psgo: handle ESRCH as ENOENT

internal/proc/attr.go

@@ -15,10 +15,13 @@
 package proc
 
 import (
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"strings"
+
+	"golang.org/x/sys/unix"
 )
 
 // ParseAttrCurrent returns the contents of /proc/$pid/attr/current of "?" if
@@ -27,7 +30,7 @@ func ParseAttrCurrent(pid string) (string, error) {
 	data, err := ioutil.ReadFile(fmt.Sprintf("/proc/%s/attr/current", pid))
 	if err != nil {
 		_, err = os.Stat(fmt.Sprintf("/proc/%s", pid))
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) || errors.Is(err, unix.ESRCH) {
 			// PID doesn't exist
 			return "", err
 		}

internal/process/process.go

@@ -24,6 +24,7 @@ import (
 	"github.com/containers/psgo/internal/host"
 	"github.com/containers/psgo/internal/proc"
 	"github.com/opencontainers/runc/libcontainer/user"
+	"golang.org/x/sys/unix"
 )
 
 // Process includes process-related from the /proc FS.
@@ -108,7 +109,7 @@ func FromPIDs(pids []string, joinUserNS bool) ([]*Process, error) {
 	for _, pid := range pids {
 		p, err := New(pid, joinUserNS)
 		if err != nil {
-			if errors.Is(err, os.ErrNotExist) {
+			if errors.Is(err, os.ErrNotExist) || errors.Is(err, unix.ESRCH) {
 				// proc parsing is racy
 				// Let's ignore "does not exist" errors
 				continue

psgo.go

@@ -477,7 +477,7 @@ func JoinNamespaceAndProcessInfoByPidsWithOptions(pids []string, descriptors []s
 	for _, pid := range pids {
 		ns, err := proc.ParsePIDNamespace(pid)
 		if err != nil {
-			if errors.Is(err, os.ErrNotExist) {
+			if errors.Is(err, os.ErrNotExist) || errors.Is(err, unix.ESRCH) {
 				// catch race conditions
 				continue
 			}
@@ -492,7 +492,7 @@ func JoinNamespaceAndProcessInfoByPidsWithOptions(pids []string, descriptors []s
 	data := [][]string{}
 	for i, pid := range pidList {
 		pidData, err := JoinNamespaceAndProcessInfoWithOptions(pid, descriptors, options)
-		if errors.Is(err, os.ErrNotExist) {
+		if errors.Is(err, os.ErrNotExist) || errors.Is(err, unix.ESRCH) {
 			// catch race conditions
 			continue
 		}