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/* * Copyright 2011 Red Hat, Inc. * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation files * (the "Software"), to deal in the Software without restriction, * including without limitation the rights to use, copy, modify, merge, * publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef VERTO_H_ #define VERTO_H_ #include <time.h> /* For time_t */ #include <unistd.h> /* For pid_t */ #ifdef WIN32 #include <windows.h> typedef HANDLE verto_proc; typedef DWORD verto_proc_status; #else typedef pid_t verto_proc; typedef int verto_proc_status; #endif #define VERTO_SIG_IGN ((verto_callback *) 1) #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ typedef struct verto_ctx verto_ctx; typedef struct verto_ev verto_ev; typedef enum { VERTO_EV_TYPE_NONE = 0, VERTO_EV_TYPE_IO = 1, VERTO_EV_TYPE_TIMEOUT = 1 << 1, VERTO_EV_TYPE_IDLE = 1 << 2, VERTO_EV_TYPE_SIGNAL = 1 << 3, VERTO_EV_TYPE_CHILD = 1 << 4 } verto_ev_type; typedef enum { VERTO_EV_FLAG_NONE = 0, VERTO_EV_FLAG_PERSIST = 1, VERTO_EV_FLAG_PRIORITY_LOW = 1 << 1, VERTO_EV_FLAG_PRIORITY_MEDIUM = 1 << 2, VERTO_EV_FLAG_PRIORITY_HIGH = 1 << 3, VERTO_EV_FLAG_IO_READ = 1 << 4, VERTO_EV_FLAG_IO_WRITE = 1 << 5, VERTO_EV_FLAG_IO_ERROR = 1 << 7, VERTO_EV_FLAG_IO_CLOSE_FD = 1 << 8, VERTO_EV_FLAG_REINITIABLE = 1 << 6, _VERTO_EV_FLAG_MUTABLE_MASK = VERTO_EV_FLAG_PRIORITY_LOW | VERTO_EV_FLAG_PRIORITY_MEDIUM | VERTO_EV_FLAG_PRIORITY_HIGH | VERTO_EV_FLAG_IO_READ | VERTO_EV_FLAG_IO_WRITE, _VERTO_EV_FLAG_MAX = VERTO_EV_FLAG_IO_CLOSE_FD } verto_ev_flag; typedef void (verto_callback)(verto_ctx *ctx, verto_ev *ev); /** * Creates a new event context using an optionally specified implementation * and/or optionally specified required features. * * If you are an application that has already decided on using a particular * event loop implementation, you should not call this function, but instead * import the verto-NAME.h header and link against the verto-NAME.so, where * NAME is the implementation you wish to use. * * If you are a library, you should generally avoid creating event contexts * on your own but allow applications to pass in a verto_ctx you can use. * * There are two cases where you should use this function. The first is * where you have a need to choose an implementation at run time, usually * for testing purposes. The second and more common is when you simply * wish to remain implementation agnostic. In this later case, you should * always call like this: verto_new(NULL, ...). This lets verto choose the best * implementation to use. * * If impl is not NULL, a new context is returned which is backed by the * implementation specified. If the implementation specified is not * available or if the required types (reqtypes) are not provided by the * named implementation, NULL is returned. The parameter 'impl' can specify: * * The full path to an implementation library * * The name of the implementation library (i.e. - "glib" or "libev") * * If impl is NULL, verto will attempt to automatically determine the * best implementation to use. * * First, verto will attempt to use an existing, previously loaded * implementation. This is handled automatically by internal caching of either * the first implementation loaded or the one specified by verto_set_default(). * * Second, verto will attempt to discern if you are already linked to any * of the supported implementations (to avoid wasting memory by loading * extra unnecessary libraries). If you are linked to one supported * implementation, that implementation will be chosen. If you are linked * to more than one supported implementation one of the ones linked to * will be chosen, but the order of the particular choice is undefined. * * Third, verto will attempt to load the compile-time default, if defined at * build time and available at runtime. * * Last, verto will attempt to load any implementation installed. The specific * order of this step is undefined. * * In all cases above, if the implementation does not support all the specified * features (reqtypes), it will be skipped and processing will continue from * where it left off. This means that if verto_new() returns non-NULL it is * guaranteed to support the features you specified. * * @see verto_set_default() * @param impl The implementation to use, or NULL. * @param reqtypes A bitwise or'd list of required event type features. * @return A new verto_ctx, or NULL on error. Call verto_free() when done. */ verto_ctx * verto_new(const char *impl, verto_ev_type reqtypes); /** * Gets the default event context using an optionally specified implementation. * * This function is essentially a singleton version of verto_new(). However, * since this function must return the same loop as the *_default() call of * the underlying implementation (if such a function exists), it is NOT a * global singleton, but a per-implementation singleton. For this reason, you * must call verto_free() when you are done with this loop. Even after calling * verto_free() on the default verto_ctx, you can safely call verto_default() * again and receive a new reference to the same (internally default) loop. * * In all other respects, verto_default() acts exactly like verto_new(). * * @see verto_new() * @see verto_free() * @param impl The implementation to use, or NULL. * @param reqtypes A bitwise or'd list of required event type features. * @return The default verto_ctx, or NULL on error. Call verto_free() when done. */ verto_ctx * verto_default(const char *impl, verto_ev_type reqtypes); /** * Sets the default implementation to use by its name. * * This function returns 1 on success and 0 on failure. It can fail for the * following reasons: * 1. The default implementation was already set via verto_set_default(). * 2. The implementation specified could not be found. * 3. The implementation specified didn't support the features specified. * 4. The impl argument was NULL. * 5. verto_new() was already called. * 6. verto_default() was already called. * 7. verto_new_NAME() was already called. * 8. verto_default_NAME() was already called. * 9. verto_convert_NAME() was already called. * * @see verto_new() * @see verto_default() * @param impl The implementation to use. * @param reqtypes A bitwise or'd list of required event type features. * @return The default verto_ctx, or NULL on error. Call verto_free() when done. */ int verto_set_default(const char *impl, verto_ev_type reqtypes); /** * Sets the allocator to use for verto_ctx and verto_ev objects. * * If you plan to set the allocator, you MUST call this function before any * other verto_*() calls. * * @see verto_new() * @see verto_default() * @see verto_add_io() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @param resize The allocator to use (behaves like realloc()) * @param hierarchical Zero if the allocator is not hierarchical */ int verto_set_allocator(void *(*resize)(void *mem, size_t size), int hierarchical); /** * Frees a verto_ctx. * * When called on a default verto_ctx, the reference will be freed but the * internal default loop will still be available via another call to * verto_default(). * * @see verto_new() * @see verto_default() * @param ctx The verto_ctx to free. */ void verto_free(verto_ctx *ctx); /** * Run the verto_ctx forever, or at least until verto_break() is called. * * @see verto_break() * @param ctx The verto_ctx to run. */ void verto_run(verto_ctx *ctx); /** * Run the verto_ctx once. May block. * * @param ctx The verto_ctx to run once. */ void verto_run_once(verto_ctx *ctx); /** * Exits the currently running verto_ctx. * * @see verto_run() * @param ctx The verto_ctx to exit. */ void verto_break(verto_ctx *ctx); /** * Re-initializes the verto_ctx. * * This function deletes all events, except those which have set the * VERTO_EV_FLAG_REINITIABLE flag. If you fork(), you MUST call this in the * child process after the fork! * * If this function fails it indicates that at least one * VERTO_EV_FLAG_REINITIABLE event was not rearmed or that ctx was NULL. * * @see verto_new() * @see verto_default() * @param ctx The verto_ctx to re-initialize. * @return Non-zero on success, 0 on error. */ int verto_reinitialize(verto_ctx *ctx); /** * Adds a callback executed when a file descriptor is ready to be read/written. * * All verto_ev events are automatically freed when their parent verto_ctx is * freed. You do not need to free them manually. If VERTO_EV_FLAG_PERSIST is * provided, the event will repeat until verto_del() is called. If * VERTO_EV_FLAG_PERSIST is not provided, the event will be freed automatically * after its execution. In either case, you may call verto_del() at any time * to prevent the event from executing. * If VERTO_EV_FLAG_IO_CLOSE_FD is provided the passed in fd is automatically * closed when the event is freed with verto_del() * * NOTE: On Windows, the underlying select() only works with sockets. As such, * any attempt to add a non-socket io event on Windows will produce undefined * results and may even crash. * * @see verto_del() * @param ctx The verto_ctx which will fire the callback. * @param flags The flags to set (at least one VERTO_EV_FLAG_IO* required). * @param callback The callback to fire. * @param fd The file descriptor to watch for reads. * @return The verto_ev registered with the event context or NULL on error. */ verto_ev * verto_add_io(verto_ctx *ctx, verto_ev_flag flags, verto_callback *callback, int fd); /** * Adds a callback executed after a period of time. * * All verto_ev events are automatically freed when their parent verto_ctx is * freed. You do not need to free them manually. If VERTO_EV_FLAG_PERSIST is * provided, the event will repeat until verto_del() is called. If * VERTO_EV_FLAG_PERSIST is not provided, the event will be freed automatically * after its execution. In either case, you may call verto_del() at any time * to prevent the event from executing. * * @see verto_del() * @param ctx The verto_ctx which will fire the callback. * @param flags The flags to set. * @param callback The callback to fire. * @param interval Time period to wait before firing (in milliseconds). * @return The verto_ev registered with the event context. */ verto_ev * verto_add_timeout(verto_ctx *ctx, verto_ev_flag flags, verto_callback *callback, time_t interval); /** * Adds a callback executed when there is nothing else to do. * * All verto_ev events are automatically freed when their parent verto_ctx is * freed. You do not need to free them manually. If VERTO_EV_FLAG_PERSIST is * provided, the event will repeat until verto_del() is called. If * VERTO_EV_FLAG_PERSIST is not provided, the event will be freed automatically * after its execution. In either case, you may call verto_del() at any time * to prevent the event from executing. * * @see verto_del() * @param ctx The verto_ctx which will fire the callback. * @param flags The flags to set. * @param callback The callback to fire. * @return The verto_ev registered with the event context. */ verto_ev * verto_add_idle(verto_ctx *ctx, verto_ev_flag flags, verto_callback *callback); /** * Adds a callback executed when a signal is received. * * All verto_ev events are automatically freed when their parent verto_ctx is * freed. You do not need to free them manually. If VERTO_EV_FLAG_PERSIST is * provided, the event will repeat until verto_del() is called. If * VERTO_EV_FLAG_PERSIST is not provided, the event will be freed automatically * after its execution. In either case, you may call verto_del() at any time * to prevent the event from executing. * * NOTE: If you attempt to ignore a signal without the VERTO_EV_FLAG_PERSIST * flag, this function fails. * * NOTE: SIGCHLD is expressly not supported. If you want this notification, * please use verto_add_child(). * * WARNNIG: Signal events can only be reliably received in the default verto_ctx * in some implementations. Attempting to receive signal events in non-default * loops may result in assert() failures. * * WARNING: While verto does its best to protect you from crashes, there is * essentially no way to do signal events if you mix multiple implementations in * a single process. Attempting to do so will result in undefined behavior, * and potentially even a crash. You have been warned. * * @see verto_add_child() * @see verto_repeat() * @see verto_del() * @param ctx The verto_ctx which will fire the callback. * @param flags The flags to set. * @param callback The callback to fire. * @param signal The signal to watch for. * @return The verto_ev registered with the event context. */ verto_ev * verto_add_signal(verto_ctx *ctx, verto_ev_flag flags, verto_callback *callback, int signal); /** * Adds a callback executed when a child process exits. * * This event will be freed automatically after its execution. Due to the * nature of a process' life-cycle, child events cannot persist (processes only * exit once). This function returns NULL if you attempt to use * VERTO_EV_FLAG_PERSIST. You may, of course, call verto_del() at any time to * prevent the callback from firing. * * @see verto_del() * @param ctx The verto_ctx which will fire the callback. * @param flags The flags to set. * @param callback The callback to fire. * @param child The pid (POSIX) or handle (Win32) of the child to watch for. * @return The verto_ev registered with the event context. */ verto_ev * verto_add_child(verto_ctx *ctx, verto_ev_flag flags, verto_callback *callback, verto_proc proc); /** * Sets the private pointer of the verto_ev. * * The free callback will be called in two cases: * 1. When the event is deleted (manually or automatically) * 2. When verto_set_private() is called again, unless * free is NULL. * * @see verto_get_private() * @param ev The verto_ev * @param priv The private value to store * @param free The callback used to free the data or NULL */ void verto_set_private(verto_ev *ev, void *priv, verto_callback *free); /** * Gets the private pointer of the verto_ev. * * @see verto_set_private() * @param ev The verto_ev * @return The verto_ev private pointer */ void * verto_get_private(const verto_ev *ev); /** * Gets the type of the verto_ev. * * @see verto_add_io() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @param ev The verto_ev * @return The verto_ev type */ verto_ev_type verto_get_type(const verto_ev *ev); /** * Gets the flags associated with the given verto_ev. * * @see verto_add_io() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @see verto_set_flags() * @param ev The verto_ev * @return The verto_ev type */ verto_ev_flag verto_get_flags(const verto_ev *ev); /** * Sets the flags associated with the given verto_ev. * * See _VERTO_EV_FLAG_MUTABLE_MASK for the flags that can be changed * with this function. All others will be ignored. * * @see verto_add_io() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @see verto_get_flags() * @param ev The verto_ev * @param flags The flags for the event */ void verto_set_flags(verto_ev *ev, verto_ev_flag flags); /** * Gets the file descriptor associated with a read/write verto_ev. * * @see verto_add_io() * @param ev The verto_ev to retrieve the file descriptor from. * @return The file descriptor, or -1 if not a read/write event. */ int verto_get_fd(const verto_ev *ev); /** * Gets the file descriptor state from when the event fires. * * @see verto_add_io() * @param ev The verto_ev to retrieve the fd state from. * @return The fd state. */ verto_ev_flag verto_get_fd_state(const verto_ev *ev); /** * Gets the interval associated with a timeout verto_ev. * * @see verto_add_timeout() * @param ev The verto_ev to retrieve the interval from. * @return The interval, or 0 if not a timeout event. */ time_t verto_get_interval(const verto_ev *ev); /** * Gets the signal associated with a signal verto_ev. * * @see verto_add_signal() * @param ev The verto_ev to retrieve the signal from. * @return The signal, or -1 if not a signal event. */ int verto_get_signal(const verto_ev *ev); /** * Gets the process associated with a child verto_ev. * * @see verto_add_child() * @param ev The verto_ev to retrieve the process from. * @return The pid/handle, or 0/NULL if not a child event (POSIX/Win32). */ verto_proc verto_get_proc(const verto_ev *ev); /** * Gets the status of the process which caused this event to fire. * * @see verto_add_child() * @param ev The verto_ev to retrieve the status from. * @return The pid/handle status. */ verto_proc_status verto_get_proc_status(const verto_ev *ev); /** * Gets the verto_ctx associated with a verto_ev. * * This is a borrowed reference, don't attempt to free it! * * @param ev The verto_ev to retrieve the verto_ctx from. * @return The verto_ctx. */ verto_ctx * verto_get_ctx(const verto_ev *ev); /** * Removes an event from from the event context and frees it. * * The event and its contents cannot be used after this call. * * @see verto_add_io() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @param ev The event to delete. */ void verto_del(verto_ev *ev); /** * Returns the event types supported by this implementation. * * @param ctx The verto_ctx to query. * @return The event types supported. */ verto_ev_type verto_get_supported_types(verto_ctx *ctx); #ifdef __cplusplus } /* extern "C" */ #endif /* __cplusplus */ #endif /* VERTO_H_ */
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