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Re: standards/51024 (NetBSD misses the mandatory waitid() syscall)
The following reply was made to PR standards/51024; it has been noted by GNATS.
From: christos%zoulas.com@localhost (Christos Zoulas)
To: Joerg Schilling <Joerg.Schilling%fokus.fraunhofer.de@localhost>, <wiz%netbsd.org@localhost>,
Subject: Re: standards/51024 (NetBSD misses the mandatory waitid() syscall)
Date: Mon, 4 Apr 2016 10:08:07 -0400
On Apr 4, 2:48pm, Joerg.Schilling%fokus.fraunhofer.de@localhost (Joerg Schilling) wrote:
-- Subject: Re: standards/51024 (NetBSD misses the mandatory waitid() syscall
| Thank you for your work!
| I do not have netbsd installed, so I checked the sources.
| 1) I do not see any changes in the signal handling.
| Is siginfo_t filled correctly in for the signalhandler
| that handles SIGCHLD? It should deliver the same
| information as waitid() delivers, including the full 32 bits
| from the exit() call in the child.
Do you have the reference where it says it needs to preserve all 32 bits
of exit code? I have not found one.
| 2) kern_exit.c does not look correct (complete).
| If you really like to keep the deprecated wait status in the kernel,
| you should use a more complete conversion code to convert the
| deprecated wait status into siginfo_t. A correct piece of code
| is in the compatibility code of the recent Bourne Shell:
| Source code is in the schily tools:
| Use latest *schily-*' tar archive.
| Check the bottom of the file sh/jobs.c
I'll take a look.
| 3) From what I can tell, the new netbsd waitid() code only delivers
| the low 8 bits from the exit() parameter. This is incorrect.
| waitid() was introduced in 1989 by AT&T for SVr4 and defines to
| deliver all 32 bits from the exit() call of the child.
| Given that POSIX does not introcude own definitions but just
| standardizes existing implementations, it should be obvious that
| the SVID3 interface definitions apply to the POSIX waitid() call.
| As a hint, here is the currenty valid relevant POSIX text:
| the least significant 8 bits (that is, status & 0377) shall be
| available from wait() and waitpid(); the full value shall
| be available from waitid() and in the siginfo_t passed to a
| signal handler for SIGCHLD.
| I hope that you are interested in full POSIX compliance with waitid() as
| waitid() is part of the basic set of interfaces.
Yes, and I know how to do that; the question is, where is it spelled in
the docs that the full 32 bits of exit code need to be preserved?
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