pkg/util: Add pid information descriptors for FreeBSD

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

pkg/util/utils_freebsd.go

@@ -4,13 +4,29 @@
 package util
 
 import (
-	"errors"
-
 	"github.com/opencontainers/runtime-tools/generate"
 )
 
 func GetContainerPidInformationDescriptors() ([]string, error) {
-	return []string{}, errors.New("this function is not supported on freebsd")
+	// These are chosen to match the set of AIX format descriptors
+	// supported in Linux - FreeBSD ps does support (many) others.
+	return []string{
+		"args",
+		"comm",
+		"etime",
+		"group",
+		"nice",
+		"pcpu",
+		"pgid",
+		"pid",
+		"ppid",
+		"rgroup",
+		"ruser",
+		"time",
+		"tty",
+		"user",
+		"vsz",
+	}, nil
 }
 
 func AddPrivilegedDevices(g *generate.Generator, systemdMode bool) error {