Mercurial > hg > nginx
annotate src/os/unix/ngx_time.c @ 8078:5244d3b165ff
SSL: single allocation in session cache on 32-bit platforms.
Given the present typical SSL session sizes, on 32-bit platforms it is
now beneficial to store all data in a single allocation, since rbtree
node + session id + ASN1 representation of a session takes 256 bytes of
shared memory (36 + 32 + 150 = about 218 bytes plus SNI server name).
Storing all data in a single allocation is beneficial for SNI names up to
about 40 characters long and makes it possible to store about 4000 sessions
in one megabyte (instead of about 3000 sessions now). This also slightly
simplifies the code.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 12 Oct 2022 20:14:40 +0300 |
parents | d620f497c50f |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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2220 | 12 /* |
13 * FreeBSD does not test /etc/localtime change, however, we can workaround it | |
14 * by calling tzset() with TZ and then without TZ to update timezone. | |
15 * The trick should work since FreeBSD 2.1.0. | |
16 * | |
17 * Linux does not test /etc/localtime change in localtime(), | |
18 * but may stat("/etc/localtime") several times in every strftime(), | |
19 * therefore we use it to update timezone. | |
20 * | |
21 * Solaris does not test /etc/TIMEZONE change too and no workaround available. | |
22 */ | |
23 | |
24 void | |
25 ngx_timezone_update(void) | |
26 { | |
27 #if (NGX_FREEBSD) | |
28 | |
29 if (getenv("TZ")) { | |
30 return; | |
31 } | |
32 | |
33 putenv("TZ=UTC"); | |
34 | |
35 tzset(); | |
36 | |
37 unsetenv("TZ"); | |
38 | |
39 tzset(); | |
40 | |
41 #elif (NGX_LINUX) | |
42 time_t s; | |
43 struct tm *t; | |
44 char buf[4]; | |
45 | |
46 s = time(0); | |
47 | |
48 t = localtime(&s); | |
49 | |
50 strftime(buf, 4, "%H", t); | |
51 | |
52 #endif | |
53 } | |
54 | |
55 | |
563 | 56 void |
57 ngx_localtime(time_t s, ngx_tm_t *tm) | |
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58 { |
469 | 59 #if (NGX_HAVE_LOCALTIME_R) |
563 | 60 (void) localtime_r(&s, tm); |
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62 #else |
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63 ngx_tm_t *t; |
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563 | 65 t = localtime(&s); |
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66 *tm = *t; |
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68 #endif |
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70 tm->ngx_tm_mon++; |
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71 tm->ngx_tm_year += 1900; |
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72 } |
509 | 73 |
74 | |
563 | 75 void |
76 ngx_libc_localtime(time_t s, struct tm *tm) | |
509 | 77 { |
78 #if (NGX_HAVE_LOCALTIME_R) | |
563 | 79 (void) localtime_r(&s, tm); |
509 | 80 |
81 #else | |
82 struct tm *t; | |
83 | |
563 | 84 t = localtime(&s); |
509 | 85 *tm = *t; |
86 | |
87 #endif | |
88 } | |
89 | |
90 | |
563 | 91 void |
92 ngx_libc_gmtime(time_t s, struct tm *tm) | |
509 | 93 { |
94 #if (NGX_HAVE_LOCALTIME_R) | |
563 | 95 (void) gmtime_r(&s, tm); |
509 | 96 |
97 #else | |
98 struct tm *t; | |
99 | |
563 | 100 t = gmtime(&s); |
509 | 101 *tm = *t; |
102 | |
103 #endif | |
104 } |