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 ...
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
linux - For a non-controlling process, is `ioctl(fd, TIOCNOTTY)` the ...
网页2019年1月4日 · @JdeBP a "controlling process" is a session leader with a controlling terminal. The linux _exit(2) manpage describes the same behavior as the _exit manpage from susv4, only that it's using the full defininition instead of that term.
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.
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.
Any tool to do ioctl () from bash? - Unix & Linux Stack Exchange
网页2023年5月16日 · Python has an ioctl function in the fnctl module. The termios module defines some symbolic names for terminal-related ioctl. The extra input/output can be passed as an integer or a byte string. In Python, an alternative approach could be the ctypes module, which is a very nice way to call C functions from a high-level language.
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 - Does keyboard input always go through a controlling …
网页No. Terminal applications read keyboard input from the device file (on Linux, something like /dev/ttyS0 or /dev/ttyUSB0... for a serial device, /dev/pts/0 for a pseudo-terminal device) corresponding to the terminal with the keyboard you're typing on. That device doesn't have to be the controlling terminal of the process (or any process for that ...