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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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50
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24 * But until FreeBSD 4.5 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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0
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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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50
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32 #define NGX_TRAILERS 8
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0
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33
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34
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50
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35 ngx_chain_t *
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36 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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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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136
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59 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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60 (void) ngx_connection_error(c, wev->kq_errno,
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61 "kevent() reported about an closed connection");
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0
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62 wev->error = 1;
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63 return NGX_CHAIN_ERROR;
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64 }
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65
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66 #endif
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67
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22
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68 /* the maximum limit size is the maximum size_t value - the page size */
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69
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26
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70 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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71 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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72 }
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73
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0
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74 send = 0;
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75 eagain = 0;
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76
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77 header.elts = headers;
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78 header.size = sizeof(struct iovec);
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79 header.nalloc = NGX_HEADERS;
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80 header.pool = c->pool;
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81
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82 trailer.elts = trailers;
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83 trailer.size = sizeof(struct iovec);
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84 trailer.nalloc = NGX_TRAILERS;
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85 trailer.pool = c->pool;
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86
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87 for ( ;; ) {
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88 file = NULL;
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22
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89 file_size = 0;
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90 header_size = 0;
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0
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91 eintr = 0;
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92 complete = 0;
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22
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93 prev_send = send;
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0
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94
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95 header.nelts = 0;
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96 trailer.nelts = 0;
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97
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98 /* create the header iovec and coalesce the neighbouring bufs */
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99
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100 prev = NULL;
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101 iov = NULL;
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102
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103 for (cl = in;
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104 cl && header.nelts < IOV_MAX && send < limit;
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105 cl = cl->next)
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106 {
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107 if (ngx_buf_special(cl->buf)) {
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108 continue;
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109 }
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110
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111 if (!ngx_buf_in_memory_only(cl->buf)) {
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112 break;
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113 }
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114
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115 size = cl->buf->last - cl->buf->pos;
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116
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117 if (send + size > limit) {
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118 size = limit - send;
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119 }
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120
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121 if (prev == cl->buf->pos) {
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22
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122 iov->iov_len += (size_t) size;
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0
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123
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124 } else {
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50
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125 iov = ngx_array_push(&header);
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126 if (iov == NULL) {
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0
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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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50
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200 iov = ngx_array_push(&trailer);
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201 if (iov == NULL) {
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0
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202 return NGX_CHAIN_ERROR;
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203 }
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204
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205 iov->iov_base = (void *) cl->buf->pos;
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22
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206 iov->iov_len = (size_t) size;
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0
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207 }
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208
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22
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209 prev = cl->buf->pos + (size_t) size;
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0
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210 send += size;
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4
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211 cl = cl->next;
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0
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212 }
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213 }
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214
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215 if (file) {
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216
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217 if (ngx_freebsd_use_tcp_nopush
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218 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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219 {
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220 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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221 err = ngx_errno;
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222
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223 /*
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28
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224 * there is a tiny chance to be interrupted, however,
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0
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225 * we continue a processing without the TCP_NOPUSH
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226 */
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227
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228 if (err != NGX_EINTR) {
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229 wev->error = 1;
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86
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230 (void) ngx_connection_error(c, err,
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231 ngx_tcp_nopush_n " failed");
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0
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232 return NGX_CHAIN_ERROR;
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233 }
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234
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235 } else {
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236 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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237
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238 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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239 "tcp_nopush");
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240 }
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241 }
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242
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243 hdtr.headers = (struct iovec *) header.elts;
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244 hdtr.hdr_cnt = header.nelts;
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245 hdtr.trailers = (struct iovec *) trailer.elts;
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246 hdtr.trl_cnt = trailer.nelts;
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247
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248 /*
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249 * the "nbytes bug" of the old sendfile() syscall:
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250 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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251 */
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252
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28
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253 if (!ngx_freebsd_sendfile_nbytes_bug) {
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22
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254 header_size = 0;
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0
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255 }
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256
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257 sent = 0;
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258
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259 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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22
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260 file_size + header_size, &hdtr, &sent, 0);
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0
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261
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262 if (rc == -1) {
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263 err = ngx_errno;
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264
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265 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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266 if (err == NGX_EINTR) {
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267 eintr = 1;
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268
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269 } else {
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270 eagain = 1;
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271 }
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272
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273 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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22
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274 "sendfile() sent only %O bytes", sent);
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0
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275
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276 } else {
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277 wev->error = 1;
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86
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278 (void) ngx_connection_error(c, err, "sendfile() failed");
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0
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279 return NGX_CHAIN_ERROR;
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280 }
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281 }
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282
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32
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283 /*
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284 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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285 * on success, although only 0 is documented
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286 */
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287
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288 if (rc >= 0 && sent == 0) {
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4
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289
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290 /*
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32
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291 * if rc is OK and sent equal to zero, then someone
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292 * has truncated the file, so the offset became beyond
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293 * the end of the file
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4
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294 */
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295
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296 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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297 "sendfile() reported that \"%s\" was truncated",
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298 file->file->name.data);
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299
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300 return NGX_CHAIN_ERROR;
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301 }
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302
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0
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303 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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304 "sendfile: %d, @%O %O:%uz",
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22
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305 rc, file->file_pos, sent, file_size + header_size);
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0
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306
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307 } else {
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308 rc = writev(c->fd, header.elts, header.nelts);
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309
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310 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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311 "writev: %d of %uz", rc, header_size);
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0
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312
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313 if (rc == -1) {
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314 err = ngx_errno;
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315
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316 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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317 if (err == NGX_EINTR) {
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318 eintr = 1;
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319 }
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320
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321 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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322 "writev() not ready");
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323
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324 } else {
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325 wev->error = 1;
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326 ngx_connection_error(c, err, "writev() failed");
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327 return NGX_CHAIN_ERROR;
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328 }
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329 }
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330
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331 sent = rc > 0 ? rc : 0;
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332 }
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333
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22
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334 if (send - prev_send == sent) {
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0
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335 complete = 1;
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336 }
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337
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338 c->sent += sent;
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339
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340 for (cl = in; cl; cl = cl->next) {
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341
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342 if (ngx_buf_special(cl->buf)) {
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343 continue;
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344 }
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345
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346 if (sent == 0) {
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347 break;
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348 }
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349
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350 size = ngx_buf_size(cl->buf);
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351
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352 if (sent >= size) {
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353 sent -= size;
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354
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355 if (ngx_buf_in_memory(cl->buf)) {
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356 cl->buf->pos = cl->buf->last;
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357 }
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358
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359 if (cl->buf->in_file) {
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360 cl->buf->file_pos = cl->buf->file_last;
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361 }
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362
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363 continue;
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364 }
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365
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366 if (ngx_buf_in_memory(cl->buf)) {
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22
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367 cl->buf->pos += (size_t) sent;
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0
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368 }
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369
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370 if (cl->buf->in_file) {
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371 cl->buf->file_pos += sent;
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372 }
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373
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374 break;
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375 }
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376
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377 if (eagain) {
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378
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379 /*
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28
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380 * sendfile() may return EAGAIN, even if it has sent a whole file
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381 * part, it indicates that the successive sendfile() call would
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0
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382 * return EAGAIN right away and would not send anything.
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383 * We use it as a hint.
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384 */
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385
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386 wev->ready = 0;
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387 return cl;
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388 }
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389
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390 if (eintr) {
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391 continue;
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392 }
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393
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394 if (!complete) {
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395 wev->ready = 0;
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396 return cl;
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397 }
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398
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399 if (send >= limit || cl == NULL) {
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400 return cl;
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401 }
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402
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403 in = cl;
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404 }
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405 }
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