PerlIO::via::Timeout(3pm)

Usage

  use Errno qw(ETIMEDOUT);
  use PerlIO::via::Timeout qw(:all);
  open my $fh, '<:via(Timeout)', 'foo.html';
  # set the timeout layer to be 0.5 second read timeout
  read_timeout($fh, 0.5);
  my $line = <$fh>;
  if ($line == undef && 0+$! == ETIMEDOUT) {
    # timed out
    ...
  }

Version

version 0.32

Overview

This package implements a PerlIO layer, that adds read / write timeout. This can be useful to avoid blocking while accessing a handle (file, socket, ...), and fail after some time.

The timeout is implemented by using "<select"> on the handle before reading/writing.

WARNING the handle won't timeout if you use "sysread" or "syswrite" on it, because these functions works at a lower level. However if you're trying to implement a timeout for a socket, see IO::Socket::Timeout that implements exactly that.

Functions

read_timeout

  # set a read timeout of 2.5 seconds
  read_timeout($fh, 2.5);
  # get the current read timeout
  my $secs = read_timeout($fh);

Getter / setter of the read timeout value.

write_timeout

  # set a write timeout of 2.5 seconds
  write_timeout($fh, 2.5);
  # get the current write timeout
  my $secs = write_timeout($fh);

Getter / setter of the write timeout value.

enable_timeout

  enable_timeout($fh);

Equivalent to setting timeout_enabled to 1

disable_timeout

  disable_timeout($fh);

Equivalent to setting timeout_enabled to 0

timeout_enabled

  # disable timeout
  timeout_enabled($fh, 0);
  # enable timeout
  timeout_enabled($fh, 1);
  # get the current status
  my $is_enabled = timeout_enabled($fh);

Getter / setter of the timeout enabled flag.

has_timeout_layer

  if (has_timeout_layer($fh)) {
    # set a write timeout of 2.5 seconds
    write_timeout($fh, 2.5);
  }

Returns whether the given filehandle is managed by PerlIO::via::Timeout.

Thanks to

Vincent Pit

Christian Hansen

Leon Timmmermans

Copyright and license

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

Releases

6 releases since Debian 8 (Jessie); the text changed 2 times.