From: Dmitry Bolshakov <lists@...>
Date: 2013-02-26T13:21:37+09:00
Subject: STDIN inheritance during exec and difference between getc and sysread

Hi all!

I've accidentally found that "getc" and "sysread" behave differently
after "exec"
getc does not get remaining data from the STDIN but sysread does it

bdimych@mint-vbox ~ $
bdimych@mint-vbox ~ $
bdimych@mint-vbox ~ $ echo -n ab | ruby -e "p STDIN.getc; exec 'ruby',
'-e', 'p STDIN.getc'"
"a"
nil
bdimych@mint-vbox ~ $
bdimych@mint-vbox ~ $ echo -n ab | ruby -e "p STDIN.sysread(1); exec
'ruby', '-e', 'p STDIN.sysread(1)'"
"a"
"b"
bdimych@mint-vbox ~ $
bdimych@mint-vbox ~ $
bdimych@mint-vbox ~ $

why so? where is "b" in the first case?

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