The standard library Posix_File api is a sub-API of the Posixlib api.
The above information is manually maintained and may contain errors.
api { eqtype User_Id; eqtype Group_Id; eqtype File_Descriptor; fd_to_int : File_Descriptor -> Int; int_to_fd : Int -> File_Descriptor; fd_to_iod : File_Descriptor -> Int; iod_to_fd : Int -> File_Descriptor; Directory_Stream; open_directory_stream : String -> Directory_Stream; read_directory_entry : Directory_Stream -> Null_Or(String ); rewind_directory_stream : Directory_Stream -> Void; close_directory_stream : Directory_Stream -> Void; change_directory : String -> Void; current_directory : Void -> String; stdin : File_Descriptor; stdout : File_Descriptor; stderr : File_Descriptor; package s : api { Mode; Flags = Mode; to_unt : Flags -> one_word_unt::Unt; from_unt : one_word_unt::Unt -> Flags; all : Flags; flags : List(Flags ) -> Flags; intersect : List(Flags ) -> Flags; clear : (Flags , Flags) -> Flags; all_set : (Flags , Flags) -> Bool; any_set : (Flags , Flags) -> Bool; irwxu : Mode; irusr : Mode; iwusr : Mode; ixusr : Mode; irwxg : Mode; irgrp : Mode; iwgrp : Mode; ixgrp : Mode; irwxo : Mode; iroth : Mode; iwoth : Mode; ixoth : Mode; isuid : Mode; isgid : Mode;};; mode_0755 : s::Mode; mode_0700 : s::Mode; mode_0666 : s::Mode; mode_0644 : s::Mode; mode_0600 : s::Mode; package o : api { eqtype Flags; to_unt : Flags -> one_word_unt::Unt; from_unt : one_word_unt::Unt -> Flags; all : Flags; flags : List(Flags ) -> Flags; intersect : List(Flags ) -> Flags; clear : (Flags , Flags) -> Flags; all_set : (Flags , Flags) -> Bool; any_set : (Flags , Flags) -> Bool; append : Flags; dsync : Flags; excl : Flags; noctty : Flags; nonblock : Flags; rsync : Flags; sync : Flags; trunc : Flags;};; Open_Mode = O_RDONLY | O_RDWR | O_WRONLY; openf : (String , Open_Mode , o::Flags) -> File_Descriptor; createf : (String , Open_Mode , o::Flags , s::Mode) -> File_Descriptor; creat : (String , s::Mode) -> File_Descriptor; umask : s::Mode -> s::Mode; link : {new:String, old:String} -> Void; mkstemp : Void -> File_Descriptor; mkdir : (String , s::Mode) -> Void; make_named_pipe : (String , s::Mode) -> Void; unlink : String -> Void; rmdir : String -> Void; rename : {from:String, to:String} -> Void; symlink : {new:String, old:String} -> Void; readlink : String -> String; ftruncate : (File_Descriptor , Int) -> Void; eqtype Device; unt_to_dev : one_word_unt::Unt -> Device; dev_to_unt : Device -> one_word_unt::Unt; eqtype Inode; unt_to_ino : one_word_unt::Unt -> Inode; ino_to_unt : Inode -> one_word_unt::Unt; package stat : api { Stat = {atime:time::Time, ctime:time::Time, dev:Int, ftype:Int, gid:one_word_unt::Unt, inode:Int, mode:s::Flags, mtime:time::Time, nlink:Int, size:Int, uid:one_word_unt::Unt}; is_directory : Stat -> Bool; is_char_dev : Stat -> Bool; is_block_dev : Stat -> Bool; is_file : Stat -> Bool; is_pipe : Stat -> Bool; is_symlink : Stat -> Bool; is_socket : Stat -> Bool; mode : Stat -> s::Mode; inode : Stat -> Int; dev : Stat -> Int; nlink : Stat -> Int; uid : Stat -> User_Id; gid : Stat -> Group_Id; size : Stat -> Int; atime : Stat -> time::Time; mtime : Stat -> time::Time; ctime : Stat -> time::Time;};; stat : String -> stat::Stat; lstat : String -> stat::Stat; fstat : File_Descriptor -> stat::Stat; Access_Mode = MAY_EXECUTE | MAY_READ | MAY_WRITE; access : (String , List(Access_Mode )) -> Bool; chmod : (String , s::Mode) -> Void; fchmod : (File_Descriptor , s::Mode) -> Void; chown : (String , User_Id , Group_Id) -> Void; fchown : (File_Descriptor , User_Id , Group_Id) -> Void; utime : (String , Null_Or({actime:time::Time, modtime:time::Time} )) -> Void; pathconf : (String , String) -> Null_Or(one_word_unt::Unt ); fpathconf : (File_Descriptor , String) -> Null_Or(one_word_unt::Unt ); osval3__syscall : String -> Int; set__osval3__ref : ({fun_name:String, io_call:String -> Int, lib_name:String} -> String -> Int) -> Void; Ckit_Dirstream = runtime::Chunk; opendir__syscall : String -> Ckit_Dirstream; set__opendir__ref : ({fun_name:String, io_call:String -> Ckit_Dirstream, lib_name:String} -> String -> Ckit_Dirstream) -> Void; readdir__syscall : Ckit_Dirstream -> String; set__readdir__ref : ({fun_name:String, io_call:Ckit_Dirstream -> String, lib_name:String} -> Ckit_Dirstream -> String) -> Void; rewinddir__syscall : Ckit_Dirstream -> Void; set__rewinddir__ref : ({fun_name:String, io_call:Ckit_Dirstream -> Void, lib_name:String} -> Ckit_Dirstream -> Void) -> Void; closedir__syscall : Ckit_Dirstream -> Void; set__closedir__ref : ({fun_name:String, io_call:Ckit_Dirstream -> Void, lib_name:String} -> Ckit_Dirstream -> Void) -> Void; change_directory__syscall : String -> Void; set__change_directory__ref : ({fun_name:String, io_call:String -> Void, lib_name:String} -> String -> Void) -> Void; current_directory__syscall : Void -> String; set__current_directory__ref : ({fun_name:String, io_call:Void -> String, lib_name:String} -> Void -> String) -> Void; openf__syscall : (String , one_word_unt::Unt , one_word_unt::Unt) -> Int; set__openf__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt , one_word_unt::Unt) -> Int, lib_name:String} -> (String , one_word_unt::Unt , one_word_unt::Unt) -> Int ) -> Void; mkstemp__syscall : Void -> Int; set__mkstemp__ref : ({fun_name:String, io_call:Void -> Int, lib_name:String} -> Void -> Int) -> Void; umask__syscall : one_word_unt::Unt -> one_word_unt::Unt; set__umask__ref : ( {fun_name:String, io_call:one_word_unt::Unt -> one_word_unt::Unt, lib_name:String} -> one_word_unt::Unt -> one_word_unt::Unt ) -> Void; link__syscall : (String , String) -> Void; set__link__ref : ({fun_name:String, io_call:(String , String) -> Void, lib_name:String} -> (String , String) -> Void) -> Void; rename__syscall : (String , String) -> Void; set__rename__ref : ({fun_name:String, io_call:(String , String) -> Void, lib_name:String} -> (String , String) -> Void) -> Void; symlink__syscall : (String , String) -> Void; set__symlink__ref : ({fun_name:String, io_call:(String , String) -> Void, lib_name:String} -> (String , String) -> Void) -> Void; mkdir__syscall : (String , one_word_unt::Unt) -> Void; set__mkdir__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt) -> Void, lib_name:String} -> (String , one_word_unt::Unt) -> Void ) -> Void; make_named_pipe__syscall : (String , one_word_unt::Unt) -> Void; set__make_named_pipe__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt) -> Void, lib_name:String} -> (String , one_word_unt::Unt) -> Void ) -> Void; unlink__syscall : String -> Void; set__unlink__ref : ({fun_name:String, io_call:String -> Void, lib_name:String} -> String -> Void) -> Void; rmdir__syscall : String -> Void; set__rmdir__ref : ({fun_name:String, io_call:String -> Void, lib_name:String} -> String -> Void) -> Void; readlink__syscall : String -> String; set__readlink__ref : ({fun_name:String, io_call:String -> String, lib_name:String} -> String -> String) -> Void; ftruncate__syscall : (Int , Int) -> Void; set__ftruncate__ref : ({fun_name:String, io_call:(Int , Int) -> Void, lib_name:String} -> (Int , Int) -> Void) -> Void; Statrep = ( Int , one_word_unt::Unt , one_word_unt::Unt , one_word_unt::Unt , one_word_unt::Unt , one_word_unt::Unt , one_word_unt::Unt , Int , one_word_int::Int , one_word_int::Int , one_word_int::Int ); stat__syscall : String -> Statrep; set__stat__ref : ({fun_name:String, io_call:String -> Statrep, lib_name:String} -> String -> Statrep) -> Void; lstat__syscall : String -> Statrep; set__lstat__ref : ({fun_name:String, io_call:String -> Statrep, lib_name:String} -> String -> Statrep) -> Void; fstat__syscall : Int -> Statrep; set__fstat__ref : ({fun_name:String, io_call:Int -> Statrep, lib_name:String} -> Int -> Statrep) -> Void; access__syscall : (String , one_word_unt::Unt) -> Bool; set__access__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt) -> Bool, lib_name:String} -> (String , one_word_unt::Unt) -> Bool ) -> Void; chmod__syscall : (String , one_word_unt::Unt) -> Void; set__chmod__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt) -> Void, lib_name:String} -> (String , one_word_unt::Unt) -> Void ) -> Void; fchmod__syscall : (Int , one_word_unt::Unt) -> Void; set__fchmod__ref : ( {fun_name:String, io_call:(Int , one_word_unt::Unt) -> Void, lib_name:String} -> (Int , one_word_unt::Unt) -> Void ) -> Void; chown__syscall : (String , one_word_unt::Unt , one_word_unt::Unt) -> Void; set__chown__ref : ( {fun_name:String, io_call:(String , one_word_unt::Unt , one_word_unt::Unt) -> Void, lib_name:String} -> (String , one_word_unt::Unt , one_word_unt::Unt) -> Void ) -> Void; fchown__syscall : (Int , one_word_unt::Unt , one_word_unt::Unt) -> Void; set__fchown__ref : ( {fun_name:String, io_call:(Int , one_word_unt::Unt , one_word_unt::Unt) -> Void, lib_name:String} -> (Int , one_word_unt::Unt , one_word_unt::Unt) -> Void ) -> Void; utime__syscall : (String , one_word_int::Int , one_word_int::Int) -> Void; set__utime__ref : ( {fun_name:String, io_call:(String , one_word_int::Int , one_word_int::Int) -> Void, lib_name:String} -> (String , one_word_int::Int , one_word_int::Int) -> Void ) -> Void; pathconf__syscall : (String , String) -> Null_Or(one_word_unt::Unt ); set__pathconf__ref : ( {fun_name:String, io_call:(String , String) -> Null_Or(one_word_unt::Unt ), lib_name:String} -> (String , String) -> Null_Or(one_word_unt::Unt ) ) -> Void; fpathconf__syscall : (Int , String) -> Null_Or(one_word_unt::Unt ); set__fpathconf__ref : ( {fun_name:String, io_call:(Int , String) -> Null_Or(one_word_unt::Unt ), lib_name:String} -> (Int , String) -> Null_Or(one_word_unt::Unt ) ) -> Void;};