process pipes

<[email protected]>
Newsgroups gmane.comp.gnu.m4.general
Message-ID <[email protected]> 
Hello, what is the treatment of processes using esyscmd in m4?

what becomes of stdin and the other file descriptors when a

process is invoked from within m4?

In what way might the output of a shell program be piped into an

m4 script so that it may be used as a filter program?
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