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> Is there some reason why we aren't discussing this on the mailing > list? Which mailing list? I'm not on the cygwin list. > >POSIX shells are required to remember at least CHILD_MAX (but > >optionally more) process statuses. There is a gray area about whether > >or not the user can query the status of those processes, implying that > >once the status of a background or foreground job has been reported, > >its status, and the status of its constituent processes, can be > >discarded, but those rules are hard to decipher. > > Are you saying that waitpid should be able to return the status of an > exited process when it is called repeatedly? I've never seen anything > like that. I thought that once you'd done a wait the process was > unzombified, it goes away, and it is unavailable for future querying. No. The portion of the POSIX spec describing the shell's behavior is independent of the exact function used to query a process's status. It says the shell has to remember. It doesn't mention waitpid(), nor does it need to. You're assuming that the shell just does a waitpid() whenever it needs to get a particular process's status. No shell does it that way. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ( ``Discere est Dolere'' -- chet ) Live...Laugh...Love Chet Ramey, ITS, CWRU chet AT po DOT cwru DOT edu http://tiswww.tis.cwru.edu/~chet/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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