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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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50
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12 #define NGX_IOVS 16
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13
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14
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18
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15 #if (NGX_HAVE_KQUEUE)
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0
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16
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50
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17 ssize_t
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18 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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0
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19 {
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20 u_char *prev;
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21 ssize_t n, size;
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22 ngx_err_t err;
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50
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23 ngx_array_t vec;
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0
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24 ngx_event_t *rev;
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50
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25 struct iovec *iov, iovs[NGX_IOVS];
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0
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26
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126
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27 rev = c->read;
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0
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28
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4
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29 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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30 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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31 "readv: eof:%d, avail:%d, err:%d",
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32 rev->pending_eof, rev->available, rev->kq_errno);
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33
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34 if (rev->available == 0) {
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136
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35 if (rev->pending_eof) {
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0
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36 rev->ready = 0;
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37 rev->eof = 1;
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38
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136
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39 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno,
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40 "kevent() reported about an closed connection");
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41
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0
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42 if (rev->kq_errno) {
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43 rev->error = 1;
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44 ngx_set_socket_errno(rev->kq_errno);
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136
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45 return NGX_ERROR;
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0
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46 }
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47
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48 return 0;
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136
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49
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50 } else {
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51 return NGX_AGAIN;
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0
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52 }
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53 }
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54 }
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55
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56 prev = NULL;
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57 iov = NULL;
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58 size = 0;
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59
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50
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60 vec.elts = iovs;
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61 vec.nelts = 0;
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62 vec.size = sizeof(struct iovec);
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63 vec.nalloc = NGX_IOVS;
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64 vec.pool = c->pool;
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0
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65
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66 /* coalesce the neighbouring bufs */
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67
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68 while (chain) {
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69 if (prev == chain->buf->last) {
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70 iov->iov_len += chain->buf->end - chain->buf->last;
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71
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72 } else {
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50
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73 iov = ngx_array_push(&vec);
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74 if (iov == NULL) {
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75 return NGX_ERROR;
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76 }
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77
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0
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78 iov->iov_base = (void *) chain->buf->last;
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79 iov->iov_len = chain->buf->end - chain->buf->last;
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80 }
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81
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82 size += chain->buf->end - chain->buf->last;
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83 prev = chain->buf->end;
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84 chain = chain->next;
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85 }
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86
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87 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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50
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88 "readv: %d, last:%d", vec.nelts, iov->iov_len);
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0
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89
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90 rev = c->read;
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91
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92 do {
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50
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93 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts);
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0
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94
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95 if (n >= 0) {
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4
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96 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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97 rev->available -= n;
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98
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99 /*
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136
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100 * rev->available may be negative here because some additional
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101 * bytes may be received between kevent() and recv()
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0
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102 */
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103
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104 if (rev->available <= 0) {
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105 if (!rev->pending_eof) {
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106 rev->ready = 0;
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107 }
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108
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109 if (rev->available < 0) {
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110 rev->available = 0;
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111 }
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112 }
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113
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154
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114 if (n == 0) {
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115
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116 /*
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117 * on FreeBSD recv() may return 0 on closed socket
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118 * even if kqueue reported about available data
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119 */
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120
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121 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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158
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122 "readv() returned 0 while kevent() reported "
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154
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123 "%d available bytes", rev->available);
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124
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125 rev->eof = 1;
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126 rev->available = 0;
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127 }
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128
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0
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129 return n;
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130 }
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131
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132 if (n < size) {
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133 rev->ready = 0;
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134 }
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135
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136 if (n == 0) {
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137 rev->eof = 1;
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138 }
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139
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140 return n;
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141 }
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142
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143 err = ngx_socket_errno;
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144
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145 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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146 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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147 "readv() not ready");
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148 n = NGX_AGAIN;
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149
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150 } else {
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151 n = ngx_connection_error(c, err, "readv() failed");
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152 break;
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153 }
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154
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155 } while (err == NGX_EINTR);
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156
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157 rev->ready = 0;
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158
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159 if (n == NGX_ERROR){
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160 c->read->error = 1;
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161 }
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162
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163 return n;
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164 }
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165
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18
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166 #else /* ! NGX_HAVE_KQUEUE */
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0
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167
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50
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168 ssize_t
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169 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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0
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170 {
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171 u_char *prev;
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172 ssize_t n, size;
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173 ngx_err_t err;
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50
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174 ngx_array_t vec;
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0
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175 ngx_event_t *rev;
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50
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176 struct iovec *iov, iovs[NGX_IOVS];
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0
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177
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178 prev = NULL;
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179 iov = NULL;
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180 size = 0;
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181
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50
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182 vec.elts = iovs;
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183 vec.nelts = 0;
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184 vec.size = sizeof(struct iovec);
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185 vec.nalloc = NGX_IOVS;
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186 vec.pool = c->pool;
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0
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187
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188 /* coalesce the neighbouring bufs */
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189
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190 while (chain) {
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191 if (prev == chain->buf->last) {
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192 iov->iov_len += chain->buf->end - chain->buf->last;
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193
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194 } else {
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50
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195 iov = ngx_array_push(&vec);
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196 if (iov == NULL) {
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197 return NGX_ERROR;
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198 }
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199
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110
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200 iov->iov_base = (void *) chain->buf->last;
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0
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201 iov->iov_len = chain->buf->end - chain->buf->last;
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202 }
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203
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204 size += chain->buf->end - chain->buf->last;
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205 prev = chain->buf->end;
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206 chain = chain->next;
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207 }
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208
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209 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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50
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210 "readv: %d:%d", vec.nelts, iov->iov_len);
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0
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211
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212 rev = c->read;
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213
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214 do {
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50
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215 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts);
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0
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216
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217 if (n == 0) {
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218 rev->ready = 0;
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219 rev->eof = 1;
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220
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221 return n;
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222
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223 } else if (n > 0) {
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224
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4
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225 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) {
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0
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226 rev->ready = 0;
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227 }
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228
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229 return n;
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230 }
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231
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232 err = ngx_socket_errno;
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233
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234 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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235 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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236 "readv() not ready");
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237 n = NGX_AGAIN;
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238
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239 } else {
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240 n = ngx_connection_error(c, err, "readv() failed");
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241 break;
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242 }
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243
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244 } while (err == NGX_EINTR);
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245
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246 rev->ready = 0;
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247
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248 if (n == NGX_ERROR){
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249 c->read->error = 1;
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250 }
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251
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252 return n;
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253 }
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254
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18
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255 #endif /* NGX_HAVE_KQUEUE */
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