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Diffstat (limited to 'pod/modpods/Open2.pod')
-rw-r--r-- | pod/modpods/Open2.pod | 43 |
1 files changed, 0 insertions, 43 deletions
diff --git a/pod/modpods/Open2.pod b/pod/modpods/Open2.pod deleted file mode 100644 index 942f68446d..0000000000 --- a/pod/modpods/Open2.pod +++ /dev/null @@ -1,43 +0,0 @@ -=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. - |