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List:       busybox
Subject:    RE: [PATCH] fsck: Fix incorrect handling of child exit
From:       <dietmar.schindler () manroland-web ! com>
Date:       2018-05-25 8:18:25
Message-ID: 71ce8c8fab1646ab94c6727e4606f100 () AUSMXMBX04 ! mrws ! biz
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> -----Original Message-----
> From: busybox [mailto:busybox-bounces@busybox.net] On Behalf Of Niklas Hambüchen
> Sent: Thursday, May 24, 2018 9:51 PM
> 
> …
> The way you do it now, using WEXITSTATUS in all cases where it's not WIFSIGNALED, \
> makes the assumption that WIFSIGNALED is the precise inverse of WIFEXITED.
> 
> But I haven't found the glibc (API) to make that guarantee anywhere.

There's, among other cases, this paragraph in The Open Group Base Specification \
http://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html:

"If the information pointed to by stat_loc was stored by a call to waitpid() that did \
not specify the WUNTRACED or WCONTINUED flags, or by a call to the wait() function, \
exactly one of the macros WIFEXITED(*stat_loc) and WIFSIGNALED(*stat_loc) shall \
                evaluate to a non-zero value."
--
Best regards,
Dietmar Schindler
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