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verto-module.h
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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. */ /*** THE FOLLOWING ARE FOR IMPLEMENTATION MODULES ONLY ***/ #ifndef VERTO_MODULE_H_ #define VERTO_MODULE_H_ #include <verto.h> #ifndef VERTO_MODULE_TYPES #define VERTO_MODULE_TYPES typedef void verto_mod_ctx; typedef void verto_mod_ev; #endif #define VERTO_MODULE_VERSION 3 #define VERTO_MODULE_TABLE(name) verto_module_table_ ## name #define VERTO_MODULE(name, symb, types) \ static verto_ctx_funcs name ## _funcs = { \ name ## _ctx_new, \ name ## _ctx_default, \ name ## _ctx_free, \ name ## _ctx_run, \ name ## _ctx_run_once, \ name ## _ctx_break, \ name ## _ctx_reinitialize, \ name ## _ctx_set_flags, \ name ## _ctx_add, \ name ## _ctx_del \ }; \ verto_module VERTO_MODULE_TABLE(name) = { \ VERTO_MODULE_VERSION, \ # name, \ # symb, \ types, \ &name ## _funcs, \ }; \ verto_ctx * \ verto_new_ ## name() \ { \ return verto_convert(name, 0, NULL); \ } \ verto_ctx * \ verto_default_ ## name() \ { \ return verto_convert(name, 1, NULL); \ } typedef struct { /* Required */ verto_mod_ctx *(*ctx_new)(); /* Optional */ verto_mod_ctx *(*ctx_default)(); /* Required */ void (*ctx_free)(verto_mod_ctx *ctx); /* Optional */ void (*ctx_run)(verto_mod_ctx *ctx); /* Required */ void (*ctx_run_once)(verto_mod_ctx *ctx); /* Optional */ void (*ctx_break)(verto_mod_ctx *ctx); /* Optional */ void (*ctx_reinitialize)(verto_mod_ctx *ctx); /* Optional */ void (*ctx_set_flags)(verto_mod_ctx *ctx, const verto_ev *ev, verto_mod_ev *modev); /* Required */ verto_mod_ev *(*ctx_add)(verto_mod_ctx *ctx, const verto_ev *ev, verto_ev_flag *flags); /* Required */ void (*ctx_del)(verto_mod_ctx *ctx, const verto_ev *ev, verto_mod_ev *modev); } verto_ctx_funcs; typedef struct { unsigned int vers; const char *name; const char *symb; verto_ev_type types; verto_ctx_funcs *funcs; } verto_module; /** * Converts an existing implementation specific loop to a verto_ctx. * * This function also sets the internal default implementation so that future * calls to verto_new(NULL) or verto_default(NULL) will use this specific * implementation if it was not already set. * * @param name The name of the module (unquoted) * @param deflt Whether the ctx is the default context or not * @param ctx The context to store * @return A new verto_ctx, or NULL on error. Call verto_free() when done. */ #define verto_convert(name, deflt, ctx) \ verto_convert_module(&VERTO_MODULE_TABLE(name), deflt, ctx) /** * Converts an existing implementation specific loop to a verto_ctx. * * If you are a module implementation, you probably want the macro above. This * function is generally used directly only when an application is attempting * to expose a home-grown event loop to verto. * * If deflt is non-zero and a default ctx was already defined for this module * and ctx is not NULL, than ctx will be free'd and the previously defined * default will be returned. * * If ctx is non-NULL, than the pre-existing verto_mod_ctx will be converted to * to a verto_ctx; if deflt is non-zero than this verto_mod_ctx will also be * marked as the default loop for this process. If ctx is NULL, than the * appropriate constructor will be called: either module->ctx_new() or * module->ctx_default() depending on the boolean value of deflt. If * module->ctx_default is NULL and deflt is non-zero, than module->ctx_new() * will be called and the resulting verto_mod_ctx will be utilized as the * default. * * This function also sets the internal default implementation so that future * calls to verto_new(NULL) or verto_default(NULL) will use this specific * implementation if it was not already set. * * @param name The name of the module (unquoted) * @param ctx The context private to store * @return A new verto_ctx, or NULL on error. Call verto_free() when done. */ verto_ctx * verto_convert_module(const verto_module *module, int deflt, verto_mod_ctx *ctx); /** * Calls the callback of the verto_ev and then frees it via verto_del(). * * The verto_ev is not freed (verto_del() is not called) if it is a signal event. * * @see verto_add_read() * @see verto_add_write() * @see verto_add_timeout() * @see verto_add_idle() * @see verto_add_signal() * @see verto_add_child() * @see verto_del() * @param ev The verto_ev */ void verto_fire(verto_ev *ev); /** * Sets the status of the pid/handle which caused this event to fire. * * This function does nothing if the verto_ev is not a child type. * * @see verto_add_child() * @param ev The verto_ev to set the status in. * @param status The pid/handle status. */ void verto_set_proc_status(verto_ev *ev, verto_proc_status status); /** * Sets the state of the fd which caused this event to fire. * * This function does nothing if the verto_ev is not a io type. * * Only the flags VERTO_EV_FLAG_IO_(READ|WRITE|ERROR) are supported. All other * flags are unset. * * @see verto_add_io() * @param ev The verto_ev to set the state in. * @param state The fd state. */ void verto_set_fd_state(verto_ev *ev, verto_ev_flag state); #endif /* VERTO_MODULE_H_ */
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