/*	libprocstat
	Copyright 2015-2022 Rivoreo

	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 2 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.
*/

#ifndef _PROCSTAT_H
#define _PROCSTAT_H

#include <sys/types.h>
#include <stdint.h>

#define PROC_STAT_COMM_MAX_LENGTH 16

struct procstat_handle;

struct procstat {
	pid_t pid;
	pid_t ppid;
	pid_t pgid;
	pid_t tpgid;
	pid_t sid; 
	pid_t tsid;
	pid_t tgid;		// Linux-specific
	dev_t tty;
	uid_t ruid;
	uid_t euid;
	gid_t rgid;
	gid_t egid;
	size_t size;
	size_t rssize;
	uintptr_t wchan;
	uintptr_t ip;
	int is_kernel_process;
#if 0
	uint64_t user_time;
	uint64_t kernel_time;
	uint64_t child_user_time;
	uint64_t child_kernel_time;
#else
	uint64_t time;
	uint64_t child_time;
#endif
	uint64_t start_time;
	int num_threads;
	char state;
	int on_psr;
	long int priority;		// Platform-dependent
	signed char nice;		// Platform-dependent
	unsigned int rt_priority;	// Platform-dependent
	unsigned int sched_class;	// Platform-dependent
	char comm[PROC_STAT_COMM_MAX_LENGTH];
	//char command_line[0];
};

#define PROCSTAT_MAIN_THREAD_INFO (1 << 0)

#define PROCSTAT_WALK_ALL 0		/* May containing thread information on Linux */
#define PROCSTAT_WALK_THREADS 1
#define PROCSTAT_WALK_KERNEL 2
#define PROCSTAT_WALK_USER 3

struct procstat_handle *procstat_open(void);
void procstat_close(struct procstat_handle *);
int procstat_get(struct procstat_handle *, pid_t, int, struct procstat *);
int procstat_get_command_line(struct procstat_handle *, pid_t, char **);
int procstat_get_argv(struct procstat_handle *, pid_t, int *, char ***);
int procstat_get_path(struct procstat_handle *, pid_t, char **);
int procstat_get_mac_label(struct procstat_handle *, pid_t, char **);
void procstat_walk(struct procstat_handle *, int, int, int (*)(struct procstat_handle *, struct procstat *, void *), void *);

#endif