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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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14 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit
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28
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15 * offsets only, and the including <sys/sendfile.h> breaks the compiling,
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16 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset
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17 * parameter is int32_t, and use sendfile() for the file parts below 2G only,
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18 * see src/os/unix/ngx_linux_config.h
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0
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19 *
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232
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20 * Linux 2.4.21 has the new sendfile64() syscall #239.
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21 *
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22 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter
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23 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL,
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24 * so we limit it to 2G-1 bytes.
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0
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25 */
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26
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232
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27 #define NGX_SENDFILE_LIMIT 2147483647L
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28
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0
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29
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146
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30 #if (IOV_MAX > 64)
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31 #define NGX_HEADERS 64
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32 #else
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33 #define NGX_HEADERS IOV_MAX
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34 #endif
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0
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35
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36
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134
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37 ngx_chain_t *
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38 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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39 {
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138
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40 int rc, tcp_nodelay;
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41 off_t size, send, prev_send, aligned, sent, fprev;
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42 u_char *prev;
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43 size_t file_size;
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44 ngx_err_t err;
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45 ngx_buf_t *file;
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46 ngx_uint_t eintr, complete;
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47 ngx_array_t header;
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48 ngx_event_t *wev;
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49 ngx_chain_t *cl;
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50 struct iovec *iov, headers[NGX_HEADERS];
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4
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51 #if (NGX_HAVE_SENDFILE64)
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138
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52 off_t offset;
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0
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53 #else
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138
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54 int32_t offset;
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0
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55 #endif
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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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22
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63
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232
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64 /* the maximum limit size is 2G-1 - the page size */
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22
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65
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324
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66 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_LIMIT - ngx_pagesize)) {
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232
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67 limit = NGX_SENDFILE_LIMIT - ngx_pagesize;
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22
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68 }
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69
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70
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0
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71 send = 0;
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72
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73 header.elts = headers;
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74 header.size = sizeof(struct iovec);
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75 header.nalloc = NGX_HEADERS;
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76 header.pool = c->pool;
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77
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78 for ( ;; ) {
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79 file = NULL;
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22
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80 file_size = 0;
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0
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81 eintr = 0;
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82 complete = 0;
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22
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83 prev_send = send;
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0
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84
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85 header.nelts = 0;
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86
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87 prev = NULL;
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88 iov = NULL;
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89
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90 /* create the iovec and coalesce the neighbouring bufs */
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91
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92 for (cl = in;
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93 cl && header.nelts < IOV_MAX && send < limit;
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94 cl = cl->next)
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95 {
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96 if (ngx_buf_special(cl->buf)) {
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97 continue;
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98 }
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99
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28
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100 #if 1
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101 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) {
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102 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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32
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103 "zero size buf in sendfile "
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104 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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105 cl->buf->temporary,
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106 cl->buf->recycled,
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107 cl->buf->in_file,
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108 cl->buf->start,
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109 cl->buf->pos,
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110 cl->buf->last,
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111 cl->buf->file,
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112 cl->buf->file_pos,
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113 cl->buf->file_last);
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114
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28
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115 ngx_debug_point();
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38
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116
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117 return NGX_CHAIN_ERROR;
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28
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118 }
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119 #endif
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120
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0
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121 if (!ngx_buf_in_memory_only(cl->buf)) {
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122 break;
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123 }
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124
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125 size = cl->buf->last - cl->buf->pos;
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126
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127 if (send + size > limit) {
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128 size = limit - send;
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129 }
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130
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131 if (prev == cl->buf->pos) {
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22
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132 iov->iov_len += (size_t) size;
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0
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133
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134 } else {
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50
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135 iov = ngx_array_push(&header);
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136 if (iov == NULL) {
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0
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137 return NGX_CHAIN_ERROR;
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138 }
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139
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140 iov->iov_base = (void *) cl->buf->pos;
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22
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141 iov->iov_len = (size_t) size;
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0
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142 }
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143
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22
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144 prev = cl->buf->pos + (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 /* set TCP_CORK if there is a header before a file */
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149
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150 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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151 && header.nelts != 0
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152 && cl
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153 && cl->buf->in_file)
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154 {
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22
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155 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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156
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32
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157 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
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22
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158
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159 tcp_nodelay = 0;
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160
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161 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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162 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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163 {
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164 err = ngx_errno;
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0
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165
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22
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166 /*
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167 * there is a tiny chance to be interrupted, however,
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22
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168 * we continue a processing with the TCP_NODELAY
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169 * and without the TCP_CORK
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170 */
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171
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126
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172 if (err != NGX_EINTR) {
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22
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173 wev->error = 1;
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32
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174 ngx_connection_error(c, err,
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22
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175 "setsockopt(TCP_NODELAY) failed");
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176 return NGX_CHAIN_ERROR;
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177 }
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178
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179 } else {
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32
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180 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
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0
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181
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22
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182 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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183 "no tcp_nodelay");
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0
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184 }
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22
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185 }
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186
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32
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187 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
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22
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188
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189 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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190 err = ngx_errno;
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0
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191
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22
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192 /*
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193 * there is a tiny chance to be interrupted, however,
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22
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194 * we continue a processing without the TCP_CORK
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195 */
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0
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196
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126
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197 if (err != NGX_EINTR) {
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22
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198 wev->error = 1;
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199 ngx_connection_error(c, err,
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200 ngx_tcp_nopush_n " failed");
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201 return NGX_CHAIN_ERROR;
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202 }
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203
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204 } else {
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205 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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126
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206
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22
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207 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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208 "tcp_nopush");
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209 }
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0
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210 }
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211 }
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212
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213 /* get the file buf */
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214
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215 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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216 file = cl->buf;
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217
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218 /* coalesce the neighbouring file bufs */
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219
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220 do {
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22
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221 size = cl->buf->file_last - cl->buf->file_pos;
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0
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222
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223 if (send + size > limit) {
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224 size = limit - send;
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225
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226 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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298
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227 & ~((off_t) ngx_pagesize - 1);
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0
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228
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229 if (aligned <= cl->buf->file_last) {
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230 size = aligned - cl->buf->file_pos;
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231 }
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232 }
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233
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22
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234 file_size += (size_t) size;
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0
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235 send += size;
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236 fprev = cl->buf->file_pos + size;
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237 cl = cl->next;
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238
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239 } while (cl
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240 && cl->buf->in_file
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241 && send < limit
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242 && file->file->fd == cl->buf->file->fd
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243 && fprev == cl->buf->file_pos);
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244 }
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245
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246 if (file) {
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138
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247 #if 1
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248 if (file_size == 0) {
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249 ngx_debug_point();
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250 return NGX_CHAIN_ERROR;
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251 }
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252 #endif
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4
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253 #if (NGX_HAVE_SENDFILE64)
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0
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254 offset = file->file_pos;
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255 #else
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256 offset = (int32_t) file->file_pos;
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257 #endif
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300
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258
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259 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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260 "sendfile: @%O %uz", file->file_pos, file_size);
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261
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22
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262 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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0
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263
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264 if (rc == -1) {
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265 err = ngx_errno;
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266
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520
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267 switch (err) {
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268 case NGX_EAGAIN:
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269 break;
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0
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270
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520
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271 case NGX_EINTR:
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272 eintr = 1;
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273 break;
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0
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274
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520
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275 default:
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0
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276 wev->error = 1;
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277 ngx_connection_error(c, err, "sendfile() failed");
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278 return NGX_CHAIN_ERROR;
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279 }
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520
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280
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281 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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282 "sendfile() is not ready");
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0
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283 }
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284
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285 sent = rc > 0 ? rc : 0;
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286
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287 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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288 "sendfile: %d, @%O %O:%uz",
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289 rc, file->file_pos, sent, file_size);
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0
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290
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291 } else {
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292 rc = writev(c->fd, header.elts, header.nelts);
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293
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294 if (rc == -1) {
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295 err = ngx_errno;
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296
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520
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297 switch (err) {
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298 case NGX_EAGAIN:
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299 break;
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0
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300
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520
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301 case NGX_EINTR:
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302 eintr = 1;
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303 break;
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0
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304
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520
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305 default:
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0
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306 wev->error = 1;
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307 ngx_connection_error(c, err, "writev() failed");
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126
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308 return NGX_CHAIN_ERROR;
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0
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309 }
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520
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310
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311 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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312 "writev() not ready");
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0
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313 }
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314
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315 sent = rc > 0 ? rc : 0;
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316
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22
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317 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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0
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318 }
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319
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22
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320 if (send - prev_send == sent) {
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0
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321 complete = 1;
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322 }
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323
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324 c->sent += sent;
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325
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326 for (cl = in; cl; cl = cl->next) {
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327
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328 if (ngx_buf_special(cl->buf)) {
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329 continue;
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330 }
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331
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332 if (sent == 0) {
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333 break;
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334 }
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335
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336 size = ngx_buf_size(cl->buf);
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337
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338 if (sent >= size) {
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339 sent -= size;
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340
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341 if (ngx_buf_in_memory(cl->buf)) {
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342 cl->buf->pos = cl->buf->last;
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343 }
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344
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345 if (cl->buf->in_file) {
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346 cl->buf->file_pos = cl->buf->file_last;
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347 }
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348
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349 continue;
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350 }
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351
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352 if (ngx_buf_in_memory(cl->buf)) {
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22
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353 cl->buf->pos += (size_t) sent;
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0
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354 }
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355
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356 if (cl->buf->in_file) {
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357 cl->buf->file_pos += sent;
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358 }
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359
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360 break;
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361 }
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362
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363 if (eintr) {
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126
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364 continue;
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0
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365 }
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366
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126
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367 if (!complete) {
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0
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368 wev->ready = 0;
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369 return cl;
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370 }
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371
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372 if (send >= limit || cl == NULL) {
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373 return cl;
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374 }
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375
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376 in = cl;
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377 }
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378 }
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