mirror of https://github.com/jetkvm/kvm.git
46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
package ioctl
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// https://github.com/torvalds/linux/blob/master/include/uapi/asm-generic/ioctl.h
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const (
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NONE = 0x0
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READ = 0x1
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WRITE = 0x2
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)
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// The ioctl command. It encodes direction (read/write), argument size
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// and a type/number, where type should be globally unique and number
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// is unique to the driver.
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type Command uint32
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// New constructs an ioctl command. size should be less than 16kb.
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func New(dir byte, typ byte, nr byte, size uintptr) Command {
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if size >= (1 << 14) {
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panic("invalid ioctl sizeof")
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}
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return Command(dir)<<(14+16) |
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Command(size)<<16 |
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Command(typ)<<8 |
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Command(nr)
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}
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// Read returns true if the ioctl reads data
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func (c Command) Read() bool {
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return (c>>(14+16))&READ != 0
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}
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// Write returns true if the ioctl writes data
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func (c Command) Write() bool {
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return (c>>(14+16))&WRITE != 0
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}
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// Number returns the lower 8 bits of the command
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func (c Command) Number() byte {
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return byte(c & 0xff)
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}
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// Type returns the upper 8 bits of the command
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func (c Command) Type() byte {
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return byte((c >> 8) & 0xff)
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}
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