71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package ioctl
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import "syscall"
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// Generic ioctl constants
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const (
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IOC_NONE = 0x0
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IOC_WRITE = 0x1
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IOC_READ = 0x2
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IOC_NRBITS = 8
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IOC_TYPEBITS = 8
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IOC_SIZEBITS = 14
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IOC_DIRBITS = 2
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IOC_NRSHIFT = 0
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IOC_TYPESHIFT = IOC_NRSHIFT + IOC_NRBITS
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IOC_SIZESHIFT = IOC_TYPESHIFT + IOC_TYPEBITS
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IOC_DIRSHIFT = IOC_SIZESHIFT + IOC_SIZEBITS
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IOC_NRMASK = ((1 << IOC_NRBITS) - 1)
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IOC_TYPEMASK = ((1 << IOC_TYPEBITS) - 1)
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IOC_SIZEMASK = ((1 << IOC_SIZEBITS) - 1)
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IOC_DIRMASK = ((1 << IOC_DIRBITS) - 1)
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)
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// Some useful additional ioctl constanst
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const (
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IOC_IN = IOC_WRITE << IOC_DIRSHIFT
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IOC_OUT = IOC_READ << IOC_DIRSHIFT
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IOC_INOUT = (IOC_WRITE | IOC_READ) << IOC_DIRSHIFT
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IOCSIZE_MASK = IOC_SIZEMASK << IOC_SIZESHIFT
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IOCSIZE_SHIFT = IOC_SIZESHIFT
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)
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// IOC generate IOC
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func IOC(dir, t, nr, size uintptr) uintptr {
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return (dir << IOC_DIRSHIFT) | (t << IOC_TYPESHIFT) |
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(nr << IOC_NRSHIFT) | (size << IOC_SIZESHIFT)
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}
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// IOR generate IOR
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func IOR(t, nr, size uintptr) uintptr {
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return IOC(IOC_READ, t, nr, size)
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}
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// IOW generate IOW
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func IOW(t, nr, size uintptr) uintptr {
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return IOC(IOC_WRITE, t, nr, size)
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}
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// IOWR generate IOWR
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func IOWR(t, nr, size uintptr) uintptr {
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return IOC(IOC_READ|IOC_WRITE, t, nr, size)
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}
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// IO generate IO
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func IO(t, nr uintptr) uintptr {
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return IOC(IOC_NONE, t, nr, 0)
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}
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// IOCTL send ioctl
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func IOCTL(fd, name, data uintptr) error {
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, name, data)
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if err != 0 {
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return syscall.Errno(err)
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}
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return nil
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}
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