Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_event_log.c @ 6133:af7eba90645d
Win32: shared memory base addresses and remapping.
Two mechanisms are implemented to make it possible to store pointers
in shared memory on Windows, in particular on Windows Vista and later
versions with ASLR:
- The ngx_shm_remap() function added to allow remapping of a shared memory
zone to the address originally used for it in the master process. While
important, it doesn't solve the problem by itself as in many cases it's
not possible to use the address because of conflicts with other
allocations.
- We now create mappings at the same address in all processes by starting
mappings at predefined addresses normally unused by newborn processes.
These two mechanisms combined allow to use shared memory on Windows
almost without problems, including reloads.
Based on the patch by Sergey Brester:
http://mailman.nginx.org/pipermail/nginx-devel/2015-April/006836.html
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 27 Apr 2015 18:25:42 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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2725 | 1 /* |
2 * Copyright (C) Igor Sysoev | |
4412 | 3 * Copyright (C) Nginx, Inc. |
2725 | 4 */ |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 #define NGX_MAX_ERROR_STR 2048 | |
12 | |
13 | |
14 void ngx_cdecl | |
15 ngx_event_log(ngx_err_t err, const char *fmt, ...) | |
16 { | |
17 u_char *p, *last; | |
18 long types; | |
19 HKEY key; | |
20 HANDLE ev; | |
21 va_list args; | |
22 u_char text[NGX_MAX_ERROR_STR]; | |
23 const char *msgarg[9]; | |
24 static u_char netmsg[] = "%SystemRoot%\\System32\\netmsg.dll"; | |
25 | |
2764
d4a717592877
use ngx_vslprintf(), ngx_slprintf()
Igor Sysoev <igor@sysoev.ru>
parents:
2725
diff
changeset
|
26 last = text + NGX_MAX_ERROR_STR; |
2725 | 27 p = text + GetModuleFileName(NULL, (char *) text, NGX_MAX_ERROR_STR - 50); |
28 | |
29 *p++ = ':'; | |
30 ngx_linefeed(p); | |
31 | |
32 va_start(args, fmt); | |
2764
d4a717592877
use ngx_vslprintf(), ngx_slprintf()
Igor Sysoev <igor@sysoev.ru>
parents:
2725
diff
changeset
|
33 p = ngx_vslprintf(p, last, fmt, args); |
2725 | 34 va_end(args); |
35 | |
36 if (err) { | |
2765 | 37 p = ngx_log_errno(p, last, err); |
2725 | 38 } |
39 | |
40 if (p > last - NGX_LINEFEED_SIZE - 1) { | |
41 p = last - NGX_LINEFEED_SIZE - 1; | |
42 } | |
43 | |
44 ngx_linefeed(p); | |
45 | |
46 *p = '\0'; | |
47 | |
48 /* | |
49 * we do not log errors here since we use | |
50 * Event Log only to log our own logs open errors | |
51 */ | |
52 | |
53 if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, | |
54 "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\nginx", | |
55 0, NULL, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, NULL, &key, NULL) | |
56 != 0) | |
57 { | |
58 return; | |
59 } | |
60 | |
61 if (RegSetValueEx(key, "EventMessageFile", 0, REG_EXPAND_SZ, | |
62 netmsg, sizeof(netmsg) - 1) | |
63 != 0) | |
64 { | |
65 return; | |
66 } | |
67 | |
68 types = EVENTLOG_ERROR_TYPE; | |
69 | |
70 if (RegSetValueEx(key, "TypesSupported", 0, REG_DWORD, | |
71 (u_char *) &types, sizeof(long)) | |
72 != 0) | |
73 { | |
74 return; | |
75 } | |
76 | |
77 RegCloseKey(key); | |
78 | |
79 ev = RegisterEventSource(NULL, "nginx"); | |
80 | |
81 msgarg[0] = (char *) text; | |
82 msgarg[1] = NULL; | |
83 msgarg[2] = NULL; | |
84 msgarg[3] = NULL; | |
85 msgarg[4] = NULL; | |
86 msgarg[5] = NULL; | |
87 msgarg[6] = NULL; | |
88 msgarg[7] = NULL; | |
89 msgarg[8] = NULL; | |
90 | |
91 /* | |
92 * the 3299 event id in netmsg.dll has the generic message format: | |
93 * "%1 %2 %3 %4 %5 %6 %7 %8 %9" | |
94 */ | |
95 | |
96 ReportEvent(ev, EVENTLOG_ERROR_TYPE, 0, 3299, NULL, 9, 0, msgarg, NULL); | |
97 | |
98 DeregisterEventSource(ev); | |
99 } |