What is the difference between ioctl (), unlocked_ioctl () and ... - linux
网页ioctl() is one of the remaining parts of the kernel which runs under the Big Kernel Lock (BKL). In the past, the usage of the BKL has made it possible for long-running ioctl() methods to create long latencies for unrelated processes. Follows an explanation of the patch that introduced unlocked_ioctl and compat_ioctl into 2.6.11.
Are ioctl calls blocking? - Unix & Linux Stack Exchange
网页2021年7月1日 — 1. Firstly, the GPIO uAPI ioctl() s are synchronous, that is they will not return until the operation is complete. They are not asynchronous, such that you initiate the operation and wait for a completion notification. So in response to your third question, there is no fd to wait on for a GPIO uAPI ioctl() to complete - the calling thread will ...
Is there any difference between #include <linux/ioctl.h> and …
网页2022年5月3日 — linux/ioctl.h shouldn’t be referenced directly in user code; however that’s what you’d use when writing a Linux driver. Basically, if you see #include <sys/ioctl.h>, you’re looking at program code; if you see #include <linux/ioctl.h>, you’re looking at either kernel (device driver) code, or program code with over-enthusiastic #includes.
IOCTL() Library for Windows - Unix & Linux Stack Exchange
网页2016年1月9日 — 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.
Two different function prototypes for Linux kernel module ioctl
网页2021年11月26日 — Then, correct me if I'm wrong. I must define some_ioctl() inside a kernel module which represents a character device file. some_ioctl() is like random_ioctl, but for my module. If, inside some_ioctl(), I need to use the struct inode, I will use version 1; instead, if
Usage difference between device files, ioctl, sysfs, netlink
网页2018年12月16日 — Adding more to confuse :" ioctl : However, ioctl is deprecated in the kernel, and you will find it hard to get any drivers with new uses of ioctl accepted upstream. 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 ...
c - "sys/ioctl.h" header in linux - Unix & Linux Stack Exchange
网页I am on Linux 2.6.32-26-generic When I look in to the linux source code for "ioctl.h" hearer file, I could see many variants.
Set can baudrate with ioctl or similar from C/C++
网页2020年5月7日 — Note that for setting the baudrate you don't need to set the ifi_flags. Instead, after adding the attribute that contains the can device name (using mnl_attr_put_str), you need to add a nested linkinfo object using mnl_attr_nest_start, mnl_attr_put_str. Next using those same functions you also need to add the can bittiming object (struct can ...
Understanding wpa_supplicant - Unix & Linux Stack Exchange
网页2016年3月10日 — This error: ioctl[SIOCSIWENCODEEXT]: Invalid argument is now gone! However ioctl[SIOCSIWAP]: Operation not permitted is still present. wpa_supplicant still won't work with now-unofficial nl80211 driver. Only this time output has a new message starting with deinit:
linux - setserial: Cannot get serial info: Inappropriate ioctl for ...
网页2016年5月11日 — This means that the driver does not support the IOCTL that setserial is using: setserial gets the information via an ioctl() call. In case the driver for your device does not support TIOCGSERIAL, the "invalid argument" is returned. (Debian bug report) I think stty should be able to perform any configuration you need for a USB-Serial device.