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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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232
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19 * Linux 2.4.21 has the new sendfile64() syscall #239.
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20 *
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21 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter
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22 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL,
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23 * so we limit it to 2G-1 bytes.
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0
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24 */
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25
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232
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26 #define NGX_SENDFILE_LIMIT 2147483647L
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27
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0
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28
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146
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29 #if (IOV_MAX > 64)
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30 #define NGX_HEADERS 64
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31 #else
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32 #define NGX_HEADERS IOV_MAX
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33 #endif
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0
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34
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35
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134
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36 ngx_chain_t *
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37 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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38 {
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138
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39 int rc, tcp_nodelay;
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40 off_t size, send, prev_send, aligned, sent, fprev;
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41 u_char *prev;
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42 size_t file_size;
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43 ngx_err_t err;
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44 ngx_buf_t *file;
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45 ngx_uint_t eintr, complete;
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46 ngx_array_t header;
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47 ngx_event_t *wev;
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48 ngx_chain_t *cl;
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49 struct iovec *iov, headers[NGX_HEADERS];
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4
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50 #if (NGX_HAVE_SENDFILE64)
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138
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51 off_t offset;
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0
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52 #else
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138
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53 int32_t offset;
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0
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54 #endif
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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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22
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62
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232
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63 /* the maximum limit size is 2G-1 - the page size */
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22
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64
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324
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65 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_LIMIT - ngx_pagesize)) {
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232
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66 limit = NGX_SENDFILE_LIMIT - ngx_pagesize;
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22
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67 }
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68
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69
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0
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70 send = 0;
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71
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72 header.elts = headers;
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73 header.size = sizeof(struct iovec);
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74 header.nalloc = NGX_HEADERS;
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75 header.pool = c->pool;
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76
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77 for ( ;; ) {
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78 file = NULL;
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22
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79 file_size = 0;
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0
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80 eintr = 0;
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81 complete = 0;
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22
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82 prev_send = send;
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0
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83
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84 header.nelts = 0;
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85
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86 prev = NULL;
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87 iov = NULL;
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88
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89 /* create the iovec and coalesce the neighbouring bufs */
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90
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91 for (cl = in;
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92 cl && header.nelts < IOV_MAX && send < limit;
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93 cl = cl->next)
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94 {
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95 if (ngx_buf_special(cl->buf)) {
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96 continue;
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97 }
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98
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28
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99 #if 1
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100 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) {
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101 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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32
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102 "zero size buf in sendfile "
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103 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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104 cl->buf->temporary,
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105 cl->buf->recycled,
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106 cl->buf->in_file,
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107 cl->buf->start,
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108 cl->buf->pos,
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109 cl->buf->last,
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110 cl->buf->file,
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111 cl->buf->file_pos,
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112 cl->buf->file_last);
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113
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28
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114 ngx_debug_point();
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38
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115
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116 return NGX_CHAIN_ERROR;
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28
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117 }
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118 #endif
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119
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0
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120 if (!ngx_buf_in_memory_only(cl->buf)) {
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121 break;
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122 }
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123
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124 size = cl->buf->last - cl->buf->pos;
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125
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126 if (send + size > limit) {
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127 size = limit - send;
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128 }
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129
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130 if (prev == cl->buf->pos) {
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22
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131 iov->iov_len += (size_t) size;
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0
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132
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133 } else {
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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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143 prev = cl->buf->pos + (size_t) size;
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144 send += size;
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145 }
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146
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147 /* set TCP_CORK if there is a header before a file */
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148
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149 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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150 && header.nelts != 0
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151 && cl
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152 && cl->buf->in_file)
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153 {
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22
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154 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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155
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32
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156 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
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22
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157
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158 tcp_nodelay = 0;
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159
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160 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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161 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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162 {
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163 err = ngx_errno;
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0
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164
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22
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165 /*
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166 * there is a tiny chance to be interrupted, however,
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167 * we continue a processing with the TCP_NODELAY
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168 * and without the TCP_CORK
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169 */
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170
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126
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171 if (err != NGX_EINTR) {
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172 wev->error = 1;
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32
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173 ngx_connection_error(c, err,
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174 "setsockopt(TCP_NODELAY) failed");
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175 return NGX_CHAIN_ERROR;
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176 }
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177
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178 } else {
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179 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
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0
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180
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22
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181 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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182 "no tcp_nodelay");
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0
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183 }
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22
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184 }
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185
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32
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186 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
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22
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187
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188 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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189 err = ngx_errno;
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0
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190
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22
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191 /*
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192 * there is a tiny chance to be interrupted, however,
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22
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193 * we continue a processing without the TCP_CORK
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194 */
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195
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126
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196 if (err != NGX_EINTR) {
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22
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197 wev->error = 1;
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198 ngx_connection_error(c, err,
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199 ngx_tcp_nopush_n " failed");
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200 return NGX_CHAIN_ERROR;
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201 }
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202
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203 } else {
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204 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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126
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205
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206 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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207 "tcp_nopush");
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208 }
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0
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209 }
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210 }
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211
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212 /* get the file buf */
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213
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214 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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215 file = cl->buf;
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216
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217 /* coalesce the neighbouring file bufs */
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218
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219 do {
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22
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220 size = cl->buf->file_last - cl->buf->file_pos;
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0
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221
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222 if (send + size > limit) {
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223 size = limit - send;
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224
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225 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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298
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226 & ~((off_t) ngx_pagesize - 1);
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0
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227
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228 if (aligned <= cl->buf->file_last) {
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229 size = aligned - cl->buf->file_pos;
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230 }
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231 }
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232
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22
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233 file_size += (size_t) size;
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234 send += size;
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235 fprev = cl->buf->file_pos + size;
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236 cl = cl->next;
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237
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238 } while (cl
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239 && cl->buf->in_file
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240 && send < limit
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241 && file->file->fd == cl->buf->file->fd
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242 && fprev == cl->buf->file_pos);
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243 }
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244
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245 if (file) {
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138
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246 #if 1
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247 if (file_size == 0) {
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248 ngx_debug_point();
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249 return NGX_CHAIN_ERROR;
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250 }
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251 #endif
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4
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252 #if (NGX_HAVE_SENDFILE64)
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0
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253 offset = file->file_pos;
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254 #else
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255 offset = (int32_t) file->file_pos;
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256 #endif
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300
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257
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258 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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259 "sendfile: @%O %uz", file->file_pos, file_size);
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260
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261 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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0
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262
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263 if (rc == -1) {
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264 err = ngx_errno;
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265
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520
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266 switch (err) {
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267 case NGX_EAGAIN:
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268 break;
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0
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269
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520
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270 case NGX_EINTR:
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271 eintr = 1;
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272 break;
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0
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273
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520
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274 default:
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275 wev->error = 1;
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276 ngx_connection_error(c, err, "sendfile() failed");
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277 return NGX_CHAIN_ERROR;
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278 }
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520
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279
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280 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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281 "sendfile() is not ready");
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0
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282 }
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283
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284 sent = rc > 0 ? rc : 0;
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285
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286 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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287 "sendfile: %d, @%O %O:%uz",
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288 rc, file->file_pos, sent, file_size);
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0
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289
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290 } else {
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291 rc = writev(c->fd, header.elts, header.nelts);
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292
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293 if (rc == -1) {
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294 err = ngx_errno;
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295
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520
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296 switch (err) {
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297 case NGX_EAGAIN:
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298 break;
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0
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299
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520
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300 case NGX_EINTR:
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301 eintr = 1;
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302 break;
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0
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303
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520
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304 default:
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0
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305 wev->error = 1;
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306 ngx_connection_error(c, err, "writev() failed");
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126
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307 return NGX_CHAIN_ERROR;
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0
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308 }
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520
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309
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310 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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311 "writev() not ready");
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0
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312 }
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313
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314 sent = rc > 0 ? rc : 0;
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315
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22
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316 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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0
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317 }
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318
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22
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319 if (send - prev_send == sent) {
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0
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320 complete = 1;
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321 }
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322
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323 c->sent += sent;
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324
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325 for (cl = in; cl; cl = cl->next) {
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326
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327 if (ngx_buf_special(cl->buf)) {
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328 continue;
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329 }
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330
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331 if (sent == 0) {
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332 break;
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333 }
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334
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335 size = ngx_buf_size(cl->buf);
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336
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337 if (sent >= size) {
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338 sent -= size;
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339
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340 if (ngx_buf_in_memory(cl->buf)) {
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341 cl->buf->pos = cl->buf->last;
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342 }
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343
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344 if (cl->buf->in_file) {
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345 cl->buf->file_pos = cl->buf->file_last;
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346 }
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347
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348 continue;
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349 }
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350
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351 if (ngx_buf_in_memory(cl->buf)) {
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22
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352 cl->buf->pos += (size_t) sent;
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0
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353 }
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354
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355 if (cl->buf->in_file) {
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356 cl->buf->file_pos += sent;
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357 }
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358
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359 break;
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360 }
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361
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362 if (eintr) {
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126
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363 continue;
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0
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364 }
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365
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126
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366 if (!complete) {
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0
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367 wev->ready = 0;
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368 return cl;
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369 }
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370
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371 if (send >= limit || cl == NULL) {
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372 return cl;
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373 }
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374
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375 in = cl;
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376 }
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377 }
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