goio-uring

Convert `ioctl` call in golang


I'm trying to convert, or at least understand this ioctl call:

#define NVME_URING_CMD_IO   _IOWR('N', 0x80, struct nvme_uring_cmd)

Is there an equivalent of _IOWR in golang? maybe with the unix package?


Solution

  • Ok, I managed to convert it, thanks to help in comments:

    
    const (
        IocNrBits           = 8
        IocTypeBits         = 8
        IocSizeBits         = 14
        IocNrShift          = 0
        IocRead     uintptr = 2
        IocWrite    uintptr = 2
    )
    
    const (
        IocTypeShift = IocNrShift + IocNrBits
        IocSizeShift = IocTypeShift + IocTypeBits
        IocDirshift  = IocSizeShift + IocSizeBits
    )
    
    func IOC(dir, t, nr, size uintptr) uintptr {
        return (dir << IocDirshift) |
            (t << IocTypeShift) |
            (nr << IocNrShift) |
            (size << IocSizeShift)
    }
    
    func IOWR(t, nr, size uintptr) uintptr {
        return IOC(IocRead|IocWrite, t, nr, size)
    }
    
    func NVME_URING_CMD_IO() uintptr {
        return IOWR('N', 0x80, 32)
    }