//sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT
//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sysnb	Getegid() (egid int)
//sysnb	Geteuid() (euid int)
//sysnb	Getgid() (gid int)
//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_GETRLIMIT
//sysnb	Getuid() (uid int)
//sysnb	InotifyInit() (fd int, err error)

		return scratch
	}
	return int64(r0)
}

func Gettimeofday(tv *Timeval) error {
	nsec := nsec()
	*tv = NsecToTimeval(nsec)
	return nil
}

func Getegid() (egid int) { return -1 }
func Geteuid() (euid int) { return -1 }
func Getgid() (gid int)   { return -1 }
func Getuid() (uid int)   { return -1 }

func Getgroups() (gids []int, err error) {
	return make([]int, 0), nil
}

		fn             func() error
		filter, expect string
	}{
		{call: "Setegid(1)", fn: func() error { return syscall.Setegid(1) }, filter: "Gid:", expect: "\t0\t1\t0\t1"},
		{call: "Setegid(0)", fn: func() error { return syscall.Setegid(0) }, filter: "Gid:", expect: "\t0\t0\t0\t0"},

		{call: "Seteuid(1)", fn: func() error { return syscall.Seteuid(1) }, filter: "Uid:", expect: "\t0\t1\t0\t1"},

  } else                           \
    x->retval = ret

void
_cgo_libc_setegid(argset_t* x) {
	SET_RETVAL(setegid((gid_t) x->args[0]));
}

void
_cgo_libc_seteuid(argset_t* x) {
	SET_RETVAL(seteuid((uid_t) x->args[0]));
}

void
_cgo_libc_setgid(argset_t* x) {
	SET_RETVAL(setgid((gid_t) x->args[0]));
}

void
_cgo_libc_setgroups(argset_t* x) {

)

type SysProcAttr struct {
	Chroot     string      // Chroot.
	Credential *Credential // Credential.
	Setsid     bool        // Create session.
	// Setpgid sets the process group ID of the child to Pgid,
	// or, if Pgid == 0, to the new child's process ID.
	Setpgid bool
	// Setctty sets the controlling terminal of the child to
	// file descriptor Ctty. Ctty must be a descriptor number

//go:cgo_import_dynamic libc_ioctl ioctl "libc.so"
//go:cgo_import_dynamic libc_setgid setgid "libc.so"
//go:cgo_import_dynamic libc_setgroups setgroups "libc.so"
//go:cgo_import_dynamic libc_setrlimit setrlimit "libc.so"
//go:cgo_import_dynamic libc_setsid setsid "libc.so"
//go:cgo_import_dynamic libc_setuid setuid "libc.so"
//go:cgo_import_dynamic libc_setpgid setpgid "libc.so"
//go:cgo_import_dynamic libc_syscall syscall "libc.so"

	JMP	runtime·syscall_rawsyscall6(SB)

TEXT ·setgid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setgid(SB)

TEXT ·setgroups1(SB),NOSPLIT,$0
	JMP	runtime·syscall_setgroups(SB)

TEXT ·setrlimit1(SB),NOSPLIT,$0
	JMP	runtime·syscall_setrlimit(SB)

TEXT ·setsid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setsid(SB)

TEXT ·setuid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setuid(SB)

TEXT ·setpgid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setpgid(SB)

//go:cgo_import_dynamic libc_setgid setgid "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setgroups setgroups "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setrlimit setrlimit "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setsid setsid "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setuid setuid "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setpgid setpgid "libc.a/shr_64.o"

//go:linkname libc_chdir libc_chdir

	// BSD mkdir(2) inherits the parent directory group, and other platforms
	// can inherit the parent directory group via setgid. The test setup (chmod
	// setgid) will fail if the process does not have the group permission to
	// the new temporary directory.
	err = os.Chown(setgiddir, os.Getuid(), os.Getgid())
	if err != nil {
		if testenv.SyscallIsNotSupported(err) {
			t.Skip("skipping: chown is not supported on " + runtime.GOOS)

	"testing"
	"time"
)

type command struct {
	pipe io.WriteCloser
	proc *exec.Cmd
	test *testing.T
}

func (c *command) Info() (pid, pgrp int) {
	pid = c.proc.Process.Pid

	pgrp, err := syscall.Getpgid(pid)
	if err != nil {
		c.test.Fatal(err)
	}

	return
}

func (c *command) Start() {
	if err := c.proc.Start(); err != nil {
		c.test.Fatal(err)
	}
}

func (c *command) Stop() {