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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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50
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13 #define NGX_IOVS 16
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14
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15
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18
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16 #if (NGX_HAVE_KQUEUE)
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0
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17
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50
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18 ssize_t
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19 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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0
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20 {
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21 u_char *prev;
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22 ssize_t n, size;
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23 ngx_err_t err;
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50
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24 ngx_array_t vec;
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0
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25 ngx_event_t *rev;
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50
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26 struct iovec *iov, iovs[NGX_IOVS];
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0
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27
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126
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28 rev = c->read;
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0
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29
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4
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30 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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31 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
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32 "readv: eof:%d, avail:%d, err:%d",
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33 rev->pending_eof, rev->available, rev->kq_errno);
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34
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35 if (rev->available == 0) {
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136
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36 if (rev->pending_eof) {
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0
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37 rev->ready = 0;
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38 rev->eof = 1;
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39
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136
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40 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno,
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41 "kevent() reported about an closed connection");
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42
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0
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43 if (rev->kq_errno) {
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44 rev->error = 1;
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45 ngx_set_socket_errno(rev->kq_errno);
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136
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46 return NGX_ERROR;
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0
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47 }
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48
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49 return 0;
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136
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50
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51 } else {
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52 return NGX_AGAIN;
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0
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53 }
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54 }
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55 }
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56
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57 prev = NULL;
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58 iov = NULL;
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59 size = 0;
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60
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50
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61 vec.elts = iovs;
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62 vec.nelts = 0;
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63 vec.size = sizeof(struct iovec);
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64 vec.nalloc = NGX_IOVS;
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65 vec.pool = c->pool;
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0
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66
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67 /* coalesce the neighbouring bufs */
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68
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69 while (chain) {
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70 if (prev == chain->buf->last) {
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71 iov->iov_len += chain->buf->end - chain->buf->last;
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72
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73 } else {
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50
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74 iov = ngx_array_push(&vec);
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75 if (iov == NULL) {
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76 return NGX_ERROR;
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77 }
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78
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0
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79 iov->iov_base = (void *) chain->buf->last;
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80 iov->iov_len = chain->buf->end - chain->buf->last;
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81 }
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82
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83 size += chain->buf->end - chain->buf->last;
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84 prev = chain->buf->end;
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85 chain = chain->next;
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86 }
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87
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88 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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50
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89 "readv: %d, last:%d", vec.nelts, iov->iov_len);
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0
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90
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91 rev = c->read;
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92
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93 do {
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50
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94 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts);
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0
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95
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96 if (n >= 0) {
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4
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97 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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98 rev->available -= n;
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99
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100 /*
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136
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101 * rev->available may be negative here because some additional
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102 * bytes may be received between kevent() and recv()
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0
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103 */
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104
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105 if (rev->available <= 0) {
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106 if (!rev->pending_eof) {
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107 rev->ready = 0;
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108 }
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109
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110 if (rev->available < 0) {
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111 rev->available = 0;
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112 }
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113 }
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114
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154
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115 if (n == 0) {
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116
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117 /*
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118 * on FreeBSD recv() may return 0 on closed socket
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119 * even if kqueue reported about available data
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120 */
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121
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176
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122 #if 0
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154
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123 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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158
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124 "readv() returned 0 while kevent() reported "
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154
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125 "%d available bytes", rev->available);
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176
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126 #endif
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154
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127
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128 rev->eof = 1;
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129 rev->available = 0;
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130 }
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131
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0
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132 return n;
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133 }
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134
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135 if (n < size) {
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136 rev->ready = 0;
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137 }
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138
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139 if (n == 0) {
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140 rev->eof = 1;
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141 }
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142
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143 return n;
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144 }
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145
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146 err = ngx_socket_errno;
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147
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148 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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149 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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150 "readv() not ready");
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151 n = NGX_AGAIN;
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152
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153 } else {
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154 n = ngx_connection_error(c, err, "readv() failed");
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155 break;
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156 }
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157
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158 } while (err == NGX_EINTR);
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159
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160 rev->ready = 0;
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161
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582
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162 if (n == NGX_ERROR) {
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0
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163 c->read->error = 1;
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164 }
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165
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166 return n;
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167 }
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168
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18
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169 #else /* ! NGX_HAVE_KQUEUE */
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0
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170
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50
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171 ssize_t
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172 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
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0
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173 {
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174 u_char *prev;
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175 ssize_t n, size;
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176 ngx_err_t err;
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50
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177 ngx_array_t vec;
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0
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178 ngx_event_t *rev;
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50
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179 struct iovec *iov, iovs[NGX_IOVS];
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0
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180
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181 prev = NULL;
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182 iov = NULL;
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183 size = 0;
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184
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50
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185 vec.elts = iovs;
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186 vec.nelts = 0;
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187 vec.size = sizeof(struct iovec);
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188 vec.nalloc = NGX_IOVS;
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189 vec.pool = c->pool;
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0
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190
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191 /* coalesce the neighbouring bufs */
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192
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193 while (chain) {
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194 if (prev == chain->buf->last) {
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195 iov->iov_len += chain->buf->end - chain->buf->last;
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196
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197 } else {
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50
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198 iov = ngx_array_push(&vec);
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199 if (iov == NULL) {
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200 return NGX_ERROR;
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201 }
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202
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110
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203 iov->iov_base = (void *) chain->buf->last;
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0
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204 iov->iov_len = chain->buf->end - chain->buf->last;
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205 }
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206
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207 size += chain->buf->end - chain->buf->last;
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208 prev = chain->buf->end;
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209 chain = chain->next;
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210 }
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211
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212 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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50
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213 "readv: %d:%d", vec.nelts, iov->iov_len);
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0
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214
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215 rev = c->read;
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216
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217 do {
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50
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218 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts);
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0
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219
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220 if (n == 0) {
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221 rev->ready = 0;
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222 rev->eof = 1;
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223
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224 return n;
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225
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226 } else if (n > 0) {
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227
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4
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228 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) {
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0
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229 rev->ready = 0;
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230 }
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231
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232 return n;
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233 }
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234
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235 err = ngx_socket_errno;
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236
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237 if (err == NGX_EAGAIN || err == NGX_EINTR) {
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238 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
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239 "readv() not ready");
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240 n = NGX_AGAIN;
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241
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242 } else {
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243 n = ngx_connection_error(c, err, "readv() failed");
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244 break;
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245 }
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246
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247 } while (err == NGX_EINTR);
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248
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249 rev->ready = 0;
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250
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582
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251 if (n == NGX_ERROR) {
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0
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252 c->read->error = 1;
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253 }
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254
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255 return n;
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256 }
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257
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18
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258 #endif /* NGX_HAVE_KQUEUE */
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