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
375 # var content = "/etc/issue".to_path.read_all
379 # See `IStream::read_all` for details.
388 # Read all the lines of the file
391 # var lines = "/etc/passwd".to_path.read_lines
393 # print "{lines.length} users"
396 # var fields = l.split(":")
397 # print "name={fields[0]} uid={fields[2]}"
401 # See `IStream::read_lines` for details.
402 fun read_lines
: Array[String]
405 var res
= s
.read_lines
410 # Return an iterator on each line of the file
413 # for l in "/etc/passwd".to_path.each_line do
414 # var fields = l.split(":")
415 # print "name={fields[0]} uid={fields[2]}"
419 # Note: the stream is automatically closed at the end of the file (see `LineIterator::close_on_finish`)
421 # See `IStream::each_line` for details.
422 fun each_line
: LineIterator
425 var res
= s
.each_line
426 res
.close_on_finish
= true
431 # Lists the name of the files contained within the directory at `path`
433 # Require: `exists and is_dir`
434 fun files
: Array[Path]
436 var files
= new Array[Path]
437 for filename
in path
.files
do
438 files
.add
new Path(path
/ filename
)
443 # Delete a directory and all of its content, return `true` on success
445 # Does not go through symbolic links and may get stuck in a cycle if there
446 # is a cycle in the file system.
450 for file
in self.files
do
451 var stat
= file
.link_stat
453 ok
= file
.rmdir
and ok
455 ok
= file
.delete
and ok
459 # Delete the directory itself
460 if ok
then path
.to_cstring
.rmdir
465 redef fun ==(other
) do return other
isa Path and path
.simplify_path
== other
.path
.simplify_path
466 redef fun hash
do return path
.simplify_path
.hash
469 # Information on a file
471 # Created by `Path::stat` and `Path::link_stat`.
473 # The information within this class is gathered when the instance is initialized
474 # it will not be updated if the targeted file is modified.
480 # The low-level status of a file
483 private var stat
: NativeFileStat
485 private var finalized
= false
489 if not finalized
then
495 # Returns the last access time in seconds since Epoch
496 fun last_access_time
: Int
502 # Returns the last modification time in seconds since Epoch
503 fun last_modification_time
: Int
509 # Size of the file at `path`
516 # Is this a regular file and not a device file, pipe, socket, etc.?
523 # Is this a directory?
530 # Is this a symbolic link?
537 # FIXME Make the following POSIX only? or implement in some other way on Windows
539 # Returns the last status change time in seconds since Epoch
540 fun last_status_change_time
: Int
546 # Returns the permission bits of file
553 # Is this a character device?
560 # Is this a block device?
567 # Is this a FIFO pipe?
574 # Is this a UNIX socket
583 # Access file system related services on the path at `self`
584 fun to_path
: Path do return new Path(to_s
)
588 # return true if a file with this names exists
589 fun file_exists
: Bool do return to_cstring
.file_exists
591 # The status of a file. see POSIX stat(2).
592 fun file_stat
: NativeFileStat do return to_cstring
.file_stat
594 # The status of a file or of a symlink. see POSIX lstat(2).
595 fun file_lstat
: NativeFileStat do return to_cstring
.file_lstat
597 # Remove a file, return true if success
598 fun file_delete
: Bool do return to_cstring
.file_delete
600 # Copy content of file at `self` to `dest`
601 fun file_copy_to
(dest
: String) do to_path
.copy
(dest
.to_path
)
603 # Remove the trailing extension `ext`.
605 # `ext` usually starts with a dot but could be anything.
607 # assert "file.txt".strip_extension(".txt") == "file"
608 # assert "file.txt".strip_extension("le.txt") == "fi"
609 # assert "file.txt".strip_extension("xt") == "file.t"
611 # if `ext` is not present, `self` is returned unmodified.
613 # assert "file.txt".strip_extension(".tar.gz") == "file.txt"
614 fun strip_extension
(ext
: String): String
616 if has_suffix
(ext
) then
617 return substring
(0, length
- ext
.length
)
622 # Extract the basename of a path and remove the extension
624 # assert "/path/to/a_file.ext".basename(".ext") == "a_file"
625 # assert "path/to/a_file.ext".basename(".ext") == "a_file"
626 # assert "path/to".basename(".ext") == "to"
627 # assert "path/to/".basename(".ext") == "to"
628 # assert "path".basename("") == "path"
629 # assert "/path".basename("") == "path"
630 # assert "/".basename("") == "/"
631 # assert "".basename("") == ""
632 fun basename
(ext
: String): String
634 var l
= length
- 1 # Index of the last char
635 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
636 if l
== 0 then return "/"
637 var pos
= chars
.last_index_of_from
('/', l
)
640 n
= substring
(pos
+1, l-pos
)
642 return n
.strip_extension
(ext
)
645 # Extract the dirname of a path
647 # assert "/path/to/a_file.ext".dirname == "/path/to"
648 # assert "path/to/a_file.ext".dirname == "path/to"
649 # assert "path/to".dirname == "path"
650 # assert "path/to/".dirname == "path"
651 # assert "path".dirname == "."
652 # assert "/path".dirname == "/"
653 # assert "/".dirname == "/"
654 # assert "".dirname == "."
657 var l
= length
- 1 # Index of the last char
658 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
659 var pos
= chars
.last_index_of_from
('/', l
)
661 return substring
(0, pos
)
662 else if pos
== 0 then
669 # Return the canonicalized absolute pathname (see POSIX function `realpath`)
670 fun realpath
: String do
671 var cs
= to_cstring
.file_realpath
672 var res
= cs
.to_s_with_copy
673 # cs.free_malloc # FIXME memory leak
677 # Simplify a file path by remove useless ".", removing "//", and resolving ".."
678 # ".." are not resolved if they start the path
679 # starting "/" is not removed
680 # trainling "/" is removed
682 # Note that the method only wonrk on the string:
684 # * no I/O access is performed
685 # * the validity of the path is not checked
688 # assert "some/./complex/../../path/from/../to/a////file//".simplify_path == "path/to/a/file"
689 # assert "../dir/file".simplify_path == "../dir/file"
690 # assert "dir/../../".simplify_path == ".."
691 # assert "dir/..".simplify_path == "."
692 # assert "//absolute//path/".simplify_path == "/absolute/path"
693 # assert "//absolute//../".simplify_path == "/"
695 fun simplify_path
: String
697 var a
= self.split_with
("/")
698 var a2
= new Array[String]
700 if x
== "." then continue
701 if x
== "" and not a2
.is_empty
then continue
702 if x
== ".." and not a2
.is_empty
and a2
.last
!= ".." then
708 if a2
.is_empty
then return "."
709 if a2
.length
== 1 and a2
.first
== "" then return "/"
713 # Correctly join two path using the directory separator.
715 # Using a standard "{self}/{path}" does not work in the following cases:
718 # * `path` ends with `'/'`.
719 # * `path` starts with `'/'`.
721 # This method ensures that the join is valid.
723 # assert "hello".join_path("world") == "hello/world"
724 # assert "hel/lo".join_path("wor/ld") == "hel/lo/wor/ld"
725 # assert "".join_path("world") == "world"
726 # assert "hello".join_path("/world") == "/world"
727 # assert "hello/".join_path("world") == "hello/world"
728 # assert "hello/".join_path("/world") == "/world"
730 # Note: You may want to use `simplify_path` on the result.
732 # Note: This method works only with POSIX paths.
733 fun join_path
(path
: String): String
735 if path
.is_empty
then return self
736 if self.is_empty
then return path
737 if path
.chars
[0] == '/' then return path
738 if self.last
== '/' then return "{self}{path}"
739 return "{self}/{path}"
742 # Convert the path (`self`) to a program name.
744 # Ensure the path (`self`) will be treated as-is by POSIX shells when it is
745 # used as a program name. In order to do that, prepend `./` if needed.
747 # assert "foo".to_program_name == "./foo"
748 # assert "/foo".to_program_name == "/foo"
749 # assert "".to_program_name == "./" # At least, your shell will detect the error.
750 fun to_program_name
: String do
751 if self.has_prefix
("/") then
758 # Alias for `join_path`
760 # assert "hello" / "world" == "hello/world"
761 # assert "hel/lo" / "wor/ld" == "hel/lo/wor/ld"
762 # assert "" / "world" == "world"
763 # assert "/hello" / "/world" == "/world"
765 # This operator is quite useful for chaining changes of path.
766 # The next one being relative to the previous one.
770 # var c = "baz/foobar"
771 # assert a/b/c == "/bar/baz/foobar"
772 fun /(path
: String): String do return join_path
(path
)
774 # Returns the relative path needed to go from `self` to `dest`.
776 # assert "/foo/bar".relpath("/foo/baz") == "../baz"
777 # assert "/foo/bar".relpath("/baz/bar") == "../../baz/bar"
779 # If `self` or `dest` is relative, they are considered relatively to `getcwd`.
781 # In some cases, the result is still independent of the current directory:
783 # assert "foo/bar".relpath("..") == "../../.."
785 # In other cases, parts of the current directory may be exhibited:
787 # var p = "../foo/bar".relpath("baz")
788 # var c = getcwd.basename("")
789 # assert p == "../../{c}/baz"
791 # For path resolution independent of the current directory (eg. for paths in URL),
792 # or to use an other starting directory than the current directory,
793 # just force absolute paths:
795 # var start = "/a/b/c/d"
796 # var p2 = (start/"../foo/bar").relpath(start/"baz")
797 # assert p2 == "../../d/baz"
800 # Neither `self` or `dest` has to be real paths or to exist in directories since
801 # the resolution is only done with string manipulations and without any access to
802 # the underlying file system.
804 # If `self` and `dest` are the same directory, the empty string is returned:
806 # assert "foo".relpath("foo") == ""
807 # assert "foo/../bar".relpath("bar") == ""
809 # The empty string and "." designate both the current directory:
811 # assert "".relpath("foo/bar") == "foo/bar"
812 # assert ".".relpath("foo/bar") == "foo/bar"
813 # assert "foo/bar".relpath("") == "../.."
814 # assert "/" + "/".relpath(".") == getcwd
815 fun relpath
(dest
: String): String
818 var from
= (cwd
/self).simplify_path
.split
("/")
819 if from
.last
.is_empty
then from
.pop
# case for the root directory
820 var to
= (cwd
/dest
).simplify_path
.split
("/")
821 if to
.last
.is_empty
then to
.pop
# case for the root directory
823 # Remove common prefixes
824 while not from
.is_empty
and not to
.is_empty
and from
.first
== to
.first
do
829 # Result is going up in `from` with ".." then going down following `to`
830 var from_len
= from
.length
831 if from_len
== 0 then return to
.join
("/")
832 var up
= "../"*(from_len-1
) + ".."
833 if to
.is_empty
then return up
834 var res
= up
+ "/" + to
.join
("/")
838 # Create a directory (and all intermediate directories if needed)
841 var dirs
= self.split_with
("/")
842 var path
= new FlatBuffer
843 if dirs
.is_empty
then return
844 if dirs
[0].is_empty
then
845 # it was a starting /
849 if d
.is_empty
then continue
852 path
.to_s
.to_cstring
.file_mkdir
856 # Delete a directory and all of its content, return `true` on success
858 # Does not go through symbolic links and may get stuck in a cycle if there
859 # is a cycle in the filesystem.
860 fun rmdir
: Bool do return to_path
.rmdir
862 # Change the current working directory
865 # assert getcwd == "/etc"
867 # assert getcwd == "/"
870 fun chdir
do to_cstring
.file_chdir
872 # Return right-most extension (without the dot)
874 # Only the last extension is returned.
875 # There is no special case for combined extensions.
877 # assert "file.txt".file_extension == "txt"
878 # assert "file.tar.gz".file_extension == "gz"
880 # For file without extension, `null` is returned.
881 # Hoever, for trailing dot, `""` is returned.
883 # assert "file".file_extension == null
884 # assert "file.".file_extension == ""
886 # The starting dot of hidden files is never considered.
888 # assert ".file.txt".file_extension == "txt"
889 # assert ".file".file_extension == null
890 fun file_extension
: nullable String
892 var last_slash
= chars
.last_index_of
('.')
893 if last_slash
> 0 then
894 return substring
( last_slash
+1, length
)
900 # returns files contained within the directory represented by self
901 fun files
: Array[String] is extern import Array[String], Array[String].add
, NativeString.to_s
, String.to_cstring
`{
905 dir_path = String_to_cstring( recv );
906 if ((dir = opendir(dir_path)) == NULL)
913 Array_of_String results;
917 results = new_Array_of_String();
919 while ( ( de = readdir( dir ) ) != NULL )
920 if ( strcmp( de->d_name, ".." ) != 0 &&
921 strcmp( de->d_name, "." ) != 0 )
923 file_name = NativeString_to_s( strdup( de->d_name ) );
924 Array_of_String_add( results, file_name );
933 redef class NativeString
934 private fun file_exists
: Bool is extern "string_NativeString_NativeString_file_exists_0"
935 private fun file_stat
: NativeFileStat is extern "string_NativeString_NativeString_file_stat_0"
936 private fun file_lstat
: NativeFileStat `{
937 struct stat* stat_element;
939 stat_element = malloc(sizeof(struct stat));
940 res = lstat(recv, stat_element);
941 if (res == -1) return NULL;
944 private fun file_mkdir
: Bool is extern "string_NativeString_NativeString_file_mkdir_0"
945 private fun rmdir
: Bool `{ return rmdir(recv); `}
946 private fun file_delete: Bool is extern "string_NativeString_NativeString_file_delete_0"
947 private fun file_chdir is extern "string_NativeString_NativeString_file_chdir_0"
948 private fun file_realpath: NativeString is extern "file_NativeString_realpath"
951 # This class is system dependent ... must reify the vfs
952 extern class NativeFileStat `{ struct stat * `}
953 # Returns the permission bits of file
954 fun mode
: Int is extern "file_FileStat_FileStat_mode_0"
955 # Returns the last access time
956 fun atime
: Int is extern "file_FileStat_FileStat_atime_0"
957 # Returns the last status change time
958 fun ctime
: Int is extern "file_FileStat_FileStat_ctime_0"
959 # Returns the last modification time
960 fun mtime
: Int is extern "file_FileStat_FileStat_mtime_0"
962 fun size
: Int is extern "file_FileStat_FileStat_size_0"
964 # Returns true if it is a regular file (not a device file, pipe, sockect, ...)
965 fun is_reg
: Bool `{ return S_ISREG(recv->st_mode); `}
966 # Returns true if it is a directory
967 fun is_dir: Bool `{ return S_ISDIR(recv->st_mode); `}
968 # Returns true if it is a character device
969 fun is_chr
: Bool `{ return S_ISCHR(recv->st_mode); `}
970 # Returns true if it is a block device
971 fun is_blk: Bool `{ return S_ISBLK(recv->st_mode); `}
972 # Returns true if the type is fifo
973 fun is_fifo
: Bool `{ return S_ISFIFO(recv->st_mode); `}
974 # Returns true if the type is a link
975 fun is_lnk: Bool `{ return S_ISLNK(recv->st_mode); `}
976 # Returns true if the type is a socket
977 fun is_sock
: Bool `{ return S_ISSOCK(recv->st_mode); `}
980 # Instance of this class are standard FILE * pointers
981 private extern class NativeFile `{ FILE* `}
982 fun io_read
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_read_2"
983 fun io_write
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_write_2"
984 fun io_close
: Int is extern "file_NativeFile_NativeFile_io_close_0"
985 fun file_stat
: NativeFileStat is extern "file_NativeFile_NativeFile_file_stat_0"
986 fun fileno
: Int `{ return fileno(recv); `}
987 # Flushes the buffer, forcing the write operation
988 fun flush: Int is extern "fflush"
989 # Used to specify how the buffering will be handled for the current stream.
990 fun set_buffering_type(buf_length: Int, mode: Int): Int is extern "file_NativeFile_NativeFile_set_buffering_type_0"
992 new io_open_read(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_read_1"
993 new io_open_write(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_write_1"
994 new native_stdin is extern "file_NativeFileCapable_NativeFileCapable_native_stdin_0"
995 new native_stdout is extern "file_NativeFileCapable_NativeFileCapable_native_stdout_0"
996 new native_stderr is extern "file_NativeFileCapable_NativeFileCapable_native_stderr_0"
1002 if stdout isa FStream then stdout.as(FStream).set_buffering_mode(256, buffer_mode_line)
1006 var stdin: PollableIStream = new Stdin is protected writable
1009 var stdout: OStream = new Stdout is protected writable
1011 # Standard output for errors
1012 var stderr: OStream = new Stderr is protected writable
1014 # Enumeration for buffer mode full (flushes when buffer is full)
1015 fun buffer_mode_full: Int is extern "file_Sys_Sys_buffer_mode_full_0"
1016 # Enumeration for buffer mode line (flushes when a `\n
` is encountered)
1017 fun buffer_mode_line: Int is extern "file_Sys_Sys_buffer_mode_line_0"
1018 # Enumeration for buffer mode none (flushes ASAP when something is written)
1019 fun buffer_mode_none: Int is extern "file_Sys_Sys_buffer_mode_none_0"
1021 # returns first available stream to read or write to
1022 # return null on interruption (possibly a signal)
1023 protected fun poll( streams : Sequence[FStream] ) : nullable FStream
1025 var in_fds = new Array[Int]
1026 var out_fds = new Array[Int]
1027 var fd_to_stream = new HashMap[Int,FStream]
1030 if s isa IFStream then in_fds.add( fd )
1031 if s isa OFStream then out_fds.add( fd )
1033 fd_to_stream[fd] = s
1036 var polled_fd = intern_poll( in_fds, out_fds )
1038 if polled_fd == null then
1041 return fd_to_stream[polled_fd]
1045 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) `{
1046 int in_len
, out_len
, total_len
;
1047 struct pollfd
*c_fds
;
1050 int first_polled_fd
= -1;
1053 in_len
= Array_of_Int_length( in_fds
);
1054 out_len
= Array_of_Int_length( out_fds
);
1055 total_len
= in_len
+ out_len
;
1056 c_fds
= malloc
( sizeof
(struct pollfd
) * total_len
);
1059 for ( i
=0; i
<in_len
; i
++ ) {
1061 fd
= Array_of_Int__index( in_fds
, i
);
1064 c_fds
[i
].events
= POLLIN;
1067 /* output streams
*/
1068 for ( i
=0; i
<out_len
; i
++ ) {
1070 fd
= Array_of_Int__index( out_fds
, i
);
1073 c_fds
[i
].events
= POLLOUT;
1076 /* poll all fds
, unlimited timeout
*/
1077 result
= poll
( c_fds
, total_len
, -1 );
1080 /* analyse results
*/
1081 for ( i
=0; i
<total_len
; i
++ )
1082 if ( c_fds
[i
].revents
& c_fds
[i
].events
|| /* awaited event
*/
1083 c_fds
[i
].revents
& POLLHUP ) /* closed
*/
1085 first_polled_fd
= c_fds
[i
].fd
;
1089 return Int_as_nullable( first_polled_fd
);
1091 else if ( result
< 0 )
1092 fprintf
( stderr
, "Error in Stream:poll: %s\n", strerror
( errno
) );
1099 # Print `objects
` on the standard output (`stdout
`).
1100 protected fun printn(objects: Object...)
1102 sys.stdout.write(objects.to_s)
1105 # Print an `object
` on the standard output (`stdout
`) and add a newline.
1106 protected fun print(object: Object)
1108 sys.stdout.write(object.to_s)
1109 sys.stdout.write("\n")
1112 # Read a character from the standard input (`stdin
`).
1113 protected fun getc: Char
1115 return sys.stdin.read_char.ascii
1118 # Read a line from the standard input (`stdin
`).
1119 protected fun gets: String
1121 return sys.stdin.read_line
1124 # Return the working (current) directory
1125 protected fun getcwd: String do return file_getcwd.to_s
1126 private fun file_getcwd: NativeString is extern "string_NativeString_NativeString_file_getcwd_0"