Mercurial > hg > nginx-quic
view src/os/unix/ngx_setproctitle.c @ 8867:5119c8150478
Fixed runtime handling of systems without EPOLLRDHUP support.
In 7583:efd71d49bde0 (nginx 1.17.5) along with introduction of the
ioctl(FIONREAD) support proper handling of systems without EPOLLRDHUP
support in the kernel (but with EPOLLRDHUP in headers) was broken.
Before the change, rev->available was never set to 0 unless
ngx_use_epoll_rdhup was also set (that is, runtime test for EPOLLRDHUP
introduced in 6536:f7849bfb6d21 succeeded). After the change,
rev->available might reach 0 on systems without runtime EPOLLRDHUP
support, stopping further reading in ngx_readv_chain() and ngx_unix_recv().
And, if EOF happened to be already reported along with the last event,
it is not reported again by epoll_wait(), leading to connection hangs
and timeouts on such systems.
This affects Linux kernels before 2.6.17 if nginx was compiled
with newer headers, and, more importantly, emulation layers, such as
DigitalOcean's App Platform's / gVisor's epoll emulation layer.
Fix is to explicitly check ngx_use_epoll_rdhup before the corresponding
rev->pending_eof tests in ngx_readv_chain() and ngx_unix_recv().
author | Marcus Ball <marcus.ball@live.com> |
---|---|
date | Mon, 30 May 2022 02:38:07 +0300 |
parents | 67653855682e |
children |
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/* * 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 */