How to call c macro with parameters

[Blackrose]

Hi all, I try to use v to read/write data through spidev0.0 device. In c, the write data will called ioctl function.Below is example

ioctl(fd, SPI_IOC_MESSAGE(1), &tr);

the SPI_IOC_MESSAGE is a macro defined in file /usr/include/linux/spi/spidev.h. When I try to use v to call this macro, the v shows not found the function. I also try to call macro without parameter, it's good.

 error: unknown function: C.SPI_IOC_MESSAGE
rc := int(C.ioctl(this.fd, C.SPI_IOC_MESSAGE(1), &transfer))

Does the v not support call c macro with parameter? If so, how can this situation be resolved?

[JalonSolov]

You have to define C.SPI_IOC_MESSAGE in your V code, for V to recognize it. V does not parse .h files, so it cannot know about it otherwise.