mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 13:33:09 +07:00
Joachim Nilsson
0d70fa4cf0
This commit adds support for calling plugin hooks when all services have been started properly. Useful for, e.g., a 3rd party service monitor to trigger further events on. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/* Plugin based services architecture for finit
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*
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* Copyright (c) 2012 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef FINIT_PLUGIN_H_
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#define FINIT_PLUGIN_H_
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#include <poll.h>
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#include <sys/queue.h> /* BSD sys/queue.h API */
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#define PLUGIN_IO_READ POLLIN
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#define PLUGIN_IO_WRITE POLLOUT
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#define PLUGIN_INIT(x) static void __attribute__ ((constructor)) x(void)
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#define PLUGIN_EXIT(x) static void __attribute__ ((destructor)) x(void)
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#define PLUGIN_ITERATOR(x) LIST_FOREACH(x, &plugins, link)
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/*
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* Predefined hook points for easier plugin debugging
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*/
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typedef enum {
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HOOK_BASEFS_UP = 0,
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HOOK_NETWORK_UP,
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HOOK_SYSTEM_UP,
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HOOK_SVC_UP,
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HOOK_SHUTDOWN,
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HOOK_MAX_NUM
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} hook_point_t;
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/**
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* plugin_t - Finit &plugin_t object
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* @link: BSD sys/queue.h linked list node
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* @name: Plugin name, or identifier to match against a &svc_t object
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* @svc: Service callback for a loaded &svc_t object
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* @hook: Hook callback definitions
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* @io: I/O hook callback
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*
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* To setup an &svc_t object callback for a service monitor the @name
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* must match the @svc_t @cmd exactly for them to "pair".
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*
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* A &plugin_t object may contain a service callback, several hooks
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* and/or an I/O callback as well. This way all critical extensions
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* to finit can fit in one single plugin, if needed.
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*
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* The "dynamic events" discussed in the svc callback is for external
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* service plugins to implement. However, it can be anything that
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* can cause a service to need to SIGHUP at runtime. E.g., acquiring
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* a DHCP lease, or an interface going UP/DOWN.
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*
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* It is up to the external service plugin to track these events and
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* relay them to each @dynamic service plugins' callback. I.e., to
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* all those with the dynamic flag set.
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*/
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typedef struct plugin {
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/* BSD sys/queue.h linked list node. */
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LIST_ENTRY(plugin) link;
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/* Plugin name, defaults to plugin path if unset.
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* NOTE: Must be same as @cmd for service plugins! */
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char *name;
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/* Service callback to be called once per lap of runloop. */
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struct plugin_svc {
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/* Private */
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int id; /* Service ID# to match this service plugin against, set on installation. */
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/* Public */
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void *arg; /* Optional argument to callback func, set by plugin. */
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int dynamic; /* Reload (SIGHUP) on dynamic event? Set by plugin. */
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int private; /* For callbacks to use freely, possibly to store "states", set by plugin. */
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int (*cb)(void *arg, int event);
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} svc;
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/* List of hook callbacks. */
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struct {
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void *arg; /* Optional argument to callback func. */
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void (*cb)(void *arg);
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} hook[HOOK_MAX_NUM];
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/* I/O Plugin */
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struct {
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int fd, flags; /* 1:READ, 2:WRITE */
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void *arg;
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void (*cb)(void *arg, int fd, int events);
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} io;
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} plugin_t;
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/* Used by svc.h */
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typedef struct plugin_svc plugin_svc_t;
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/* Public plugin API */
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int plugin_register (plugin_t *plugin);
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int plugin_unregister (plugin_t *plugin);
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#endif /* FINIT_PLUGIN_H_ */
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/**
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* Local Variables:
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* version-control: t
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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