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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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12 #define NGX_IOVS 8
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13
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14
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15 ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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16 {
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17 u_char *prev;
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18 ssize_t n, size;
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19 off_t send, sprev, sent;
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20 ngx_uint_t eintr, complete;
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21 ngx_err_t err;
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22 ngx_array_t vec;
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23 ngx_chain_t *cl;
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24 ngx_event_t *wev;
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25 struct iovec *iov, iovs[NGX_IOVS];
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26
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27 wev = c->write;
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28
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29 if (!wev->ready) {
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30 return in;
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31 }
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32
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33 #if (HAVE_KQUEUE)
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34
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4
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35 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
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0
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36 ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno,
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37 "kevent() reported about an closed connection");
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38
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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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45 send = 0;
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46 complete = 0;
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47
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48 vec.elts = iovs;
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49 vec.size = sizeof(struct iovec);
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50 vec.nalloc = NGX_IOVS;
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51 vec.pool = c->pool;
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52
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53 for ( ;; ) {
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54 prev = NULL;
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55 iov = NULL;
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56 eintr = 0;
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57 sprev = send;
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58
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59 vec.nelts = 0;
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60
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61 /* create the iovec and coalesce the neighbouring bufs */
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62
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63 for (cl = in; cl && vec.nelts < IOV_MAX && send < limit; cl = cl->next)
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64 {
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65 if (ngx_buf_special(cl->buf)) {
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66 continue;
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67 }
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68
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69 size = cl->buf->last - cl->buf->pos;
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70
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71 if (send + size > limit) {
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72 size = limit - send;
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73 }
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74
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75 if (prev == cl->buf->pos) {
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76 iov->iov_len += size;
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77
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78 } else {
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79 if (!(iov = ngx_array_push(&vec))) {
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80 return NGX_CHAIN_ERROR;
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81 }
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82
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83 iov->iov_base = (void *) cl->buf->pos;
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84 iov->iov_len = size;
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85 }
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86
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87 prev = cl->buf->pos + size;
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88 send += size;
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89 }
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90
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91 n = writev(c->fd, vec.elts, vec.nelts);
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92
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93 if (n == -1) {
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94 err = ngx_errno;
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95
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96 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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97 if (err == NGX_EINTR) {
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98 eintr = 1;
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99 }
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100
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101 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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102 "writev() not ready");
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103
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104 } else {
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105 wev->error = 1;
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106 ngx_connection_error(c, err, "writev() failed");
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107 return NGX_CHAIN_ERROR;
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108 }
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109 }
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110
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111 sent = n > 0 ? n : 0;
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112
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113 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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114 "writev: " OFF_T_FMT, sent);
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115
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116 if (send - sprev == sent) {
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117 complete = 1;
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118 }
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119
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120 c->sent += sent;
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121
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122 for (cl = in; cl && sent > 0; cl = cl->next) {
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123 if (ngx_buf_special(cl->buf)) {
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124 continue;
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125 }
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126
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127 if (sent == 0) {
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128 break;
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129 }
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130
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131 size = cl->buf->last - cl->buf->pos;
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132
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133 if (sent >= size) {
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134 sent -= size;
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135 cl->buf->pos = cl->buf->last;
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136
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137 continue;
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138 }
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139
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140 cl->buf->pos += sent;
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141
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142 break;
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143 }
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144
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145 if (eintr) {
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146 continue;
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147 }
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148
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149 if (!complete) {
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150 wev->ready = 0;
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151 return cl;
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152 }
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153
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154 if (send >= limit || cl == NULL) {
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155 return cl;
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156 }
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157
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158 in = cl;
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159 }
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160 }
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