#ifndef _SIGNAL_H
#define _SIGNAL_H

#include <stdint.h>
#include <stddef.h>

typedef struct {
	void *base;
	int flags;
	size_t size;
} stack_t;

typedef struct {
	uint64_t sig[1024 / 64];
} sigset_t;

#define SIGNAL_GET(sigset, signal) ((sigset)->sig[((signal) - 1) / 64] & (1lu << (((signal) - 1) % 64)))
#define SIGNAL_SETON(sigset, signal) (sigset)->sig[((signal) - 1) / 64] |= (1lu << (((signal) - 1) % 64))
#define SIGNAL_SETOFF(sigset, signal) (sigset)->sig[((signal) - 1) / 64] &= ~(1lu << (((signal) - 1) % 64))

#define SIG_DFL ((void *)(0))
#define SIG_IGN ((void *)(1))

#define SA_NOCLDSTOP 1
#define SA_NOCLDWAIT 2
#define SA_SIGINFO 4
#define SA_ONSTACK 0x08000000
#define SA_RESTART 0x10000000
#define SA_NODEFER 0x40000000
#define SA_RESETHAND 0x80000000
#define SA_RESTORER 0x04000000

#define NSIG 65

typedef struct {
	void *address;
	unsigned long flags;
	void (*restorer)(void);
	sigset_t mask;
} sigaction_t;

#define POLL_IN 1
#define POLL_OUT 2
#define POLL_MSG 3
#define POLL_ERR 4
#define POLL_PRI 5
#define POLL_HUP 6

union sigval {
	int sival_int;
	void *sival_ptr;
};

typedef long clock_t;

// struct taken from musl.

typedef struct {
	int si_signo, si_errno, si_code;
	union {
		char __pad[128 - 2*sizeof(int) - sizeof(long)];
		struct {
			union {
				struct {
					pid_t si_pid;
					uid_t si_uid;
				} __piduid;
				struct {
					int si_timerid;
					int si_overrun;
				} __timer;
			} __first;
			union {
				union sigval si_value;
				struct {
					int si_status;
					clock_t si_utime, si_stime;
				} __sigchld;
			} __second;
		} __si_common;
		struct {
			void *si_addr;
			short si_addr_lsb;
			union {
				struct {
					void *si_lower;
					void *si_upper;
				} __addr_bnd;
				unsigned si_pkey;
			} __first;
		} __sigfault;
		struct {
			long si_band;
			int si_fd;
		} __sigpoll;
		struct {
			void *si_call_addr;
			int si_syscall;
			unsigned si_arch;
		} __sigsys;
	} __si_fields;
} siginfo_t;

#define SIGHUP    1
#define SIGQUIT   3
#define SIGTRAP   5
#define SIGABRT 6
#define SIGIOT    SIGABRT
#define SIGBUS    7
#define SIGKILL   9
#define SIGUSR1   10
#define SIGUSR2   12
#define SIGPIPE   13
#define SIGALRM   14
#define SIGSTKFLT 16
#define SIGCHLD   17
#define SIGCONT   18
#define SIGSTOP   19
#define SIGTSTP   20
#define SIGTTIN   21
#define SIGTTOU   22
#define SIGURG    23
#define SIGXCPU   24
#define SIGXFSZ   25
#define SIGVTALRM 26
#define SIGWINCH  28
#define SIGPOLL   29
#define SIGSYS    31
#define SIGUNUSED SIGSYS
#define SIGCANCEL 32
#define SIGABRT 6
#define SIGFPE 8
#define SIGILL 4
#define SIGINT 2
#define SIGSEGV 11
#define SIGTERM 15
#define SIGPROF 27
#define SIGIO 29
#define SIGPWR 30
#define SIGRTMIN 35
#define SIGRTMAX 64

#define SIG_BLOCK 0
#define SIG_UNBLOCK 1
#define SIG_SETMASK 2

#define SIG_ACTION_TERM 0
#define SIG_ACTION_IGN 1
#define SIG_ACTION_CORE 2
#define SIG_ACTION_STOP 3
#define SIG_ACTION_CONT 4

struct proc_t;
struct thread_t;
void signal_action(struct proc_t *proc, int signal, sigaction_t *new, sigaction_t *old);
void signal_altstack(struct thread_t *thread, stack_t *new, stack_t *old);
void signal_changemask(struct thread_t *thread, int how, sigset_t *new, sigset_t *old);
void signal_returnmask(struct thread_t *thread, sigset_t *sigset);
void signal_signalproc(struct proc_t *proc, int signal);
void signal_signalthread(struct thread_t *thread, int signal, bool urgent);
void signal_pending(struct thread_t *, sigset_t *sigset);
void signal_suspend(sigset_t *sigset);
int signal_wait(sigset_t *sigset, timespec_t *timeout, siginfo_t *siginfo, int *signum);
bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uint64_t syscallret, uint64_t syscallerrno);
extern int signal_defaultactions[NSIG];

#endif