os: implement StartProcess

Signed-off-by: leongross <leon.gross@9elements.com>

src/os/exec_linux_test.go

@@ -0,0 +1,78 @@
+//go:build linux && !baremetal && !tinygo.wasm
+
+package os_test
+
+import (
+	"errors"
+	. "os"
+	"runtime"
+	"syscall"
+	"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("/bin/echo", []string{"hello", "world"}, &ProcAttr{})
+	if !errors.Is(err, nil) {
+		t.Fatalf("forkExec failed: %v", err)
+	}
+
+	if proc == nil {
+		t.Fatalf("proc is nil")
+	}
+
+	if proc.Pid == 0 {
+		t.Fatalf("forkExec failed: new process has pid 0")
+	}
+}
+
+func TestForkExecErrNotExist(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 != nil {
+		t.Fatalf("wanted nil, got %v\n", proc)
+	}
+}
+
+func TestForkExecProcDir(t *testing.T) {
+	proc, err := StartProcess("/bin/echo", []string{"hello", "world"}, &ProcAttr{Dir: "dir"})
+	if !errors.Is(err, ErrNotImplementedDir) {
+		t.Fatalf("wanted ErrNotImplementedDir, got %v\n", err)
+	}
+
+	if proc != nil {
+		t.Fatalf("wanted nil, got %v\n", proc)
+	}
+}
+
+func TestForkExecProcSys(t *testing.T) {
+	proc, err := StartProcess("/bin/echo", []string{"hello", "world"}, &ProcAttr{Sys: &syscall.SysProcAttr{}})
+	if !errors.Is(err, ErrNotImplementedSys) {
+		t.Fatalf("wanted ErrNotImplementedSys, got %v\n", err)
+	}
+
+	if proc != nil {
+		t.Fatalf("wanted nil, got %v\n", proc)
+	}
+}
+
+func TestForkExecProcFiles(t *testing.T) {
+	proc, err := StartProcess("/bin/echo", []string{"hello", "world"}, &ProcAttr{Files: []*File{}})
+	if !errors.Is(err, ErrNotImplementedFiles) {
+		t.Fatalf("wanted ErrNotImplementedFiles, got %v\n", err)
+	}
+
+	if proc != nil {
+		t.Fatalf("wanted nil, got %v\n", proc)
+	}
+}