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Close command used to determine file size #10

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Close command used to determine file size #10

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Commits on Aug 14, 2018

  1. Close command used to determine file size 

    When an AWK program reads from a file or process, AWK keeps the
connection to the file or process open until the program explicitly
closes it. This is useful in order to read multiple lines from a file,
or to keep reading input from a long-running coprocess, but it also
means that we must make sure to close any short helper program we
launch, otherwise we will leak one file descriptor (the pipe to the
child process) per invocation and eventually run out of file descriptors
(EMFILE Too many open files). (See also the time() function for an
example where we already do this.)

Fixes dspinellis#9.
    @lucaswerkmeister
    lucaswerkmeister committed Aug 14, 2018
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