// Absorb flag constants into SETxx ops.
((SETEQ|SETLE|SETGE|SETBE|SETAE) (FlagEQ))     => (MOVLconst [1])
((SETNE|SETL|SETG|SETB|SETA)     (FlagEQ))     => (MOVLconst [0])
((SETNE|SETL|SETLE|SETB|SETBE)   (FlagLT_ULT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETA|SETAE)   (FlagLT_ULT)) => (MOVLconst [0])
((SETNE|SETL|SETLE|SETA|SETAE)   (FlagLT_UGT)) => (MOVLconst [1])

		offset += int(buf[2])
	}

	*t = Time{}
	t.wall = uint64(nsec)
	t.ext = sec

	if offset == -1*60 {
		t.setLoc(&utcLoc)
	} else if _, localoff, _, _, _ := Local.lookup(t.unixSec()); offset == localoff {
		t.setLoc(Local)
	} else {
		t.setLoc(FixedZone("", offset))
	}

	return nil
}

// TODO(rsc): Remove GobEncoder, GobDecoder, MarshalJSON, UnmarshalJSON in Go 2.

	if idx == -1 {
		tty = s
	} else {
		tty = s[:idx]
	}
	return
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = int32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = int32(length)
}

//sys   fcntl(fd int, cmd int, arg int) (val int, err error)

		name, offset, _, _, _ := local.lookup(t.unixSec())
		if offset == zoneOffset && (zoneName == "" || name == zoneName) {
			t.setLoc(local)
			return t, nil
		}

		// Otherwise create fake zone to record offset.
		zoneNameCopy := stringslite.Clone(zoneName) // avoid leaking the input value
		t.setLoc(FixedZone(zoneNameCopy, zoneOffset))
		return t, nil
	}

	if zoneName != "" {

	var iov Iovec
	iov.Base = (*byte)(unsafe.Pointer(regsout))
	iov.SetLen(int(unsafe.Sizeof(*regsout)))
	return ptracePtr(PTRACE_GETREGSET, pid, uintptr(elfNT_PRSTATUS), unsafe.Pointer(&iov))
}

func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
	var iov Iovec
	iov.Base = (*byte)(unsafe.Pointer(regs))
	iov.SetLen(int(unsafe.Sizeof(*regs)))

	F_RDLCK                           = 0x1
	F_SETBACKINGSTORE                 = 0x46
	F_SETFD                           = 0x2
	F_SETFL                           = 0x4
	F_SETLK                           = 0x8
	F_SETLKW                          = 0x9
	F_SETLKWTIMEOUT                   = 0xa
	F_SETNOSIGPIPE                    = 0x49
	F_SETOWN                          = 0x6
	F_SETPROTECTIONCLASS              = 0x40

	F_READBOOTSTRAP                   = 0x2e
	F_SETBACKINGSTORE                 = 0x46
	F_SETFD                           = 0x2
	F_SETFL                           = 0x4
	F_SETLK                           = 0x8
	F_SETLKW                          = 0x9
	F_SETNOSIGPIPE                    = 0x49
	F_SETOWN                          = 0x6
	F_SETPROTECTIONCLASS              = 0x40
	F_SETSIZE                         = 0x2b

	F_SETFD                       = 0x2
	F_SETFL                       = 0x4
	F_SETLK                       = 0x6
	F_SETLK64                     = 0x6
	F_SETLK64_NBMAND              = 0x2a
	F_SETLKW                      = 0x7
	F_SETLKW64                    = 0x7
	F_SETLK_NBMAND                = 0x2a
	F_SETOWN                      = 0x18
	F_SHARE                       = 0x28
	F_SHARE_NBMAND                = 0x2b

	F_SETFD                          = 0x2
	F_SETFL                          = 0x4
	F_SETLEASE                       = 0x400
	F_SETLK                          = 0x6
	F_SETLK64                        = 0x6
	F_SETLKW                         = 0x7
	F_SETLKW64                       = 0x7
	F_SETOWN                         = 0x8
	F_SETOWN_EX                      = 0xf
	F_SETPIPE_SZ                     = 0x407

	F_GETOWN                          = 0x5
	F_RDLCK                           = 0x1
	F_SETFD                           = 0x2
	F_SETFL                           = 0x4
	F_SETLK                           = 0x8
	F_SETLKW                          = 0x9
	F_SETOWN                          = 0x6
	F_UNLCK                           = 0x2
	F_WRLCK                           = 0x3
	HUPCL                             = 0x4000