#ifndef _UNISTD_H
#define _UNISTD_H

/* 
 * Generic Posix prototypes used by the rest of the libc. Plats don't have to
 * implement these if they don't care about the functionality, but if they do,
 * they must conform to these prototypes.
 */

#include <ack/config.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>

#if ACKCONF_WANT_STANDARD_O
/* A standard set of flags for read/write/creat and friends for platforms
 * where these aren't determined by the operating system. */

enum
{
	O_ACCMODE = 0x3,
	
	O_RDONLY = 0,
	O_WRONLY = 1,
	O_RDWR = 2,
	
	O_CREAT = 0100,
	O_TRUNC = 01000,
	O_APPEND = 02000,
	O_NONBLOCK = 04000
};
#endif

#if ACKCONF_WANT_STANDARD_SIGNALS
/* A standard set of definitions for signal handling for platforms where these
 * aren't determined by the operating system. */

typedef int sig_atomic_t;

#define SIG_ERR ((sighandler_t) -1)           /* Error return.  */
#define SIG_DFL ((sighandler_t) 0)            /* Default action.  */
#define SIG_IGN ((sighandler_t) 1)            /* Ignore signal.  */

#define SIGABRT         6       /* Abort (ANSI) */
#define SIGILL          11      /* Illegal instruction */

#define _NSIG           16      /* Biggest signal number + 1
                                   (not including real-time signals).  */
typedef void (*sighandler_t)(int);
typedef uint16_t sigset_t;

#endif

/* Special variables */

extern char** environ;

/* Implemented system calls */

extern int brk(void* ptr);
extern int close(int d);
extern int creat(const char* path, mode_t mode);
extern int execve(const char *path, char *const argv[], char *const envp[]);
extern int isatty(int d);
extern int isatty(int d);
extern int kill(pid_t old, int sig);
extern int open(const char* path, int access, ...);
extern int raise(int signum);
extern int sigprocmask(int, const sigset_t *, sigset_t *);
extern int unlink(const char* path);
extern off_t lseek(int fildes, off_t offset, int whence);
extern pid_t getpid(void);
extern sighandler_t signal(int signum, sighandler_t handler);
extern ssize_t read(int fd, void* buffer, size_t count);
extern ssize_t write(int fd, void* buffer, size_t count);
extern void _exit(int);
extern void* sbrk(int increment);
extern int fcntl(int fd, int op, ...);

#endif