Mercurial > hg > nginx
annotate src/os/unix/ngx_readv_chain.c @ 4597:4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
Not using full chain passed is ok as consumers are expected to check
event's ready flag to determine if another call is needed, not the
returned size.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 17 Apr 2012 09:13:58 +0000 |
parents | d620f497c50f |
children | 13c006f0c40e |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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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> |
73
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11 |
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12 |
501 | 13 #define NGX_IOVS 16 |
14 | |
15 | |
469 | 16 #if (NGX_HAVE_KQUEUE) |
188
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17 |
501 | 18 ssize_t |
19 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
73
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20 { |
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21 u_char *prev; |
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22 ssize_t n, size; |
74
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23 ngx_err_t err; |
501 | 24 ngx_array_t vec; |
188
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25 ngx_event_t *rev; |
501 | 26 struct iovec *iov, iovs[NGX_IOVS]; |
188
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27 |
577 | 28 rev = c->read; |
188
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29 |
455 | 30 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
257
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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) { |
587 | 36 if (rev->pending_eof) { |
188
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37 rev->ready = 0; |
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38 rev->eof = 1; |
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39 |
587 | 40 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
41 "kevent() reported about an closed connection"); | |
42 | |
188
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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); |
587 | 46 return NGX_ERROR; |
188
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47 } |
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48 |
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49 return 0; |
587 | 50 |
51 } else { | |
52 return NGX_AGAIN; | |
188
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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; |
89
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58 iov = NULL; |
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59 size = 0; |
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60 |
501 | 61 vec.elts = iovs; |
62 vec.nelts = 0; | |
63 vec.size = sizeof(struct iovec); | |
64 vec.nalloc = NGX_IOVS; | |
65 vec.pool = c->pool; | |
73
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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 { |
4597
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
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74 if (vec.nelts >= IOV_MAX) { |
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
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75 break; |
4be36d5e78ae
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76 } |
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
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77 |
501 | 78 iov = ngx_array_push(&vec); |
79 if (iov == NULL) { | |
80 return NGX_ERROR; | |
81 } | |
82 | |
343
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83 iov->iov_base = (void *) chain->buf->last; |
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84 iov->iov_len = chain->buf->end - chain->buf->last; |
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85 } |
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86 |
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87 size += chain->buf->end - chain->buf->last; |
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88 prev = chain->buf->end; |
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89 chain = chain->next; |
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90 } |
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91 |
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92 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 93 "readv: %d, last:%d", vec.nelts, iov->iov_len); |
75
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94 |
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95 rev = c->read; |
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96 |
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97 do { |
501 | 98 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
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99 |
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100 if (n >= 0) { |
455 | 101 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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102 rev->available -= n; |
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103 |
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104 /* |
587 | 105 * rev->available may be negative here because some additional |
106 * bytes may be received between kevent() and recv() | |
188
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107 */ |
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108 |
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109 if (rev->available <= 0) { |
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110 if (!rev->pending_eof) { |
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111 rev->ready = 0; |
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112 } |
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113 |
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114 if (rev->available < 0) { |
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115 rev->available = 0; |
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116 } |
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117 } |
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118 |
605 | 119 if (n == 0) { |
120 | |
121 /* | |
122 * on FreeBSD recv() may return 0 on closed socket | |
123 * even if kqueue reported about available data | |
124 */ | |
125 | |
627 | 126 #if 0 |
605 | 127 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
609 | 128 "readv() returned 0 while kevent() reported " |
605 | 129 "%d available bytes", rev->available); |
627 | 130 #endif |
605 | 131 |
132 rev->eof = 1; | |
133 rev->available = 0; | |
134 } | |
135 | |
188
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136 return n; |
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137 } |
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138 |
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139 if (n < size) { |
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140 rev->ready = 0; |
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141 } |
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142 |
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143 if (n == 0) { |
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144 rev->eof = 1; |
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145 } |
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146 |
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147 return n; |
73
4534060fde92
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148 } |
4534060fde92
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parents:
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149 |
257
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diff
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150 err = ngx_socket_errno; |
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diff
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151 |
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152 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
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153 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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parents:
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154 "readv() not ready"); |
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parents:
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diff
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155 n = NGX_AGAIN; |
188
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156 |
257
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157 } else { |
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158 n = ngx_connection_error(c, err, "readv() failed"); |
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parents:
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diff
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159 break; |
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nginx-0.0.2-2004-02-11-20:08:49 import
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parents:
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160 } |
188
0061d1f0908d
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parents:
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161 |
257
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nginx-0.0.2-2004-02-11-20:08:49 import
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parents:
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162 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
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163 |
0061d1f0908d
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parents:
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164 rev->ready = 0; |
0061d1f0908d
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parents:
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165 |
3642 | 166 if (n == NGX_ERROR) { |
164
84036764e215
nginx-0.0.1-2003-10-29-11:30:44 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
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167 c->read->error = 1; |
73
4534060fde92
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parents:
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168 } |
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parents:
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169 |
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170 return n; |
4534060fde92
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parents:
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171 } |
188
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172 |
469 | 173 #else /* ! NGX_HAVE_KQUEUE */ |
188
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174 |
501 | 175 ssize_t |
176 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
188
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177 { |
305
4b1a3a4acc60
nginx-0.0.3-2004-04-02-19:13:20 import
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parents:
303
diff
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|
178 u_char *prev; |
188
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179 ssize_t n, size; |
0061d1f0908d
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180 ngx_err_t err; |
501 | 181 ngx_array_t vec; |
188
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182 ngx_event_t *rev; |
501 | 183 struct iovec *iov, iovs[NGX_IOVS]; |
188
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184 |
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185 prev = NULL; |
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186 iov = NULL; |
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187 size = 0; |
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188 |
501 | 189 vec.elts = iovs; |
190 vec.nelts = 0; | |
191 vec.size = sizeof(struct iovec); | |
192 vec.nalloc = NGX_IOVS; | |
193 vec.pool = c->pool; | |
188
0061d1f0908d
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194 |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
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parents:
328
diff
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195 /* coalesce the neighbouring bufs */ |
188
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parents:
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196 |
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parents:
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197 while (chain) { |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
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parents:
328
diff
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|
198 if (prev == chain->buf->last) { |
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
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parents:
328
diff
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199 iov->iov_len += chain->buf->end - chain->buf->last; |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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200 |
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parents:
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201 } else { |
4597
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
202 if (vec.nelts >= IOV_MAX) { |
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
203 break; |
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
204 } |
4be36d5e78ae
Fixed ngx_readv_chain() to honor IOV_MAX (ticket #14).
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
205 |
501 | 206 iov = ngx_array_push(&vec); |
207 if (iov == NULL) { | |
208 return NGX_ERROR; | |
209 } | |
210 | |
561 | 211 iov->iov_base = (void *) chain->buf->last; |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
212 iov->iov_len = chain->buf->end - chain->buf->last; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
213 } |
0061d1f0908d
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parents:
164
diff
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|
214 |
343
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
215 size += chain->buf->end - chain->buf->last; |
6bdf858bff8c
nginx-0.0.3-2004-05-28-19:49:23 import; rename ngx_hunk_t to ngx_buf_t
Igor Sysoev <igor@sysoev.ru>
parents:
328
diff
changeset
|
216 prev = chain->buf->end; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
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|
217 chain = chain->next; |
0061d1f0908d
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parents:
164
diff
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|
218 } |
0061d1f0908d
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parents:
164
diff
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|
219 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
220 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 221 "readv: %d:%d", vec.nelts, iov->iov_len); |
188
0061d1f0908d
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parents:
164
diff
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|
222 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
223 rev = c->read; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
224 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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|
225 do { |
501 | 226 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
changeset
|
227 |
328
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
228 if (n == 0) { |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
229 rev->ready = 0; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
230 rev->eof = 1; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
231 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
232 return n; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
233 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
234 } else if (n > 0) { |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
235 |
455 | 236 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
237 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
238 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
239 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
240 return n; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
241 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
242 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
243 err = ngx_socket_errno; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
244 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
245 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
246 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
247 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
248 n = NGX_AGAIN; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
249 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
250 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
251 n = ngx_connection_error(c, err, "readv() failed"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
252 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
253 } |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
254 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
255 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
256 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
257 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
258 |
3642 | 259 if (n == NGX_ERROR) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
260 c->read->error = 1; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
261 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
262 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
263 return n; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
264 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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265 |
469 | 266 #endif /* NGX_HAVE_KQUEUE */ |