Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [linux-pm] [PATCH 2/9] PM: suspend_block: Add driver to access suspend blockers from user-space | Date | Wed, 28 Apr 2010 00:03:31 +0200 |
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On Tuesday 27 April 2010, Alan Stern wrote: > 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.
In the meantime, though, I thought that the suspend blocker might be created by _open() if we found a way to automatically choose a name for it. That'd be kind of logical, since it's later destroyed by _release().
So, what about using the name of the process that opened the special device file (or that name with'0' appended, or generally with a number appended) as the suspend blocker name?
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