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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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146
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12 #if (IOV_MAX > 64)
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13 #define NGX_IOVS 64
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14 #else
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15 #define NGX_IOVS IOV_MAX
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16 #endif
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0
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17
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18
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50
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19 ngx_chain_t *
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20 ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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21 {
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22 u_char *prev;
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10
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23 ssize_t n, size, sent;
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22
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24 off_t send, prev_send;
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0
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25 ngx_uint_t eintr, complete;
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26 ngx_err_t err;
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27 ngx_array_t vec;
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28 ngx_chain_t *cl;
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29 ngx_event_t *wev;
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30 struct iovec *iov, iovs[NGX_IOVS];
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31
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32 wev = c->write;
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33
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34 if (!wev->ready) {
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35 return in;
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36 }
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37
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18
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38 #if (NGX_HAVE_KQUEUE)
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0
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39
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136
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40 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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41 (void) ngx_connection_error(c, wev->kq_errno,
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42 "kevent() reported about an closed connection");
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0
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43 wev->error = 1;
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44 return NGX_CHAIN_ERROR;
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45 }
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46
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47 #endif
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48
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22
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49 /* the maximum limit size is the maximum size_t value - the page size */
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50
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324
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51 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
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26
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52 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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53 }
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54
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0
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55 send = 0;
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56 complete = 0;
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57
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58 vec.elts = iovs;
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59 vec.size = sizeof(struct iovec);
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60 vec.nalloc = NGX_IOVS;
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61 vec.pool = c->pool;
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62
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63 for ( ;; ) {
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64 prev = NULL;
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65 iov = NULL;
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66 eintr = 0;
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22
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67 prev_send = send;
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0
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68
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69 vec.nelts = 0;
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70
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71 /* create the iovec and coalesce the neighbouring bufs */
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72
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73 for (cl = in; cl && vec.nelts < IOV_MAX && send < limit; cl = cl->next)
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74 {
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75 if (ngx_buf_special(cl->buf)) {
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76 continue;
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77 }
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78
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10
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79 #if 1
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80 if (!ngx_buf_in_memory(cl->buf)) {
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81 ngx_debug_point();
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82 }
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83 #endif
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84
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0
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85 size = cl->buf->last - cl->buf->pos;
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86
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87 if (send + size > limit) {
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110
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88 size = (ssize_t) (limit - send);
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0
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89 }
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90
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91 if (prev == cl->buf->pos) {
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92 iov->iov_len += size;
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93
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94 } else {
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50
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95 iov = ngx_array_push(&vec);
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96 if (iov == NULL) {
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0
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97 return NGX_CHAIN_ERROR;
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98 }
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99
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100 iov->iov_base = (void *) cl->buf->pos;
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101 iov->iov_len = size;
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102 }
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103
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104 prev = cl->buf->pos + size;
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105 send += size;
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106 }
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107
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108 n = writev(c->fd, vec.elts, vec.nelts);
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109
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110 if (n == -1) {
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111 err = ngx_errno;
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112
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520
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113 switch (err) {
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114 case NGX_EAGAIN:
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115 break;
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0
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116
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520
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117 case NGX_EINTR:
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118 eintr = 1;
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119 break;
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0
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120
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520
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121 default:
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0
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122 wev->error = 1;
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86
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123 (void) ngx_connection_error(c, err, "writev() failed");
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0
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124 return NGX_CHAIN_ERROR;
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125 }
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520
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126
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127 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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128 "writev() not ready");
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0
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129 }
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130
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131 sent = n > 0 ? n : 0;
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132
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10
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133 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %z", sent);
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0
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134
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22
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135 if (send - prev_send == sent) {
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0
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136 complete = 1;
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137 }
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138
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139 c->sent += sent;
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140
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10
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141 for (cl = in; cl; cl = cl->next) {
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142
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0
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143 if (ngx_buf_special(cl->buf)) {
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144 continue;
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145 }
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146
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147 if (sent == 0) {
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148 break;
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149 }
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150
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151 size = cl->buf->last - cl->buf->pos;
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152
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153 if (sent >= size) {
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154 sent -= size;
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155 cl->buf->pos = cl->buf->last;
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156
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157 continue;
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158 }
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159
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160 cl->buf->pos += sent;
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161
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162 break;
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163 }
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164
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165 if (eintr) {
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166 continue;
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167 }
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168
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169 if (!complete) {
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170 wev->ready = 0;
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171 return cl;
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172 }
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173
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174 if (send >= limit || cl == NULL) {
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175 return cl;
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176 }
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177
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178 in = cl;
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179 }
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180 }
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