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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 /*
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13 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit
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28
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14 * offsets only, and the including <sys/sendfile.h> breaks the compiling,
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15 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset
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16 * parameter is int32_t, and use sendfile() for the file parts below 2G only,
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17 * see src/os/unix/ngx_linux_config.h
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0
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18 *
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19 * Linux 2.4.21 has a new sendfile64() syscall #239.
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20 */
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21
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22
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146
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23 #if (IOV_MAX > 64)
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24 #define NGX_HEADERS 64
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25 #else
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26 #define NGX_HEADERS IOV_MAX
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27 #endif
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0
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28
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29
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134
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30 ngx_chain_t *
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31 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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32 {
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138
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33 int rc, tcp_nodelay;
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34 off_t size, send, prev_send, aligned, sent, fprev;
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35 u_char *prev;
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36 size_t file_size;
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37 ngx_err_t err;
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38 ngx_buf_t *file;
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39 ngx_uint_t eintr, complete;
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40 ngx_array_t header;
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41 ngx_event_t *wev;
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42 ngx_chain_t *cl;
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43 struct iovec *iov, headers[NGX_HEADERS];
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4
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44 #if (NGX_HAVE_SENDFILE64)
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138
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45 off_t offset;
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0
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46 #else
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138
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47 int32_t offset;
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0
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48 #endif
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49
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50 wev = c->write;
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51
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52 if (!wev->ready) {
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53 return in;
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54 }
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55
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22
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56
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57 /* the maximum limit size is the maximum size_t value - the page size */
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58
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26
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59 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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60 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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61 }
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62
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63
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64 send = 0;
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65
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66 header.elts = headers;
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67 header.size = sizeof(struct iovec);
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68 header.nalloc = NGX_HEADERS;
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69 header.pool = c->pool;
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70
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71 for ( ;; ) {
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72 file = NULL;
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22
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73 file_size = 0;
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0
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74 eintr = 0;
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75 complete = 0;
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22
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76 prev_send = send;
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0
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77
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78 header.nelts = 0;
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79
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80 prev = NULL;
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81 iov = NULL;
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82
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83 /* create the iovec and coalesce the neighbouring bufs */
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84
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85 for (cl = in;
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86 cl && header.nelts < IOV_MAX && send < limit;
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87 cl = cl->next)
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88 {
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89 if (ngx_buf_special(cl->buf)) {
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90 continue;
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91 }
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92
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28
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93 #if 1
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94 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) {
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95 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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32
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96 "zero size buf in sendfile "
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97 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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98 cl->buf->temporary,
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99 cl->buf->recycled,
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100 cl->buf->in_file,
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101 cl->buf->start,
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102 cl->buf->pos,
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103 cl->buf->last,
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104 cl->buf->file,
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105 cl->buf->file_pos,
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106 cl->buf->file_last);
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107
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108 ngx_debug_point();
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38
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109
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110 return NGX_CHAIN_ERROR;
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28
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111 }
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112 #endif
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113
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0
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114 if (!ngx_buf_in_memory_only(cl->buf)) {
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115 break;
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116 }
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117
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118 size = cl->buf->last - cl->buf->pos;
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119
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120 if (send + size > limit) {
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121 size = limit - send;
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122 }
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123
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124 if (prev == cl->buf->pos) {
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22
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125 iov->iov_len += (size_t) size;
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0
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126
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127 } else {
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50
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128 iov = ngx_array_push(&header);
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129 if (iov == NULL) {
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130 return NGX_CHAIN_ERROR;
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131 }
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132
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133 iov->iov_base = (void *) cl->buf->pos;
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134 iov->iov_len = (size_t) size;
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0
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135 }
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136
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137 prev = cl->buf->pos + (size_t) size;
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138 send += size;
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139 }
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140
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141 /* set TCP_CORK if there is a header before a file */
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142
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143 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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144 && header.nelts != 0
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145 && cl
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146 && cl->buf->in_file)
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147 {
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22
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148 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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149
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32
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150 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
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151
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152 tcp_nodelay = 0;
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153
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154 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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155 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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156 {
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157 err = ngx_errno;
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0
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158
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159 /*
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160 * there is a tiny chance to be interrupted, however,
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161 * we continue a processing with the TCP_NODELAY
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162 * and without the TCP_CORK
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163 */
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164
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126
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165 if (err != NGX_EINTR) {
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166 wev->error = 1;
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167 ngx_connection_error(c, err,
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168 "setsockopt(TCP_NODELAY) failed");
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169 return NGX_CHAIN_ERROR;
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170 }
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171
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172 } else {
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173 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
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0
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174
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175 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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176 "no tcp_nodelay");
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0
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177 }
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178 }
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179
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180 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
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22
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181
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182 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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183 err = ngx_errno;
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0
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184
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185 /*
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186 * there is a tiny chance to be interrupted, however,
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187 * we continue a processing without the TCP_CORK
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188 */
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189
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126
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190 if (err != NGX_EINTR) {
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191 wev->error = 1;
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192 ngx_connection_error(c, err,
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193 ngx_tcp_nopush_n " failed");
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194 return NGX_CHAIN_ERROR;
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195 }
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196
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197 } else {
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198 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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199
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200 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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201 "tcp_nopush");
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202 }
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0
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203 }
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204 }
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205
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206 /* get the file buf */
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207
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208 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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209 file = cl->buf;
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210
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211 /* coalesce the neighbouring file bufs */
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212
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213 do {
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22
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214 size = cl->buf->file_last - cl->buf->file_pos;
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0
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215
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216 if (send + size > limit) {
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217 size = limit - send;
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218
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219 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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220 & ~(ngx_pagesize - 1);
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221
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222 if (aligned <= cl->buf->file_last) {
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223 size = aligned - cl->buf->file_pos;
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224 }
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225 }
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226
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227 file_size += (size_t) size;
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228 send += size;
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229 fprev = cl->buf->file_pos + size;
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230 cl = cl->next;
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231
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232 } while (cl
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233 && cl->buf->in_file
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234 && send < limit
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235 && file->file->fd == cl->buf->file->fd
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236 && fprev == cl->buf->file_pos);
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237 }
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238
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239 if (file) {
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138
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240 #if 1
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241 if (file_size == 0) {
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242 ngx_debug_point();
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243 return NGX_CHAIN_ERROR;
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244 }
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245 #endif
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4
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246 #if (NGX_HAVE_SENDFILE64)
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247 offset = file->file_pos;
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248 #else
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249 offset = (int32_t) file->file_pos;
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250 #endif
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251 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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252
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253 if (rc == -1) {
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254 err = ngx_errno;
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255
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256 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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257 if (err == NGX_EINTR) {
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258 eintr = 1;
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259 }
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260
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261 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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262 "sendfile() is not ready");
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263
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264 } else {
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265 wev->error = 1;
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266 ngx_connection_error(c, err, "sendfile() failed");
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267 return NGX_CHAIN_ERROR;
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268 }
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269 }
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270
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271 sent = rc > 0 ? rc : 0;
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272
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273 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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274 "sendfile: %d, @%O %O:%uz",
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275 rc, file->file_pos, sent, file_size);
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0
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276
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277 } else {
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278 rc = writev(c->fd, header.elts, header.nelts);
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279
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280 if (rc == -1) {
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281 err = ngx_errno;
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282
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283 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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284 if (err == NGX_EINTR) {
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285 eintr = 1;
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286 }
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287
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288 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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289 "writev() not ready");
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290
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291 } else {
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292 wev->error = 1;
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293 ngx_connection_error(c, err, "writev() failed");
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294 return NGX_CHAIN_ERROR;
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0
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295 }
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296 }
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297
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298 sent = rc > 0 ? rc : 0;
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299
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300 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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0
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301 }
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302
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303 if (send - prev_send == sent) {
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304 complete = 1;
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305 }
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306
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307 c->sent += sent;
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308
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309 for (cl = in; cl; cl = cl->next) {
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310
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311 if (ngx_buf_special(cl->buf)) {
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312 continue;
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313 }
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314
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315 if (sent == 0) {
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316 break;
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317 }
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318
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319 size = ngx_buf_size(cl->buf);
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320
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321 if (sent >= size) {
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322 sent -= size;
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323
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324 if (ngx_buf_in_memory(cl->buf)) {
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325 cl->buf->pos = cl->buf->last;
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326 }
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327
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328 if (cl->buf->in_file) {
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329 cl->buf->file_pos = cl->buf->file_last;
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330 }
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331
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332 continue;
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333 }
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334
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335 if (ngx_buf_in_memory(cl->buf)) {
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22
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336 cl->buf->pos += (size_t) sent;
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0
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337 }
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338
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339 if (cl->buf->in_file) {
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340 cl->buf->file_pos += sent;
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341 }
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342
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343 break;
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344 }
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345
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346 if (eintr) {
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126
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347 continue;
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0
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348 }
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349
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126
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350 if (!complete) {
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0
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351 wev->ready = 0;
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352 return cl;
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353 }
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354
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355 if (send >= limit || cl == NULL) {
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356 return cl;
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357 }
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358
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359 in = cl;
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360 }
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361 }
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