can gather file path from proc fs if unknown

1 files changed, 13 insertions, 0 deletions

diff --git a/internal/file.go b/internal/file.go
index 9230afd..efb570b 100644
--- a/internal/file.go
+++ b/internal/file.go
@@ -1,6 +1,8 @@
 package internal
 
 import (
+	"fmt"
+	"os"
 	"strconv"
 	"strings"
 )
@@ -14,6 +16,17 @@ type fdFile struct {
 	name string
 }
 
+func newFdFile(fd int32, name string) fdFile {
+	return fdFile{fd, name}
+}
+
+func newFdFileWithPid(fd int32, pid uint32) fdFile {
+	if linkName, err := os.Readlink(fmt.Sprintf("/proc/%d/fd/%d", pid, fd)); err == nil {
+		return fdFile{fd, linkName}
+	}
+	return fdFile{fd, "?"}
+}
+
 func (f fdFile) String() string {
 	var sb strings.Builder