add TestForExec

Signed-off-by: leongross <[email protected]>

Author: leongross

src/os/exec_posix.go

@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build aix || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris || wasip1 || windows
+//go:build aix || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris || wasip1
 
 package os
 
 import (
+	"errors"
 	"runtime"
 	"syscall"
 	"unsafe"
@@ -49,6 +50,14 @@ func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error)
 		ret uintptr
 	)
 
+	if len(argv) == 0 {
+		return 0, errors.New("exec: no argv")
+	}
+
+	if attr == nil {
+		attr = new(ProcAttr)
+	}
+
 	argv0p, err := syscall.BytePtrFromString(argv0)
 	if err != nil {
 		return 0, err

src/os/exec_posix_test.go

@@ -0,0 +1,29 @@
+package os_test
+
+import (
+	. "os"
+	"runtime"
+	"testing"
+)
+
+// Test the functionality of the forkExec function, which is used to fork and exec a new process.
+// This test is not run on Windows, as forkExec is not supported on Windows.
+// This test is not run on Plan 9, as forkExec is not supported on Plan 9.
+func TestForkExec(t *testing.T) {
+	if runtime.GOOS != "linux" {
+		t.Logf("skipping test on %s", runtime.GOOS)
+		return
+	}
+
+	proc, err := StartProcess("echo", []string{"echo", "hello", "world"}, &ProcAttr{})
+	if err != nil {
+		t.Fatalf("forkExec failed: %v", err)
+		return
+	}
+
+	if proc.Pid == 0 {
+		t.Fatalf("forkExec failed: new process has pid 0")
+	} else {
+		t.Logf("forkExec succeeded: new process has pid %d", proc)
+	}
+}