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File: verto-module.h
/*
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* Copyright 2011 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*** THE FOLLOWING ARE FOR IMPLEMENTATION MODULES ONLY ***/
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#ifndef VERTO_MODULE_H_
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#define VERTO_MODULE_H_
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#include <verto.h>
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#ifndef VERTO_MODULE_TYPES
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#define VERTO_MODULE_TYPES
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typedef void verto_mod_ctx;
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typedef void verto_mod_ev;
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#endif
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#define VERTO_MODULE_VERSION 3
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#define VERTO_MODULE_TABLE(name) verto_module_table_ ## name
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#define VERTO_MODULE(name, symb, types) \
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static verto_ctx_funcs name ## _funcs = { \
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name ## _ctx_new, \
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name ## _ctx_default, \
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name ## _ctx_free, \
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name ## _ctx_run, \
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name ## _ctx_run_once, \
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name ## _ctx_break, \
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name ## _ctx_reinitialize, \
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name ## _ctx_set_flags, \
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name ## _ctx_add, \
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name ## _ctx_del \
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}; \
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verto_module VERTO_MODULE_TABLE(name) = { \
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VERTO_MODULE_VERSION, \
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# name, \
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# symb, \
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types, \
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&name ## _funcs, \
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}; \
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verto_ctx * \
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verto_new_ ## name() \
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{ \
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return verto_convert(name, 0, NULL); \
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} \
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verto_ctx * \
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verto_default_ ## name() \
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{ \
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return verto_convert(name, 1, NULL); \
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}
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typedef struct {
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/* Required */ verto_mod_ctx *(*ctx_new)();
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/* Optional */ verto_mod_ctx *(*ctx_default)();
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/* Required */ void (*ctx_free)(verto_mod_ctx *ctx);
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/* Optional */ void (*ctx_run)(verto_mod_ctx *ctx);
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/* Required */ void (*ctx_run_once)(verto_mod_ctx *ctx);
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/* Optional */ void (*ctx_break)(verto_mod_ctx *ctx);
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/* Optional */ void (*ctx_reinitialize)(verto_mod_ctx *ctx);
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/* Optional */ void (*ctx_set_flags)(verto_mod_ctx *ctx,
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const verto_ev *ev,
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verto_mod_ev *modev);
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/* Required */ verto_mod_ev *(*ctx_add)(verto_mod_ctx *ctx,
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const verto_ev *ev,
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verto_ev_flag *flags);
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/* Required */ void (*ctx_del)(verto_mod_ctx *ctx,
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const verto_ev *ev,
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verto_mod_ev *modev);
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} verto_ctx_funcs;
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typedef struct {
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unsigned int vers;
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const char *name;
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const char *symb;
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verto_ev_type types;
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verto_ctx_funcs *funcs;
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} verto_module;
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/**
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* Converts an existing implementation specific loop to a verto_ctx.
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*
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* This function also sets the internal default implementation so that future
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* calls to verto_new(NULL) or verto_default(NULL) will use this specific
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* implementation if it was not already set.
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*
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* @param name The name of the module (unquoted)
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* @param deflt Whether the ctx is the default context or not
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* @param ctx The context to store
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* @return A new verto_ctx, or NULL on error. Call verto_free() when done.
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*/
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#define verto_convert(name, deflt, ctx) \
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verto_convert_module(&VERTO_MODULE_TABLE(name), deflt, ctx)
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/**
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* Converts an existing implementation specific loop to a verto_ctx.
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*
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* If you are a module implementation, you probably want the macro above. This
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* function is generally used directly only when an application is attempting
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* to expose a home-grown event loop to verto.
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*
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* If deflt is non-zero and a default ctx was already defined for this module
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* and ctx is not NULL, than ctx will be free'd and the previously defined
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* default will be returned.
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*
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* If ctx is non-NULL, than the pre-existing verto_mod_ctx will be converted to
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* to a verto_ctx; if deflt is non-zero than this verto_mod_ctx will also be
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* marked as the default loop for this process. If ctx is NULL, than the
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* appropriate constructor will be called: either module->ctx_new() or
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* module->ctx_default() depending on the boolean value of deflt. If
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* module->ctx_default is NULL and deflt is non-zero, than module->ctx_new()
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* will be called and the resulting verto_mod_ctx will be utilized as the
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* default.
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*
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* This function also sets the internal default implementation so that future
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* calls to verto_new(NULL) or verto_default(NULL) will use this specific
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* implementation if it was not already set.
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*
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* @param name The name of the module (unquoted)
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* @param ctx The context private to store
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* @return A new verto_ctx, or NULL on error. Call verto_free() when done.
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*/
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verto_ctx *
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verto_convert_module(const verto_module *module, int deflt, verto_mod_ctx *ctx);
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/**
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* Calls the callback of the verto_ev and then frees it via verto_del().
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*
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* The verto_ev is not freed (verto_del() is not called) if it is a signal event.
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*
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* @see verto_add_read()
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* @see verto_add_write()
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* @see verto_add_timeout()
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* @see verto_add_idle()
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* @see verto_add_signal()
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* @see verto_add_child()
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* @see verto_del()
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* @param ev The verto_ev
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*/
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void
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verto_fire(verto_ev *ev);
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/**
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* Sets the status of the pid/handle which caused this event to fire.
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*
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* This function does nothing if the verto_ev is not a child type.
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*
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* @see verto_add_child()
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* @param ev The verto_ev to set the status in.
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* @param status The pid/handle status.
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*/
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void
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verto_set_proc_status(verto_ev *ev, verto_proc_status status);
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/**
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* Sets the state of the fd which caused this event to fire.
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*
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* This function does nothing if the verto_ev is not a io type.
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*
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* Only the flags VERTO_EV_FLAG_IO_(READ|WRITE|ERROR) are supported. All other
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* flags are unset.
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*
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* @see verto_add_io()
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* @param ev The verto_ev to set the state in.
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* @param state The fd state.
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*/
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void
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verto_set_fd_state(verto_ev *ev, verto_ev_flag state);
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#endif /* VERTO_MODULE_H_ */
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