Mercurial > hg > nginx
annotate src/os/unix/ngx_recv.c @ 3440:88741ec7731a stable-0.7
merge r3294, r3305:
Fix a bug introduced in r2032: After a child process has read a terminate
message from a channel, the process tries to read the channel again.
The kernel (at least FreeBSD) may preempt the process and sends a SIGIO
signal to a master process. The master process sends a new terminate message,
the kernel switches again to the the child process, and the child process
reads the messages instead of an EAGAIN error. And this may repeat over
and over. Being that the child process can not exit the cycle and test
the termination flag set by the message handler.
The fix disallow the master process to send a new terminate message on
SIGIO signal reception. It may send the message only on SIGALARM signal.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 01 Feb 2010 15:49:36 +0000 |
parents | c11d96cbad75 |
children | ac33852faaac |
rev | line source |
---|---|
441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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5 |
91
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
103
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9 #include <ngx_event.h> |
96
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10 |
91
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11 |
469 | 12 #if (NGX_HAVE_KQUEUE) |
91
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13 |
1680 | 14 ssize_t |
15 ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size) | |
91
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16 { |
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17 ssize_t n; |
253
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18 ngx_err_t err; |
96
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19 ngx_event_t *rev; |
91
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20 |
96
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21 rev = c->read; |
91
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22 |
455 | 23 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
218
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24 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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25 "recv: eof:%d, avail:%d, err:%d", |
375
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26 rev->pending_eof, rev->available, rev->kq_errno); |
91
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27 |
96
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28 if (rev->available == 0) { |
587 | 29 if (rev->pending_eof) { |
148
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30 rev->ready = 0; |
163
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31 rev->eof = 1; |
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32 |
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33 if (rev->kq_errno) { |
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34 rev->error = 1; |
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35 ngx_set_socket_errno(rev->kq_errno); |
218
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36 |
537 | 37 return ngx_connection_error(c, rev->kq_errno, |
38 "kevent() reported about an closed connection"); | |
96
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39 } |
163
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40 |
96
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41 return 0; |
587 | 42 |
43 } else { | |
1875
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44 rev->ready = 0; |
587 | 45 return NGX_AGAIN; |
96
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46 } |
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47 } |
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48 } |
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49 |
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50 do { |
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51 n = recv(c->fd, buf, size, 0); |
91
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52 |
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53 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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54 "recv: fd:%d %d of %d", c->fd, n, size); |
93
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55 |
96
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56 if (n >= 0) { |
455 | 57 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
96
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58 rev->available -= n; |
163
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59 |
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60 /* |
583 | 61 * rev->available may be negative here because some additional |
587 | 62 * bytes may be received between kevent() and recv() |
163
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63 */ |
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64 |
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65 if (rev->available <= 0) { |
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66 if (!rev->pending_eof) { |
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67 rev->ready = 0; |
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68 } |
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69 |
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70 if (rev->available < 0) { |
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71 rev->available = 0; |
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72 } |
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73 } |
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74 |
605 | 75 if (n == 0) { |
76 | |
77 /* | |
78 * on FreeBSD recv() may return 0 on closed socket | |
79 * even if kqueue reported about available data | |
80 */ | |
81 | |
82 rev->eof = 1; | |
83 rev->available = 0; | |
84 } | |
85 | |
96
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86 return n; |
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87 } |
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88 |
96
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89 if ((size_t) n < size) { |
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90 rev->ready = 0; |
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91 } |
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92 |
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93 if (n == 0) { |
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94 rev->eof = 1; |
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95 } |
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96 |
96
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97 return n; |
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98 } |
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99 |
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100 err = ngx_socket_errno; |
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101 |
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102 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
257
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103 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
253
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104 "recv() not ready"); |
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105 n = NGX_AGAIN; |
91
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106 |
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107 } else { |
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108 n = ngx_connection_error(c, err, "recv() failed"); |
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109 break; |
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110 } |
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111 |
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112 } while (err == NGX_EINTR); |
188
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113 |
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114 rev->ready = 0; |
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115 |
184
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116 if (n == NGX_ERROR){ |
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117 rev->error = 1; |
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118 } |
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119 |
91
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120 return n; |
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121 } |
96
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122 |
469 | 123 #else /* ! NGX_HAVE_KQUEUE */ |
96
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124 |
1680 | 125 ssize_t |
126 ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size) | |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
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127 { |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
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128 ssize_t n; |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
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129 ngx_err_t err; |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
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130 ngx_event_t *rev; |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
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parents:
93
diff
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131 |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
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132 rev = c->read; |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
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133 |
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nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
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134 do { |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
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135 n = recv(c->fd, buf, size, 0); |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
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136 |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
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137 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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138 "recv: fd:%d %d of %d", c->fd, n, size); |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
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139 |
328
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
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140 if (n == 0) { |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
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141 rev->ready = 0; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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142 rev->eof = 1; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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143 return n; |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
144 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
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145 } 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
|
146 |
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
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147 if ((size_t) n < size |
455 | 148 && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) |
328
fb4dfb2ac0fc
nginx-0.0.3-2004-04-28-10:14:50 import
Igor Sysoev <igor@sysoev.ru>
parents:
305
diff
changeset
|
149 { |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
150 rev->ready = 0; |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
151 } |
163
fb61ba77beba
nginx-0.0.1-2003-10-28-18:45:41 import
Igor Sysoev <igor@sysoev.ru>
parents:
148
diff
changeset
|
152 |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
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153 return n; |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
154 } |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
155 |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
156 err = ngx_socket_errno; |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
157 |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
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158 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
256
diff
changeset
|
159 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
160 "recv() not ready"); |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
161 n = NGX_AGAIN; |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
162 |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
163 } else { |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
164 n = ngx_connection_error(c, err, "recv() failed"); |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
165 break; |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
166 } |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
167 |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
218
diff
changeset
|
168 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
184
diff
changeset
|
169 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
184
diff
changeset
|
170 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
184
diff
changeset
|
171 |
184
1bf718ce0dde
nginx-0.0.1-2003-11-14-10:20:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
changeset
|
172 if (n == NGX_ERROR){ |
1bf718ce0dde
nginx-0.0.1-2003-11-14-10:20:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
changeset
|
173 rev->error = 1; |
1bf718ce0dde
nginx-0.0.1-2003-11-14-10:20:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
changeset
|
174 } |
1bf718ce0dde
nginx-0.0.1-2003-11-14-10:20:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
changeset
|
175 |
96
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
176 return n; |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
177 } |
a23d010f356d
nginx-0.0.1-2003-05-27-16:18:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
93
diff
changeset
|
178 |
469 | 179 #endif /* NGX_HAVE_KQUEUE */ |