Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_empty_gif_module.c @ 7374:de50fa05fbeb
Cache: fixed minimum cache keys zone size limit.
Size of a shared memory zones must be at least two pages - one page
for slab allocator internal data, and another page for actual allocations.
Using 8192 instead is wrong, as there are systems with page sizes other
than 4096.
Note well that two pages is usually too low as well. In particular, cache
is likely to use two allocations of different sizes for global structures,
and at least four pages will be needed to properly allocate cache nodes.
Except in a few very special cases, with keys zone of just two pages nginx
won't be able to start. Other uses of shared memory impose a limit
of 8 pages, which provides some room for global allocations. This patch
doesn't try to address this though.
Inspired by ticket #1665.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 31 Oct 2018 16:49:39 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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577 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
577 | 5 */ |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_http.h> | |
10 | |
11 | |
12 static char *ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, | |
13 void *conf); | |
14 | |
15 static ngx_command_t ngx_http_empty_gif_commands[] = { | |
16 | |
17 { ngx_string("empty_gif"), | |
18 NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, | |
19 ngx_http_empty_gif, | |
20 0, | |
21 0, | |
22 NULL }, | |
23 | |
24 ngx_null_command | |
25 }; | |
26 | |
27 | |
28 /* the minimal single pixel transparent GIF, 43 bytes */ | |
29 | |
30 static u_char ngx_empty_gif[] = { | |
31 | |
581 | 32 'G', 'I', 'F', '8', '9', 'a', /* header */ |
577 | 33 |
581 | 34 /* logical screen descriptor */ |
35 0x01, 0x00, /* logical screen width */ | |
36 0x01, 0x00, /* logical screen height */ | |
37 0x80, /* global 1-bit color table */ | |
38 0x01, /* background color #1 */ | |
39 0x00, /* no aspect ratio */ | |
577 | 40 |
581 | 41 /* global color table */ |
42 0x00, 0x00, 0x00, /* #0: black */ | |
43 0xff, 0xff, 0xff, /* #1: white */ | |
577 | 44 |
581 | 45 /* graphic control extension */ |
46 0x21, /* extension introducer */ | |
47 0xf9, /* graphic control label */ | |
48 0x04, /* block size */ | |
49 0x01, /* transparent color is given, */ | |
50 /* no disposal specified, */ | |
51 /* user input is not expected */ | |
52 0x00, 0x00, /* delay time */ | |
53 0x01, /* transparent color #1 */ | |
54 0x00, /* block terminator */ | |
577 | 55 |
581 | 56 /* image descriptor */ |
57 0x2c, /* image separator */ | |
58 0x00, 0x00, /* image left position */ | |
59 0x00, 0x00, /* image top position */ | |
60 0x01, 0x00, /* image width */ | |
61 0x01, 0x00, /* image height */ | |
62 0x00, /* no local color table, no interlaced */ | |
577 | 63 |
581 | 64 /* table based image data */ |
65 0x02, /* LZW minimum code size, */ | |
66 /* must be at least 2-bit */ | |
67 0x02, /* block size */ | |
577 | 68 0x4c, 0x01, /* compressed bytes 01_001_100, 0000000_1 */ |
581 | 69 /* 100: clear code */ |
70 /* 001: 1 */ | |
71 /* 101: end of information code */ | |
72 0x00, /* block terminator */ | |
577 | 73 |
581 | 74 0x3B /* trailer */ |
577 | 75 }; |
76 | |
77 | |
667 | 78 static ngx_http_module_t ngx_http_empty_gif_module_ctx = { |
577 | 79 NULL, /* preconfiguration */ |
80 NULL, /* postconfiguration */ | |
81 | |
82 NULL, /* create main configuration */ | |
83 NULL, /* init main configuration */ | |
84 | |
85 NULL, /* create server configuration */ | |
86 NULL, /* merge server configuration */ | |
87 | |
88 NULL, /* create location configuration */ | |
89 NULL /* merge location configuration */ | |
90 }; | |
91 | |
92 | |
93 ngx_module_t ngx_http_empty_gif_module = { | |
94 NGX_MODULE_V1, | |
95 &ngx_http_empty_gif_module_ctx, /* module context */ | |
96 ngx_http_empty_gif_commands, /* module directives */ | |
97 NGX_HTTP_MODULE, /* module type */ | |
98 NULL, /* init master */ | |
99 NULL, /* init module */ | |
100 NULL, /* init process */ | |
101 NULL, /* init thread */ | |
102 NULL, /* exit thread */ | |
103 NULL, /* exit process */ | |
104 NULL, /* exit master */ | |
105 NGX_MODULE_V1_PADDING | |
106 }; | |
107 | |
108 | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
|
109 static ngx_str_t ngx_http_gif_type = ngx_string("image/gif"); |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
|
110 |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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111 |
577 | 112 static ngx_int_t |
113 ngx_http_empty_gif_handler(ngx_http_request_t *r) | |
114 { | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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115 ngx_http_complex_value_t cv; |
577 | 116 |
645 | 117 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { |
577 | 118 return NGX_HTTP_NOT_ALLOWED; |
119 } | |
120 | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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121 ngx_memzero(&cv, sizeof(ngx_http_complex_value_t)); |
577 | 122 |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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123 cv.value.len = sizeof(ngx_empty_gif); |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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124 cv.value.data = ngx_empty_gif; |
577 | 125 r->headers_out.last_modified_time = 23349600; |
126 | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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127 return ngx_http_send_response(r, NGX_HTTP_OK, &ngx_http_gif_type, &cv); |
577 | 128 } |
129 | |
130 | |
131 static char * | |
132 ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
133 { | |
134 ngx_http_core_loc_conf_t *clcf; | |
135 | |
136 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); | |
137 clcf->handler = ngx_http_empty_gif_handler; | |
138 | |
139 return NGX_CONF_OK; | |
140 } |