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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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146
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31 #if (IOV_MAX > 64)
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32 #define NGX_HEADERS 64
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33 #define NGX_TRAILERS 64
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34 #else
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35 #define NGX_HEADERS IOV_MAX
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36 #define NGX_TRAILERS IOV_MAX
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37 #endif
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0
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38
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39
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50
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40 ngx_chain_t *
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41 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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42 {
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43 int rc;
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44 u_char *prev;
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22
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45 off_t size, send, prev_send, aligned, sent, fprev;
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46 size_t header_size, file_size;
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0
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47 ngx_uint_t eintr, eagain, complete;
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48 ngx_err_t err;
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49 ngx_buf_t *file;
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50 ngx_array_t header, trailer;
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51 ngx_event_t *wev;
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52 ngx_chain_t *cl;
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53 struct sf_hdtr hdtr;
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54 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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55
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56 wev = c->write;
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57
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58 if (!wev->ready) {
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59 return in;
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60 }
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61
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18
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62 #if (NGX_HAVE_KQUEUE)
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0
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63
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136
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64 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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65 (void) ngx_connection_error(c, wev->kq_errno,
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66 "kevent() reported about an closed connection");
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0
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67 wev->error = 1;
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68 return NGX_CHAIN_ERROR;
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69 }
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70
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71 #endif
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72
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22
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73 /* the maximum limit size is the maximum size_t value - the page size */
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74
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26
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75 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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76 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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77 }
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78
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0
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79 send = 0;
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80 eagain = 0;
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81
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82 header.elts = headers;
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83 header.size = sizeof(struct iovec);
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84 header.nalloc = NGX_HEADERS;
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85 header.pool = c->pool;
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86
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87 trailer.elts = trailers;
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88 trailer.size = sizeof(struct iovec);
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89 trailer.nalloc = NGX_TRAILERS;
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90 trailer.pool = c->pool;
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91
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92 for ( ;; ) {
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93 file = NULL;
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22
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94 file_size = 0;
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95 header_size = 0;
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0
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96 eintr = 0;
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97 complete = 0;
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22
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98 prev_send = send;
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0
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99
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100 header.nelts = 0;
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101 trailer.nelts = 0;
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102
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103 /* create the header iovec and coalesce the neighbouring bufs */
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104
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105 prev = NULL;
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106 iov = NULL;
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107
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108 for (cl = in;
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109 cl && header.nelts < IOV_MAX && send < limit;
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110 cl = cl->next)
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111 {
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112 if (ngx_buf_special(cl->buf)) {
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113 continue;
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114 }
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115
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116 if (!ngx_buf_in_memory_only(cl->buf)) {
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117 break;
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118 }
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119
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120 size = cl->buf->last - cl->buf->pos;
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121
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122 if (send + size > limit) {
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123 size = limit - send;
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124 }
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125
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126 if (prev == 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 } else {
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50
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130 iov = ngx_array_push(&header);
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131 if (iov == NULL) {
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0
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132 return NGX_CHAIN_ERROR;
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133 }
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134
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135 iov->iov_base = (void *) cl->buf->pos;
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22
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136 iov->iov_len = (size_t) size;
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0
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137 }
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138
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22
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139 prev = cl->buf->pos + (size_t) size;
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140 header_size += (size_t) size;
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0
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141 send += size;
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142 }
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143
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144
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145 if (cl && cl->buf->in_file && send < limit) {
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146 file = cl->buf;
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147
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148 /* coalesce the neighbouring file bufs */
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149
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150 do {
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22
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151 size = cl->buf->file_last - cl->buf->file_pos;
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0
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152
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153 if (send + size > limit) {
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154 size = limit - send;
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155
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156 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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298
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157 & ~((off_t) ngx_pagesize - 1);
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0
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158
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159 if (aligned <= cl->buf->file_last) {
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160 size = aligned - cl->buf->file_pos;
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161 }
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162 }
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163
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22
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164 file_size += (size_t) size;
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0
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165 send += size;
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166 fprev = cl->buf->file_pos + size;
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167 cl = cl->next;
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168
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169 } while (cl
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170 && cl->buf->in_file
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171 && send < limit
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172 && file->file->fd == cl->buf->file->fd
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173 && fprev == cl->buf->file_pos);
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174 }
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175
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4
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176
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0
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177 if (file) {
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4
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178
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0
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179 /* create the tailer iovec and coalesce the neighbouring bufs */
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180
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181 prev = NULL;
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182 iov = NULL;
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183
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4
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184 while (cl && header.nelts < IOV_MAX && send < limit) {
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185
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0
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186 if (ngx_buf_special(cl->buf)) {
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4
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187 cl = cl->next;
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0
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188 continue;
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189 }
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190
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191 if (!ngx_buf_in_memory_only(cl->buf)) {
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192 break;
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193 }
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194
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195 size = cl->buf->last - cl->buf->pos;
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196
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197 if (send + size > limit) {
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198 size = limit - send;
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199 }
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200
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201 if (prev == cl->buf->pos) {
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22
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202 iov->iov_len += (size_t) size;
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0
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203
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204 } else {
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50
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205 iov = ngx_array_push(&trailer);
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206 if (iov == NULL) {
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0
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207 return NGX_CHAIN_ERROR;
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208 }
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209
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210 iov->iov_base = (void *) cl->buf->pos;
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22
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211 iov->iov_len = (size_t) size;
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0
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212 }
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213
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22
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214 prev = cl->buf->pos + (size_t) size;
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0
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215 send += size;
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4
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216 cl = cl->next;
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0
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217 }
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218 }
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219
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220 if (file) {
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221
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222 if (ngx_freebsd_use_tcp_nopush
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223 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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224 {
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225 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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226 err = ngx_errno;
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227
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228 /*
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28
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229 * there is a tiny chance to be interrupted, however,
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0
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230 * we continue a processing without the TCP_NOPUSH
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231 */
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232
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233 if (err != NGX_EINTR) {
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234 wev->error = 1;
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86
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235 (void) ngx_connection_error(c, err,
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236 ngx_tcp_nopush_n " failed");
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0
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237 return NGX_CHAIN_ERROR;
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238 }
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239
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240 } else {
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241 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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242
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243 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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244 "tcp_nopush");
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245 }
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246 }
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247
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248 hdtr.headers = (struct iovec *) header.elts;
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249 hdtr.hdr_cnt = header.nelts;
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250 hdtr.trailers = (struct iovec *) trailer.elts;
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251 hdtr.trl_cnt = trailer.nelts;
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252
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253 /*
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254 * the "nbytes bug" of the old sendfile() syscall:
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255 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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256 */
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257
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28
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258 if (!ngx_freebsd_sendfile_nbytes_bug) {
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22
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259 header_size = 0;
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0
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260 }
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261
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262 sent = 0;
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263
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264 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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22
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265 file_size + header_size, &hdtr, &sent, 0);
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0
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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 } else {
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275 eagain = 1;
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276 }
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277
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278 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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22
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279 "sendfile() sent only %O bytes", sent);
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0
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280
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281 } else {
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282 wev->error = 1;
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86
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283 (void) ngx_connection_error(c, err, "sendfile() failed");
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0
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284 return NGX_CHAIN_ERROR;
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285 }
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286 }
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287
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32
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288 /*
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289 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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290 * on success, although only 0 is documented
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291 */
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292
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293 if (rc >= 0 && sent == 0) {
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4
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294
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295 /*
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32
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296 * if rc is OK and sent equal to zero, then someone
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297 * has truncated the file, so the offset became beyond
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298 * the end of the file
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4
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299 */
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300
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301 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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302 "sendfile() reported that \"%s\" was truncated",
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303 file->file->name.data);
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304
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305 return NGX_CHAIN_ERROR;
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306 }
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307
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0
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308 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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309 "sendfile: %d, @%O %O:%uz",
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22
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310 rc, file->file_pos, sent, file_size + header_size);
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0
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311
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312 } else {
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313 rc = writev(c->fd, header.elts, header.nelts);
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314
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315 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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316 "writev: %d of %uz", rc, header_size);
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0
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317
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318 if (rc == -1) {
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319 err = ngx_errno;
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320
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321 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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322 if (err == NGX_EINTR) {
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323 eintr = 1;
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324 }
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325
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326 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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327 "writev() not ready");
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328
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329 } else {
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330 wev->error = 1;
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331 ngx_connection_error(c, err, "writev() failed");
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332 return NGX_CHAIN_ERROR;
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333 }
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334 }
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335
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336 sent = rc > 0 ? rc : 0;
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337 }
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338
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22
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339 if (send - prev_send == sent) {
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0
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340 complete = 1;
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341 }
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342
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343 c->sent += sent;
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344
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345 for (cl = in; cl; cl = cl->next) {
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346
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347 if (ngx_buf_special(cl->buf)) {
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348 continue;
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349 }
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350
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351 if (sent == 0) {
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352 break;
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353 }
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354
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355 size = ngx_buf_size(cl->buf);
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356
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357 if (sent >= size) {
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358 sent -= size;
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359
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360 if (ngx_buf_in_memory(cl->buf)) {
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361 cl->buf->pos = cl->buf->last;
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362 }
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363
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364 if (cl->buf->in_file) {
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365 cl->buf->file_pos = cl->buf->file_last;
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366 }
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367
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368 continue;
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369 }
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370
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371 if (ngx_buf_in_memory(cl->buf)) {
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22
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372 cl->buf->pos += (size_t) sent;
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0
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373 }
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374
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375 if (cl->buf->in_file) {
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376 cl->buf->file_pos += sent;
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377 }
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378
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379 break;
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380 }
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381
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382 if (eagain) {
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383
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384 /*
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28
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385 * sendfile() may return EAGAIN, even if it has sent a whole file
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386 * part, it indicates that the successive sendfile() call would
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0
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387 * return EAGAIN right away and would not send anything.
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388 * We use it as a hint.
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389 */
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390
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391 wev->ready = 0;
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392 return cl;
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393 }
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394
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395 if (eintr) {
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396 continue;
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397 }
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398
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399 if (!complete) {
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400 wev->ready = 0;
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401 return cl;
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402 }
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403
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404 if (send >= limit || cl == NULL) {
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405 return cl;
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406 }
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407
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408 in = cl;
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409 }
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410 }
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