Orion

#ifndef KERNEL_TASK_H
#define KERNEL_TASK_H

#include <stdint.h>
#include <sys/ipc.h>
#include <sys/times.h>
#include <time.h>
#include <signal.h>
#include "signal.h"
#include "../mem/paging.h"
#include "../mem/vm.h"
#include "../proc/proc.h"
#include "../vfs/vfs.h"
#include "../spinlock.h"

typedef struct Task Task;
typedef struct TaskQueue TaskQueue;

/* Process priorities */
enum Priority {
	NONE,
	LOWEST,
	LOW,
	NORMAL,
	HIGH,
	HIGHEST,
};

/* Task states */
enum States {
	RUNNING,
	READY,
	TERMINATED,
	WAITING_FOR_CHILD,
	WAITING_FOR_IO,
	SLEEP,
};

/* Structure for a Task Queue */
struct TaskQueue {
	Task *start, *end;
	Spinlock lock;
};

/* Structure of a Task */
struct Task {
	pid_t tid, tgid;
	uid_t uid, euid, suid;
	gid_t gid, egid, sgid;
	uint8_t priority;
	char *name;
	uint32_t usertime, systime;
	int state;
	uint64_t sleepExpiry;
	int status;
	uintptr_t esp, ebp, eip;
	Task *next, *tnext, *parent;
	pid_t ppid;
	page_dir_t pageDir;
	Spinlock lock;
	uint8_t inSyscall;
	File *executable;
	VMRegion *stack, *tls;
	TaskQueue waiting;
	sigset_t sigset;
	sigset_t blockedSignals;

	/* Messages */
	Message *msgQueue;

	/* Namespaces */
	FileSystem *fs;
	Files *files;
	VirtualMemory *vm;
	SigHandlers *signals;
//	Messages *ipc;
};

extern Task *currentTask[];
#define current currentTask[CPUID]

/* Check if a routine is running as a syscall */
static inline uint8_t
in_syscall(void)
{
	if (!current)
		return 0;
	return (current->inSyscall);
}

/* Check if super-user */
static inline int
super_user(void)
{
	return (current->euid == 0);
}

void init_tasking(void);
void syscall_handler(InterruptFrame *frame);
Task *find_task(pid_t tid);
void add_to_queue(TaskQueue *queue, Task *task);
void remove_from_queue(TaskQueue *queue, Task *task);
Task *pop_from_queue(TaskQueue *queue);
void timer_handler(InterruptFrame *frame);
void block_task(int reason);
void unblock_task(Task *task);
void schedule(void);
pid_t fork(void);
pid_t clone(int flags);
void terminate(void);
void exit(int status);
pid_t waitpid(pid_t pid, int *wstatus, int options);
pid_t getpid(void);
uid_t getuid(void);
int setuid(uid_t uid);
uid_t geteuid(void);
int seteuid(uid_t euid);
gid_t getgid(void);
int setgid(gid_t gid);
gid_t getegid(void);
int setegid(gid_t egid);
int isatty(int fd);
int execve(const char *file, char *argv[], char *envp[]);

void send_sig(Task *target, int sig);
int tgkill(pid_t tgid, pid_t tid, int sig);
int kill(pid_t pid, int sig);

#endif