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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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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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13 /*
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28
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14 * Although FreeBSD sendfile() allows to pass a header and a trailer,
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640
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15 * it cannot send a header with a part of the file in one packet until
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28
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16 * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile()
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0
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17 * may send the partially filled packets, i.e. the 8 file pages may be sent
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18 * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet,
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19 * and then again the 11 full 1460-bytes packets.
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20 *
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670
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21 * Therefore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK)
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28
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22 * to postpone the sending - it not only sends a header and the first part of
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23 * the file in one packet, but also sends the file pages in the full packets.
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0
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24 *
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50
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25 * But until FreeBSD 4.5 turning TCP_NOPUSH off does not flush a pending
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26 * data that less than MSS, so that data may be sent with 5 second delay.
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27 * 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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28 * for non-keepalive HTTP connections.
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29 */
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30
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31
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146
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32 #if (IOV_MAX > 64)
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33 #define NGX_HEADERS 64
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34 #define NGX_TRAILERS 64
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35 #else
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36 #define NGX_HEADERS IOV_MAX
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37 #define NGX_TRAILERS IOV_MAX
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38 #endif
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0
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39
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40
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50
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41 ngx_chain_t *
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42 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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43 {
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520
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44 int rc, flags;
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0
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45 u_char *prev;
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22
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46 off_t size, send, prev_send, aligned, sent, fprev;
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47 size_t header_size, file_size;
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0
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48 ngx_uint_t eintr, eagain, complete;
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49 ngx_err_t err;
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50 ngx_buf_t *file;
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51 ngx_array_t header, trailer;
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52 ngx_event_t *wev;
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53 ngx_chain_t *cl;
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54 struct sf_hdtr hdtr;
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55 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
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56
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57 wev = c->write;
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58
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59 if (!wev->ready) {
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60 return in;
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61 }
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62
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18
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63 #if (NGX_HAVE_KQUEUE)
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0
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64
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136
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65 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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66 (void) ngx_connection_error(c, wev->kq_errno,
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67 "kevent() reported about an closed connection");
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0
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68 wev->error = 1;
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69 return NGX_CHAIN_ERROR;
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70 }
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71
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72 #endif
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73
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22
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74 /* the maximum limit size is the maximum size_t value - the page size */
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75
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324
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76 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
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26
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77 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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78 }
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79
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0
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80 send = 0;
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81 eagain = 0;
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520
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82 flags = 0;
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0
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83
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84 header.elts = headers;
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85 header.size = sizeof(struct iovec);
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86 header.nalloc = NGX_HEADERS;
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87 header.pool = c->pool;
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88
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89 trailer.elts = trailers;
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90 trailer.size = sizeof(struct iovec);
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91 trailer.nalloc = NGX_TRAILERS;
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92 trailer.pool = c->pool;
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93
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94 for ( ;; ) {
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95 file = NULL;
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22
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96 file_size = 0;
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97 header_size = 0;
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0
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98 eintr = 0;
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99 complete = 0;
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22
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100 prev_send = send;
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0
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101
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102 header.nelts = 0;
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103 trailer.nelts = 0;
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104
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105 /* create the header iovec and coalesce the neighbouring bufs */
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106
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107 prev = NULL;
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108 iov = NULL;
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109
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672
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110 for (cl = in; cl && send < limit; cl = cl->next) {
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111
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0
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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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672
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130 if (header.nelts >= IOV_MAX){
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131 break;
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132 }
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133
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50
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134 iov = ngx_array_push(&header);
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135 if (iov == NULL) {
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0
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136 return NGX_CHAIN_ERROR;
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137 }
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138
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139 iov->iov_base = (void *) cl->buf->pos;
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22
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140 iov->iov_len = (size_t) size;
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0
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141 }
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142
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22
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143 prev = cl->buf->pos + (size_t) size;
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144 header_size += (size_t) size;
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0
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145 send += size;
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146 }
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147
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148
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149 if (cl && cl->buf->in_file && send < limit) {
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150 file = cl->buf;
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151
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152 /* coalesce the neighbouring file bufs */
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153
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154 do {
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22
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155 size = cl->buf->file_last - cl->buf->file_pos;
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0
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156
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157 if (send + size > limit) {
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158 size = limit - send;
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159
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160 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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298
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161 & ~((off_t) ngx_pagesize - 1);
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0
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162
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163 if (aligned <= cl->buf->file_last) {
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164 size = aligned - cl->buf->file_pos;
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165 }
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166 }
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167
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22
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168 file_size += (size_t) size;
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0
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169 send += size;
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170 fprev = cl->buf->file_pos + size;
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171 cl = cl->next;
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172
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173 } while (cl
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174 && cl->buf->in_file
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175 && send < limit
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176 && file->file->fd == cl->buf->file->fd
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177 && fprev == cl->buf->file_pos);
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178 }
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179
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4
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180
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0
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181 if (file) {
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4
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182
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664
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183 /* create the trailer iovec and coalesce the neighbouring bufs */
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0
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184
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185 prev = NULL;
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186 iov = NULL;
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187
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672
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188 while (cl && send < limit) {
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4
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189
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0
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190 if (ngx_buf_special(cl->buf)) {
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4
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191 cl = cl->next;
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0
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192 continue;
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193 }
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194
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195 if (!ngx_buf_in_memory_only(cl->buf)) {
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196 break;
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197 }
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198
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199 size = cl->buf->last - cl->buf->pos;
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200
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201 if (send + size > limit) {
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202 size = limit - send;
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203 }
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204
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205 if (prev == 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 } else {
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672
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209 if (trailer.nelts >= IOV_MAX){
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210 break;
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211 }
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212
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50
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213 iov = ngx_array_push(&trailer);
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214 if (iov == NULL) {
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0
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215 return NGX_CHAIN_ERROR;
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216 }
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217
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218 iov->iov_base = (void *) cl->buf->pos;
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22
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219 iov->iov_len = (size_t) size;
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0
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220 }
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221
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22
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222 prev = cl->buf->pos + (size_t) size;
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0
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223 send += size;
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4
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224 cl = cl->next;
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0
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225 }
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226 }
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227
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228 if (file) {
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229
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230 if (ngx_freebsd_use_tcp_nopush
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231 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
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232 {
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233 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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234 err = ngx_errno;
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235
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236 /*
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28
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237 * there is a tiny chance to be interrupted, however,
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0
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238 * we continue a processing without the TCP_NOPUSH
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239 */
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240
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241 if (err != NGX_EINTR) {
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242 wev->error = 1;
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86
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243 (void) ngx_connection_error(c, err,
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244 ngx_tcp_nopush_n " failed");
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0
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245 return NGX_CHAIN_ERROR;
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246 }
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247
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248 } else {
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249 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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250
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251 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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252 "tcp_nopush");
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253 }
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254 }
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255
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654
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256 /*
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257 * sendfile() does unneeded work if sf_hdtr's count is 0,
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258 * but corresponding pointer is not NULL
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259 */
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260
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261 hdtr.headers = header.nelts ? (struct iovec *) header.elts: NULL;
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0
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262 hdtr.hdr_cnt = header.nelts;
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654
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263 hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL;
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0
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264 hdtr.trl_cnt = trailer.nelts;
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265
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266 /*
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267 * the "nbytes bug" of the old sendfile() syscall:
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268 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
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269 */
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270
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28
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271 if (!ngx_freebsd_sendfile_nbytes_bug) {
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22
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272 header_size = 0;
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0
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273 }
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274
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275 sent = 0;
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276
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520
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277 #if (NGX_HAVE_AIO_SENDFILE)
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278 flags = c->aio_sendfile ? SF_NODISKIO : 0;
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279 #endif
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280
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0
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281 rc = sendfile(file->file->fd, c->fd, file->file_pos,
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520
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282 file_size + header_size, &hdtr, &sent, flags);
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0
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283
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284 if (rc == -1) {
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285 err = ngx_errno;
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286
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520
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287 switch (err) {
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288 case NGX_EAGAIN:
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289 eagain = 1;
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290 break;
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0
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291
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520
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292 case NGX_EINTR:
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293 eintr = 1;
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294 break;
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0
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295
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520
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296 #if (NGX_HAVE_AIO_SENDFILE)
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297 case NGX_EBUSY:
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298 c->busy_sendfile = file;
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299 break;
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300 #endif
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0
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301
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520
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302 default:
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0
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303 wev->error = 1;
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86
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304 (void) ngx_connection_error(c, err, "sendfile() failed");
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0
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305 return NGX_CHAIN_ERROR;
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306 }
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520
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307
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308 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
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309 "sendfile() sent only %O bytes", sent);
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0
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310
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32
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311 /*
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312 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
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313 * on success, although only 0 is documented
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314 */
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315
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524
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316 } else if (rc >= 0 && sent == 0) {
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4
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317
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318 /*
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32
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319 * if rc is OK and sent equal to zero, then someone
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320 * has truncated the file, so the offset became beyond
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321 * the end of the file
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4
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322 */
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323
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324 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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524
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325 "sendfile() reported that \"%s\" was truncated at %O",
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326 file->file->name.data, file->file_pos);
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4
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327
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328 return NGX_CHAIN_ERROR;
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329 }
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330
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0
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331 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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332 "sendfile: %d, @%O %O:%uz",
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22
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333 rc, file->file_pos, sent, file_size + header_size);
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0
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334
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|
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335 } else {
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336 rc = writev(c->fd, header.elts, header.nelts);
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337
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338 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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339 "writev: %d of %uz", rc, header_size);
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0
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340
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341 if (rc == -1) {
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342 err = ngx_errno;
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343
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520
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344 switch (err) {
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345 case NGX_EAGAIN:
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346 break;
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0
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347
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520
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348 case NGX_EINTR:
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349 eintr = 1;
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350 break;
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0
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351
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520
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352 default:
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0
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353 wev->error = 1;
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354 ngx_connection_error(c, err, "writev() failed");
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355 return NGX_CHAIN_ERROR;
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|
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356 }
|
|
520
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357
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|
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358 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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|
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359 "writev() not ready");
|
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0
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360 }
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361
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362 sent = rc > 0 ? rc : 0;
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363 }
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364
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|
22
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365 if (send - prev_send == sent) {
|
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0
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366 complete = 1;
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|
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367 }
|
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368
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369 c->sent += sent;
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370
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|
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371 for (cl = in; cl; cl = cl->next) {
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372
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|
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373 if (ngx_buf_special(cl->buf)) {
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374 continue;
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375 }
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376
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|
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377 if (sent == 0) {
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378 break;
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379 }
|
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380
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381 size = ngx_buf_size(cl->buf);
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382
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|
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383 if (sent >= size) {
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384 sent -= size;
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385
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|
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386 if (ngx_buf_in_memory(cl->buf)) {
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387 cl->buf->pos = cl->buf->last;
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388 }
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389
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|
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390 if (cl->buf->in_file) {
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391 cl->buf->file_pos = cl->buf->file_last;
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392 }
|
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393
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|
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394 continue;
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395 }
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396
|
|
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397 if (ngx_buf_in_memory(cl->buf)) {
|
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22
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398 cl->buf->pos += (size_t) sent;
|
|
0
|
399 }
|
|
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400
|
|
|
401 if (cl->buf->in_file) {
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402 cl->buf->file_pos += sent;
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403 }
|
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404
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|
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405 break;
|
|
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406 }
|
|
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407
|
|
520
|
408 #if (NGX_HAVE_AIO_SENDFILE)
|
|
|
409 if (c->busy_sendfile) {
|
|
|
410 return cl;
|
|
|
411 }
|
|
|
412 #endif
|
|
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413
|
|
0
|
414 if (eagain) {
|
|
|
415
|
|
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416 /*
|
|
28
|
417 * sendfile() may return EAGAIN, even if it has sent a whole file
|
|
|
418 * part, it indicates that the successive sendfile() call would
|
|
0
|
419 * return EAGAIN right away and would not send anything.
|
|
|
420 * We use it as a hint.
|
|
|
421 */
|
|
|
422
|
|
|
423 wev->ready = 0;
|
|
|
424 return cl;
|
|
|
425 }
|
|
|
426
|
|
|
427 if (eintr) {
|
|
|
428 continue;
|
|
|
429 }
|
|
|
430
|
|
|
431 if (!complete) {
|
|
|
432 wev->ready = 0;
|
|
|
433 return cl;
|
|
|
434 }
|
|
|
435
|
|
|
436 if (send >= limit || cl == NULL) {
|
|
|
437 return cl;
|
|
|
438 }
|
|
|
439
|
|
|
440 in = cl;
|
|
|
441 }
|
|
|
442 }
|
