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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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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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10
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12 #define NGX_IOVS 16
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0
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13
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14
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50
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15 ngx_chain_t *
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16 ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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17 {
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18 u_char *prev;
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10
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19 ssize_t n, size, sent;
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22
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20 off_t send, prev_send;
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0
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21 ngx_uint_t eintr, complete;
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22 ngx_err_t err;
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23 ngx_array_t vec;
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24 ngx_chain_t *cl;
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25 ngx_event_t *wev;
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26 struct iovec *iov, iovs[NGX_IOVS];
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27
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28 wev = c->write;
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29
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30 if (!wev->ready) {
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31 return in;
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32 }
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33
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18
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34 #if (NGX_HAVE_KQUEUE)
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0
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35
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4
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36 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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37 (void) ngx_connection_error(c, wev->kq_errno,
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38 "kevent() reported about an closed connection");
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0
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39 wev->error = 1;
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40 return NGX_CHAIN_ERROR;
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41 }
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42
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43 #endif
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44
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22
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45 /* the maximum limit size is the maximum size_t value - the page size */
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46
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26
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47 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
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48 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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49 }
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50
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0
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51 send = 0;
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52 complete = 0;
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53
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54 vec.elts = iovs;
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55 vec.size = sizeof(struct iovec);
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56 vec.nalloc = NGX_IOVS;
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57 vec.pool = c->pool;
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58
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59 for ( ;; ) {
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60 prev = NULL;
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61 iov = NULL;
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62 eintr = 0;
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22
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63 prev_send = send;
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0
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64
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65 vec.nelts = 0;
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66
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67 /* create the iovec and coalesce the neighbouring bufs */
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68
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69 for (cl = in; cl && vec.nelts < IOV_MAX && send < limit; cl = cl->next)
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70 {
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71 if (ngx_buf_special(cl->buf)) {
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72 continue;
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73 }
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74
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10
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75 #if 1
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76 if (!ngx_buf_in_memory(cl->buf)) {
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77 ngx_debug_point();
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78 }
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79 #endif
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80
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0
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81 size = cl->buf->last - cl->buf->pos;
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82
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83 if (send + size > limit) {
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104
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84 size = (ssize_t) limit - send;
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0
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85 }
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86
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87 if (prev == cl->buf->pos) {
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88 iov->iov_len += size;
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89
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90 } else {
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50
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91 iov = ngx_array_push(&vec);
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92 if (iov == NULL) {
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0
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93 return NGX_CHAIN_ERROR;
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94 }
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95
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96 iov->iov_base = (void *) cl->buf->pos;
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97 iov->iov_len = size;
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98 }
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99
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100 prev = cl->buf->pos + size;
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101 send += size;
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102 }
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103
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104 n = writev(c->fd, vec.elts, vec.nelts);
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105
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106 if (n == -1) {
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107 err = ngx_errno;
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108
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109 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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110 if (err == NGX_EINTR) {
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111 eintr = 1;
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112 }
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113
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114 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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115 "writev() not ready");
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116
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117 } else {
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118 wev->error = 1;
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86
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119 (void) ngx_connection_error(c, err, "writev() failed");
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0
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120 return NGX_CHAIN_ERROR;
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121 }
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122 }
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123
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124 sent = n > 0 ? n : 0;
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125
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10
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126 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %z", sent);
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0
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127
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22
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128 if (send - prev_send == sent) {
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0
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129 complete = 1;
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130 }
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131
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132 c->sent += sent;
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133
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10
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134 for (cl = in; cl; cl = cl->next) {
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135
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0
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136 if (ngx_buf_special(cl->buf)) {
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137 continue;
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138 }
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139
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140 if (sent == 0) {
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141 break;
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142 }
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143
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144 size = cl->buf->last - cl->buf->pos;
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145
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146 if (sent >= size) {
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147 sent -= size;
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148 cl->buf->pos = cl->buf->last;
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149
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150 continue;
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151 }
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152
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153 cl->buf->pos += sent;
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154
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155 break;
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156 }
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157
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158 if (eintr) {
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159 continue;
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160 }
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161
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162 if (!complete) {
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163 wev->ready = 0;
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164 return cl;
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165 }
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166
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167 if (send >= limit || cl == NULL) {
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168 return cl;
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169 }
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170
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171 in = cl;
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172 }
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173 }
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