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diff --git a/lib/libsys/kqueue.2 b/lib/libsys/kqueue.2
--- a/lib/libsys/kqueue.2
+++ b/lib/libsys/kqueue.2
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd January 24, 2026
+.Dd July 22, 2026
.Dt KQUEUE 2
.Os
.Sh NAME
@@ -543,9 +543,15 @@
.Va data
in the same format as the status returned by
.Xr wait 2 .
+.It Dv NOTE_REAP
+The process has been reaped by a call to the
+.Xr wait 2
+family of functions.
.It Dv NOTE_FORK
The process has called
-.Fn fork .
+.Xr fork 2
+or
+.Xr vfork 2 .
.It Dv NOTE_EXEC
The process has executed a new process via
.Xr execve 2
diff --git a/lib/libsysdecode/flags.c b/lib/libsysdecode/flags.c
--- a/lib/libsysdecode/flags.c
+++ b/lib/libsysdecode/flags.c
@@ -377,7 +377,7 @@
};
static struct name_table kevent_proc_fflags[] = {
- X(NOTE_EXIT) X(NOTE_FORK) X(NOTE_EXEC) X(NOTE_PDSIGCHLD)
+ X(NOTE_EXIT) X(NOTE_FORK) X(NOTE_EXEC) X(NOTE_PDSIGCHLD) X(NOTE_REAP)
X(NOTE_TRACK) X(NOTE_TRACKERR) X(NOTE_CHILD) XEND
};
diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c
--- a/sys/kern/kern_event.c
+++ b/sys/kern/kern_event.c
@@ -445,7 +445,7 @@
bool exiting, immediate;
exiting = immediate = false;
- if (kn->kn_sfflags & NOTE_EXIT)
+ if (kn->kn_sfflags & (NOTE_EXIT | NOTE_REAP))
p = pfind_any(kn->kn_id);
else
p = pfind(kn->kn_id);
@@ -470,7 +470,7 @@
kn->kn_flags &= ~EV_FLAG2;
kn->kn_data = kn->kn_sdata; /* ppid */
kn->kn_fflags = NOTE_CHILD;
- kn->kn_sfflags &= ~(NOTE_EXIT | NOTE_EXEC | NOTE_FORK);
+ kn->kn_sfflags &= ~NOTE_PCTRLMASK;
immediate = true; /* Force immediate activation of child note. */
}
/*
@@ -532,12 +532,15 @@
if ((kn->kn_sfflags & event) != 0)
kn->kn_fflags |= kn->kn_sfflags & event;
+ /* Report exit status */
+ if ((kn->kn_fflags & NOTE_EXIT) != 0)
+ kn->kn_data = KW_EXITCODE(p->p_xexit, p->p_xsig);
+
/* Process is gone, so flag the event as finished. */
- if ((event & NOTE_EXIT) != 0) {
+ if ((event & NOTE_REAP) != 0 ||
+ ((event & NOTE_EXIT) != 0 && (kn->kn_sfflags & NOTE_REAP) == 0)) {
kn->kn_flags |= EV_EOF | EV_ONESHOT;
kn->kn_ptr.p_proc = NULL;
- if (kn->kn_fflags & NOTE_EXIT)
- kn->kn_data = KW_EXITCODE(p->p_xexit, p->p_xsig);
if (kn->kn_fflags == 0)
kn->kn_flags |= EV_DROP;
return (1);
diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -1055,6 +1055,7 @@
sx_xunlock(&proctree_lock);
PROC_LOCK(p);
+ KNOTE_LOCKED(p->p_klist, NOTE_REAP);
knlist_detach(p->p_klist);
p->p_klist = NULL;
PROC_UNLOCK(p);
diff --git a/sys/kern/sys_procdesc.c b/sys/kern/sys_procdesc.c
--- a/sys/kern/sys_procdesc.c
+++ b/sys/kern/sys_procdesc.c
@@ -507,11 +507,14 @@
if ((kn->kn_sfflags & event) != 0)
kn->kn_fflags |= kn->kn_sfflags & event;
+ /* Report exit status */
+ if ((kn->kn_fflags & NOTE_EXIT) != 0)
+ kn->kn_data = pd->pd_xstat;
+
/* Process is gone, so flag the event as finished. */
- if ((event & NOTE_EXIT) != 0) {
+ if ((event & NOTE_REAP) != 0 ||
+ ((event & NOTE_EXIT) != 0 && (kn->kn_sfflags & NOTE_REAP) == 0)) {
kn->kn_flags |= EV_EOF | EV_ONESHOT;
- if (kn->kn_fflags & NOTE_EXIT)
- kn->kn_data = pd->pd_xstat;
if (kn->kn_fflags == 0)
kn->kn_flags |= EV_DROP;
return (1);
diff --git a/sys/sys/event.h b/sys/sys/event.h
--- a/sys/sys/event.h
+++ b/sys/sys/event.h
@@ -209,7 +209,10 @@
#define NOTE_EXEC 0x20000000 /* proc: process exec'd */
#define NOTE_PDSIGCHLD 0x10000000 /* procdesc: pdwait() info
available */
-#define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
+#define NOTE_SIGNAL 0x08000000 /* process received a signal,
+ shared with EVFIL_SIGNAL */
+#define NOTE_REAP 0x04000000 /* process reaped */
+#define NOTE_PCTRLMASK 0xfc000000 /* mask for hint bits */
#define NOTE_PDATAMASK 0x000fffff /* mask for pid */
/* additional flags for EVFILT_PROC */
@@ -263,12 +266,6 @@
#define KNLIST_EMPTY(list) SLIST_EMPTY(&(list)->kl_list)
-/*
- * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
- * shared by EVFILT_PROC (all knotes attached to p->p_klist)
- */
-#define NOTE_SIGNAL 0x08000000
-
/*
* Hint values for the optional f_touch event filter. If f_touch is not set
* to NULL and f_isfd is zero the f_touch filter will be called with the type

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