IO(3pm) Perl Programmers Reference Guide IO(3pm)NAME
IO - load various IO modules
use IO qw(Handle File); # loads IO modules, here IO::Handle, IO::File
use IO; # DEPRECATED
"IO" provides a simple mechanism to load several of the IO modules in one go. The IO modules belonging to the core are:
Some other IO modules don't belong to the perl core but can be loaded as well if they have been installed from CPAN. You can discover
which ones exist by searching for "^IO::" on http://search.cpan.org.
For more information on any of these modules, please see its respective documentation.
use IO; # loads all the modules listed below
The loaded modules are IO::Handle, IO::Seekable, IO::File, IO::Pipe, IO::Socket, IO::Dir. You should instead explicitly import the IO
modules you want.
perl v5.16.2 2012-10-25 IO(3pm)
Check Out this Related Man Page
IO::Seekable(3pm) Perl Programmers Reference Guide IO::Seekable(3pm)NAME
IO::Seekable - supply seek based methods for I/O objects
@ISA = qw(IO::Seekable);
"IO::Seekable" does not have a constructor of its own as it is intended to be inherited by other "IO::Handle" based objects. It provides
methods which allow seeking of the file descriptors.
Returns an opaque value that represents the current position of the IO::File, or "undef" if this is not possible (eg an unseekable
stream such as a terminal, pipe or socket). If the fgetpos() function is available in your C library it is used to implements getpos,
else perl emulates getpos using C's ftell() function.
Uses the value of a previous getpos call to return to a previously visited position. Returns "0 but true" on success, "undef" on
See perlfunc for complete descriptions of each of the following supported "IO::Seekable" methods, which are just front ends for the
corresponding built-in functions:
$io->seek ( POS, WHENCE )
Seek the IO::File to position POS, relative to WHENCE:
POS is absolute position. (Seek relative to the start of the file)
POS is an offset from the current position. (Seek relative to current)
POS is an offset from the end of the file. (Seek relative to end)
The SEEK_* constants can be imported from the "Fcntl" module if you don't wish to use the numbers 0 1 or 2 in your code.
Returns 1 upon success, 0 otherwise.
$io->sysseek( POS, WHENCE )
Similar to $io->seek, but sets the IO::File's position using the system call lseek(2) directly, so will confuse most perl IO operators
except sysread and syswrite (see perlfunc for full details)
Returns the new position, or "undef" on failure. A position of zero is returned as the string "0 but true"
Returns the IO::File's current position, or -1 on error.
perlfunc, "I/O Operators" in perlop, IO::Handle IO::File
Derived from FileHandle.pm by Graham Barr <email@example.com>
perl v5.18.2 2013-11-04 IO::Seekable(3pm)
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