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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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146
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13 #if (IOV_MAX > 64)
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14 #define NGX_IOVS 64
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15 #else
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16 #define NGX_IOVS IOV_MAX
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17 #endif
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0
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18
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19
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50
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20 ngx_chain_t *
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21 ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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22 {
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23 u_char *prev;
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10
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24 ssize_t n, size, sent;
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22
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25 off_t send, prev_send;
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0
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26 ngx_uint_t eintr, complete;
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27 ngx_err_t err;
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28 ngx_array_t vec;
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29 ngx_chain_t *cl;
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30 ngx_event_t *wev;
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31 struct iovec *iov, iovs[NGX_IOVS];
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32
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33 wev = c->write;
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34
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35 if (!wev->ready) {
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36 return in;
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37 }
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38
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18
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39 #if (NGX_HAVE_KQUEUE)
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0
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40
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136
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41 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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86
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42 (void) ngx_connection_error(c, wev->kq_errno,
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43 "kevent() reported about an closed connection");
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0
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44 wev->error = 1;
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45 return NGX_CHAIN_ERROR;
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46 }
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47
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48 #endif
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49
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22
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50 /* the maximum limit size is the maximum size_t value - the page size */
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51
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324
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52 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
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26
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53 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
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22
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54 }
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55
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0
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56 send = 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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672
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67 complete = 0;
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22
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68 prev_send = send;
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0
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69
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70 vec.nelts = 0;
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71
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72 /* create the iovec and coalesce the neighbouring bufs */
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73
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672
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74 for (cl = in; cl && send < limit; cl = cl->next) {
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75
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0
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76 if (ngx_buf_special(cl->buf)) {
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77 continue;
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78 }
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79
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10
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80 #if 1
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81 if (!ngx_buf_in_memory(cl->buf)) {
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82 ngx_debug_point();
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83 }
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84 #endif
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85
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0
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86 size = cl->buf->last - cl->buf->pos;
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87
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88 if (send + size > limit) {
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110
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89 size = (ssize_t) (limit - send);
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0
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90 }
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91
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92 if (prev == cl->buf->pos) {
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93 iov->iov_len += size;
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94
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95 } else {
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672
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96 if (vec.nelts >= IOV_MAX) {
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97 break;
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98 }
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99
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50
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100 iov = ngx_array_push(&vec);
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101 if (iov == NULL) {
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0
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102 return NGX_CHAIN_ERROR;
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103 }
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104
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105 iov->iov_base = (void *) cl->buf->pos;
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106 iov->iov_len = size;
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107 }
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108
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109 prev = cl->buf->pos + size;
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110 send += size;
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111 }
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112
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113 n = writev(c->fd, vec.elts, vec.nelts);
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114
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115 if (n == -1) {
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116 err = ngx_errno;
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117
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520
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118 switch (err) {
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119 case NGX_EAGAIN:
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120 break;
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0
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121
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520
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122 case NGX_EINTR:
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123 eintr = 1;
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124 break;
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0
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125
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520
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126 default:
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0
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127 wev->error = 1;
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86
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128 (void) ngx_connection_error(c, err, "writev() failed");
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0
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129 return NGX_CHAIN_ERROR;
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130 }
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520
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131
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132 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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133 "writev() not ready");
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0
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134 }
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135
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136 sent = n > 0 ? n : 0;
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137
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10
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138 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %z", sent);
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0
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139
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22
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140 if (send - prev_send == sent) {
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0
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141 complete = 1;
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142 }
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143
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144 c->sent += sent;
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145
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10
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146 for (cl = in; cl; cl = cl->next) {
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147
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0
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148 if (ngx_buf_special(cl->buf)) {
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149 continue;
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150 }
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151
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152 if (sent == 0) {
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153 break;
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154 }
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155
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156 size = cl->buf->last - cl->buf->pos;
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157
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158 if (sent >= size) {
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159 sent -= size;
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160 cl->buf->pos = cl->buf->last;
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161
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162 continue;
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163 }
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164
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165 cl->buf->pos += sent;
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166
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167 break;
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168 }
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169
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170 if (eintr) {
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171 continue;
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172 }
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173
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174 if (!complete) {
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175 wev->ready = 0;
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176 return cl;
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177 }
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178
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179 if (send >= limit || cl == NULL) {
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180 return cl;
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181 }
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182
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183 in = cl;
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184 }
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185 }
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