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 {

//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
	// Set up and fork. This returns immediately in the parent or
	// if there's an error.
	upid, pidfd, err, mapPipe, locked := forkAndExecInChild1(argv0, argv, envv, chroot, dir, attr, sys, pipe)
	if locked {
		runtime_AfterFork()
	}
	if err != 0 {

	SYS_READLINK             = 58  // { ssize_t|sys||readlink(const char *path, char *buf, size_t count); }
	SYS_EXECVE               = 59  // { int|sys||execve(const char *path, char * const *argp, char * const *envp); }
	SYS_UMASK                = 60  // { mode_t|sys||umask(mode_t newmask); }
	SYS_CHROOT               = 61  // { int|sys||chroot(const char *path); }
	SYS_VFORK                = 66  // { int|sys||vfork(void); }

	SYS_READLINK             = 58  // { ssize_t|sys||readlink(const char *path, char *buf, size_t count); }
	SYS_EXECVE               = 59  // { int|sys||execve(const char *path, char * const *argp, char * const *envp); }
	SYS_UMASK                = 60  // { mode_t|sys||umask(mode_t newmask); }
	SYS_CHROOT               = 61  // { int|sys||chroot(const char *path); }
	SYS_VFORK                = 66  // { int|sys||vfork(void); }

	SYS_READLINK             = 58  // { ssize_t|sys||readlink(const char *path, char *buf, size_t count); }
	SYS_EXECVE               = 59  // { int|sys||execve(const char *path, char * const *argp, char * const *envp); }
	SYS_UMASK                = 60  // { mode_t|sys||umask(mode_t newmask); }
	SYS_CHROOT               = 61  // { int|sys||chroot(const char *path); }
	SYS_VFORK                = 66  // { int|sys||vfork(void); }

	SYS_READLINK             = 58  // { ssize_t|sys||readlink(const char *path, char *buf, size_t count); }
	SYS_EXECVE               = 59  // { int|sys||execve(const char *path, char * const *argp, char * const *envp); }
	SYS_UMASK                = 60  // { mode_t|sys||umask(mode_t newmask); }
	SYS_CHROOT               = 61  // { int|sys||chroot(const char *path); }
	SYS_VFORK                = 66  // { int|sys||vfork(void); }

// executable name should also be the first argument in argv (["ls", "-l"]).
// envv are the environment variables that should be passed to the new
// process (["USER=go", "PWD=/tmp"]).
func Exec(argv0 string, argv []string, envv []string) error {
	return syscall.Exec(argv0, argv, envv)
}

// Lutimes sets the access and modification times tv on path. If path refers to

	SYS_READLINK                 = 58  // { ssize_t readlink(char *path, char *buf, size_t count); }
	SYS_EXECVE                   = 59  // { int execve(char *fname, char **argv, char **envv); }
	SYS_UMASK                    = 60  // { int umask(int newmask); }
	SYS_CHROOT                   = 61  // { int chroot(char *path); }
	SYS_MSYNC                    = 65  // { int msync(void *addr, size_t len, int flags); }