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Index: head/bin/ps/ps.c
===================================================================
--- head/bin/ps/ps.c
+++ head/bin/ps/ps.c
@@ -523,7 +523,11 @@
*/
nentries = -1;
kp = kvm_getprocs(kd, what, flag, &nentries);
- if ((kp == NULL && nentries > 0) || (kp != NULL && nentries < 0))
+ /*
+ * Ignore ESRCH to preserve behaviour of "ps -p nonexistent-pid"
+ * not reporting an error.
+ */
+ if ((kp == NULL && errno != ESRCH) || (kp != NULL && nentries < 0))
xo_errx(1, "%s", kvm_geterr(kd));
nkept = 0;
if (nentries > 0) {

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