X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=include%2Fsocketengine.h;h=26d31c168d1c9ff77d9847ddc8f20d7644240e79;hb=8c3c4f8e8274a598b4ba573f9eabfd0940d2e88d;hp=e34aa3941dd7d06c965f4a6a0b406393798cc68e;hpb=bab14f0dd2345c9d7dcbc47c918563709e1ac094;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/include/socketengine.h b/include/socketengine.h index e34aa3941..26d31c168 100644 --- a/include/socketengine.h +++ b/include/socketengine.h @@ -1 +1,593 @@ -/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2007 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #ifndef __SOCKETENGINE__ #define __SOCKETENGINE__ #include #include #include #include "inspircd_config.h" #include "base.h" /** Types of event an EventHandler may receive. * EVENT_READ is a readable file descriptor, * and EVENT_WRITE is a writeable file descriptor. * EVENT_ERROR can always occur, and indicates * a write error or read error on the socket, * e.g. EOF condition or broken pipe. */ enum EventType { /** Read event */ EVENT_READ = 0, /** Write event */ EVENT_WRITE = 1, /** Error event */ EVENT_ERROR = 2 }; class InspIRCd; /** This class is a basic I/O handler class. * Any object which wishes to receive basic I/O events * from the socketengine must derive from this class and * implement the HandleEvent() method. The derived class * must then be added to SocketEngine using the method * SocketEngine::AddFd(), after which point the derived * class will receive events to its HandleEvent() method. * The derived class should also implement one of Readable() * and Writeable(). In the current implementation, only * Readable() is used. If this returns true, the socketengine * inserts a readable socket. If it is false, the socketengine * inserts a writeable socket. The derived class should never * change the value this function returns without first * deleting the socket from the socket engine. The only * requirement beyond this for an event handler is that it * must have a file descriptor. What this file descriptor * is actually attached to is completely up to you. */ class CoreExport EventHandler : public Extensible { protected: /** File descriptor. * All events which can be handled * must have a file descriptor. * This allows you to add events for * sockets, fifo's, pipes, and various * other forms of IPC. */ int fd; public: /** Get the current file descriptor * @return The file descriptor of this handler */ int GetFd(); /** Set a new file desciptor * @param FD The new file descriptor. Do not * call this method without first deleting the * object from the SocketEngine if you have * added it to a SocketEngine instance. */ void SetFd(int FD); /** Constructor */ EventHandler() {} /** Destructor */ virtual ~EventHandler() {} /** Override this function to indicate readability. * @return This should return true if the function * wishes to receive EVENT_READ events. Do not change * what this function returns while the event handler * is still added to a SocketEngine instance! * If this function is unimplemented, the base class * will return true. * * NOTE: You cannot set both Readable() and * Writeable() to true. If you wish to receive * a write event for your object, you must call * SocketEngine::WantWrite() instead. This will * trigger your objects next EVENT_WRITE type event. */ virtual bool Readable(); /** Override this function to indicate writeability. * @return This should return true if the function * wishes to receive EVENT_WRITE events. Do not change * what this function returns while the event handler * is still added to a SocketEngine instance! * If this function is unimplemented, the base class * will return false. * * NOTE: You cannot set both Readable() and * Writeable() to true. If you wish to receive * a write event for your object, you must call * SocketEngine::WantWrite() instead. This will * trigger your objects next EVENT_WRITE type event. */ virtual bool Writeable(); /** Process an I/O event. * You MUST implement this function in your derived * class, and it will be called whenever read or write * events are received, depending on what your functions * Readable() and Writeable() returns and wether you * previously made a call to SocketEngine::WantWrite(). * @param et either one of EVENT_READ for read events, * and EVENT_WRITE for write events. */ virtual void HandleEvent(EventType et, int errornum = 0) = 0; #ifdef WINDOWS /** "Fake" file descriptor. This is windows-specific. */ int m_internalFd; /** Pointer to read event. We delete this so the buffer can't be used * after the socket is deleted, and so it doesn't leak memory */ void* m_readEvent; /** Pointer to a write event. */ void* m_writeEvent; /** Pointer to an accept event. */ void* m_acceptEvent; #endif }; /** Provides basic file-descriptor-based I/O support. * 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. * The configure script will enable a socket engine * based upon what OS is detected, and will derive * a class from SocketEngine based upon what it finds. * The derived classes file will also implement a * classfactory, SocketEngineFactory, which will * create a derived instance of SocketEngine using * polymorphism so that the core and modules do not * have to be aware of which SocketEngine derived * class they are using. */ class CoreExport SocketEngine : public Extensible { protected: /** Owner/Creator */ InspIRCd* ServerInstance; /** Handle to socket engine, where needed. */ int EngineHandle; /** Current number of descriptors in the engine */ int CurrentSetSize; /** Reference table, contains all current handlers */ EventHandler* ref[MAX_DESCRIPTORS]; public: /** 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. * @param Instance The creator/owner of this object */ SocketEngine(InspIRCd* Instance); /** Destructor. * The destructor transparently tidies up * any resources used by the socket engine. */ virtual ~SocketEngine(); /** Add an EventHandler object to the engine. * Use AddFd to add a file descriptor to the * engine and have the socket engine monitor * it. You must provide an object derived from * EventHandler which implements HandleEvent() * and optionally Readable() and Writeable(). * @param eh An event handling object to add */ virtual bool AddFd(EventHandler* eh); /** If you call this function and pass it an * event handler, that event handler will * receive the next available write event, * even if the socket is a readable socket only. * Developers should avoid constantly keeping * an eventhandler in the writeable state, * as this will consume large amounts of * CPU time. * @param eh An event handler which wants to * receive the next writeability event. */ virtual void WantWrite(EventHandler* eh); /** Returns the maximum number of file descriptors * you may store in the socket engine at any one time. * @return The maximum fd value */ virtual int GetMaxFds(); /** Returns the number of file descriptor slots * which are available for storing fds. * @return The number of remaining fd's */ virtual int GetRemainingFds(); /** Delete an event handler from the engine. * This function call deletes an EventHandler * from the engine, returning true if it succeeded * and false if it failed. This does not free the * EventHandler pointer using delete, if this is * required you must do this yourself. * Note on forcing deletes. DO NOT DO THIS! This is * extremely dangerous and will most likely render the * socketengine dead. This was added only for handling * very rare cases where broken 3rd party libs destroys * the OS socket beyond our control. If you can't explain * in minute details why forcing is absolutely necessary * then you don't need it. That was a NO! * @param eh The event handler object to remove * @param force *DANGEROUS* See method description! * @return True if the event handler was removed */ virtual bool DelFd(EventHandler* eh, bool force = false); /** Returns true if a file descriptor exists in * the socket engine's list. * @param fd The event handler to look for * @return True if this fd has an event handler */ virtual bool HasFd(int fd); /** Returns the EventHandler attached to a specific fd. * If the fd isnt in the socketengine, returns NULL. * @param fd The event handler to look for * @return A pointer to the event handler, or NULL */ virtual EventHandler* GetRef(int fd); /** Waits for events and dispatches them to handlers. * Please note that this doesnt wait long, only * a couple of milliseconds. It returns the number of * events which occured during this call. * This method will dispatch events to their handlers * by calling their EventHandler::HandleEvent() * methods with the neccessary EventType value. * @return The number of events which have occured. */ virtual int DispatchEvents(); /** Returns the socket engines name. * This returns the name of the engine for use * in /VERSION responses. * @return The socket engine name */ virtual std::string GetName(); }; #endif \ No newline at end of file +/* + * InspIRCd -- Internet Relay Chat Daemon + * + * Copyright (C) 2013-2016 Attila Molnar + * Copyright (C) 2013-2014 Adam + * Copyright (C) 2012-2013, 2017-2020 Sadie Powell + * Copyright (C) 2012 Robby + * Copyright (C) 2009-2010 Daniel De Graaf + * Copyright (C) 2009 Uli Schlachter + * Copyright (C) 2007-2008, 2017 Robin Burchell + * Copyright (C) 2007 Dennis Friis + * Copyright (C) 2005-2008 Craig Edwards + * + * 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 + * License as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + + +#pragma once + +#include +#include "socket.h" +#include "base.h" + +#ifndef _WIN32 +#include +#endif + +#ifndef IOV_MAX +#define IOV_MAX 1024 +#endif + +/** + * Event mask for SocketEngine events + */ +enum EventMask +{ + /** Do not test this socket for readability + */ + FD_WANT_NO_READ = 0x1, + /** Give a read event at all times when reads will not block. + */ + FD_WANT_POLL_READ = 0x2, + /** Give a read event when there is new data to read. + * + * An event MUST be sent if there is new data to be read, and the most + * recent read/recv() on this FD returned EAGAIN. An event MAY be sent + * at any time there is data to be read on the socket. + */ + FD_WANT_FAST_READ = 0x4, + /** Give an optional read event when reads begin to unblock + * + * This state is useful if you want to leave data in the OS receive + * queue but not get continuous event notifications about it, because + * it may not require a system call to transition from FD_WANT_FAST_READ + */ + FD_WANT_EDGE_READ = 0x8, + + /** Mask for all read events */ + FD_WANT_READ_MASK = 0x0F, + + /** Do not test this socket for writeability + */ + FD_WANT_NO_WRITE = 0x10, + /** Give a write event at all times when writes will not block. + * + * You probably shouldn't use this state; if it's likely that the write + * will not block, try it first, then use FD_WANT_FAST_WRITE if it + * fails. If it's likely to block (or you are using polling-style reads) + * then use FD_WANT_SINGLE_WRITE. + */ + FD_WANT_POLL_WRITE = 0x20, + /** Give a write event when writes don't block any more + * + * An event MUST be sent if writes will not block, and the most recent + * write/send() on this FD returned EAGAIN, or connect() returned + * EINPROGRESS. An event MAY be sent at any time that writes will not + * block. + * + * Before calling OnEventHandler*(), a socket engine MAY change the state of + * the FD back to FD_WANT_EDGE_WRITE if it is simpler (for example, if a + * one-shot notification was registered). If further writes are needed, + * it is the responsibility of the event handler to change the state to + * one that will generate the required notifications + */ + FD_WANT_FAST_WRITE = 0x40, + /** Give an optional write event on edge-triggered write unblock. + * + * This state is useful to avoid system calls when moving to/from + * FD_WANT_FAST_WRITE when writing data to a mostly-unblocked socket. + */ + FD_WANT_EDGE_WRITE = 0x80, + /** Request a one-shot poll-style write notification. The socket will + * return to the FD_WANT_NO_WRITE state before OnEventHandler*() is called. + */ + FD_WANT_SINGLE_WRITE = 0x100, + + /** Mask for all write events */ + FD_WANT_WRITE_MASK = 0x1F0, + + /** Add a trial read. During the next DispatchEvents invocation, this + * will call OnEventHandlerRead() unless reads are known to be + * blocking. + */ + FD_ADD_TRIAL_READ = 0x1000, + /** Assert that reads are known to block. This cancels FD_ADD_TRIAL_READ. + * Reset by SE before running OnEventHandlerRead(). + */ + FD_READ_WILL_BLOCK = 0x2000, + + /** Add a trial write. During the next DispatchEvents invocation, this + * will call OnEventHandlerWrite() unless writes are known to be + * blocking. + * + * This could be used to group several writes together into a single + * send() syscall, or to ensure that writes are blocking when attempting + * to use FD_WANT_FAST_WRITE. + */ + FD_ADD_TRIAL_WRITE = 0x4000, + /** Assert that writes are known to block. This cancels FD_ADD_TRIAL_WRITE. + * Reset by SE before running OnEventHandlerWrite(). + */ + FD_WRITE_WILL_BLOCK = 0x8000, + + /** Mask for trial read/trial write */ + FD_TRIAL_NOTE_MASK = 0x5000 +}; + +/** This class is a basic I/O handler class. + * Any object which wishes to receive basic I/O events + * from the socketengine must derive from this class and + * implement the OnEventHandler*() methods. The derived class + * must then be added to SocketEngine using the method + * SocketEngine::AddFd(), after which point the derived + * class will receive events to its OnEventHandler*() methods. + * The event mask passed to SocketEngine::AddFd() determines + * what events the EventHandler gets notified about and with + * what semantics. SocketEngine::ChangeEventMask() can be + * called to update the event mask later. The only + * requirement beyond this for an event handler is that it + * must have a file descriptor. What this file descriptor + * is actually attached to is completely up to you. + */ +class CoreExport EventHandler : public classbase +{ + private: + /** Private state maintained by socket engine */ + int event_mask; + + void SetEventMask(int mask) { event_mask = mask; } + + protected: + /** File descriptor. + * All events which can be handled must have a file descriptor. This + * allows you to add events for sockets, fifo's, pipes, and various + * other forms of IPC. Do not change this while the object is + * registered with the SocketEngine + */ + int fd; + + /** Swaps the internals of this EventHandler with another one. + * @param other A EventHandler to swap internals with. + */ + void SwapInternals(EventHandler& other); + + public: + /** Get the current file descriptor + * @return The file descriptor of this handler + */ + inline int GetFd() const { return fd; } + + /** Checks if this event handler has a fd associated with it. */ + inline bool HasFd() const { return fd >= 0; } + + inline int GetEventMask() const { return event_mask; } + + /** Set a new file descriptor + * @param FD The new file descriptor. Do not call this method without + * first deleting the object from the SocketEngine if you have + * added it to a SocketEngine instance. + */ + void SetFd(int FD); + + /** Constructor + */ + EventHandler(); + + /** Destructor + */ + virtual ~EventHandler() {} + + /** Called by the socket engine in case of a read event + */ + virtual void OnEventHandlerRead() = 0; + + /** Called by the socket engine in case of a write event. + * The default implementation does nothing. + */ + virtual void OnEventHandlerWrite(); + + /** Called by the socket engine in case of an error event. + * The default implementation does nothing. + * @param errornum Error code + */ + virtual void OnEventHandlerError(int errornum); + + friend class SocketEngine; +}; + +/** Provides basic file-descriptor-based I/O support. + * 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. + */ +class CoreExport SocketEngine +{ + public: + /** Socket engine statistics: count of various events, bandwidth usage + */ + class Statistics + { + mutable size_t indata; + mutable size_t outdata; + mutable time_t lastempty; + + /** Reset the byte counters and lastempty if there wasn't a reset in this second. + */ + void CheckFlush() const; + + public: + /** Constructor, initializes member vars except indata and outdata because those are set to 0 + * in CheckFlush() the first time Update() or GetBandwidth() is called. + */ + Statistics() : lastempty(0), TotalEvents(0), ReadEvents(0), WriteEvents(0), ErrorEvents(0) { } + + /** Update counters for network data received. + * This should be called after every read-type syscall. + * @param len_in Number of bytes received, or -1 for error, as typically + * returned by a read-style syscall. + */ + void UpdateReadCounters(int len_in); + + /** Update counters for network data sent. + * This should be called after every write-type syscall. + * @param len_out Number of bytes sent, or -1 for error, as typically + * returned by a read-style syscall. + */ + void UpdateWriteCounters(int len_out); + + /** Get data transfer statistics. + * @param kbitpersec_in Filled with incoming traffic in this second in kbit/s. + * @param kbitpersec_out Filled with outgoing traffic in this second in kbit/s. + * @param kbitpersec_total Filled with total traffic in this second in kbit/s. + */ + void CoreExport GetBandwidth(float& kbitpersec_in, float& kbitpersec_out, float& kbitpersec_total) const; + + unsigned long TotalEvents; + unsigned long ReadEvents; + unsigned long WriteEvents; + unsigned long ErrorEvents; + }; + + private: + /** Reference table, contains all current handlers + **/ + static std::vector ref; + + /** Current number of descriptors in the engine. */ + static size_t CurrentSetSize; + + /** The maximum number of descriptors in the engine. */ + static size_t MaxSetSize; + + /** List of handlers that want a trial read/write + */ + static std::set trials; + + /** Socket engine statistics: count of various events, bandwidth usage + */ + static Statistics stats; + + /** Look up the fd limit using rlimit. */ + static void LookupMaxFds(); + + /** Terminates the program when the socket engine fails to initialize. */ + static void InitError(); + + static void OnSetEvent(EventHandler* eh, int old_mask, int new_mask); + + /** Add an event handler to the base socket engine. AddFd(EventHandler*, int) should call this. + */ + static bool AddFdRef(EventHandler* eh); + + static void DelFdRef(EventHandler* eh); + + template + static void ResizeDouble(std::vector& vect) + { + if (SocketEngine::CurrentSetSize > vect.size()) + vect.resize(SocketEngine::CurrentSetSize * 2); + } + +public: +#ifndef _WIN32 + typedef iovec IOVector; +#else + typedef WindowsIOVec IOVector; +#endif + + /** 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. + * @return void, but it is acceptable for this function to bail back to + * the shell or operating system on fatal error. + */ + static void Init(); + + /** Destructor. + * The destructor transparently tidies up + * any resources used by the socket engine. + */ + static void Deinit(); + + /** Add an EventHandler object to the engine. Use AddFd to add a file + * descriptor to the engine and have the socket engine monitor it. You + * must provide an object derived from EventHandler which implements + * the required OnEventHandler*() methods. + * @param eh An event handling object to add + * @param event_mask The initial event mask for the object + */ + static bool AddFd(EventHandler* eh, int event_mask); + + /** If you call this function and pass it an + * event handler, that event handler will + * receive the next available write event, + * even if the socket is a readable socket only. + * Developers should avoid constantly keeping + * an eventhandler in the writeable state, + * as this will consume large amounts of + * CPU time. + * @param eh The event handler to change + * @param event_mask The changes to make to the wait state + */ + static void ChangeEventMask(EventHandler* eh, int event_mask); + + /** Returns the number of file descriptors reported by the system this program may use + * when it was started. + * @return If non-zero the number of file descriptors that the system reported that we + * may use. + */ + static size_t GetMaxFds() { return MaxSetSize; } + + /** Returns the number of file descriptors being queried + * @return The set size + */ + static size_t GetUsedFds() { return CurrentSetSize; } + + /** Delete an event handler from the engine. + * This function call deletes an EventHandler + * from the engine, returning true if it succeeded + * and false if it failed. This does not free the + * EventHandler pointer using delete, if this is + * required you must do this yourself. + * @param eh The event handler object to remove + */ + static void DelFd(EventHandler* eh); + + /** Returns true if a file descriptor exists in + * the socket engine's list. + * @param fd The event handler to look for + * @return True if this fd has an event handler + */ + static bool HasFd(int fd); + + /** Returns the EventHandler attached to a specific fd. + * If the fd isn't in the socketengine, returns NULL. + * @param fd The event handler to look for + * @return A pointer to the event handler, or NULL + */ + static EventHandler* GetRef(int fd); + + /** Waits for events and dispatches them to handlers. Please note that + * this doesn't wait long, only a couple of milliseconds. It returns the + * number of events which occurred during this call. This method will + * dispatch events to their handlers by calling their + * EventHandler::OnEventHandler*() methods. + * @return The number of events which have occurred. + */ + static int DispatchEvents(); + + /** Dispatch trial reads and writes. This causes the actual socket I/O + * to happen when writes have been pre-buffered. + */ + static void DispatchTrialWrites(); + + /** Returns true if the file descriptors in the given event handler are + * within sensible ranges which can be handled by the socket engine. + */ + static bool BoundsCheckFd(EventHandler* eh); + + /** Abstraction for BSD sockets accept(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param addr The client IP address and port + * @param addrlen The size of the sockaddr parameter. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Accept(EventHandler* fd, sockaddr *addr, socklen_t *addrlen); + + /** Close the underlying fd of an event handler, remove it from the socket engine and set the fd to -1. + * @param eh The EventHandler to close. + * @return 0 on success, a negative value on error + */ + static int Close(EventHandler* eh); + + /** Abstraction for BSD sockets close(2). + * This function should emulate its namesake system call exactly. + * This function should emulate its namesake system call exactly. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Close(int fd); + + /** Abstraction for BSD sockets send(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param buf The buffer in which the data that is sent is stored. + * @param len The size of the buffer. + * @param flags A flag value that controls the sending of the data. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Send(EventHandler* fd, const void *buf, size_t len, int flags); + + /** Abstraction for vector write function writev(). + * This function should emulate its namesake system call exactly. + * @param fd EventHandler to send data with + * @param iov Array of IOVectors containing the buffers to send and their lengths in the platform's + * native format. + * @param count Number of elements in iov. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int WriteV(EventHandler* fd, const IOVector* iov, int count); + +#ifdef _WIN32 + /** Abstraction for vector write function writev() that accepts a POSIX format iovec. + * This function should emulate its namesake system call exactly. + * @param fd EventHandler to send data with + * @param iov Array of iovecs containing the buffers to send and their lengths in POSIX format. + * @param count Number of elements in iov. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int WriteV(EventHandler* fd, const iovec* iov, int count); +#endif + + /** Abstraction for BSD sockets recv(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param buf The buffer in which the data that is read is stored. + * @param len The size of the buffer. + * @param flags A flag value that controls the reception of the data. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Recv(EventHandler* fd, void *buf, size_t len, int flags); + + /** Abstraction for BSD sockets recvfrom(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param buf The buffer in which the data that is read is stored. + * @param len The size of the buffer. + * @param flags A flag value that controls the reception of the data. + * @param from The remote IP address and port. + * @param fromlen The size of the from parameter. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int RecvFrom(EventHandler* fd, void *buf, size_t len, int flags, sockaddr *from, socklen_t *fromlen); + + /** Abstraction for BSD sockets sendto(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param buf The buffer in which the data that is sent is stored. + * @param len The size of the buffer. + * @param flags A flag value that controls the sending of the data. + * @param address The remote IP address and port. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int SendTo(EventHandler* fd, const void* buf, size_t len, int flags, const irc::sockets::sockaddrs& address); + + /** Abstraction for BSD sockets connect(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param address The server IP address and port. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Connect(EventHandler* fd, const irc::sockets::sockaddrs& address); + + /** Make a file descriptor blocking. + * @param fd a file descriptor to set to blocking mode + * @return 0 on success, -1 on failure, errno is set appropriately. + */ + static int Blocking(int fd); + + /** Make a file descriptor nonblocking. + * @param fd A file descriptor to set to nonblocking mode + * @return 0 on success, -1 on failure, errno is set appropriately. + */ + static int NonBlocking(int fd); + + /** Abstraction for BSD sockets shutdown(2). + * This function should emulate its namesake system call exactly. + * @param fd This version of the call takes an EventHandler instead of a bare file descriptor. + * @param how What part of the socket to shut down + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Shutdown(EventHandler* fd, int how); + + /** Abstraction for BSD sockets shutdown(2). + * This function should emulate its namesake system call exactly. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Shutdown(int fd, int how); + + /** Abstraction for BSD sockets bind(2). + * This function should emulate its namesake system call exactly. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Bind(int fd, const irc::sockets::sockaddrs& addr); + + /** Abstraction for BSD sockets listen(2). + * This function should emulate its namesake system call exactly. + * @return This method should return exactly the same values as the system call it emulates. + */ + static int Listen(int sockfd, int backlog); + + /** Set SO_REUSEADDR and SO_LINGER on this file descriptor + */ + static void SetReuse(int sockfd); + + /** This function is called immediately after fork(). + * Some socket engines (notably kqueue) cannot have their + * handles inherited by forked processes. This method + * allows for the socket engine to re-create its handle + * after the daemon forks as the socket engine is created + * long BEFORE the daemon forks. + * @return void, but it is acceptable for this function to bail back to + * the shell or operating system on fatal error. + */ + static void RecoverFromFork(); + + /** Get data transfer and event statistics + */ + static const Statistics& GetStats() { return stats; } + + /** Should we ignore the error in errno? + * Checks EAGAIN and WSAEWOULDBLOCK + */ + static bool IgnoreError(); + + /** Return the last socket related error. strrerror(errno) on *nix + */ + static std::string LastError(); + + /** Returns the error for the given error num, strerror(errnum) on *nix + */ + static std::string GetError(int errnum); +}; + +inline bool SocketEngine::IgnoreError() +{ + if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) + return true; + +#ifdef _WIN32 + if (WSAGetLastError() == WSAEWOULDBLOCK) + return true; +#endif + + return false; +}