kcmp(2): implement for procdesc

(cherry picked from commit f006524d6d696cc2a10b9e90a9a6ea412f1839eb)

1 files changed, 14 insertions, 0 deletions

diff --git a/sys/kern/sys_procdesc.c b/sys/kern/sys_procdesc.c
index ac94c3b44730..e8e0efd5bb00 100644
--- a/sys/kern/sys_procdesc.c
+++ b/sys/kern/sys_procdesc.c
@@ -97,6 +97,7 @@ static fo_kqfilter_t	procdesc_kqfilter;
 static fo_stat_t	procdesc_stat;
 static fo_close_t	procdesc_close;
 static fo_fill_kinfo_t	procdesc_fill_kinfo;
+static fo_cmp_t		procdesc_cmp;
 
 static struct fileops procdesc_ops = {
 	.fo_read = invfo_rdwr,
@@ -111,6 +112,7 @@ static struct fileops procdesc_ops = {
 	.fo_chown = invfo_chown,
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = procdesc_fill_kinfo,
+	.fo_cmp = procdesc_cmp,
 	.fo_flags = DFLAG_PASSABLE,
 };
 
@@ -555,3 +557,15 @@ procdesc_fill_kinfo(struct file *fp, struct kinfo_file *kif,
 	kif->kf_un.kf_proc.kf_pid = pdp->pd_pid;
 	return (0);
 }
+
+static int
+procdesc_cmp(struct file *fp1, struct file *fp2, struct thread *td)
+{
+	struct procdesc *pdp1, *pdp2;
+
+	if (fp2->f_type != DTYPE_PROCDESC)
+		return (3);
+	pdp1 = fp1->f_data;
+	pdp2 = fp2->f_data;
+	return (kcmp_cmp((uintptr_t)pdp1->pd_pid, (uintptr_t)pdp2->pd_pid));
+}