Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_setproctitle.c @ 7870:e169cce912c7 quic
Avoid retransmitting of packets with discarded keys.
Sections 4.10.1 and 4.10.2 of quic transport describe discarding of initial
and handshake keys. Since the keys are discarded, we no longer need
to retransmit packets and corresponding queues should be emptied.
This patch removes previously added workaround that did not require
acknowledgement for initial packets, resulting in avoiding retransmission,
which is wrong because a packet could be lost and we have to retransmit it.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 18 May 2020 13:54:53 +0300 |
parents | 67653855682e |
children |
rev | line source |
---|---|
452 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
452 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
12 #if (NGX_SETPROCTITLE_USES_ENV) | |
13 | |
14 /* | |
15 * To change the process title in Linux and Solaris we have to set argv[1] | |
16 * to NULL and to copy the title to the same place where the argv[0] points to. | |
17 * However, argv[0] may be too small to hold a new title. Fortunately, Linux | |
18 * and Solaris store argv[] and environ[] one after another. So we should | |
19 * ensure that is the continuous memory and then we allocate the new memory | |
20 * for environ[] and copy it. After this we could use the memory starting | |
21 * from argv[0] for our process title. | |
22 * | |
23 * The Solaris's standard /bin/ps does not show the changed process title. | |
4572
67653855682e
Fixed spelling in multiline C comments.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
24 * You have to use "/usr/ucb/ps -w" instead. Besides, the UCB ps does not |
452 | 25 * show a new title if its length less than the origin command line length. |
26 * To avoid it we append to a new title the origin command line in the | |
27 * parenthesis. | |
28 */ | |
29 | |
30 extern char **environ; | |
31 | |
32 static char *ngx_os_argv_last; | |
33 | |
493 | 34 ngx_int_t |
35 ngx_init_setproctitle(ngx_log_t *log) | |
452 | 36 { |
493 | 37 u_char *p; |
452 | 38 size_t size; |
39 ngx_uint_t i; | |
40 | |
41 size = 0; | |
42 | |
43 for (i = 0; environ[i]; i++) { | |
44 size += ngx_strlen(environ[i]) + 1; | |
45 } | |
46 | |
501 | 47 p = ngx_alloc(size, log); |
48 if (p == NULL) { | |
452 | 49 return NGX_ERROR; |
50 } | |
51 | |
52 ngx_os_argv_last = ngx_os_argv[0]; | |
53 | |
54 for (i = 0; ngx_os_argv[i]; i++) { | |
55 if (ngx_os_argv_last == ngx_os_argv[i]) { | |
56 ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1; | |
57 } | |
58 } | |
59 | |
60 for (i = 0; environ[i]; i++) { | |
61 if (ngx_os_argv_last == environ[i]) { | |
62 | |
63 size = ngx_strlen(environ[i]) + 1; | |
64 ngx_os_argv_last = environ[i] + size; | |
65 | |
493 | 66 ngx_cpystrn(p, (u_char *) environ[i], size); |
67 environ[i] = (char *) p; | |
452 | 68 p += size; |
69 } | |
70 } | |
71 | |
72 ngx_os_argv_last--; | |
73 | |
74 return NGX_OK; | |
75 } | |
76 | |
77 | |
493 | 78 void |
79 ngx_setproctitle(char *title) | |
452 | 80 { |
81 u_char *p; | |
82 | |
455 | 83 #if (NGX_SOLARIS) |
452 | 84 |
85 ngx_int_t i; | |
86 size_t size; | |
87 | |
88 #endif | |
89 | |
90 ngx_os_argv[1] = NULL; | |
91 | |
507 | 92 p = ngx_cpystrn((u_char *) ngx_os_argv[0], (u_char *) "nginx: ", |
452 | 93 ngx_os_argv_last - ngx_os_argv[0]); |
94 | |
95 p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p); | |
96 | |
455 | 97 #if (NGX_SOLARIS) |
452 | 98 |
99 size = 0; | |
100 | |
101 for (i = 0; i < ngx_argc; i++) { | |
102 size += ngx_strlen(ngx_argv[i]) + 1; | |
103 } | |
104 | |
105 if (size > (size_t) ((char *) p - ngx_os_argv[0])) { | |
106 | |
107 /* | |
108 * ngx_setproctitle() is too rare operation so we use | |
109 * the non-optimized copies | |
110 */ | |
111 | |
112 p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p); | |
113 | |
114 for (i = 0; i < ngx_argc; i++) { | |
115 p = ngx_cpystrn(p, (u_char *) ngx_argv[i], | |
116 ngx_os_argv_last - (char *) p); | |
117 p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p); | |
118 } | |
119 | |
120 if (*(p - 1) == ' ') { | |
121 *(p - 1) = ')'; | |
122 } | |
123 } | |
124 | |
125 #endif | |
126 | |
127 if (ngx_os_argv_last - (char *) p) { | |
128 ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p); | |
129 } | |
130 | |
131 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
132 "setproctitle: \"%s\"", ngx_os_argv[0]); | |
133 } | |
134 | |
509 | 135 #endif /* NGX_SETPROCTITLE_USES_ENV */ |