r = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error) {
	_, e1 := callfcntl(fd, cmd, uintptr(unsafe.Pointer(lk)))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

	var err error
	if errno != 0 {
		err = errno
	}
	return int(valptr), err
}

// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procfcntl)), 3, uintptr(fd), uintptr(cmd), uintptr(unsafe.Pointer(lk)), 0, 0, 0)
	if e1 != 0 {
		return e1
	}
	return nil
}

		{"FindNextFile", Func, 0},
		{"Flock", Func, 0},
		{"Flock_t", Type, 0},
		{"Flock_t.Len", Field, 0},
		{"Flock_t.Pad_cgo_0", Field, 0},
		{"Flock_t.Pad_cgo_1", Field, 3},
		{"Flock_t.Pid", Field, 0},
		{"Flock_t.Start", Field, 0},
		{"Flock_t.Sysid", Field, 0},
		{"Flock_t.Type", Field, 0},
		{"Flock_t.Whence", Field, 0},
		{"FlushBpf", Func, 0},
		{"FlushFileBuffers", Func, 0},

	if int64(p) == -1 {
		return pos, errnoErr2(e1, e2)
	}
	return pos, nil
}

// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
	// struct flock is packed on z/OS. We can't emulate that in Go so
	// instead we pack it here.
	var flock [24]byte
	*(*int16)(unsafe.Pointer(&flock[0])) = lk.Type

	r = int(r0)
	if r0 == -1 && er != nil {
		err = er
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error) {
	r0, er := C.fcntl(C.uintptr_t(fd), C.int(cmd), C.uintptr_t(uintptr(unsafe.Pointer(lk))))
	if r0 == -1 && er != nil {
		err = er
	}
	return
}

pkg syscall (freebsd-386), type Flock_t struct
pkg syscall (freebsd-386), type Flock_t struct, Len int64
pkg syscall (freebsd-386), type Flock_t struct, Pid int32
pkg syscall (freebsd-386), type Flock_t struct, Start int64
pkg syscall (freebsd-386), type Flock_t struct, Sysid int32
pkg syscall (freebsd-386), type Flock_t struct, Type int16
pkg syscall (freebsd-386), type Flock_t struct, Whence int16

                @Inject
                abstract FileLockManager getFileLockManager()

                @Inject
                abstract ProjectLayout getProjectLayout()

                @TaskAction
                void lockIt() {
                    def lock
                    try {

		$2 ~ /^C(LOCAL|READ)$/ ||
		$2 == "BRKINT" ||
		$2 == "HUPCL" ||
		$2 == "PENDIN" ||
		$2 == "TOSTOP" ||
		$2 ~ /^PAR/ ||
		$2 ~ /^SIG[^_]/ ||
		$2 ~ /^O[CNPFP][A-Z]+[^_][A-Z]+$/ ||
		$2 ~ /^IN_/ ||
		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
		$2 == "ICMPV6_FILTER" ||
		$2 == "SOMAXCONN" ||
		$2 == "NAME_MAX" ||

		t.Fatal("subprocess failed; output:\n", string(buf))
	}

	// The child blockers print "x\n" and then block on a lock. Receiving
	// those bytes only indicates that the child is _about to block_. Since
	// we don't have a way to know when it is fully blocked, sleep a bit to
	// make us less likely to lose the race and signal before the child
	// blocks.
	time.Sleep(100 * time.Millisecond)

	// Send SIGQUIT.

This causes builds to break without any obvious change, and worse, can be caused by a transitive dependency that the build author has no control over.

To achieve https://reproducible-builds.org/[reproducible builds], it is necessary to _lock_ versions of dependencies and transitive dependencies such that a build with the same inputs will always resolve the same module versions.
This is called _dependency locking_.

It enables, amongst others, the following scenarios: