#pragma once

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

__BEGIN_DECLS

#define F_DUPFD 0
#define F_GETFD 1
#define F_SETFD 2
#define F_GETFL 3
#define F_SETFL 4

#define FD_CLOEXEC 1

#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#define O_CREAT 0100
#define O_EXCL 0200
#define O_NOCTTY 0400
#define O_TRUNC 01000
#define O_APPEND 02000
#define O_NONBLOCK 04000
#define O_DIRECTORY 00200000
#define O_NOFOLLOW 00400000
#define O_CLOEXEC 02000000

#define S_IFMT 0170000
#define S_IFDIR 0040000
#define S_IFCHR 0020000
#define S_IFBLK 0060000
#define S_IFREG 0100000
#define S_IFIFO 0010000
#define S_IFLNK 0120000
#define S_IFSOCK 0140000

#define S_ISUID 04000
#define S_ISGID 02000
#define S_ISVTX 01000
#define S_IRUSR 0400
#define S_IWUSR 0200
#define S_IXUSR 0100
#define S_IRGRP 0040
#define S_IWGRP 0020
#define S_IXGRP 0010
#define S_IROTH 0004
#define S_IWOTH 0002
#define S_IXOTH 0001

#define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR)

#define S_IRWXG (S_IRWXU >> 3)
#define S_IRWXO (S_IRWXG >> 3)

int fcntl(int fd, int cmd, ...);

#define F_RDLCK 0
#define F_WRLCK 1
#define F_UNLCK 2

#define F_SETLKW 7

struct flock {
    short l_type;
    short l_whence;
    off_t l_start;
    off_t l_len;
    pid_t l_pid;
};

__END_DECLS