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-=head1 NAME
-
-IPC::Open2, open2 - open a process for both reading and writing
-
-=head1 SYNOPSIS
-
- use IPC::Open2;
- $pid = open2('rdr', 'wtr', 'some cmd and args');
- # or
- $pid = open2('rdr', 'wtr', 'some', 'cmd', 'and', 'args');
-
-=head1 DESCRIPTION
-
-The open2() function spawns the given $cmd and connects $rdr for
-reading and $wtr for writing. It's what you think should work
-when you try
-
- open(HANDLE, "|cmd args");
-
-open2() returns the process ID of the child process. It doesn't return on
-failure: it just raises an exception matching C</^open2:/>.
-
-=head1 WARNING
-
-It will not create these file handles for you. You have to do this yourself.
-So don't pass it empty variables expecting them to get filled in for you.
-
-Additionally, this is very dangerous as you may block forever.
-It assumes it's going to talk to something like B<bc>, both writing to
-it and reading from it. This is presumably safe because you "know"
-that commands like B<bc> will read a line at a time and output a line at
-a time. Programs like B<sort> that read their entire input stream first,
-however, are quite apt to cause deadlock.
-
-The big problem with this approach is that if you don't have control
-over source code being run in the the child process, you can't control what it does
-with pipe buffering. Thus you can't just open a pipe to "cat -v" and continually
-read and write a line from it.
-
-=head1 SEE ALSO
-
-See L<open3> for an alternative that handles STDERR as well.
-