git: DragonFly_RELEASE_6_4 KERN_PROC - Fix KERN_PROC_ARGS and KERN_PROC_CWD to return length if oldptr==NULL.

[Aaron LI]

commit da6ab613212930cc7882ee107e8c9916e9a24d4b
Author: Imre Vadász <imre at vdsz.com>
Date:   Sun Jan 11 18:58:56 2026 +0100

    KERN_PROC - Fix KERN_PROC_ARGS and KERN_PROC_CWD to return length if oldptr==NULL.
    
    Sysctl handlers still have to compute the full output, even when
    oldptr == NULL. This is necessary to implement the behavior documented in
    sysctl(3), that it will return the required buffer length in "oldlenp", if
    "oldptr" is NULL and "oldlenp" is not NULL.

Summary of changes:
 sys/kern/kern_proc.c | 92 +++++++++++++++++++++++++---------------------------
 1 file changed, 45 insertions(+), 47 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/da6ab613212930cc7882ee107e8c9916e9a24d4b


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