1// +build darwin dragonfly freebsd netbsd openbsd
2
3package pty
4
5// from <sys/ioccom.h>
6const (
7	_IOC_VOID    uintptr = 0x20000000
8	_IOC_OUT     uintptr = 0x40000000
9	_IOC_IN      uintptr = 0x80000000
10	_IOC_IN_OUT  uintptr = _IOC_OUT | _IOC_IN
11	_IOC_DIRMASK         = _IOC_VOID | _IOC_OUT | _IOC_IN
12
13	_IOC_PARAM_SHIFT = 13
14	_IOC_PARAM_MASK  = (1 << _IOC_PARAM_SHIFT) - 1
15)
16
17func _IOC_PARM_LEN(ioctl uintptr) uintptr {
18	return (ioctl >> 16) & _IOC_PARAM_MASK
19}
20
21func _IOC(inout uintptr, group byte, ioctl_num uintptr, param_len uintptr) uintptr {
22	return inout | (param_len&_IOC_PARAM_MASK)<<16 | uintptr(group)<<8 | ioctl_num
23}
24
25func _IO(group byte, ioctl_num uintptr) uintptr {
26	return _IOC(_IOC_VOID, group, ioctl_num, 0)
27}
28
29func _IOR(group byte, ioctl_num uintptr, param_len uintptr) uintptr {
30	return _IOC(_IOC_OUT, group, ioctl_num, param_len)
31}
32
33func _IOW(group byte, ioctl_num uintptr, param_len uintptr) uintptr {
34	return _IOC(_IOC_IN, group, ioctl_num, param_len)
35}
36
37func _IOWR(group byte, ioctl_num uintptr, param_len uintptr) uintptr {
38	return _IOC(_IOC_IN_OUT, group, ioctl_num, param_len)
39}
40