SocketEngine Class Reference

The actual socketengine class presents the same interface on all operating systems, but its private members and internal behaviour should be treated as blackboxed, and vary from system to system and upon the config settings chosen by the server admin. More...

#include <socketengine.h>

Collaboration diagram for SocketEngine:

[legend]List of all members.

Public Member Functions
	SocketEngine ()
	Constructor The constructor transparently initializes the socket engine which the ircd is using.
	~SocketEngine ()
	Destructor The destructor transparently tidies up any resources used by the socket engine.
bool	AddFd (int fd, bool readable, char type)
	Add a file descriptor to the engine Use AddFd to add a file descriptor to the engine and have the socket engine monitor it.
char	GetType (int fd)
	Returns the type value for this file descriptor This function masks off the X_READBIT value so that the type of the socket can be obtained.
bool	DelFd (int fd)
	Delete a file descriptor f rom the engine This function call deletes a file descriptor from the engine, returning true if it succeeded and false if it failed.
bool	Wait (std::vector< int > &fdlist)
	Waits for an event.
std::string	GetName ()
	Returns the socket engines name This returns the name of the engine for use in /VERSION responses.
Private Attributes
std::vector< int >	fds
int	EngineHandle
kevent	ke_list [65535]
timespec	ts

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Detailed Description

The actual socketengine class presents the same interface on all operating systems, but its private members and internal behaviour should be treated as blackboxed, and vary from system to system and upon the config settings chosen by the server admin.

The current version supports select, epoll and kqueue.

Definition at line 66 of file socketengine.h.

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Constructor & Destructor Documentation

SocketEngine::SocketEngine (   )

Constructor The constructor transparently initializes the socket engine which the ircd is using. Please note that if there is a catastrophic failure (for example, you try and enable epoll on a 2.4 linux kernel) then this function may bail back to the shell. Definition at line 35 of file socketengine.cpp. References DEBUG, EngineHandle, and log(). { log(DEBUG,"SocketEngine::SocketEngine()"); #ifdef USE_EPOLL EngineHandle = epoll_create(65535); #endif #ifdef USE_KQUEUE EngineHandle = kqueue(); #endif }

SocketEngine::~SocketEngine (   )

Destructor The destructor transparently tidies up any resources used by the socket engine. Definition at line 46 of file socketengine.cpp. References DEBUG, EngineHandle, and log(). { log(DEBUG,"SocketEngine::~SocketEngine()"); #ifdef USE_EPOLL close(EngineHandle); #endif #ifdef USE_KQUEUE close(EngineHandle); #endif }

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Member Function Documentation

bool SocketEngine::AddFd (  int  fd, bool  readable, char  type )

Add a file descriptor to the engine Use AddFd to add a file descriptor to the engine and have the socket engine monitor it. You must provide a type (see the consts in socketengine.h) and a boolean flag to indicate wether to watch this fd for read or write events (there is currently no need for support of both). Definition at line 65 of file socketengine.cpp. References DEBUG, EngineHandle, fds, log(), ref, and X_READBIT. Referenced by InspSocket::InspSocket(), and InspSocket::Poll(). { if ((fd < 0) || (fd > 65535)) return false; this->fds.push_back(fd); ref[fd] = type; if (readable) { log(DEBUG,"Set readbit"); ref[fd] |= X_READBIT; } log(DEBUG,"Add socket %d",fd); #ifdef USE_EPOLL struct epoll_event ev; log(DEBUG,"epoll: Add socket to events, ep=%d socket=%d",EngineHandle,fd); readable ? ev.events = EPOLLIN | EPOLLET : ev.events = EPOLLOUT | EPOLLET; ev.data.fd = fd; int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev); if (i < 0) { log(DEBUG,"epoll: List insertion failure!"); return false; } #endif #ifdef USE_KQUEUE struct kevent ke; log(DEBUG,"kqueue: Add socket to events, kq=%d socket=%d",EngineHandle,fd); EV_SET(&ke, fd, readable ? EVFILT_READ : EVFILT_WRITE, EV_ADD, 0, 0, NULL); int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL); if (i == -1) { log(DEBUG,"kqueue: List insertion failure!"); return false; } #endif return true; }

bool SocketEngine::DelFd (  int  fd  )

Delete a file descriptor f rom the engine This function call deletes a file descriptor from the engine, returning true if it succeeded and false if it failed. Definition at line 103 of file socketengine.cpp. References DEBUG, EngineHandle, fds, log(), ref, and X_READBIT. Referenced by InspSocket::Poll(), and Server::UserToPseudo(). { log(DEBUG,"SocketEngine::DelFd(%d)",fd); if ((fd < 0) || (fd > 65535)) return false; bool found = false; for (std::vector<int>::iterator i = fds.begin(); i != fds.end(); i++) { if (*i == fd) { fds.erase(i); log(DEBUG,"Deleted fd %d",fd); found = true; break; } } #ifdef USE_KQUEUE struct kevent ke; EV_SET(&ke, fd, ref[fd] & X_READBIT ? EVFILT_READ : EVFILT_WRITE, EV_DELETE, 0, 0, NULL); int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL); if (i == -1) { log(DEBUG,"kqueue: Failed to remove socket from queue!"); return false; } #endif #ifdef USE_EPOLL struct epoll_event ev; ref[fd] && X_READBIT ? ev.events = EPOLLIN | EPOLLET : ev.events = EPOLLOUT | EPOLLET; ev.data.fd = fd; int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev); if (i < 0) { log(DEBUG,"epoll: List deletion failure!"); return false; } #endif ref[fd] = 0; return found; }

std::string SocketEngine::GetName (   )

Returns the socket engines name This returns the name of the engine for use in /VERSION responses. Definition at line 193 of file socketengine.cpp. { #ifdef USE_SELECT return "select"; #endif #ifdef USE_KQUEUE return "kqueue"; #endif #ifdef USE_EPOLL return "epoll"; #endif return "misconfigured"; }

char SocketEngine::GetType (  int  fd  )

Returns the type value for this file descriptor This function masks off the X_READBIT value so that the type of the socket can be obtained. The core uses this to decide where to dispatch the event to. Please note that some engines such as select() have an upper limit of 1024 descriptors which may be active at any one time, where others such as kqueue have no practical limits at all. Definition at line 57 of file socketengine.cpp. References ref, and X_EMPTY_SLOT. { if ((fd < 0) || (fd > 65535)) return X_EMPTY_SLOT; /* Mask off the top bit used for 'read/write' state */ return (ref[fd] & ~0x80); }

bool SocketEngine::Wait (  std::vector< int > &  fdlist  )

Waits for an event. Please note that this doesnt wait long, only a couple of milliseconds. It returns a list of active file descriptors in the vector fdlist which the core may then act upon. Definition at line 146 of file socketengine.cpp. References EngineHandle, fds, ke_list, ref, ts, and X_READBIT. { fdlist.clear(); #ifdef USE_SELECT FD_ZERO(&wfdset); FD_ZERO(&rfdset); timeval tval; int sresult; for (unsigned int a = 0; a < fds.size(); a++) { if (ref[fds[a]] & X_READBIT) { FD_SET (fds[a], &rfdset); } else { FD_SET (fds[a], &wfdset); } } tval.tv_sec = 0; tval.tv_usec = 100L; sresult = select(FD_SETSIZE, &rfdset, &wfdset, NULL, &tval); if (sresult > 0) { for (unsigned int a = 0; a < fds.size(); a++) { if ((FD_ISSET (fds[a], &rfdset)) || (FD_ISSET (fds[a], &wfdset))) fdlist.push_back(fds[a]); } } #endif #ifdef USE_KQUEUE ts.tv_nsec = 10000L; ts.tv_sec = 0; int i = kevent(EngineHandle, NULL, 0, &ke_list[0], 65535, &ts); for (int j = 0; j < i; j++) fdlist.push_back(ke_list[j].ident); #endif #ifdef USE_EPOLL int i = epoll_wait(EngineHandle, events, 65535, 100); for (int j = 0; j < i; j++) fdlist.push_back(events[j].data.fd); #endif return true; }

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Member Data Documentation

int SocketEngine::EngineHandle [private]

Definition at line 69 of file socketengine.h. Referenced by AddFd(), DelFd(), SocketEngine(), Wait(), and ~SocketEngine().

std::vector<int> SocketEngine::fds [private]

Definition at line 68 of file socketengine.h. Referenced by AddFd(), DelFd(), and Wait().

struct kevent SocketEngine::ke_list[65535] [private]

Definition at line 74 of file socketengine.h. Referenced by Wait().

struct timespec SocketEngine::ts [private]

Definition at line 75 of file socketengine.h. Referenced by Wait().

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The documentation for this class was generated from the following files:

• socketengine.h
• socketengine.cpp

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