1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
4 # Copyright 2008 Floréal Morandat <morandat@lirmm.fr>
5 # Copyright 2008 Jean-Sébastien Gélinas <calestar@gmail.com>
7 # This file is free software, which comes along with NIT. This software is
8 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
10 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
11 # is kept unaltered, and a notification of the changes is added.
12 # You are allowed to redistribute it and sell it, alone or is a part of
15 # File manipulations (create, read, write, etc.)
27 #include <sys/types.h>
35 # File Abstract Stream
36 abstract class FStream
38 # The path of the file.
39 var path
: nullable String = null
42 private var file
: nullable NativeFile = null
44 # The status of a file. see POSIX stat(2).
45 fun file_stat
: NativeFileStat do return _file
.file_stat
47 # File descriptor of this file
48 fun fd
: Int do return _file
.fileno
50 # Sets the buffering mode for the current FStream
52 # If the buf_size is <= 0, its value will be 512 by default
54 # The mode is any of the buffer_mode enumeration in `Sys`:
58 fun set_buffering_mode
(buf_size
, mode
: Int) do
59 if buf_size
<= 0 then buf_size
= 512
60 if _file
.set_buffering_type
(buf_size
, mode
) != 0 then
61 last_error
= new IOError("Error while changing buffering type for FStream, returned error {sys.errno.strerror}")
73 # Open the same file again.
74 # The original path is reused, therefore the reopened file can be a different file.
77 if not eof
and not _file
.address_is_null
then close
79 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
80 if _file
.address_is_null
then
81 last_error
= new IOError("Error: Opening file at '{path.as(not null)}' failed with '{sys.errno.strerror}'")
92 if _file
== null or _file
.address_is_null
then return
93 var i
= _file
.io_close
101 var nb
= _file
.io_read
(_buffer
.items
, _buffer
.capacity
)
111 redef var end_reached
: Bool = false
113 # Open the file at `path` for reading.
114 init open
(path
: String)
118 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
119 if _file
.address_is_null
then
120 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
125 init from_fd
(fd
: Int) do
128 _file
= fd
.fd_to_stream
(read_only
)
129 if _file
.address_is_null
then
130 last_error
= new IOError("Error: Converting fd {fd} to stream failed with '{sys.errno.strerror}'")
143 if last_error
!= null then return
144 if not _is_writable
then
145 last_error
= new IOError("Cannot write to non-writable stream")
148 if s
isa FlatText then
149 write_native
(s
.to_cstring
, s
.length
)
151 for i
in s
.substrings
do write_native
(i
.to_cstring
, i
.length
)
158 if _file
== null then return
159 if _file
.address_is_null
then
160 if last_error
!= null then return
161 last_error
= new IOError("Cannot close unopened write stream")
165 var i
= _file
.io_close
167 last_error
= new IOError("Close failed due to error {sys.errno.strerror}")
172 redef var is_writable
= false
174 # Write `len` bytes from `native`.
175 private fun write_native
(native
: NativeString, len
: Int)
177 if last_error
!= null then return
178 if not _is_writable
then
179 last_error
= new IOError("Cannot write to non-writable stream")
182 if _file
.address_is_null
then
183 last_error
= new IOError("Writing on a null stream")
187 var err
= _file
.io_write
(native
, len
)
190 last_error
= new IOError("Problem in writing : {err} {len} \n")
194 # Open the file at `path` for writing.
195 init open
(path
: String)
197 _file
= new NativeFile.io_open_write
(path
.to_cstring
)
200 if _file
.address_is_null
then
201 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
206 # Creates a new File stream from a file descriptor
207 init from_fd
(fd
: Int) do
209 _file
= fd
.fd_to_stream
(wipe_write
)
211 if _file
.address_is_null
then
212 last_error
= new IOError("Error: Opening stream from file descriptor {fd} failed with '{sys.errno.strerror}'")
219 # Creates a file stream from a file descriptor `fd` using the file access `mode`.
221 # NOTE: The `mode` specified must be compatible with the one used in the file descriptor.
222 private fun fd_to_stream
(mode
: NativeString): NativeFile is extern "file_int_fdtostream"
225 # Constant for read-only file streams
226 private fun read_only
: NativeString do return "r".to_cstring
228 # Constant for write-only file streams
230 # If a stream is opened on a file with this method,
231 # it will wipe the previous file if any.
232 # Else, it will create the file.
233 private fun wipe_write
: NativeString do return "w".to_cstring
235 ###############################################################################
237 # Standard input stream.
242 _file
= new NativeFile.native_stdin
247 redef fun poll_in
: Bool is extern "file_stdin_poll_in"
250 # Standard output stream.
254 _file
= new NativeFile.native_stdout
260 # Standard error stream.
264 _file
= new NativeFile.native_stderr
270 ###############################################################################
272 redef class Streamable
273 # Like `write_to` but take care of creating the file
274 fun write_to_file
(filepath
: String)
276 var stream
= new OFStream.open
(filepath
)
282 # Utility class to access file system services
284 # Usually created with `Text::to_path`.
287 private var path
: String
290 redef fun to_s
do return path
292 # Name of the file name at `to_s`
295 # var path = "/tmp/somefile".to_path
296 # assert path.filename == "somefile"
298 var filename
: String = path
.basename
("") is lazy
300 # Does the file at `path` exists?
301 fun exists
: Bool do return stat
!= null
303 # Information on the file at `self` following symbolic links
305 # Returns `null` if there is no file at `self`.
308 # var p = "/tmp/".to_path
310 # if stat != null then # Does `p` exist?
311 # print "It's size is {stat.size}"
312 # if stat.is_dir then print "It's a directory"
315 fun stat
: nullable FileStat
317 var stat
= path
.to_cstring
.file_stat
318 if stat
.address_is_null
then return null
319 return new FileStat(stat
)
322 # Information on the file or link at `self`
324 # Do not follow symbolic links.
325 fun link_stat
: nullable FileStat
327 var stat
= path
.to_cstring
.file_lstat
328 if stat
.address_is_null
then return null
329 return new FileStat(stat
)
332 # Delete a file from the file system, return `true` on success
335 fun delete
: Bool do return path
.to_cstring
.file_delete
337 # Copy content of file at `path` to `dest`
343 var output
= dest
.open_wo
345 while not input
.eof
do
346 var buffer
= input
.read
(1024)
354 # Open this file for reading
356 # Require: `exists and not link_stat.is_dir`
357 fun open_ro
: IFStream
359 # TODO manage streams error when they are merged
360 return new IFStream.open
(path
)
363 # Open this file for writing
365 # Require: `not exists or not stat.is_dir`
366 fun open_wo
: OFStream
368 # TODO manage streams error when they are merged
369 return new OFStream.open
(path
)
372 # Read all the content of the file
374 # See `IStream::read_all` for details.
383 # Read all the lines of the file
385 # See `IStream::read_lines` for details.
386 fun read_lines
: Array[String]
389 var res
= s
.read_lines
394 # Return an iterator on each line of the file
395 # Note: the stream is automatically closed at the end of the file (see `LineIterator::close_on_finish`)
397 # See `IStream::each_line` for details.
398 fun each_line
: LineIterator
401 var res
= s
.each_line
402 res
.close_on_finish
= true
407 # Lists the name of the files contained within the directory at `path`
409 # Require: `exists and is_dir`
410 fun files
: Array[Path]
412 var files
= new Array[Path]
413 for filename
in path
.files
do
414 files
.add
new Path(path
/ filename
)
419 # Delete a directory and all of its content, return `true` on success
421 # Does not go through symbolic links and may get stuck in a cycle if there
422 # is a cycle in the file system.
426 for file
in self.files
do
427 var stat
= file
.link_stat
429 ok
= file
.rmdir
and ok
431 ok
= file
.delete
and ok
435 # Delete the directory itself
436 if ok
then path
.to_cstring
.rmdir
441 redef fun ==(other
) do return other
isa Path and path
.simplify_path
== other
.path
.simplify_path
442 redef fun hash
do return path
.simplify_path
.hash
445 # Information on a file
447 # Created by `Path::stat` and `Path::link_stat`.
449 # The information within this class is gathered when the instance is initialized
450 # it will not be updated if the targeted file is modified.
456 # The low-level status of a file
459 private var stat
: NativeFileStat
461 private var finalized
= false
465 if not finalized
then
471 # Returns the last access time in seconds since Epoch
472 fun last_access_time
: Int
478 # Returns the last modification time in seconds since Epoch
479 fun last_modification_time
: Int
485 # Size of the file at `path`
492 # Is this a regular file and not a device file, pipe, socket, etc.?
499 # Is this a directory?
506 # Is this a symbolic link?
513 # FIXME Make the following POSIX only? or implement in some other way on Windows
515 # Returns the last status change time in seconds since Epoch
516 fun last_status_change_time
: Int
522 # Returns the permission bits of file
529 # Is this a character device?
536 # Is this a block device?
543 # Is this a FIFO pipe?
550 # Is this a UNIX socket
559 # Access file system related services on the path at `self`
560 fun to_path
: Path do return new Path(to_s
)
564 # return true if a file with this names exists
565 fun file_exists
: Bool do return to_cstring
.file_exists
567 # The status of a file. see POSIX stat(2).
568 fun file_stat
: NativeFileStat do return to_cstring
.file_stat
570 # The status of a file or of a symlink. see POSIX lstat(2).
571 fun file_lstat
: NativeFileStat do return to_cstring
.file_lstat
573 # Remove a file, return true if success
574 fun file_delete
: Bool do return to_cstring
.file_delete
576 # Copy content of file at `self` to `dest`
577 fun file_copy_to
(dest
: String) do to_path
.copy
(dest
.to_path
)
579 # Remove the trailing extension `ext`.
581 # `ext` usually starts with a dot but could be anything.
583 # assert "file.txt".strip_extension(".txt") == "file"
584 # assert "file.txt".strip_extension("le.txt") == "fi"
585 # assert "file.txt".strip_extension("xt") == "file.t"
587 # if `ext` is not present, `self` is returned unmodified.
589 # assert "file.txt".strip_extension(".tar.gz") == "file.txt"
590 fun strip_extension
(ext
: String): String
592 if has_suffix
(ext
) then
593 return substring
(0, length
- ext
.length
)
598 # Extract the basename of a path and remove the extension
600 # assert "/path/to/a_file.ext".basename(".ext") == "a_file"
601 # assert "path/to/a_file.ext".basename(".ext") == "a_file"
602 # assert "path/to".basename(".ext") == "to"
603 # assert "path/to/".basename(".ext") == "to"
604 # assert "path".basename("") == "path"
605 # assert "/path".basename("") == "path"
606 # assert "/".basename("") == "/"
607 # assert "".basename("") == ""
608 fun basename
(ext
: String): String
610 var l
= length
- 1 # Index of the last char
611 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
612 if l
== 0 then return "/"
613 var pos
= chars
.last_index_of_from
('/', l
)
616 n
= substring
(pos
+1, l-pos
)
618 return n
.strip_extension
(ext
)
621 # Extract the dirname of a path
623 # assert "/path/to/a_file.ext".dirname == "/path/to"
624 # assert "path/to/a_file.ext".dirname == "path/to"
625 # assert "path/to".dirname == "path"
626 # assert "path/to/".dirname == "path"
627 # assert "path".dirname == "."
628 # assert "/path".dirname == "/"
629 # assert "/".dirname == "/"
630 # assert "".dirname == "."
633 var l
= length
- 1 # Index of the last char
634 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
635 var pos
= chars
.last_index_of_from
('/', l
)
637 return substring
(0, pos
)
638 else if pos
== 0 then
645 # Return the canonicalized absolute pathname (see POSIX function `realpath`)
646 fun realpath
: String do
647 var cs
= to_cstring
.file_realpath
648 var res
= cs
.to_s_with_copy
649 # cs.free_malloc # FIXME memory leak
653 # Simplify a file path by remove useless ".", removing "//", and resolving ".."
654 # ".." are not resolved if they start the path
655 # starting "/" is not removed
656 # trainling "/" is removed
658 # Note that the method only wonrk on the string:
660 # * no I/O access is performed
661 # * the validity of the path is not checked
664 # assert "some/./complex/../../path/from/../to/a////file//".simplify_path == "path/to/a/file"
665 # assert "../dir/file".simplify_path == "../dir/file"
666 # assert "dir/../../".simplify_path == ".."
667 # assert "dir/..".simplify_path == "."
668 # assert "//absolute//path/".simplify_path == "/absolute/path"
669 # assert "//absolute//../".simplify_path == "/"
671 fun simplify_path
: String
673 var a
= self.split_with
("/")
674 var a2
= new Array[String]
676 if x
== "." then continue
677 if x
== "" and not a2
.is_empty
then continue
678 if x
== ".." and not a2
.is_empty
and a2
.last
!= ".." then
684 if a2
.is_empty
then return "."
685 if a2
.length
== 1 and a2
.first
== "" then return "/"
689 # Correctly join two path using the directory separator.
691 # Using a standard "{self}/{path}" does not work in the following cases:
694 # * `path` ends with `'/'`.
695 # * `path` starts with `'/'`.
697 # This method ensures that the join is valid.
699 # assert "hello".join_path("world") == "hello/world"
700 # assert "hel/lo".join_path("wor/ld") == "hel/lo/wor/ld"
701 # assert "".join_path("world") == "world"
702 # assert "hello".join_path("/world") == "/world"
703 # assert "hello/".join_path("world") == "hello/world"
704 # assert "hello/".join_path("/world") == "/world"
706 # Note: You may want to use `simplify_path` on the result.
708 # Note: This method works only with POSIX paths.
709 fun join_path
(path
: String): String
711 if path
.is_empty
then return self
712 if self.is_empty
then return path
713 if path
.chars
[0] == '/' then return path
714 if self.last
== '/' then return "{self}{path}"
715 return "{self}/{path}"
718 # Convert the path (`self`) to a program name.
720 # Ensure the path (`self`) will be treated as-is by POSIX shells when it is
721 # used as a program name. In order to do that, prepend `./` if needed.
723 # assert "foo".to_program_name == "./foo"
724 # assert "/foo".to_program_name == "/foo"
725 # assert "".to_program_name == "./" # At least, your shell will detect the error.
726 fun to_program_name
: String do
727 if self.has_prefix
("/") then
734 # Alias for `join_path`
736 # assert "hello" / "world" == "hello/world"
737 # assert "hel/lo" / "wor/ld" == "hel/lo/wor/ld"
738 # assert "" / "world" == "world"
739 # assert "/hello" / "/world" == "/world"
741 # This operator is quite useful for chaining changes of path.
742 # The next one being relative to the previous one.
746 # var c = "baz/foobar"
747 # assert a/b/c == "/bar/baz/foobar"
748 fun /(path
: String): String do return join_path
(path
)
750 # Returns the relative path needed to go from `self` to `dest`.
752 # assert "/foo/bar".relpath("/foo/baz") == "../baz"
753 # assert "/foo/bar".relpath("/baz/bar") == "../../baz/bar"
755 # If `self` or `dest` is relative, they are considered relatively to `getcwd`.
757 # In some cases, the result is still independent of the current directory:
759 # assert "foo/bar".relpath("..") == "../../.."
761 # In other cases, parts of the current directory may be exhibited:
763 # var p = "../foo/bar".relpath("baz")
764 # var c = getcwd.basename("")
765 # assert p == "../../{c}/baz"
767 # For path resolution independent of the current directory (eg. for paths in URL),
768 # or to use an other starting directory than the current directory,
769 # just force absolute paths:
771 # var start = "/a/b/c/d"
772 # var p2 = (start/"../foo/bar").relpath(start/"baz")
773 # assert p2 == "../../d/baz"
776 # Neither `self` or `dest` has to be real paths or to exist in directories since
777 # the resolution is only done with string manipulations and without any access to
778 # the underlying file system.
780 # If `self` and `dest` are the same directory, the empty string is returned:
782 # assert "foo".relpath("foo") == ""
783 # assert "foo/../bar".relpath("bar") == ""
785 # The empty string and "." designate both the current directory:
787 # assert "".relpath("foo/bar") == "foo/bar"
788 # assert ".".relpath("foo/bar") == "foo/bar"
789 # assert "foo/bar".relpath("") == "../.."
790 # assert "/" + "/".relpath(".") == getcwd
791 fun relpath
(dest
: String): String
794 var from
= (cwd
/self).simplify_path
.split
("/")
795 if from
.last
.is_empty
then from
.pop
# case for the root directory
796 var to
= (cwd
/dest
).simplify_path
.split
("/")
797 if to
.last
.is_empty
then to
.pop
# case for the root directory
799 # Remove common prefixes
800 while not from
.is_empty
and not to
.is_empty
and from
.first
== to
.first
do
805 # Result is going up in `from` with ".." then going down following `to`
806 var from_len
= from
.length
807 if from_len
== 0 then return to
.join
("/")
808 var up
= "../"*(from_len-1
) + ".."
809 if to
.is_empty
then return up
810 var res
= up
+ "/" + to
.join
("/")
814 # Create a directory (and all intermediate directories if needed)
817 var dirs
= self.split_with
("/")
818 var path
= new FlatBuffer
819 if dirs
.is_empty
then return
820 if dirs
[0].is_empty
then
821 # it was a starting /
825 if d
.is_empty
then continue
828 path
.to_s
.to_cstring
.file_mkdir
832 # Delete a directory and all of its content, return `true` on success
834 # Does not go through symbolic links and may get stuck in a cycle if there
835 # is a cycle in the filesystem.
836 fun rmdir
: Bool do return to_path
.rmdir
838 # Change the current working directory
841 # assert getcwd == "/etc"
843 # assert getcwd == "/"
846 fun chdir
do to_cstring
.file_chdir
848 # Return right-most extension (without the dot)
850 # Only the last extension is returned.
851 # There is no special case for combined extensions.
853 # assert "file.txt".file_extension == "txt"
854 # assert "file.tar.gz".file_extension == "gz"
856 # For file without extension, `null` is returned.
857 # Hoever, for trailing dot, `""` is returned.
859 # assert "file".file_extension == null
860 # assert "file.".file_extension == ""
862 # The starting dot of hidden files is never considered.
864 # assert ".file.txt".file_extension == "txt"
865 # assert ".file".file_extension == null
866 fun file_extension
: nullable String
868 var last_slash
= chars
.last_index_of
('.')
869 if last_slash
> 0 then
870 return substring
( last_slash
+1, length
)
876 # returns files contained within the directory represented by self
877 fun files
: Array[String] is extern import Array[String], Array[String].add
, NativeString.to_s
, String.to_cstring
`{
881 dir_path = String_to_cstring( recv );
882 if ((dir = opendir(dir_path)) == NULL)
889 Array_of_String results;
893 results = new_Array_of_String();
895 while ( ( de = readdir( dir ) ) != NULL )
896 if ( strcmp( de->d_name, ".." ) != 0 &&
897 strcmp( de->d_name, "." ) != 0 )
899 file_name = NativeString_to_s( strdup( de->d_name ) );
900 Array_of_String_add( results, file_name );
909 redef class NativeString
910 private fun file_exists
: Bool is extern "string_NativeString_NativeString_file_exists_0"
911 private fun file_stat
: NativeFileStat is extern "string_NativeString_NativeString_file_stat_0"
912 private fun file_lstat
: NativeFileStat `{
913 struct stat* stat_element;
915 stat_element = malloc(sizeof(struct stat));
916 res = lstat(recv, stat_element);
917 if (res == -1) return NULL;
920 private fun file_mkdir
: Bool is extern "string_NativeString_NativeString_file_mkdir_0"
921 private fun rmdir
: Bool `{ return rmdir(recv); `}
922 private fun file_delete: Bool is extern "string_NativeString_NativeString_file_delete_0"
923 private fun file_chdir is extern "string_NativeString_NativeString_file_chdir_0"
924 private fun file_realpath: NativeString is extern "file_NativeString_realpath"
927 # This class is system dependent ... must reify the vfs
928 extern class NativeFileStat `{ struct stat * `}
929 # Returns the permission bits of file
930 fun mode
: Int is extern "file_FileStat_FileStat_mode_0"
931 # Returns the last access time
932 fun atime
: Int is extern "file_FileStat_FileStat_atime_0"
933 # Returns the last status change time
934 fun ctime
: Int is extern "file_FileStat_FileStat_ctime_0"
935 # Returns the last modification time
936 fun mtime
: Int is extern "file_FileStat_FileStat_mtime_0"
938 fun size
: Int is extern "file_FileStat_FileStat_size_0"
940 # Returns true if it is a regular file (not a device file, pipe, sockect, ...)
941 fun is_reg
: Bool `{ return S_ISREG(recv->st_mode); `}
942 # Returns true if it is a directory
943 fun is_dir: Bool `{ return S_ISDIR(recv->st_mode); `}
944 # Returns true if it is a character device
945 fun is_chr
: Bool `{ return S_ISCHR(recv->st_mode); `}
946 # Returns true if it is a block device
947 fun is_blk: Bool `{ return S_ISBLK(recv->st_mode); `}
948 # Returns true if the type is fifo
949 fun is_fifo
: Bool `{ return S_ISFIFO(recv->st_mode); `}
950 # Returns true if the type is a link
951 fun is_lnk: Bool `{ return S_ISLNK(recv->st_mode); `}
952 # Returns true if the type is a socket
953 fun is_sock
: Bool `{ return S_ISSOCK(recv->st_mode); `}
956 # Instance of this class are standard FILE * pointers
957 private extern class NativeFile `{ FILE* `}
958 fun io_read
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_read_2"
959 fun io_write
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_write_2"
960 fun io_close
: Int is extern "file_NativeFile_NativeFile_io_close_0"
961 fun file_stat
: NativeFileStat is extern "file_NativeFile_NativeFile_file_stat_0"
962 fun fileno
: Int `{ return fileno(recv); `}
963 # Flushes the buffer, forcing the write operation
964 fun flush: Int is extern "fflush"
965 # Used to specify how the buffering will be handled for the current stream.
966 fun set_buffering_type(buf_length: Int, mode: Int): Int is extern "file_NativeFile_NativeFile_set_buffering_type_0"
968 new io_open_read(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_read_1"
969 new io_open_write(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_write_1"
970 new native_stdin is extern "file_NativeFileCapable_NativeFileCapable_native_stdin_0"
971 new native_stdout is extern "file_NativeFileCapable_NativeFileCapable_native_stdout_0"
972 new native_stderr is extern "file_NativeFileCapable_NativeFileCapable_native_stderr_0"
978 if stdout isa FStream then stdout.as(FStream).set_buffering_mode(256, buffer_mode_line)
982 var stdin: PollableIStream = new Stdin is protected writable
985 var stdout: OStream = new Stdout is protected writable
987 # Standard output for errors
988 var stderr: OStream = new Stderr is protected writable
990 # Enumeration for buffer mode full (flushes when buffer is full)
991 fun buffer_mode_full: Int is extern "file_Sys_Sys_buffer_mode_full_0"
992 # Enumeration for buffer mode line (flushes when a `\n
` is encountered)
993 fun buffer_mode_line: Int is extern "file_Sys_Sys_buffer_mode_line_0"
994 # Enumeration for buffer mode none (flushes ASAP when something is written)
995 fun buffer_mode_none: Int is extern "file_Sys_Sys_buffer_mode_none_0"
997 # returns first available stream to read or write to
998 # return null on interruption (possibly a signal)
999 protected fun poll( streams : Sequence[FStream] ) : nullable FStream
1001 var in_fds = new Array[Int]
1002 var out_fds = new Array[Int]
1003 var fd_to_stream = new HashMap[Int,FStream]
1006 if s isa IFStream then in_fds.add( fd )
1007 if s isa OFStream then out_fds.add( fd )
1009 fd_to_stream[fd] = s
1012 var polled_fd = intern_poll( in_fds, out_fds )
1014 if polled_fd == null then
1017 return fd_to_stream[polled_fd]
1021 private fun intern_poll(in_fds: Array[Int], out_fds: Array[Int]) : nullable Int is extern import Array[Int].length, Array[Int].[], Int.as(nullable Int) `{
1022 int in_len
, out_len
, total_len
;
1023 struct pollfd
*c_fds
;
1026 int first_polled_fd
= -1;
1029 in_len
= Array_of_Int_length( in_fds
);
1030 out_len
= Array_of_Int_length( out_fds
);
1031 total_len
= in_len
+ out_len
;
1032 c_fds
= malloc
( sizeof
(struct pollfd
) * total_len
);
1035 for ( i
=0; i
<in_len
; i
++ ) {
1037 fd
= Array_of_Int__index( in_fds
, i
);
1040 c_fds
[i
].events
= POLLIN;
1043 /* output streams
*/
1044 for ( i
=0; i
<out_len
; i
++ ) {
1046 fd
= Array_of_Int__index( out_fds
, i
);
1049 c_fds
[i
].events
= POLLOUT;
1052 /* poll all fds
, unlimited timeout
*/
1053 result
= poll
( c_fds
, total_len
, -1 );
1056 /* analyse results
*/
1057 for ( i
=0; i
<total_len
; i
++ )
1058 if ( c_fds
[i
].revents
& c_fds
[i
].events
|| /* awaited event
*/
1059 c_fds
[i
].revents
& POLLHUP ) /* closed
*/
1061 first_polled_fd
= c_fds
[i
].fd
;
1065 return Int_as_nullable( first_polled_fd
);
1067 else if ( result
< 0 )
1068 fprintf
( stderr
, "Error in Stream:poll: %s\n", strerror
( errno
) );
1075 # Print `objects
` on the standard output (`stdout
`).
1076 protected fun printn(objects: Object...)
1078 sys.stdout.write(objects.to_s)
1081 # Print an `object
` on the standard output (`stdout
`) and add a newline.
1082 protected fun print(object: Object)
1084 sys.stdout.write(object.to_s)
1085 sys.stdout.write("\n")
1088 # Read a character from the standard input (`stdin
`).
1089 protected fun getc: Char
1091 return sys.stdin.read_char.ascii
1094 # Read a line from the standard input (`stdin
`).
1095 protected fun gets: String
1097 return sys.stdin.read_line
1100 # Return the working (current) directory
1101 protected fun getcwd: String do return file_getcwd.to_s
1102 private fun file_getcwd: NativeString is extern "string_NativeString_NativeString_file_getcwd_0"