On Mon, 26 Apr 2010, Arve Hjønnevåg wrote: > > If you insist on using ioctl for init, you should use the standard > > convention for passing variable-length data. The userspace program > > sets up a fixed-size buffer containing a pointer to the name and the > > name's length, and it passes the buffer's address as the ioctl > > argument. > > Are you sure that is the standard? I searched for ioctls with NAME in > their name and only found one that passed the name that way. The rest > used fixed length string buffers, or passed the buffersize to _IOC > like I do. For instance, input.h has ioctls to read string and > bitmasks where user space specify the buffer size as an argument to > the ioctl macro. These pass data from the kernel to user space, but I > don't passing a string length is any worse than passing a buffer size. You're right. Okay, I withdraw my objection. Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
