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Postings from October 2005
I do not think this effect is documented anywhere: perl -wle 'open F, q(<), shift or die; defined fork or die; open O, q(>x).$$; print O $_ while <F>' .article Two files x$$ are created (one per process). One of the them is empty. (Both on Solaris and OS/2; but this may be system-dependent.) Obviously, forked process share the same position in file. One of the culprits is the DATA file handle (see bug [perl #37119]): SelfLoader will work in only one of the processes (unless it already read the <DATA> section). [Sounds familiar; see http://groups.google.com/group/comp.lang.perl.modules/msg/ffafaf280e1423d7 ] It should be considered a bug in implementation of <DATA> handle. It must tell() initially and after each read, and seek() back before each read if any fork() was performed (drat, there is still a race condition; maybe it should dup() first...). Yours, Ilya P.S. How to reproduce: e.g., start perl -dwe0 in an XTerm (with ReadLine::Perl), then type fork Now type something to the command line in one terminal and press BackSpace key. After this BackSpace won't work in other terminal.Thread Next