7 IO::File - supply object methods for filehandles
14 if ($fh->open("< file")) {
19 $fh = new IO::File "> file";
25 $fh = new IO::File "file", "r";
28 undef $fh; # automatically closes the file
31 $fh = new IO::File "file", O_WRONLY|O_APPEND;
38 undef $fh; # automatically closes the file
45 C<IO::File> inherits from C<IO::Handle> and C<IO::Seekable>. It extends
46 these classes with methods that are specific to file handles.
54 Creates a C<IO::File>. If it receives any parameters, they are passed to
55 the method C<open>; if the open fails, the object is destroyed. Otherwise,
56 it is returned to the caller.
60 Creates an C<IO::File> opened for read/write on a newly created temporary
61 file. On systems where this is possible, the temporary file is anonymous
62 (i.e. it is unlinked after creation, but held open). If the temporary
63 file cannot be created or opened, the C<IO::File> object is destroyed.
64 Otherwise, it is returned to the caller.
72 =item open( FILENAME [,MODE [,PERMS]] )
74 C<open> accepts one, two or three parameters. With one parameter,
75 it is just a front end for the built-in C<open> function. With two
76 parameters, the first parameter is a filename that may include
77 whitespace or other special characters, and the second parameter is
78 the open mode, optionally followed by a file permission value.
80 If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.)
81 or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic
82 Perl C<open> operator.
84 If C<IO::File::open> is given a numeric mode, it passes that mode
85 and the optional permissions value to the Perl C<sysopen> operator.
86 For convenience, C<IO::File::import> tries to import the O_XXX
87 constants from the Fcntl module. If dynamic loading is not available,
88 this may fail, but the rest of IO::File will still work.
95 L<perlop/"I/O Operators">,
101 Derived from FileHandle.pm by Graham Barr E<lt>F<bodg@tiuk.ti.com>E<gt>.
107 use vars qw($VERSION @EXPORT @EXPORT_OK $AUTOLOAD @ISA);
111 use IO::Handle qw(_open_mode_string);
117 @ISA = qw(IO::Handle IO::Seekable Exporter DynaLoader);
121 @EXPORT = @IO::Seekable::EXPORT;
125 my $callpkg = caller;
126 Exporter::export $pkg, $callpkg, @_;
129 # If the Fcntl extension is available,
130 # export its constants for sysopen().
134 Exporter::export 'Fcntl', $callpkg, '/^O_/';
139 ################################################
145 my $class = ref($type) || $type || "IO::File";
147 or croak "usage: new $class [FILENAME [,MODE [,PERMS]]]";
148 my $fh = $class->SUPER::new();
156 ################################################
161 @_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])';
162 my ($fh, $file) = @_;
164 my ($mode, $perms) = @_[2, 3];
165 if ($mode =~ /^\d+$/) {
166 defined $perms or $perms = 0666;
167 return sysopen($fh, $file, $mode, $perms);
169 $file = "./" . $file unless $file =~ m#^/#;
170 $file = _open_mode_string($mode) . " $file\0";