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/* SPDX-License-Identifier: ISC */
#ifndef SERVICE_H
#define SERVICE_H
#include <sys/types.h>
#include <stdint.h>
typedef struct exec_t {
struct exec_t *next;
int argc; /* number of elements in argument vector */
char args[]; /* argument vectot string blob */
} exec_t;
enum {
STATE_OFF,
STATE_RUNNING,
STATE_QUEUED,
STATE_COMPLETED,
STATE_FAILED,
};
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,
SVC_MAX
};
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_MAX
};
enum {
/* truncate stdout */
SVC_FLAG_TRUNCATE_OUT = 0x01,
SVC_FLAG_SUB_REAPER = 0x08,
SVC_FLAG_HAS_EXEC = 0x10,
};
/* persistent service configuration read from disk */
typedef struct service_t {
struct service_t *next;
char *fname; /* source file name */
char *desc; /* description string */
char *ctty; /* controlling tty or log file */
/* linked list of command lines to execute */
exec_t *exec;
char *before; /* services that must be executed later */
char *after; /* services that must be executed first */
uint32_t num_before;
uint32_t num_after;
uint16_t rspwn_limit; /* maximum respawn count */
uint16_t flags; /* SVC_FLAG_* bit field */
uint8_t type; /* SVC_* service type */
uint8_t target; /* TGT_* service target */
char name[]; /* canonical service name */
} service_t;
typedef struct {
service_t *targets[TGT_MAX];
} service_list_t;
/* run time configuration in-memory for managing services */
typedef struct {
service_t *svc; /* the underlying service description */
pid_t pid; /* if still running, the pid */
uint16_t rspwn_count; /* services respawn counter */
uint8_t state; /* what STATE_* the service is currently in */
uint8_t status; /* if exited, process exit status */
} svc_run_data_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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