This can be difficult, so there was a period of transition during which old drivers still worked (using ioctl) but new drivers could use the improved interface (unlocked_ioctl). Eventually all drivers were converted and ioctl could be removed. compat_ioctl is actually unrelated, even though it was added at the same time.

Dec 16, 2018 · The kernel maintainers dislike ioctl because it makes kernel code and application code too interdependent, and it is hard to keep both of them in step across kernel versions and architectures." [Page 255]"Mastering Embedded Linux Programming" by Chris Simmonds [2017].

Nov 26, 2021 · So, the assumption in the linked question that two versions are available for the ioctl function inside a Linux kernel module is wrong. Only unlocked_ioctl (version 2) must be used.

Jul 1, 2021 · Is this particular ioctl() call (with the GPIO_V2... argument) theoretically (potentially) blocking in the same way that writing to an arbitrary file descriptor can be? Are ioctl() calls in general theoretically blocking? For example, requesting the line in the first place also involves an ioctl() on a fd for the chip. What about I2C ioctl() s?

Am I right that all input typed from the keyboard goes through a controlling terminal? That means that if a program is run without a controlling terminal, it won't be able to receive any user input...

I enter the password once and the script passes it to the various commands. In most instances the here-document approach handles this fine. However, in one case I get this error: Enter VNC password: stty: standard input: Inappropriate ioctl for device Verify password: stty: standard input: Inappropriate ioctl for device

Jul 6, 2019 · How to I set the permissions necessary to make the ioctl CDROM_SEND_PACKET command run?

May 16, 2023 · The ioctl system call takes a parameter list that varies a lot depending on the request. Many requests take structured data as input or produce structured data as output. This makes it awkward to use from the shell. There are of course commands that wrap around a specific ioctl request or a specific set — for example stty with terminal ioctl — but not generic …

May 7, 2020 · I'm currently setting the baudrate of my can0 with ip link: /sbin/ip link set can0 up type can bitrate 250000 I'm just wondering how to do the same from within C/C++?

Jan 9, 2016 · In Unix, IOCTL (I/O control) is a catch-all system call to ask for random, device-dependent actions. The exact calls supported, what actions can be requested, and so on, are extremely operating system (and device driver) dependent. You'll probably find some "standard" ones agree between Unices, but not across the board. To Windows, just forget it.