Mercurial > hg > nginx
annotate src/os/unix/ngx_posix_init.c @ 9300:5be23505292b default tip
SSI: fixed incorrect or duplicate stub output.
Following 3518:eb3aaf8bd2a9 (0.8.37), r->request_output is only set
if there are data in the first buffer sent in the subrequest. As a
result, following the change mentioned this flag cannot be used to
prevent duplicate ngx_http_ssi_stub_output() calls, since it is not
set if there was already some output, but the first buffer was empty.
Still, when there are multiple subrequests, even an empty subrequest
response might be delayed by the postpone filter, leading to a second
call of ngx_http_ssi_stub_output() during finalization from
ngx_http_writer() the subreqest buffers are released by the postpone
filter. Since r->request_output is not set after the first call, this
resulted in duplicate stub output.
Additionally, checking only the first buffer might be wrong in some
unusual cases. For example, the first buffer might be empty if
$r->flush() is called before printing any data in the embedded Perl
module.
Depending on the postpone_output value and corresponding sizes, this
issue can result in either duplicate or unexpected stub output, or
"zero size buf in writer" alerts.
Following 8124:f5515e727656 (1.23.4), it became slightly easier to
reproduce the issue, as empty static files and empty cache items now
result in a response with an empty buffer. Before the change, an empty
proxied response can be used to reproduce the issue.
Fix is check all buffers and set r->request_output if any non-empty
buffers are sent. This ensures that all unusual cases of non-empty
responses are covered, and also that r->request_output will be set
after the first stub output, preventing duplicate output.
Reported by Jan Gassen.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 04 Jul 2024 17:41:28 +0300 |
parents | 057adb2a9d23 |
children |
rev | line source |
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441
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1 |
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2 /* |
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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> |
539 | 10 #include <nginx.h> |
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11 |
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12 |
473 | 13 ngx_int_t ngx_ncpu; |
14 ngx_int_t ngx_max_sockets; | |
15 ngx_uint_t ngx_inherited_nonblocking; | |
16 ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush; | |
449
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17 |
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18 |
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19 struct rlimit rlmt; |
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20 |
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22 ngx_os_io_t ngx_os_io = { |
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23 ngx_unix_recv, |
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24 ngx_readv_chain, |
1689 | 25 ngx_udp_unix_recv, |
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26 ngx_unix_send, |
6436 | 27 ngx_udp_unix_send, |
6692 | 28 ngx_udp_unix_sendmsg_chain, |
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29 ngx_writev_chain, |
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30 0 |
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31 }; |
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32 |
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33 |
539 | 34 ngx_int_t |
35 ngx_os_init(ngx_log_t *log) | |
455 | 36 { |
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37 ngx_time_t *tp; |
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38 ngx_uint_t n; |
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39 #if (NGX_HAVE_LEVEL1_DCACHE_LINESIZE) |
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40 long size; |
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41 #endif |
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42 |
539 | 43 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
44 if (ngx_os_specific_init(log) != NGX_OK) { | |
45 return NGX_ERROR; | |
46 } | |
47 #endif | |
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48 |
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49 if (ngx_init_setproctitle(log) != NGX_OK) { |
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50 return NGX_ERROR; |
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51 } |
509 | 52 |
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53 ngx_pagesize = getpagesize(); |
589 | 54 ngx_cacheline_size = NGX_CPU_CACHE_LINE; |
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55 |
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56 for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ } |
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57 |
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58 #if (NGX_HAVE_SC_NPROCESSORS_ONLN) |
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59 if (ngx_ncpu == 0) { |
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60 ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN); |
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61 } |
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62 #endif |
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63 |
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64 if (ngx_ncpu < 1) { |
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65 ngx_ncpu = 1; |
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66 } |
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67 |
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68 #if (NGX_HAVE_LEVEL1_DCACHE_LINESIZE) |
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69 size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE); |
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70 if (size > 0) { |
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71 ngx_cacheline_size = size; |
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72 } |
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73 #endif |
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74 |
611 | 75 ngx_cpuinfo(); |
76 | |
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77 if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) { |
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78 ngx_log_error(NGX_LOG_ALERT, log, errno, |
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79 "getrlimit(RLIMIT_NOFILE) failed"); |
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80 return NGX_ERROR; |
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81 } |
577 | 82 |
563 | 83 ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur; |
93
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84 |
3786 | 85 #if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4) |
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86 ngx_inherited_nonblocking = 1; |
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87 #else |
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88 ngx_inherited_nonblocking = 0; |
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89 #endif |
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90 |
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91 tp = ngx_timeofday(); |
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92 srandom(((unsigned) ngx_pid << 16) ^ tp->sec ^ tp->msec); |
800 | 93 |
93
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94 return NGX_OK; |
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95 } |
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96 |
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97 |
539 | 98 void |
99 ngx_os_status(ngx_log_t *log) | |
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100 { |
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101 ngx_log_error(NGX_LOG_NOTICE, log, 0, NGINX_VER_BUILD); |
541 | 102 |
557 | 103 #ifdef NGX_COMPILER |
104 ngx_log_error(NGX_LOG_NOTICE, log, 0, "built by " NGX_COMPILER); | |
105 #endif | |
106 | |
539 | 107 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
108 ngx_os_specific_status(log); | |
109 #endif | |
110 | |
531 | 111 ngx_log_error(NGX_LOG_NOTICE, log, 0, |
461 | 112 "getrlimit(RLIMIT_NOFILE): %r:%r", |
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113 rlmt.rlim_cur, rlmt.rlim_max); |
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114 } |
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115 |
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116 |
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117 #if 0 |
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118 |
539 | 119 ngx_int_t |
120 ngx_posix_post_conf_init(ngx_log_t *log) | |
93
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121 { |
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122 ngx_fd_t pp[2]; |
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123 |
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124 if (pipe(pp) == -1) { |
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125 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed"); |
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126 return NGX_ERROR; |
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127 } |
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128 |
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129 if (dup2(pp[1], STDERR_FILENO) == -1) { |
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130 ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed"); |
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131 return NGX_ERROR; |
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132 } |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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133 |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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134 if (pp[1] > STDERR_FILENO) { |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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135 if (close(pp[1]) == -1) { |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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136 ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed"); |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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137 return NGX_ERROR; |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
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138 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
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139 } |
738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
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140 |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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141 return NGX_OK; |
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nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
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142 } |
4759
4c36e15651f7
Fixed compilation with -Wmissing-prototypes.
Ruslan Ermilov <ru@nginx.com>
parents:
4459
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143 |
4c36e15651f7
Fixed compilation with -Wmissing-prototypes.
Ruslan Ermilov <ru@nginx.com>
parents:
4459
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144 #endif |