[Bug 246381] popen(3) doesn't say if pclose sets errno when it returns -1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246381

            Bug ID: 246381
           Summary: popen(3) doesn't say if pclose sets errno when it
                    returns -1
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Documentation
          Assignee: doc at FreeBSD.org
          Reporter: yuri at freebsd.org

The relevant part of popen(3) looks like this and doesn't say anything errno
during pclose() failure.

>      The popen() function returns NULL if the fork(2) or pipe(2) calls fail,
>      or if it cannot allocate memory.
> 
>      The pclose() function returns -1 if stream is not associated with a
>      “popened” command, if stream already “pclosed”, or if wait4(2) returns an
>      error.
> 
> ERRORS
>      The popen() function does not reliably set errno.

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