TraceFs: ioctl: inappropriate ioctl for device

Question

Hi I am getting this error: ioctl: inappropriate ioctl for device on the ioctl() call shown below.

fd = open(mount, O_RDONLY);

destid = ioctl(fd, TRACEFS_IOCTL_ADD_OUTPUT_DRIVERS, data);



#define IOCBASE 10

#define TRACEFS_IOCTL_ADD_OUTPUT_DRIVERS    _IOW(0x15, IOCBASE + 0, int)

I am not sure how to debug this issue or go about resolving the error.

Any help would be greatly appreciated. Thanks.

Answer 1

That ioctl is only available with TraceFS (a specific filesystem). I assume you need to mount the filesystem as TraceFS to fix the problem.