// Minimal signal.h stub for freestanding
#ifndef _SIGNAL_H
#define _SIGNAL_H
#include <stdint.h>

typedef int sig_atomic_t;
typedef void (*sighandler_t)(int);
typedef sighandler_t sig_t;
typedef uint32_t sigset_t;

struct sigaction {
    sighandler_t sa_handler;
    sigset_t sa_mask;
    int sa_flags;
    void (*sa_sigaction)(int, void *, void *);
};

#define SA_RESTART 0x10000000
#define SA_SIGINFO 4
#define SA_NOCLDSTOP 1

#define SIG_DFL ((sighandler_t)0)
#define SIG_IGN ((sighandler_t)1)
#define SIG_ERR ((sighandler_t)-1)

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

#define SIGHUP  1
#define SIGINT  2
#define SIGQUIT 3
#define SIGILL  4
#define SIGTRAP 5
#define SIGABRT 6
#define SIGIOT  6
#define SIGBUS  7
#define SIGFPE  8
#define SIGKILL 9
#define SIGUSR1 10
#define SIGSEGV 11
#define SIGUSR2 12
#define SIGPIPE 13
#define SIGALRM 14
#define SIGTERM 15
#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 SIGPROF 27
#define SIGWINCH 28
#define SIGIO   29
#define SIGPWR  30
#define SIGSYS  31

#define NSIG 32

sighandler_t signal(int signum, sighandler_t handler);
int raise(int sig);
int kill(int pid, int sig);
int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
int sigemptyset(sigset_t *set);
int sigaddset(sigset_t *set, int signum);
int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
int sigsuspend(const sigset_t *mask);

#endif /* _SIGNAL_H */