Why ioctl failed

It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter incognitodiscforums Start date Sep 26, Hi, I was wondering if anyone on the Linux forum might have any advice for understanding what is happening here.

For some reason, the ioctl call from the user space to the kernel module function says one of the arguments is invalid, and I don't see that it is. Also, this is only the 2nd time I've ever posted a question to stack overflow, so I hope I followed your conventions correctly!

Using the ioctl. If anyone has any further comments they can make that may help me figure out where I've gone wrong, please let me know. Why do you need ioctl in a VM? Click to expand You must log in or register to reply here.

Members online brickwizard JasKinasis rado84 Oldhabbits celine If arg is 0, the calling process shall be unregistered and shall not receive further SIGPOLL signals for the stream associated with fildes. If several processes register to receive this signal for the same event on the same STREAM, each process shall be signaled when the event occurs.

It does not wait for a message to arrive. In addition, treatment of control messages by the STREAM head may be changed by setting any of the following flags in arg :. The application shall ensure that the len member in the databuf strbuf structure is set to the number of bytes of data information to be sent with the message, or to 0 if no data part is to be sent. The flags member specifies the type of message to be created. No partial message is sent.

This mechanism is provided to send ioctl requests to downstream modules and drivers. Also, I beg you, follow the kernel coding style. It would make it so much easier for us to help that way. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. Ask Question. Asked 6 years, 7 months ago. Active 6 years, 7 months ago. Viewed 1k times. Improve this question. Keith Thompson k 39 39 gold badges silver badges bronze badges.