#ifndef _LIBC_UNISTD_H
#define _LIBC_UNISTD_H

#pragma once

#include <stddef.h>
#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif

#define STDIN_FILENO  0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2

#define F_OK 0
#define X_OK 1
#define W_OK 2
#define R_OK 4

int    read(int fd, void *buf, size_t count);
int    write(int fd, const void *buf, size_t count);
int    close(int fd);
long   lseek(int fd, long offset, int whence);
int    chdir(const char *path);
char  *getcwd(char *buf, size_t size);
int    access(const char *path, int mode);
int    isatty(int fd);
int    unlink(const char *path);
int    rmdir(const char *path);
int    dup(int fd);
int    dup2(int oldfd, int newfd);
pid_t  getpid(void);
void   _exit(int status) __attribute__((noreturn));
pid_t  fork(void);
int    execv(const char *path, char *const argv[]);
int    execve(const char *path, char *const argv[], char *const envp[]);
int    execvp(const char *file, char *const argv[]);
int    pipe(int fds[2]);
long   pathconf(const char *path, int name);

/* pathconf() names (Linux numbering). */
#define _PC_LINK_MAX  0
#define _PC_MAX_CANON 1
#define _PC_MAX_INPUT 2
#define _PC_NAME_MAX  3
#define _PC_PATH_MAX  4
#define _PC_PIPE_BUF  5

extern char **environ;

unsigned int sleep(unsigned int seconds);

#ifdef __cplusplus
}
#endif

#endif /* _LIBC_UNISTD_H */