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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SERVICE_H
#define SERVICE_H
#include <sys/types.h>
enum {
/*
Start the service in the background and continue with
other services. The service will eventually terminate.
*/
SVC_ONCE = 0,
SVC_WAIT, /* run service and wait until it finishes */
/*
Similar to SVC_ONCE, but restart the service when
it terminates.
*/
SVC_RESPAWN,
};
enum {
TGT_BOOT = 0, /* run service when the system boots */
TGT_SHUTDOWN, /* run service when at system shut down */
TGT_REBOOT, /* run service when during system reboot */
TGT_CAD, /* run service when CTRL+ALT+DEL is pressed */
TGT_MAX
};
typedef struct exec_t {
struct exec_t *next;
char **argv; /* NULL terminated argument vector */
char buffer[]; /* backing store for argv */
} exec_t;
typedef struct service_t {
struct service_t *next;
int type; /* SVC_* service type */
int target; /* TGT_* service target */
char *desc; /* description string */
char *ctty; /* controlling tty or log file */
int rspwn_limit; /* maximum respawn count */
/* linked list of command lines to execute */
exec_t *exec;
/* NULL terminated array of services that must be executed later */
char **before;
/* NULL terminated array of services that must be executed first */
char **after;
char *raw_before; /* backing store for 'before' contents */
char *raw_after; /* backing store for 'after' contents */
pid_t pid;
int status; /* process exit status */
char name[]; /* canonical service name */
} service_t;
typedef struct {
service_t *targets[TGT_MAX];
} service_list_t;
/*
Read a service from a file.
*/
service_t *rdsvc(int dirfd, const char *filename);
void delsvc(service_t *svc);
/*
Rebuild a service list by scanning a directory and parsing all
service descriptions.
Returns 0 on success, -1 on failure. The function takes care of
printing error messages on failure.
*/
int svcscan(const char *directory, service_list_t *list);
void del_svc_list(service_list_t *list);
/*
Sort a list of services by dependencies.
*/
service_t *svc_tsort(service_t *list);
const char *svc_type_to_string(int type);
int svc_type_from_string(const char *type);
const char *svc_target_to_string(int target);
int svc_target_from_string(const char *target);
#endif /* SERVICE_H */
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