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"},

	},
	{
		Name:   "bar",
		Data:   nil, // large data set in the test
		Method: Deflate,
		Mode:   0644,
	},
	{
		Name:   "setuid",
		Data:   []byte("setuid file"),
		Method: Deflate,
		Mode:   0755 | fs.ModeSetuid,
	},
	{
		Name:   "setgid",
		Data:   []byte("setgid file"),
		Method: Deflate,
		Mode:   0755 | fs.ModeSetgid,
	},
	{
		Name:   "symlink",
		Data:   []byte("../link/target"),

	// Set file permission bits.
	mode = fs.FileMode(fi.h.Mode).Perm()

	// Set setuid, setgid and sticky bits.
	if fi.h.Mode&c_ISUID != 0 {
		mode |= fs.ModeSetuid
	}
	if fi.h.Mode&c_ISGID != 0 {
		mode |= fs.ModeSetgid
	}
	if fi.h.Mode&c_ISVTX != 0 {
		mode |= fs.ModeSticky
	}

	// Set file mode bits; clear perm, setuid, setgid, and sticky bits.
	switch m := fs.FileMode(fi.h.Mode) &^ 07777; m {
	case c_ISDIR:

pkg syscall (netbsd-arm64-cgo), const SYS_SETEGID = 182
pkg syscall (netbsd-arm64-cgo), const SYS_SETEGID ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SETEUID = 183
pkg syscall (netbsd-arm64-cgo), const SYS_SETEUID ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SETGID = 181
pkg syscall (netbsd-arm64-cgo), const SYS_SETGID ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SETGROUPS = 80

			unlink(path, callback) { callback(enosys()); },
			utimes(path, atime, mtime, callback) { callback(enosys()); },
		};
	}

	if (!globalThis.process) {
		globalThis.process = {
			getuid() { return -1; },
			getgid() { return -1; },
			geteuid() { return -1; },
			getegid() { return -1; },
			getgroups() { throw enosys(); },
			pid: -1,
			ppid: -1,
			umask() { throw enosys(); },
			cwd() { throw enosys(); },

pkg syscall (darwin-arm64), const SYS_SETAUID = 354
pkg syscall (darwin-arm64), const SYS_SETAUID ideal-int
pkg syscall (darwin-arm64), const SYS_SETEGID = 182
pkg syscall (darwin-arm64), const SYS_SETEGID ideal-int
pkg syscall (darwin-arm64), const SYS_SETEUID = 183
pkg syscall (darwin-arm64), const SYS_SETEUID ideal-int
pkg syscall (darwin-arm64), const SYS_SETGID = 181

pkg syscall (darwin-386), const SYS_SETAUID ideal-int
pkg syscall (darwin-386), const SYS_SETEGID ideal-int
pkg syscall (darwin-386), const SYS_SETEUID ideal-int
pkg syscall (darwin-386), const SYS_SETGID ideal-int
pkg syscall (darwin-386), const SYS_SETGROUPS ideal-int
pkg syscall (darwin-386), const SYS_SETITIMER ideal-int
pkg syscall (darwin-386), const SYS_SETLCID ideal-int

pkg syscall (freebsd-arm64), const SYS_SETAUID = 448
pkg syscall (freebsd-arm64), const SYS_SETAUID ideal-int
pkg syscall (freebsd-arm64), const SYS_SETCONTEXT = 422
pkg syscall (freebsd-arm64), const SYS_SETCONTEXT ideal-int
pkg syscall (freebsd-arm64), const SYS_SETEGID = 182
pkg syscall (freebsd-arm64), const SYS_SETEGID ideal-int
pkg syscall (freebsd-arm64), const SYS_SETEUID = 183

			Typeflag: TypeFifo,
		},
		fm: 0600 | fs.ModeNamedPipe,
	}, {
		// setuid.
		h: &Header{
			Name:     "bin/su",
			Mode:     0755 | c_ISUID,
			Size:     23232,
			ModTime:  time.Unix(1355405093, 0),
			Typeflag: TypeReg,
		},
		fm: 0755 | fs.ModeSetuid,
	}, {
		// setguid.
		h: &Header{
			Name:     "group.txt",
			Mode:     0750 | c_ISGID,
			Size:     0,

pkg syscall (freebsd-riscv64-cgo), const SYS_SETEUID ideal-int #53466
pkg syscall (freebsd-riscv64-cgo), const SYS_SETFIB = 175 #53466
pkg syscall (freebsd-riscv64-cgo), const SYS_SETFIB ideal-int #53466
pkg syscall (freebsd-riscv64-cgo), const SYS_SETGID = 181 #53466
pkg syscall (freebsd-riscv64-cgo), const SYS_SETGID ideal-int #53466
pkg syscall (freebsd-riscv64-cgo), const SYS_SETGROUPS = 80 #53466