PR/53931 CVS commit: src/tests/lib/libc/sys

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR kern/53931; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/53931 CVS commit: src/tests/lib/libc/sys
Date: Sun, 6 Apr 2025 19:18:01 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sun Apr  6 19:18:01 UTC 2025
 
 Modified Files:
 	src/tests/lib/libc/sys: t_posix_fadvise.c
 
 Log Message:
 t_posix_fadvise: Don't check whether errno is preserved.
 
 I can find no guarantee in POSIX about posix_fadvise preserving
 errno; until such language is found I'm going to assume there is no
 such guarantee.
 
 What is happening is that, sometimes, rump_sys_posix_fadvise waits on
 a mutex or condvar, which uses _lwp_park internally, which sometimes
 wakes up early with EALREADY because a wakeup was already pending for
 the thread by the time it entered _lwp_park.  And that EALREADY is
 delivered by _lwp_park via errno.
 
 PR kern/53931: posix_fadvise_reg test case fails randomly on real
 hardware
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.3 -r1.4 src/tests/lib/libc/sys/t_posix_fadvise.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.