X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fsocketengines%2Fsocketengine_epoll.cpp;h=7ca9da3fd8a113472d0ef3498d95247de2228c2c;hb=e2b0f3dc9ef4d56c71d7abda13e6139ca092e387;hp=68f14cc3840e7a5878097514cd28c50ed60f728f;hpb=b36ce84c7da93f680fc397bcb4c877abe063eaaa;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/socketengines/socketengine_epoll.cpp b/src/socketengines/socketengine_epoll.cpp index 68f14cc38..7ca9da3fd 100644 --- a/src/socketengines/socketengine_epoll.cpp +++ b/src/socketengines/socketengine_epoll.cpp @@ -1,8 +1,16 @@ /* * InspIRCd -- Internet Relay Chat Daemon * - * Copyright (C) 2009 Daniel De Graaf - * Copyright (C) 2007-2008 Craig Edwards + * Copyright (C) 2014-2015 Attila Molnar + * Copyright (C) 2014, 2016 Adam + * Copyright (C) 2013, 2017, 2019 Sadie Powell + * Copyright (C) 2012 Robby + * Copyright (C) 2012 Ariadne Conill + * Copyright (C) 2009-2010 Daniel De Graaf + * Copyright (C) 2008 Thomas Stagner + * Copyright (C) 2007-2008 Dennis Friis + * Copyright (C) 2006-2008 Craig Edwards + * Copyright (C) 2006, 2008 Robin Burchell * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public @@ -18,77 +26,40 @@ */ -#include -#include -#include #include "inspircd.h" -#include "exitcodes.h" -#include "socketengine.h" + #include -#include -#include -#define EP_DELAY 5 +#include /** A specialisation of the SocketEngine class, designed to use linux 2.6 epoll(). */ -class EPollEngine : public SocketEngine +namespace { -private: - /** These are used by epoll() to hold socket events - */ - struct epoll_event* events; int EngineHandle; -public: - /** Create a new EPollEngine - */ - EPollEngine(); - /** Delete an EPollEngine + + /** These are used by epoll() to hold socket events */ - virtual ~EPollEngine(); - virtual bool AddFd(EventHandler* eh, int event_mask); - virtual void OnSetEvent(EventHandler* eh, int old_mask, int new_mask); - virtual void DelFd(EventHandler* eh); - virtual int DispatchEvents(); - virtual std::string GetName(); -}; + std::vector events(16); +} -EPollEngine::EPollEngine() +void SocketEngine::Init() { - int max = ulimit(4, 0); - if (max > 0) - { - MAX_DESCRIPTORS = max; - } - else - { - ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets!"); - std::cout << "ERROR: Can't determine maximum number of open sockets!" << std::endl; - ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE); - } - - // This is not a maximum, just a hint at the eventual number of sockets that may be polled. - EngineHandle = epoll_create(GetMaxFds() / 4); + LookupMaxFds(); + // 128 is not a maximum, just a hint at the eventual number of sockets that may be polled, + // and it is completely ignored by 2.6.8 and later kernels, except it must be larger than zero. + EngineHandle = epoll_create(128); if (EngineHandle == -1) - { - ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine: %s", strerror(errno)); - ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now."); - std::cout << "ERROR: Could not initialize epoll socket engine: " << strerror(errno) << std::endl; - std::cout << "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now." << std::endl; - ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE); - } - - ref = new EventHandler* [GetMaxFds()]; - events = new struct epoll_event[GetMaxFds()]; + InitError(); +} - memset(ref, 0, GetMaxFds() * sizeof(EventHandler*)); +void SocketEngine::RecoverFromFork() +{ } -EPollEngine::~EPollEngine() +void SocketEngine::Deinit() { - this->Close(EngineHandle); - delete[] ref; - delete[] events; + Close(EngineHandle); } static unsigned mask_to_epoll(int event_mask) @@ -114,25 +85,25 @@ static unsigned mask_to_epoll(int event_mask) return rv; } -bool EPollEngine::AddFd(EventHandler* eh, int event_mask) +bool SocketEngine::AddFd(EventHandler* eh, int event_mask) { int fd = eh->GetFd(); - if ((fd < 0) || (fd > GetMaxFds() - 1)) + if (fd < 0) { - ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds()); + ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd); return false; } - if (ref[fd]) + if (!SocketEngine::AddFdRef(eh)) { ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd); return false; } struct epoll_event ev; - memset(&ev,0,sizeof(ev)); + memset(&ev, 0, sizeof(ev)); ev.events = mask_to_epoll(event_mask); - ev.data.fd = fd; + ev.data.ptr = static_cast(eh); int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev); if (i < 0) { @@ -142,13 +113,13 @@ bool EPollEngine::AddFd(EventHandler* eh, int event_mask) ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd); - ref[fd] = eh; - SocketEngine::SetEventMask(eh, event_mask); - CurrentSetSize++; + eh->SetEventMask(event_mask); + ResizeDouble(events); + return true; } -void EPollEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask) +void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask) { unsigned old_events = mask_to_epoll(old_mask); unsigned new_events = mask_to_epoll(new_mask); @@ -156,25 +127,26 @@ void EPollEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask) { // ok, we actually have something to tell the kernel about struct epoll_event ev; - memset(&ev,0,sizeof(ev)); + memset(&ev, 0, sizeof(ev)); ev.events = new_events; - ev.data.fd = eh->GetFd(); + ev.data.ptr = static_cast(eh); epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev); } } -void EPollEngine::DelFd(EventHandler* eh) +void SocketEngine::DelFd(EventHandler* eh) { int fd = eh->GetFd(); - if ((fd < 0) || (fd > GetMaxFds() - 1)) + if (fd < 0) { - ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds()); + ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd); return; } + // Do not initialize epoll_event because for EPOLL_CTL_DEL operations the event is ignored and can be NULL. + // In kernel versions before 2.6.9, the EPOLL_CTL_DEL operation required a non-NULL pointer in event, + // even though this argument is ignored. Since Linux 2.6.9, event can be specified as NULL when using EPOLL_CTL_DEL. struct epoll_event ev; - memset(&ev,0,sizeof(ev)); - ev.data.fd = fd; int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev); if (i < 0) @@ -182,49 +154,51 @@ void EPollEngine::DelFd(EventHandler* eh) ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "epoll_ctl can't remove socket: %s", strerror(errno)); } - ref[fd] = NULL; + SocketEngine::DelFdRef(eh); ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd); - CurrentSetSize--; } -int EPollEngine::DispatchEvents() +int SocketEngine::DispatchEvents() { - socklen_t codesize = sizeof(int); - int errcode; - int i = epoll_wait(EngineHandle, events, GetMaxFds() - 1, 1000); + int i = epoll_wait(EngineHandle, &events[0], events.size(), 1000); ServerInstance->UpdateTime(); - TotalEvents += i; + stats.TotalEvents += i; for (int j = 0; j < i; j++) { - EventHandler* eh = ref[events[j].data.fd]; - if (!eh) - { - ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Got event on unknown fd: %d", events[j].data.fd); - epoll_ctl(EngineHandle, EPOLL_CTL_DEL, events[j].data.fd, &events[j]); + // Copy these in case the vector gets resized and ev invalidated + const epoll_event ev = events[j]; + + EventHandler* const eh = static_cast(ev.data.ptr); + const int fd = eh->GetFd(); + if (fd < 0) continue; - } - if (events[j].events & EPOLLHUP) + + if (ev.events & EPOLLHUP) { - ErrorEvents++; - eh->HandleEvent(EVENT_ERROR, 0); + stats.ErrorEvents++; + eh->OnEventHandlerError(0); continue; } - if (events[j].events & EPOLLERR) + + if (ev.events & EPOLLERR) { - ErrorEvents++; + stats.ErrorEvents++; /* Get error number */ - if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0) + socklen_t codesize = sizeof(int); + int errcode; + if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0) errcode = errno; - eh->HandleEvent(EVENT_ERROR, errcode); + eh->OnEventHandlerError(errcode); continue; } + int mask = eh->GetEventMask(); - if (events[j].events & EPOLLIN) + if (ev.events & EPOLLIN) mask &= ~FD_READ_WILL_BLOCK; - if (events[j].events & EPOLLOUT) + if (ev.events & EPOLLOUT) { mask &= ~FD_WRITE_WILL_BLOCK; if (mask & FD_WANT_SINGLE_WRITE) @@ -234,31 +208,19 @@ int EPollEngine::DispatchEvents() mask = nm; } } - SetEventMask(eh, mask); - if (events[j].events & EPOLLIN) + eh->SetEventMask(mask); + if (ev.events & EPOLLIN) { - ReadEvents++; - eh->HandleEvent(EVENT_READ); - if (eh != ref[events[j].data.fd]) + eh->OnEventHandlerRead(); + if (eh != GetRef(fd)) // whoa! we got deleted, better not give out the write event continue; } - if (events[j].events & EPOLLOUT) + if (ev.events & EPOLLOUT) { - WriteEvents++; - eh->HandleEvent(EVENT_WRITE); + eh->OnEventHandlerWrite(); } } return i; } - -std::string EPollEngine::GetName() -{ - return "epoll"; -} - -SocketEngine* CreateSocketEngine() -{ - return new EPollEngine; -}