7 IO::File - supply object methods for filehandles
14 if ($fh->open "< file") {
19 $fh = new IO::File "> FOO";
25 $fh = new IO::File "file", "r";
28 undef $fh; # automatically closes the file
31 $fh = new IO::File "file", O_WRONLY|O_APPEND;
34 undef $fh; # automatically closes the file
40 $fh->setvbuf($buffer_var, _IOLBF, 1024);
46 C<IO::File> inherits from C<IO::Handle> and C<IO::Seekable>. It extends
47 these classes with methods that are specific to file handles.
55 Creates a C<IO::File>. If it receives any parameters, they are passed to
56 the method C<open>; if the open fails, the object is destroyed. Otherwise,
57 it is returned to the caller.
65 =item open( FILENAME [,MODE [,PERMS]] )
67 C<open> accepts one, two or three parameters. With one parameter,
68 it is just a front end for the built-in C<open> function. With two
69 parameters, the first parameter is a filename that may include
70 whitespace or other special characters, and the second parameter is
71 the open mode, optionally followed by a file permission value.
73 If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.)
74 or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic
75 Perl C<open> operator.
77 If C<IO::File::open> is given a numeric mode, it passes that mode
78 and the optional permissions value to the Perl C<sysopen> operator.
79 For convenience, C<IO::File::import> tries to import the O_XXX
80 constants from the Fcntl module. If dynamic loading is not available,
81 this may fail, but the rest of IO::File will still work.
88 L<perlop/"I/O Operators">,
94 Derived from FileHandle.pm by Graham Barr E<lt>F<bodg@tiuk.ti.com>E<gt>.
100 use vars qw($VERSION @EXPORT @EXPORT_OK $AUTOLOAD @ISA);
104 use IO::Handle qw(_open_mode_string);
110 @ISA = qw(IO::Handle IO::Seekable Exporter DynaLoader);
114 @EXPORT = @IO::Seekable::EXPORT;
118 my $callpkg = caller;
119 Exporter::export $pkg, $callpkg, @_;
122 # If the Fcntl extension is available,
123 # export its constants for sysopen().
127 Exporter::export 'Fcntl', $callpkg, '/^O_/';
132 ################################################
138 my $class = ref($type) || $type || "IO::File";
140 or croak "usage: new $class [FILENAME [,MODE [,PERMS]]]";
141 my $fh = $class->SUPER::new();
149 ################################################
154 @_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])';
155 my ($fh, $file) = @_;
157 my ($mode, $perms) = @_[2, 3];
158 if ($mode =~ /^\d+$/) {
159 defined $perms or $perms = 0666;
160 return sysopen($fh, $file, $mode, $perms);
162 $file = "./" . $file unless $file =~ m#^/#;
163 $file = _open_mode_string($mode) . " $file\0";