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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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672
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92 for (cl = in; cl && send < limit; cl = cl->next) {
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93
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0
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94 if (ngx_buf_special(cl->buf)) {
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95 continue;
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96 }
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97
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28
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98 #if 1
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99 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) {
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100 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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32
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101 "zero size buf in sendfile "
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102 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
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103 cl->buf->temporary,
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104 cl->buf->recycled,
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105 cl->buf->in_file,
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106 cl->buf->start,
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107 cl->buf->pos,
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108 cl->buf->last,
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109 cl->buf->file,
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110 cl->buf->file_pos,
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111 cl->buf->file_last);
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112
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28
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113 ngx_debug_point();
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38
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114
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115 return NGX_CHAIN_ERROR;
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28
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116 }
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117 #endif
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118
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0
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119 if (!ngx_buf_in_memory_only(cl->buf)) {
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120 break;
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121 }
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122
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123 size = cl->buf->last - cl->buf->pos;
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124
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125 if (send + size > limit) {
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126 size = limit - send;
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127 }
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128
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129 if (prev == cl->buf->pos) {
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22
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130 iov->iov_len += (size_t) size;
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0
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131
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132 } else {
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672
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133 if (header.nelts >= IOV_MAX) {
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134 break;
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135 }
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136
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50
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137 iov = ngx_array_push(&header);
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138 if (iov == NULL) {
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0
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139 return NGX_CHAIN_ERROR;
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140 }
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141
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142 iov->iov_base = (void *) cl->buf->pos;
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22
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143 iov->iov_len = (size_t) size;
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0
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144 }
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145
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22
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146 prev = cl->buf->pos + (size_t) size;
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0
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147 send += size;
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148 }
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149
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150 /* set TCP_CORK if there is a header before a file */
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151
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152 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET
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153 && header.nelts != 0
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154 && cl
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155 && cl->buf->in_file)
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156 {
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22
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157 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */
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158
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32
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159 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) {
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22
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160
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161 tcp_nodelay = 0;
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162
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163 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
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164 (const void *) &tcp_nodelay, sizeof(int)) == -1)
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165 {
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166 err = ngx_errno;
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0
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167
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22
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168 /*
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169 * there is a tiny chance to be interrupted, however,
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22
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170 * we continue a processing with the TCP_NODELAY
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171 * and without the TCP_CORK
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172 */
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173
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126
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174 if (err != NGX_EINTR) {
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22
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175 wev->error = 1;
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32
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176 ngx_connection_error(c, err,
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22
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177 "setsockopt(TCP_NODELAY) failed");
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178 return NGX_CHAIN_ERROR;
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179 }
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180
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181 } else {
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32
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182 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET;
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0
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183
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22
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184 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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185 "no tcp_nodelay");
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0
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186 }
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22
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187 }
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188
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32
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189 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) {
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22
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190
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191 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
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192 err = ngx_errno;
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0
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193
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22
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194 /*
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28
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195 * there is a tiny chance to be interrupted, however,
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22
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196 * we continue a processing without the TCP_CORK
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197 */
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0
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198
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126
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199 if (err != NGX_EINTR) {
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22
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200 wev->error = 1;
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201 ngx_connection_error(c, err,
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202 ngx_tcp_nopush_n " failed");
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203 return NGX_CHAIN_ERROR;
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204 }
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205
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206 } else {
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207 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
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126
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208
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22
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209 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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210 "tcp_nopush");
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211 }
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0
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212 }
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213 }
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214
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215 /* get the file buf */
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216
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217 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) {
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218 file = cl->buf;
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219
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220 /* coalesce the neighbouring file bufs */
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221
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222 do {
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22
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223 size = cl->buf->file_last - cl->buf->file_pos;
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0
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224
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225 if (send + size > limit) {
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226 size = limit - send;
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227
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228 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
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298
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229 & ~((off_t) ngx_pagesize - 1);
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0
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230
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231 if (aligned <= cl->buf->file_last) {
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232 size = aligned - cl->buf->file_pos;
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233 }
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234 }
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235
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22
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236 file_size += (size_t) size;
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0
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237 send += size;
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238 fprev = cl->buf->file_pos + size;
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239 cl = cl->next;
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240
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241 } while (cl
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242 && cl->buf->in_file
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243 && send < limit
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244 && file->file->fd == cl->buf->file->fd
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245 && fprev == cl->buf->file_pos);
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246 }
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247
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248 if (file) {
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138
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249 #if 1
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250 if (file_size == 0) {
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251 ngx_debug_point();
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252 return NGX_CHAIN_ERROR;
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253 }
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254 #endif
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4
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255 #if (NGX_HAVE_SENDFILE64)
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0
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256 offset = file->file_pos;
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257 #else
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258 offset = (int32_t) file->file_pos;
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259 #endif
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300
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260
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261 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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262 "sendfile: @%O %uz", file->file_pos, file_size);
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263
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22
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264 rc = sendfile(c->fd, file->file->fd, &offset, file_size);
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0
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265
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266 if (rc == -1) {
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267 err = ngx_errno;
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268
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520
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269 switch (err) {
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270 case NGX_EAGAIN:
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271 break;
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0
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272
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520
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273 case NGX_EINTR:
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274 eintr = 1;
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275 break;
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0
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276
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520
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277 default:
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0
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278 wev->error = 1;
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279 ngx_connection_error(c, err, "sendfile() failed");
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280 return NGX_CHAIN_ERROR;
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281 }
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520
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282
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283 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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284 "sendfile() is not ready");
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0
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285 }
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286
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287 sent = rc > 0 ? rc : 0;
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288
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289 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
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22
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290 "sendfile: %d, @%O %O:%uz",
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291 rc, file->file_pos, sent, file_size);
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0
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292
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293 } else {
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294 rc = writev(c->fd, header.elts, header.nelts);
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295
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296 if (rc == -1) {
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297 err = ngx_errno;
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298
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520
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299 switch (err) {
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300 case NGX_EAGAIN:
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301 break;
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0
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302
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520
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303 case NGX_EINTR:
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304 eintr = 1;
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305 break;
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0
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306
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520
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307 default:
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0
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308 wev->error = 1;
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309 ngx_connection_error(c, err, "writev() failed");
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126
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310 return NGX_CHAIN_ERROR;
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0
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311 }
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520
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312
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313 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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314 "writev() not ready");
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0
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315 }
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316
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317 sent = rc > 0 ? rc : 0;
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318
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22
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319 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent);
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0
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320 }
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321
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22
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322 if (send - prev_send == sent) {
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0
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323 complete = 1;
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324 }
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325
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326 c->sent += sent;
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327
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328 for (cl = in; cl; cl = cl->next) {
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329
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330 if (ngx_buf_special(cl->buf)) {
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331 continue;
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332 }
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333
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334 if (sent == 0) {
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335 break;
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336 }
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337
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338 size = ngx_buf_size(cl->buf);
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339
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340 if (sent >= size) {
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341 sent -= size;
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342
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343 if (ngx_buf_in_memory(cl->buf)) {
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344 cl->buf->pos = cl->buf->last;
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345 }
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346
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347 if (cl->buf->in_file) {
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348 cl->buf->file_pos = cl->buf->file_last;
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349 }
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350
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351 continue;
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352 }
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353
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354 if (ngx_buf_in_memory(cl->buf)) {
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22
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355 cl->buf->pos += (size_t) sent;
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0
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356 }
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357
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358 if (cl->buf->in_file) {
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359 cl->buf->file_pos += sent;
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360 }
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361
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362 break;
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363 }
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364
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365 if (eintr) {
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126
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366 continue;
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0
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367 }
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368
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126
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369 if (!complete) {
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0
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370 wev->ready = 0;
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371 return cl;
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372 }
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373
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374 if (send >= limit || cl == NULL) {
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375 return cl;
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376 }
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377
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378 in = cl;
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379 }
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380 }
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