Revert procArgs to use C.sysctl instead of unix.SysctlRaw

Done this in the hope of fixing a bug happening on CI but not on my system.

process/process_darwin_cgo.go

@@ -22,7 +22,6 @@ import (
 	"unsafe"
 
 	"github.com/shirou/gopsutil/v3/cpu"
-	"golang.org/x/sys/unix"
 )
 
 var (
@@ -100,14 +99,21 @@ func (p *Process) CwdWithContext(ctx context.Context) (string, error) {
 }
 
 func procArgs(pid int32) ([]byte, int, error) {
-	var nargs C.int
-
-	buffer, err := unix.SysctlRaw("kern.procargs2", int(pid))
-	if err == nil && len(buffer) > 0 {
-		C.memcpy(unsafe.Pointer(&nargs), unsafe.Pointer(&buffer[0]), C.sizeof_int)
-		return buffer, int(nargs), nil
+	var (
+		mib             = [...]C.int{C.CTL_KERN, C.KERN_PROCARGS2, C.int(pid)}
+		size   C.size_t = C.ulong(argMax)
+		nargs  C.int
+		result []byte
+	)
+	procargs := (*C.char)(C.malloc(C.ulong(argMax)))
+	defer C.free(unsafe.Pointer(procargs))
+	retval, err := C.sysctl(&mib[0], 3, unsafe.Pointer(procargs), &size, C.NULL, 0)
+	if retval == 0 {
+		C.memcpy(unsafe.Pointer(&nargs), unsafe.Pointer(procargs), C.sizeof_int)
+		result = C.GoBytes(unsafe.Pointer(procargs), C.int(size))
+		// fmt.Printf("size: %d %d\n%s\n", size, nargs, hex.Dump(result))
+		return result, int(nargs), nil
 	}
-
 	return nil, 0, err
 }