{call: "Setgroups([]int{0,1,2,3})", fn: func() error { return syscall.Setgroups([]int{0, 1, 2, 3}) }, filter: "Groups:", expect: "\t0 1 2 3"},
		{call: "Setgroups(nil)", fn: func() error { return syscall.Setgroups(nil) }, filter: "Groups:", expect: ""},
		{call: "Setgroups([]int{0})", fn: func() error { return syscall.Setgroups([]int{0}) }, filter: "Groups:", expect: "\t0"},

<pre class="grammar">
Production  = production_name "=" [ Expression ] "." .
Expression  = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term        = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .
</pre>

<p>
Productions are expressions constructed from terms and the following

	Size  int64  // Logical file size in bytes
	Mode  int64  // Permission and mode bits
	Uid   int    // User ID of owner
	Gid   int    // Group ID of owner
	Uname string // User name of owner
	Gname string // Group name of owner

	// If the Format is unspecified, then Writer.WriteHeader rounds ModTime
	// to the nearest second and ignores the AccessTime and ChangeTime fields.
	//

including <a href="/pkg/sync/#Cond">condition variables</a>,
<a href="/pkg/sync/#Map">lock-free maps</a>,
<a href="/pkg/sync/#Pool">allocation pools</a>,
and
<a href="/pkg/sync/#WaitGroup">wait groups</a>.
The documentation for each of these specifies the guarantees it
makes concerning synchronization.
</p>

<p>
Other packages that provide synchronization abstractions

Syntax      = { Production } .
Production  = production_name "=" [ Expression ] "." .
Expression  = Term { "|" Term } .
Term        = Factor { Factor } .
Factor      = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .
</pre>

<p>
Productions are expressions constructed from terms and the following

	for i := 1; i <= len(exitStr); i++ {
		fmt.Fprintf(&exitReStr, "%s$|", exitStr[:i])
	}
	// Finally, match the exit string along with an exit code.
	// This is the only case we use a group, and we'll use this
	// group to extract the numeric code.
	fmt.Fprintf(&exitReStr, "%s([0-9]+)$", exitStr)
	exitRe := regexp.MustCompile(exitReStr.String())

	return &exitCodeFilter{w: w, exitRe: exitRe}, exitStr
}

			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,
			ModTime:  time.Unix(1360602346, 0),
			Typeflag: TypeReg,
		},
		fm: 0750 | fs.ModeSetgid,
	}, {
		// sticky.
		h: &Header{

	if err != nil {
		t.Fatal(err)
	}
	if hdr.Name != chineseFilename {
		t.Fatal("Couldn't recover unicode name")
	}
	if hdr.Gname != chineseGroupname {
		t.Fatal("Couldn't recover unicode group")
	}
	if hdr.Uname != chineseUsername {
		t.Fatal("Couldn't recover unicode user")
	}
}

func TestPaxXattrs(t *testing.T) {
	xattrs := map[string]string{
		"user.key": "value",
	}

pkg debug/elf, const DF_1_GLOBAL DynFlag1 #56887
pkg debug/elf, const DF_1_GLOBAUDIT = 16777216 #56887
pkg debug/elf, const DF_1_GLOBAUDIT DynFlag1 #56887
pkg debug/elf, const DF_1_GROUP = 4 #56887
pkg debug/elf, const DF_1_GROUP DynFlag1 #56887
pkg debug/elf, const DF_1_IGNMULDEF = 262144 #56887
pkg debug/elf, const DF_1_IGNMULDEF DynFlag1 #56887
pkg debug/elf, const DF_1_INITFIRST = 32 #56887