Mercurial > hg > nginx
view src/os/unix/ngx_setproctitle.c @ 9143:48691bab4474
QUIC: fixed probe-congestion deadlock.
When probe timeout expired while congestion window was exhausted, probe PINGs
could not be sent. As a result, lost packets could not be declared lost and
congestion window could not be freed for new packets. This deadlock
continued until connection idle timeout expiration.
Now PINGs are sent separately from the frame queue without congestion control,
as specified by RFC 9002, Section 7:
An endpoint MUST NOT send a packet if it would cause bytes_in_flight
(see Appendix B.2) to be larger than the congestion window, unless the
packet is sent on a PTO timer expiration (see Section 6.2) or when entering
recovery (see Section 7.3.2).
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 14 Aug 2023 08:28:30 +0400 |
parents | 67653855682e |
children |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #if (NGX_SETPROCTITLE_USES_ENV) /* * To change the process title in Linux and Solaris we have to set argv[1] * to NULL and to copy the title to the same place where the argv[0] points to. * However, argv[0] may be too small to hold a new title. Fortunately, Linux * and Solaris store argv[] and environ[] one after another. So we should * ensure that is the continuous memory and then we allocate the new memory * for environ[] and copy it. After this we could use the memory starting * from argv[0] for our process title. * * The Solaris's standard /bin/ps does not show the changed process title. * You have to use "/usr/ucb/ps -w" instead. Besides, the UCB ps does not * show a new title if its length less than the origin command line length. * To avoid it we append to a new title the origin command line in the * parenthesis. */ extern char **environ; static char *ngx_os_argv_last; ngx_int_t ngx_init_setproctitle(ngx_log_t *log) { u_char *p; size_t size; ngx_uint_t i; size = 0; for (i = 0; environ[i]; i++) { size += ngx_strlen(environ[i]) + 1; } p = ngx_alloc(size, log); if (p == NULL) { return NGX_ERROR; } ngx_os_argv_last = ngx_os_argv[0]; for (i = 0; ngx_os_argv[i]; i++) { if (ngx_os_argv_last == ngx_os_argv[i]) { ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1; } } for (i = 0; environ[i]; i++) { if (ngx_os_argv_last == environ[i]) { size = ngx_strlen(environ[i]) + 1; ngx_os_argv_last = environ[i] + size; ngx_cpystrn(p, (u_char *) environ[i], size); environ[i] = (char *) p; p += size; } } ngx_os_argv_last--; return NGX_OK; } void ngx_setproctitle(char *title) { u_char *p; #if (NGX_SOLARIS) ngx_int_t i; size_t size; #endif ngx_os_argv[1] = NULL; p = ngx_cpystrn((u_char *) ngx_os_argv[0], (u_char *) "nginx: ", ngx_os_argv_last - ngx_os_argv[0]); p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p); #if (NGX_SOLARIS) size = 0; for (i = 0; i < ngx_argc; i++) { size += ngx_strlen(ngx_argv[i]) + 1; } if (size > (size_t) ((char *) p - ngx_os_argv[0])) { /* * ngx_setproctitle() is too rare operation so we use * the non-optimized copies */ p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p); for (i = 0; i < ngx_argc; i++) { p = ngx_cpystrn(p, (u_char *) ngx_argv[i], ngx_os_argv_last - (char *) p); p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p); } if (*(p - 1) == ' ') { *(p - 1) = ')'; } } #endif if (ngx_os_argv_last - (char *) p) { ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p); } ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "setproctitle: \"%s\"", ngx_os_argv[0]); } #endif /* NGX_SETPROCTITLE_USES_ENV */