if sys.Jail > 0 {
		_, _, err1 = RawSyscall(SYS_JAIL_ATTACH, uintptr(sys.Jail), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

	// Enable tracing if requested.
	if sys.Ptrace {
		_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

	// Session ID
	if sys.Setsid {
		_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
		if err1 != 0 {

				_, _, err1 = RawSyscall(_SYS_DUP3, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
			} else if runtime.GOOS == "dragonfly" {
				_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
			} else {
				_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(nextfd), 0)
				if err1 != 0 {
					goto childerror
				}
				_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)

		}
		if !cred.NoSetGroups {
			_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgroups_trampoline), ngroups, groups, 0)
			if err1 != 0 {
				goto childerror
			}
		}
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgid_trampoline), uintptr(cred.Gid), 0, 0)
		if err1 != 0 {
			goto childerror
		}
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setuid_trampoline), uintptr(cred.Uid), 0, 0)
		if err1 != 0 {

TEXT	·Syscall6(SB),NOSPLIT,$0-80
	JMP	·syscall6Internal(SB)

// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT	·RawSyscall(SB),NOSPLIT,$0-56
	JMP	·rawSyscallInternal(SB)

// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
	JMP	·rawSyscall6Internal(SB)

	return syscall.Syscall6(trap, a1, a2, a3, a4, a5, a6)
}
func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) {
	return syscall.RawSyscall(trap, a1, a2, a3)
}
func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno) {
	return syscall.RawSyscall6(trap, a1, a2, a3, a4, a5, a6)

TEXT	·Syscall6(SB),NOSPLIT,$0-80
	JMP	·syscall6Internal(SB)

// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT	·RawSyscall(SB),NOSPLIT,$0-56
	JMP	·rawSyscallInternal(SB)

// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
	JMP	·rawSyscall6Internal(SB)

	JMP	syscall·Syscall(SB)

TEXT	·Syscall6(SB),NOSPLIT,$0-40
	JMP	syscall·Syscall6(SB)

TEXT	·Syscall9(SB),NOSPLIT,$0-52
	JMP	syscall·Syscall9(SB)

TEXT	·RawSyscall(SB),NOSPLIT,$0-28
	JMP	syscall·RawSyscall(SB)

TEXT	·RawSyscall6(SB),NOSPLIT,$0-40

	RET
ok9:
	ADDQ	$32, SP
	MOVQ	AX, r1+80(FP)
	MOVQ	DX, r2+88(FP)
	MOVQ	$0, err+96(FP)
	CALL	runtime·exitsyscall<ABIInternal>(SB)
	RET

// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	trap+0(FP), AX	// syscall entry
	ADDQ	$0x2000000, AX
	SYSCALL
	JCC	ok1

	RET
ok:
	MOVD	R0, r1+32(FP) // r1
	MOVD	R1, r2+40(FP)	// r2
	MOVD	ZR, err+48(FP)	// err
	BL	runtime·exitsyscall<ABIInternal>(SB)
	RET

// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
	MOVD	trap+0(FP), R16	// syscall entry
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	SVC	$0x80
	BCC	ok
	MOVD	$-1, R1

//

//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)

#define SYS_ERRSTR 41	/* from zsysnum_plan9.go */

TEXT	·Syscall(SB),NOSPLIT,$168-64
	NO_LOCAL_POINTERS