(c-system-include "sys/types.h")
(c-system-include "unistd.h")
(c-system-include "dirent.h")
(c-system-include "fcntl.h")

(define-c-type DIR
  finalizer: closedir)

(define-c-struct dirent
  (string d_name dirent-name))

(define-c-struct stat
  predicate: stat?
  (dev_t      st_dev      stat-dev)
  (ino_t      st_ino      stat-ino)
  (mode_t     st_mode     stat-mode)
  (nlink_t    st_nlink    stat-nlinks)
  (uid_t      st_uid      stat-uid)
  (gid_t      st_gid      stat-gid)
  (dev_t      st_rdev     stat-rdev)
  (off_t      st_size     stat-size)
  (blksize_t  st_blksize  stat-blksize)
  (blkcnt_t   st_blocks   stat-blocks)
  (time_t     st_atime    stat-atime)
  (time_t     st_mtime    stat-mtime)
  (time_t     st_ctime    stat-ctime))

(define-c boolean S_ISREG (mode_t))
(define-c boolean S_ISDIR (mode_t))
(define-c boolean S_ISCHR (mode_t))
(define-c boolean S_ISBLK (mode_t))
(define-c boolean S_ISFIFO (mode_t))
(define-c boolean S_ISLNK (mode_t))
(define-c boolean S_ISSOCK (mode_t))

;;(define-c-const int ("S_IFMT"))
(define-c-const int (file/socket "S_IFSOCK"))
(define-c-const int (file/link "S_IFLNK"))
(define-c-const int (file/regular "S_IFREG"))
(define-c-const int (file/block "S_IFBLK"))
(define-c-const int (file/directory "S_IFDIR"))
(define-c-const int (file/character "S_IFCHR"))
(define-c-const int (file/fifo "S_IFIFO"))
(define-c-const int (file/suid "S_ISUID"))
(define-c-const int (file/sgid "S_ISGID"))
(define-c-const int (file/sticky "S_ISVTX"))
;;(define-c-const int ("S_IRWXU"))
(define-c-const int (perm/user-read "S_IRUSR"))
(define-c-const int (perm/user-write "S_IWUSR"))
(define-c-const int (perm/user-execute "S_IXUSR"))
;;(define-c-const int ("S_IRWXG"))
(define-c-const int (perm/group-read "S_IRGRP"))
(define-c-const int (perm/group-write "S_IWGRP"))
(define-c-const int (perm/group-execute "S_IXGRP"))
;;(define-c-const int ("S_IRWXO"))
(define-c-const int (perm/others-read "S_IROTH"))
(define-c-const int (perm/others-write "S_IWOTH"))
(define-c-const int (perm/others-execute "S_IXOTH"))

(define-c errno stat (string (result stat)))
(define-c errno fstat (int (result stat)))
(define-c errno (file-link-status "lstat") (string (result stat)))

(define-c input-port (open-input-file-descriptor "fdopen")
  (int (value "r" string)))
(define-c output-port (open-output-file-descriptor "fdopen")
  (int (value "w" string)))

(define-c errno (delete-file "unlink") (string))
(define-c errno (link-file "link") (string string))
(define-c errno (symbolic-link-file "symlink") (string string))
(define-c errno (rename-file "rename") (string string))

(define-c non-null-string (current-directory "getcwd")
  ((result (array char (auto-expand arg1))) (value 256 int)))

(define-c errno (create-directory "mkdir") (string int))
(define-c errno (delete-directory "rmdir") (string))

(define-c (free DIR) opendir (string))
(define-c dirent readdir ((link DIR)))

(define-c int (duplicate-file-descriptor "dup") (int))
(define-c errno (duplicate-file-descriptor-to "dup2") (int int))
(define-c errno (close-file-descriptor "close") (int))

(define-c errno (open-pipe "pipe") ((result (array int 2))))
(define-c errno (make-fifo "mkfifo") (string (default #o644 int)))

(define-c int (get-file-descriptor-flags "fcntl")
  (int (value F_GETFD int)))
(define-c errno (set-file-descriptor-flags! "fcntl")
  (int (value F_SETFD int) long))

(define-c int (get-file-descriptor-status "fcntl")
  (int (value F_GETFL int)))
(define-c errno (set-file-descriptor-status! "fcntl")
  (int (value F_SETFL int) long))

;; (define-c int (get-file-descriptor-lock "fcntl")
;;   (int (value F_GETLK int) flock))
;; (define-c errno (set-file-descriptor-lock! "fcntl")
;;   (int (value F_SETLK int) flock))
;; (define-c errno (try-set-file-descriptor-lock! "fcntl")
;;   (int (value F_SETLKW int) flock))

(define-c-const int (open/read "O_RDONLY"))
(define-c-const int (open/write "O_WRONLY"))
(define-c-const int (open/read-write "O_RDWR"))
(define-c-const int (open/create "O_CREAT"))
(define-c-const int (open/exclusive "O_EXCL"))
(define-c-const int (open/truncate "O_TRUNC"))
(define-c-const int (open/append "O_APPEND"))
(define-c-const int (open/non-block "O_NONBLOCK"))