diff --git a/src/os/exec_linux_test.go b/src/os/exec_linux_test.go
index 6b660dadf6..42fb837ba8 100644
--- a/src/os/exec_linux_test.go
+++ b/src/os/exec_linux_test.go
@@ -18,7 +18,7 @@ func TestForkExec(t *testing.T) {
 		return
 	}
 
-	proc, err := StartProcess("echo", []string{"/bin/echo", "hello", "world"}, &ProcAttr{})
+	proc, err := StartProcess("/bin/echo", []string{"hello", "world"}, &ProcAttr{})
 	if !errors.Is(err, nil) {
 		t.Fatalf("forkExec failed: %v", err)
 	}
@@ -28,12 +28,15 @@ func TestForkExec(t *testing.T) {
 	}
 	t.Logf("forkExec succeeded: new process has pid %d", proc)
 
-	proc, err = StartProcess("invalid", []string{"/bin/nonexistent"}, &ProcAttr{})
-	if errors.Is(err, nil) {
-		t.Fatalf("wanted err, got nil")
+}
+
+func TestForkExecInvalid(t *testing.T) {
+	proc, err := StartProcess("invalid", []string{"invalid"}, &ProcAttr{})
+	if !errors.Is(err, ErrNotExist) {
+		t.Fatalf("wanted ErrNotExist, got %s\n", err)
 	}
 
-	if proc.Pid != 0 {
-		t.Fatalf("wanted 0, got %v", proc.Pid)
+	if proc != nil {
+		t.Fatalf("wanted nil, got %v\n", proc)
 	}
 }
diff --git a/src/os/os.test b/src/os/os.test
new file mode 100755
index 0000000000..345ca96da3
Binary files /dev/null and b/src/os/os.test differ
diff --git a/src/os/osexec.go b/src/os/osexec.go
index cf280fe887..8d4c2d55ea 100644
--- a/src/os/osexec.go
+++ b/src/os/osexec.go
@@ -40,8 +40,6 @@ func execve(pathname string, argv []string, envv []string) error {
 
 	ret, _, err := syscall.Syscall(syscall.SYS_EXECVE, uintptr(unsafe.Pointer(&argv0[0])), uintptr(unsafe.Pointer(&argv1[0])), uintptr(unsafe.Pointer(&env1[0])))
 	if int(ret) != 0 {
-		// errno := err.(syscall.Errno)
-		// return errno
 		return err
 	}
 
diff --git a/src/os/signal/signal.go b/src/os/signal/signal.go
deleted file mode 100644
index 814d42173b..0000000000
--- a/src/os/signal/signal.go
+++ /dev/null
@@ -1,16 +0,0 @@
-//go:build !baremetal
-
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package signal
-
-import (
-	"os"
-)
-
-// Just stubbing the functions for now since signal handling is not yet implemented in tinygo
-func Reset(sig ...os.Signal)                      {}
-func Ignore(sig ...os.Signal)                     {}
-func Notify(c chan<- os.Signal, sig ...os.Signal) {}
diff --git a/src/syscall/exec_unix.go b/src/syscall/exec_unix.go
deleted file mode 100644
index 2d92d5061e..0000000000
--- a/src/syscall/exec_unix.go
+++ /dev/null
@@ -1,7 +0,0 @@
-//go:build unix
-
-package syscall
-
-// Implemented in runtime package.
-func runtime_BeforeExec()
-func runtime_AfterExec()