Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_readv_chain.c @ 6355:c36482d0a79f stable-1.8
Resolver: fixed possible segmentation fault on DNS format error.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Tue, 26 Jan 2016 16:46:18 +0300 |
parents | ec81934727a1 |
children | f01ab2dbcfdc |
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 |
73
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
103
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10 #include <ngx_event.h> |
73
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11 |
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12 |
501 | 13 ssize_t |
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14 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) |
73
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15 { |
290
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16 u_char *prev; |
164
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17 ssize_t n, size; |
74
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18 ngx_err_t err; |
501 | 19 ngx_array_t vec; |
188
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20 ngx_event_t *rev; |
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21 struct iovec *iov, iovs[NGX_IOVS_PREALLOCATE]; |
188
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22 |
577 | 23 rev = c->read; |
188
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24 |
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25 #if (NGX_HAVE_KQUEUE) |
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26 |
455 | 27 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
257
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28 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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29 "readv: eof:%d, avail:%d, err:%d", |
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30 rev->pending_eof, rev->available, rev->kq_errno); |
188
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31 |
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32 if (rev->available == 0) { |
587 | 33 if (rev->pending_eof) { |
188
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34 rev->ready = 0; |
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35 rev->eof = 1; |
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36 |
587 | 37 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
38 "kevent() reported about an closed connection"); | |
39 | |
188
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40 if (rev->kq_errno) { |
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41 rev->error = 1; |
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42 ngx_set_socket_errno(rev->kq_errno); |
587 | 43 return NGX_ERROR; |
188
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44 } |
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45 |
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46 return 0; |
587 | 47 |
48 } else { | |
49 return NGX_AGAIN; | |
188
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50 } |
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51 } |
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52 } |
73
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53 |
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54 #endif |
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55 |
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56 prev = NULL; |
89
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57 iov = NULL; |
164
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58 size = 0; |
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59 |
501 | 60 vec.elts = iovs; |
61 vec.nelts = 0; | |
62 vec.size = sizeof(struct iovec); | |
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63 vec.nalloc = NGX_IOVS_PREALLOCATE; |
501 | 64 vec.pool = c->pool; |
73
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65 |
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66 /* coalesce the neighbouring bufs */ |
150
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67 |
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68 while (chain) { |
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69 n = chain->buf->end - chain->buf->last; |
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70 |
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71 if (limit) { |
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72 if (size >= limit) { |
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73 break; |
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74 } |
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75 |
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76 if (size + n > limit) { |
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77 n = (ssize_t) (limit - size); |
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78 } |
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79 } |
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80 |
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81 if (prev == chain->buf->last) { |
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82 iov->iov_len += n; |
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83 |
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84 } else { |
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85 if (vec.nelts >= IOV_MAX) { |
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86 break; |
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87 } |
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88 |
501 | 89 iov = ngx_array_push(&vec); |
90 if (iov == NULL) { | |
91 return NGX_ERROR; | |
92 } | |
93 | |
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94 iov->iov_base = (void *) chain->buf->last; |
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95 iov->iov_len = n; |
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96 } |
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97 |
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98 size += n; |
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99 prev = chain->buf->end; |
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100 chain = chain->next; |
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101 } |
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102 |
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103 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 104 "readv: %d, last:%d", vec.nelts, iov->iov_len); |
75
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105 |
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106 do { |
501 | 107 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
73
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108 |
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109 if (n >= 0) { |
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110 |
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111 #if (NGX_HAVE_KQUEUE) |
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112 |
455 | 113 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
188
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114 rev->available -= n; |
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115 |
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116 /* |
587 | 117 * rev->available may be negative here because some additional |
118 * bytes may be received between kevent() and recv() | |
188
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119 */ |
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120 |
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121 if (rev->available <= 0) { |
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122 if (!rev->pending_eof) { |
188
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123 rev->ready = 0; |
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124 } |
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125 |
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126 if (rev->available < 0) { |
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127 rev->available = 0; |
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164
diff
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128 } |
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parents:
164
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129 } |
73
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parents:
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130 |
605 | 131 if (n == 0) { |
132 | |
133 /* | |
134 * on FreeBSD recv() may return 0 on closed socket | |
135 * even if kqueue reported about available data | |
136 */ | |
137 | |
627 | 138 #if 0 |
605 | 139 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
609 | 140 "readv() returned 0 while kevent() reported " |
605 | 141 "%d available bytes", rev->available); |
627 | 142 #endif |
605 | 143 |
5370
ee78c7705a8e
Fixed handling of the ready flag with kqueue.
Valentin Bartenev <vbart@nginx.com>
parents:
5267
diff
changeset
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144 rev->ready = 0; |
605 | 145 rev->eof = 1; |
146 rev->available = 0; | |
147 } | |
148 | |
188
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149 return n; |
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nginx-0.0.1-2003-11-18-11:04:34 import
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150 } |
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nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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151 |
5852
43512a33e8f2
Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
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152 #endif /* NGX_HAVE_KQUEUE */ |
43512a33e8f2
Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
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153 |
5267
13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
Valentin Bartenev <vbart@nginx.com>
parents:
4597
diff
changeset
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154 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
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155 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
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156 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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157 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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158 if (n == 0) { |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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159 rev->eof = 1; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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160 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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161 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
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162 return n; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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163 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
164 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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165 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
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166 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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167 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
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parents:
188
diff
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168 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
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169 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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170 n = NGX_AGAIN; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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|
171 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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172 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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173 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
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174 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
175 } |
188
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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176 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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177 } 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
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178 |
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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179 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
180 |
3642 | 181 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
changeset
|
182 c->read->error = 1; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
183 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
184 |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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185 return n; |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
186 } |