// avoids a build dependency for other platforms.
var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno
var execveDarwin func(path *byte, argv **byte, envp **byte) error
var execveOpenBSD func(path *byte, argv **byte, envp **byte) error

// Exec invokes the execve(2) system call.
func Exec(argv0 string, argv []string, envv []string) (err error) {
	argv0p, err := BytePtrFromString(argv0)
	if err != nil {
		return err

	// In a statically linked binary, the stack contains argc,
	// argv as argc string pointers followed by a NULL, envv as a
	// sequence of string pointers followed by a NULL, and auxv.
	// The TLS pointer should be initialized to 0.
	//
	// In an ELFv2 compliant dynamically linked binary, R3 contains argc,
	// R4 contains argv, R5 contains envp, R6 contains auxv, and R13
	// contains the TLS pointer.
	//

			}
		}
	}
}

func Environ() []string {
	envp, e := GetEnvironmentStrings()
	if e != nil {
		return nil
	}
	defer FreeEnvironmentStrings(envp)

	r := make([]string, 0, 50) // Empty with room to grow.
	const size = unsafe.Sizeof(*envp)
	for *envp != 0 { // environment block ends with empty string
		// find NUL terminator
		end := unsafe.Pointer(envp)
		for *(*uint16)(end) != 0 {
			end = unsafe.Add(end, size)

func chdir(path uintptr) (err Errno)
func chroot1(path uintptr) (err Errno)
func closeFD(fd uintptr) (err Errno)
func dup2child(old uintptr, new uintptr) (val uintptr, err Errno)
func execve(path uintptr, argv uintptr, envp uintptr) (err Errno)
func exit(code uintptr)
func fcntl1(fd uintptr, cmd uintptr, arg uintptr) (val uintptr, err Errno)
func forkx(flags uintptr) (pid uintptr, err Errno)
func getpid() (pid uintptr, err Errno)

                public Process exec(String command, String[] envp) { return null; }
                public Process exec(String command, String[] envp, File file) { return null; }
                public Process exec(String command, List<?> envp, File file) { return null; }
                public Process exec(String[] command) { return null; }
                public Process exec(String[] command, String[] envp) { return null; }

{ "keys":[ {"e":"AQAB","kid":"DHFbpoIUqrY8t2zpA2qXfCmr5VO5ZEr4RzHU_-envvQ","kty":"RSA","n":"xAE7eB6qugXyCAG3yhh7pkDkT65pHymX-P7KfIupjf59vsdo91bSP9C8H07pSAGQO1MV_xFj9VswgsCg4R6otmg5PV2He95lZdHtOcU5DXIg_pbhLdKXbi66GlVeK6ABZOUW3WYtnNHD-91gVuoeJT_DwtGGcp4ignkgXfkiEm4sw-4sfb4qdt5oLbyVpmW6x9cfa7vs2WTfURiCrBoUqgBo_-4WTiULmmHSGZHOjzwa8WtrtOQGsAFjIbno85jp6MnGGGZPYZbDAa_b3y5u-YpW7ypZrvD8BgtKVjgtQgZhLAGezMt0ua3DRrWnKqTZ0BJ_EyxOGuHJrLsn00fnMQ"}]}...

        externalProcessStarted(command, consumer);
        return runtime.exec(command, envp);
    }

    public static Process exec(Runtime runtime, String[] command, String[] envp, String consumer) throws IOException {
        externalProcessStarted(command, consumer);
        return runtime.exec(command, envp);
    }

	// Write new environment variables.
	if envv != nil {
		for i = 0; i < len(envv); i++ {
			r1, _, _ = RawSyscall(SYS_CREATE, uintptr(unsafe.Pointer(envv[i].name)), uintptr(O_WRONLY), uintptr(0666))

			if int32(r1) == -1 {
				goto childerror
			}

			envfd = int(r1)

			r1, _, _ = RawSyscall6(SYS_PWRITE, uintptr(envfd), uintptr(unsafe.Pointer(envv[i].value)), uintptr(envv[i].nvalue),
				^uintptr(0), ^uintptr(0), 0)

func createEnvBlock(envv []string) ([]uint16, error) {
	if len(envv) == 0 {
		return utf16.Encode([]rune("\x00\x00")), nil
	}
	var length int
	for _, s := range envv {
		if bytealg.IndexByteString(s, 0) != -1 {
			return nil, EINVAL
		}
		length += len(s) + 1
	}
	length += 1

	b := make([]uint16, 0, length)
	for _, s := range envv {
		for _, c := range s {

TEXT _rt0_mipsle_linux(SB),NOSPLIT,$0
	JMP	_main<>(SB)

TEXT _main<>(SB),NOSPLIT|NOFRAME,$0
	// In a statically linked binary, the stack contains argc,
	// argv as argc string pointers followed by a NULL, envv as a
	// sequence of string pointers followed by a NULL, and auxv.
	// There is no TLS base pointer.
	MOVW	0(R29), R4 // argc
	ADD	$4, R29, R5 // argv
	JMP	main(SB)

TEXT main(SB),NOSPLIT|NOFRAME,$0