prog: speed up opening pinned Programs

With commit df9ebe8 the opening of programs by fd was improved. The
LoadPinnedProgram still uses to full ProgramInfo instead of the
sufficient minimal one.

This commit improves the load of pinned Programs as well by using the
central helper for creating programs from a fd. This also makes it more
consistent with the LoadPinnedMap function as well.

Signed-off-by: Tobias Böhm <[email protected]>

Author: aibor

prog.go

@@ -978,20 +978,16 @@ func LoadPinnedProgram(fileName string, opts *LoadPinOptions) (*Program, error)
 		return nil, fmt.Errorf("%s is not a Program", fileName)
 	}
 
-	info, err := newProgramInfoFromFd(fd)
-	if err != nil {
-		_ = fd.Close()
-		return nil, fmt.Errorf("info for %s: %w", fileName, err)
-	}
+	p, err := newProgramFromFD(fd)
+	if err == nil {
+		p.pinnedPath = fileName
 
-	var progName string
-	if haveObjName() == nil {
-		progName = info.Name
-	} else {
-		progName = filepath.Base(fileName)
+		if haveObjName() != nil {
+			p.name = filepath.Base(fileName)
+		}
 	}
 
-	return &Program{"", fd, progName, fileName, info.Type}, nil
+	return p, err
 }
 
 // ProgramGetNextID returns the ID of the next eBPF program.