Mercurial > hg > nginx
annotate src/os/unix/ngx_setproctitle.c @ 7668:0a04e5e4c40b
Large block sizes on Linux are now ignored (ticket #1168).
NFS on Linux is known to report wsize as a block size (in both f_bsize
and f_frsize, both in statfs() and statvfs()). On the other hand,
typical file system block sizes on Linux (ext2/ext3/ext4, XFS) are limited
to pagesize. (With FAT, block sizes can be at least up to 512k in
extreme cases, but this doesn't really matter, see below.)
To avoid too aggressive cache clearing on NFS volumes on Linux, block
sizes larger than pagesize are now ignored.
Note that it is safe to ignore large block sizes. Since 3899:e7cd13b7f759
(1.0.1) cache size is calculated based on fstat() st_blocks, and rounding
to file system block size is preserved mostly for Windows.
Note well that on other OSes valid block sizes seen are at least up
to 65536. In particular, UFS on FreeBSD is known to work well with block
and fragment sizes set to 65536.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 22 Jun 2020 18:02:58 +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 */ |