx_connection_error(c, err,
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230 ngx_tcp_nopush_n " failed");
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231 return NGX_CHAIN_ERROR;
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232 }
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233
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234 } else {
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235 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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236
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237 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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238 "tcp_nopush");
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239 }
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240 }
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241
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242 hdtr.headers = (struct iovec *) header.elts;
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243 hdtr.hdr_cnt = header.nelts;
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244 hdtr.trailers = (struct iovec *) trailer.elts;
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245 hdtr.trl_cnt = trailer.nelts;
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246
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247 /*
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248 * the "nbytes bug" of the old sendfile() syscall:
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249 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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250 */
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251
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28
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252 if (!ngx_freebsd_sendfile_nbytes_bug) {
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22
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253 header_size = 0;
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0
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254 }
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255
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256 sent = 0;
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257
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258 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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22
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259 file_size + header_size, &hdtr, &sent, 0);
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0
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260
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261 if (rc == -1) {
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262 err = ngx_errno;
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263
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264 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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265 if (err == NGX_EINTR) {
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266 eintr = 1;
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267
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268 } else {
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269 eagain = 1;
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270 }
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271
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272 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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22
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273 "sendfile() sent only %O bytes", sent);
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0
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274
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275 } else {
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276 wev->error = 1;
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277 ngx_connection_error(c, err, "sendfile() failed");
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278 return NGX_CHAIN_ERROR;
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279 }
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280 }
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281
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32
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282 /*
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283 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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284 * on success, although only 0 is documented
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285 */
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286
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287 if (rc >= 0 && sent == 0) {
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4
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288
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289 /*
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32
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290 * if rc is OK and sent equal to zero, then someone
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291 * has truncated the file, so the offset became beyond
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292 * the end of the file
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4
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293 */
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294
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295 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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296 "sendfile() reported that \"%s\" was truncated",
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297 file->file->name.data);
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298
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299 return NGX_CHAIN_ERROR;
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300 }
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301
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0
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302 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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303 "sendfile: %d, @%O %O:%uz",
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22
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304 rc, file->file_pos, sent, file_size + header_size);
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0
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305
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306 } else {
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307 rc = writev(c->fd, header.elts, header.nelts);
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308
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309 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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310 "writev: %d of %uz", rc, header_size);
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0
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311
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312 if (rc == -1) {
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313 err = ngx_errno;
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314
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315 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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316 if (err == NGX_EINTR) {
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317 eintr = 1;
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318 }
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319
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320 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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321 "writev() not ready");
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322
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323 } else {
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324 wev->error = 1;
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325 ngx_connection_error(c, err, "writev() failed");
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326 return NGX_CHAIN_ERROR;
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327 }
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328 }
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329
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330 sent = rc > 0 ? rc : 0;
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331 }
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332
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22
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333 if (send - prev_send == sent) {
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0
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334 complete = 1;
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335 }
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336
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337 c->sent += sent;
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338
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339 for (cl = in; cl; cl = cl->next) {
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340
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341 if (ngx_buf_special(cl->buf)) {
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342 continue;
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343 }
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344
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345 if (sent == 0) {
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346 break;
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347 }
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348
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349 size = ngx_buf_size(cl->buf);
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350
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351 if (sent >= size) {
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352 sent -= size;
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353
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354 if (ngx_buf_in_memory(cl->buf)) {
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355 cl->buf->pos = cl->buf->last;
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356 }
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357
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358 if (cl->buf->in_file) {
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359 cl->buf->file_pos = cl->buf->file_last;
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360 }
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361
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362 continue;
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363 }
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364
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365 if (ngx_buf_in_memory(cl->buf)) {
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22
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366 cl->buf->pos += (size_t) sent;
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0
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367 }
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368
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369 if (cl->buf->in_file) {
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370 cl->buf->file_pos += sent;
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371 }
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372
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373 break;
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374 }
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375
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376 if (eagain) {
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377
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378 /*
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28
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379 * sendfile() may return EAGAIN, even if it has sent a whole file
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380 * part, it indicates that the successive sendfile() call would
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0
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381 * return EAGAIN right away and would not send anything.
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382 * We use it as a hint.
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383 */
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384
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385 wev->ready = 0;
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386 return cl;
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387 }
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388
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389 if (eintr) {
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390 continue;
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391 }
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392
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393 if (!complete) {
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394 wev->ready = 0;
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395 return cl;
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396 }
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397
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398 if (send >= limit || cl == NULL) {
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399 return cl;
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400 }
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401
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402 in = cl;
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403 }
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404 }
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