455 lines
16 KiB
C
455 lines
16 KiB
C
/*
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* Copyright 2007-2008 Roy Marples
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __RC_H__
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#define __RC_H__
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <stdbool.h>
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#include <stdio.h>
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/* A doubly linked list using queue(3) for ease of use */
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typedef struct rc_string {
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char *value;
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TAILQ_ENTRY(rc_string) entries;
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} RC_STRING;
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typedef TAILQ_HEAD(rc_stringlist, rc_string) RC_STRINGLIST;
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/*! @name Reserved runlevel names */
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#define RC_LEVEL_SYSINIT "sysinit"
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#define RC_LEVEL_SINGLE "single"
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#define RC_LEVEL_SHUTDOWN "shutdown"
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#define RC_LEVEL_REBOOT "reboot"
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/*! Return the current runlevel.
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* @return the current runlevel */
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char *rc_runlevel_get(void);
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/*! Checks if the runlevel exists or not
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* @param runlevel to check
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* @return true if the runlevel exists, otherwise false */
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bool rc_runlevel_exists(const char *);
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/*! Return a NULL terminated list of runlevels
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* @return a NULL terminated list of runlevels */
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RC_STRINGLIST *rc_runlevel_list(void);
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/*! Set the runlevel.
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* This just changes the stored runlevel and does not start or stop any
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* services.
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* @param runlevel to store */
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bool rc_runlevel_set(const char *);
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/*! Is the runlevel starting?
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* @return true if yes, otherwise false */
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bool rc_runlevel_starting(void);
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/*! Is the runlevel stopping?
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* @return true if yes, otherwise false */
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bool rc_runlevel_stopping(void);
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/*! @name RC
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* A service can be given as a full path or just its name.
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* If its just a name then we try to resolve the service to a full path.
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* This should allow the use if local init.d directories in the future. */
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/*! @brief States a service can be in */
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typedef enum
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{
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/* These are actual states
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* The service has to be in one only at all times */
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RC_SERVICE_STOPPED = 0x0001,
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RC_SERVICE_STARTED = 0x0002,
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RC_SERVICE_STOPPING = 0x0004,
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RC_SERVICE_STARTING = 0x0008,
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RC_SERVICE_INACTIVE = 0x0010,
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/* Service may or may not have been coldplugged */
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RC_SERVICE_COLDPLUGGED = 0x0100,
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/* Optional states service could also be in */
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RC_SERVICE_FAILED = 0x0200,
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RC_SERVICE_SCHEDULED = 0x0400,
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RC_SERVICE_WASINACTIVE = 0x0800
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} RC_SERVICE;
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/*! Add the service to the runlevel
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* @param runlevel to add to
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* @param service to add
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* @return true if successful, otherwise false */
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bool rc_service_add(const char *, const char *);
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/*! Remove the service from the runlevel
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* @param runlevel to remove from
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* @param service to remove
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* @return true if sucessful, otherwise false */
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bool rc_service_delete(const char *, const char *);
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/*! Save the arguments to find a running daemon
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* @param service to save arguments for
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* @param exec that we started
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* @param name of the process (optional)
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* @param pidfile of the process (optional)
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* @param started if true, add the arguments otherwise remove existing matching arguments */
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bool rc_service_daemon_set(const char *, const char *const *, const char *, const char *,
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bool);
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/*! Returns a description of what the service and/or option does.
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* @param service to check
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* @param option to check (if NULL, service description)
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* @return a newly allocated pointer to the description */
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char *rc_service_description(const char *, const char *);
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/*! Checks if a service exists or not.
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* @param service to check
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* @return true if service exists, otherwise false */
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bool rc_service_exists(const char *);
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/*! Checks if a service is in a runlevel
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* @param service to check
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* @param runlevel it should be in
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* @return true if service is in the runlevel, otherwise false */
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bool rc_service_in_runlevel(const char *, const char *);
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/*! Marks the service state
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* @param service to mark
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* @param state service should be in
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* @return true if service state change was successful, otherwise false */
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bool rc_service_mark(const char *, RC_SERVICE);
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/*! Lists the extra commands a service has
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* @param service to load the commands from
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* @return NULL terminated string list of commands */
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RC_STRINGLIST *rc_service_extra_commands(const char *);
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/*! Resolves a service name to its full path.
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* @param service to check
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* @return pointer to full path of service */
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char *rc_service_resolve(const char *);
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/*! Schedule a service to be started when another service starts
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* @param service that starts the scheduled service when started
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* @param service_to_start service that will be started */
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bool rc_service_schedule_start(const char *, const char *);
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/*! Return a NULL terminated list of services that are scheduled to start
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* when the given service has started
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* @param service to check
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* @return NULL terminated list of services scheduled to start */
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RC_STRINGLIST *rc_services_scheduled_by(const char *);
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/*! Clear the list of services scheduled to be started by this service
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* @param service to clear
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* @return true if no errors, otherwise false */
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bool rc_service_schedule_clear(const char *);
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/*! Checks if a service in in a state
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* @param service to check
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* @return state of the service */
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RC_SERVICE rc_service_state(const char *);
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/*! Start a service
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* @param service to start
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* @return pid of the service starting process */
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pid_t rc_service_start(const char *);
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/*! Stop a service
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* @param service to stop
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* @return pid of service stopping process */
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pid_t rc_service_stop(const char *);
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/*! Check if the service started the daemon
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* @param service to check
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* @param exec to check
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* @param indx of the daemon (optional - 1st daemon, 2nd daemon, etc)
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* @return true if started by this service, otherwise false */
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bool rc_service_started_daemon(const char *, const char *const *, int);
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/*! Return a saved value for a service
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* @param service to check
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* @param option to load
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* @return saved value */
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char *rc_service_value_get(const char *, const char *);
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/*! Save a persistent value for a service
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* @param service to save for
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* @param option to save
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* @param value of the option
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* @return true if saved, otherwise false */
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bool rc_service_value_set(const char *, const char *, const char *);
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/*! List the services in a runlevel
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* @param runlevel to list
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* @return NULL terminated list of services */
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RC_STRINGLIST *rc_services_in_runlevel(const char *);
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/*! List the services in a state
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* @param state to list
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* @return NULL terminated list of services */
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RC_STRINGLIST *rc_services_in_state(RC_SERVICE);
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/*! List the services shceduled to start when this one does
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* @param service to check
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* @return NULL terminated list of services */
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RC_STRINGLIST *rc_services_scheduled(const char *);
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/*! Checks that all daemons started with start-stop-daemon by the service
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* are still running.
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* @param service to check
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* @return true if all daemons started are still running, otherwise false */
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bool rc_service_daemons_crashed(const char *);
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/*! @name System types
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* OpenRC can support some special sub system types, normally virtualization.
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* Some services cannot work in these systems, or we do something else. */
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#define RC_SYS_JAIL "JAIL"
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#define RC_SYS_OPENVZ "OPENVZ"
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#define RC_SYS_PREFIX "PREFIX"
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#define RC_SYS_UML "UML"
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#define RC_SYS_VSERVER "VSERVER"
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#define RC_SYS_XEN0 "XEN0"
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#define RC_SYS_XENU "XENU"
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const char *rc_sys(void);
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/*! @name Dependency options
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* These options can change the services found by the rc_get_depinfo and
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* rc_get_depends functions. */
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/*! Trace provided services */
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#define RC_DEP_TRACE 0x01
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/*! Only use services added to runlevels */
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#define RC_DEP_STRICT 0x02
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/*! Runlevel is starting */
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#define RC_DEP_START 0x04
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/*! Runlevel is stopping */
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#define RC_DEP_STOP 0x08
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/*! @name Dependencies
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* We analyse each init script and cache the resultant dependency tree.
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* This tree can be accessed using the below functions. */
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#ifdef _IN_LIBRC
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/*! @name Dependency structures
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* private to librc */
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/*! Singly linked list of dependency types that list the services the
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* type is for */
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typedef struct rc_deptype
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{
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/*! ineed, iuse, iafter, etc */
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char *type;
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/*! list of services */
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RC_STRINGLIST *services;
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/*! list of types */
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STAILQ_ENTRY(rc_deptype) entries;
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} RC_DEPTYPE;
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/*! Singly linked list of services and their dependencies */
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typedef struct rc_depinfo
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{
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/*! Name of service */
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char *service;
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/*! Dependencies */
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STAILQ_HEAD(, rc_deptype) depends;
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/*! List of entries */
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STAILQ_ENTRY(rc_depinfo) entries;
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} RC_DEPINFO;
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typedef STAILQ_HEAD(,rc_depinfo) RC_DEPTREE;
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#else
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/* Handles to internal structures */
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typedef void *RC_DEPTREE;
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#endif
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/*! Check to see if source is newer than target.
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* If target is a directory then we traverse it and it's children.
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* @return true if source is newer than target, otherwise false */
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bool rc_newer_than(const char *, const char *);
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/*! Update the cached dependency tree if it's older than any init script,
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* its configuration file or an external configuration file the init script
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* has specified.
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* @return true if successful, otherwise false */
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bool rc_deptree_update(void);
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/*! Check if the cached dependency tree is older than any init script,
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* its configuration file or an external configuration file the init script
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* has specified.
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* @return true if it needs updating, otherwise false */
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bool rc_deptree_update_needed(void);
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/*! Load the cached dependency tree and return a pointer to it.
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* This pointer should be freed with rc_deptree_free when done.
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* @return pointer to the dependency tree */
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RC_DEPTREE *rc_deptree_load(void);
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/*! List the depend for the type of service
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* @param deptree to search
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* @param type to use (keywords, etc)
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* @param service to check
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* @return NULL terminated list of services in order */
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RC_STRINGLIST *rc_deptree_depend(const RC_DEPTREE *, const char *, const char *);
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/*! List all the services in order that the given services have
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* for the given types and options.
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* @param deptree to search
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* @param types to use (ineed, iuse, etc)
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* @param services to check
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* @param options to pass
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* @return NULL terminated list of services in order */
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RC_STRINGLIST *rc_deptree_depends(const RC_DEPTREE *, const RC_STRINGLIST *,
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const RC_STRINGLIST *, const char *, int);
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/*! List all the services that should be stoppned and then started, in order,
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* for the given runlevel, including sysinit and boot services where
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* approriate.
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* @param deptree to search
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* @param runlevel to change into
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* @param options to pass
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* @return NULL terminated list of services in order */
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RC_STRINGLIST *rc_deptree_order(const RC_DEPTREE *, const char *, int);
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/*! Free a deptree and its information
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* @param deptree to free */
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void rc_deptree_free(RC_DEPTREE *);
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/*! @name Plugins
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* For each plugin loaded we will call rc_plugin_hook with the below
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* enum and either the runlevel name or service name.
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*
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* Plugins are called when rc does something. This does not indicate an
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* end result and the plugin should use the above functions to query things
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* like service status.
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*
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* The service hooks have extra ones - now and done. This is because after
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* start_in we may start other services before we start the service in
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* question. now shows we really will start the service now and done shows
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* when we have done it as may start scheduled services at this point. */
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/*! Points at which a plugin can hook into RC */
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typedef enum
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{
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RC_HOOK_RUNLEVEL_STOP_IN = 1,
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RC_HOOK_RUNLEVEL_STOP_OUT = 4,
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RC_HOOK_RUNLEVEL_START_IN = 5,
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RC_HOOK_RUNLEVEL_START_OUT = 8,
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/*! We send the abort if an init script requests we abort and drop
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* into single user mode if system not fully booted */
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RC_HOOK_ABORT = 99,
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RC_HOOK_SERVICE_STOP_IN = 101,
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RC_HOOK_SERVICE_STOP_NOW = 102,
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RC_HOOK_SERVICE_STOP_DONE = 103,
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RC_HOOK_SERVICE_STOP_OUT = 104,
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RC_HOOK_SERVICE_START_IN = 105,
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RC_HOOK_SERVICE_START_NOW = 106,
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RC_HOOK_SERVICE_START_DONE = 107,
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RC_HOOK_SERVICE_START_OUT = 108
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} RC_HOOK;
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/*! Plugin entry point
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* @param hook point
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* @param name of runlevel or service
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* @return 0 for success otherwise -1 */
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int rc_plugin_hook(RC_HOOK, const char *);
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/*! Plugins should write FOO=BAR to this fd to set any environment
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* variables they wish. Variables should be separated by NULLs. */
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extern FILE *rc_environ_fd;
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/*! @name Configuration
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* These functions help to deal with shell based configuration files */
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/*! Return a line from a file, stripping the trailing newline. */
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char *rc_getline(FILE *);
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/*! Return a NULL terminated list of non comment lines from a file. */
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RC_STRINGLIST *rc_config_list(const char *);
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/*! Return a NULL terminated list of key=value lines from a file. */
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RC_STRINGLIST *rc_config_load(const char *);
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/*! Return the value of the entry from a key=value list. */
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char *rc_config_value(RC_STRINGLIST *, const char *);
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/*! Check if a variable is a boolean and return it's value.
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* If variable is not a boolean then we set errno to be ENOENT when it does
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* not exist or EINVAL if it's not a boolean.
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* @param variable to check
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* @return true if it matches true, yes or 1, false if otherwise. */
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bool rc_yesno(const char *);
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/*! @name String List functions
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* Every string list should be released with a call to rc_stringlist_free. */
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/*! Create a new stringlinst
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* @return pointer to new list */
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RC_STRINGLIST *rc_stringlist_new(void);
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/*! Duplicate the item, add it to end of the list and return a pointer to it.
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* @param list to add the item too
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* @param item to add.
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* @return pointer to newly added item */
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RC_STRING *rc_stringlist_add(RC_STRINGLIST *, const char *);
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/*! If the item does not exist in the list, duplicate it, add it to the
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* list and then return a pointer to it.
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* @param list to add the item too
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* @param item to add.
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* @return pointer to newly added item */
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RC_STRING *rc_stringlist_addu(RC_STRINGLIST *, const char *);
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/*! Free the item and remove it from the list. Return 0 on success otherwise -1.
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* @param list to add the item too
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* @param item to add.
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* @return true on success, otherwise false */
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bool rc_stringlist_delete(RC_STRINGLIST *, const char *);
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/*! Sort the list according to C locale
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* @param list to sort */
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void rc_stringlist_sort(RC_STRINGLIST **);
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/*! Frees each item on the list and the list itself.
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* @param list to free */
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void rc_stringlist_free(RC_STRINGLIST *);
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typedef struct rc_pid
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{
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pid_t pid;
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LIST_ENTRY(rc_pid) entries;
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} RC_PID;
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typedef LIST_HEAD(rc_pidlist, rc_pid) RC_PIDLIST;
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/*! Find processes based on criteria.
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* All of these are optional.
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* pid overrides anything else.
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* If both exec and cmd are given then we ignore exec.
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* @param exec to check for
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* @param cmd to check for
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* @param uid to check for
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* @param pid to check for
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* @return NULL terminated list of pids */
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RC_PIDLIST *rc_find_pids(const char *const *, const char *, uid_t, pid_t);
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#endif
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