#ifndef _UNISTD_H
#define _UNISTD_H

#include <stdint.h>

#ifndef _SSIZE_T
#define _SSIZE_T
typedef int32_t ssize_t;
#endif

typedef int16_t pid_t;

#define __SYS_alarm     0
#define __SYS_ctty      1
#define __SYS_getpdir   2
#define __SYS_getpid    3
#define __SYS_kill      4
#define __SYS_panic     5
#define __SYS_pause     6
#define __SYS_read      7
#define __SYS_signal    8
#define __SYS_time      9
#define __SYS_write     10

#define _syscall0(type, name) \
  type name(void) { \
    type __res; \
    __asm__ volatile ( \
        "int $0x80" \
        : "=a" (__res) \
        : "a" (__SYS_##name) \
        ); \
    return __res; \
  }

#define _syscall1(type, name, atype, a) \
  type name(atype a) { \
    type __res; \
    __asm__ volatile ( \
        "int $0x80" \
        : "=a" (__res) \
        : "a" (__SYS_##name), "b" (a) \
        ); \
    return __res; \
  }

#define _syscall2(type, name, atype, a, btype, b) \
  type name(atype a, btype b) { \
    type __res; \
    __asm__ volatile ( \
        "int $0x80" \
        : "=a" (__res) \
        : "a" (__SYS_##name), "b" (a), "c" (b) \
        ); \
    return __res; \
  }

pid_t getpid(void);
void *getpdir(void);

int pause(void);

void panic(void);

#endif