ioctl (Input Output ConTroL) is a system call for device-specific I/O operations and other operations which cannot be expressed by regular system calls and it provides an interface through which an application can communicate directly with a device driver(or any other global kernel space variables). Applications can use the standard control codes or device-specific control codes to perform direct input and output operations.
Questions tagged [ioctl]
691 questions
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ioctl to detect a disc in upside direction
I am trying to find whether a disc is inverted in upside direction, or there is no disc.Till now I am getting NO_DISC even when I am inserting a disc in Upside direction.Please anyone tell me if there is any possible ioctl available through which I…
Sanjeev Kumar
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ioctl HDIO_GET_IDENTITY fails on USB storage devices
I am trying to get the identity of a USB Hard Drive connected through a SATA-to-USB adapter. The little program I wrote is in Python and uses this:
def getID(dev):
HDIO_GET_IDENTITY = 0x030d
with open(dev, 'r') as fd:
buf =…
dragosmc
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ipadm show-addr on Solaris shows ? in the interface description
I tried to plumb an IP address on an IPMP interface using the below sample code, the interface gets plumbed correctly (correct output in ifconfig -a). But running just the "ipadm" command does not show the plumbed interface and the running "ipadm…
ktime
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ioctl TIOCGWINSZ in GNAT Ada returns errno 25, but C program work fine
On Mac OS X 10.9.5...
I'm tryng to get screen size using ioctl C-function
#include
#include
int main(int argc, char **argv)
{
struct winsize sz;
ioctl(0, TIOCGWINSZ, &sz);
printf("Screen width: %i Screen height:…
drblez
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- 2
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1 answer
Docker daemon on Debian 7 returns "inappropriate ioctl for device"
I just installed Docker on my Debian 7 system according to this guide. When trying to start the Docker daemon via docker -d, I receive the following output:
INFO[0000] +job serveapi(unix:///var/run/docker.sock)
INFO[0000] WARNING: You are running…
magic_al
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What's the best way to spy on IOCTLs?
I have a U9 Telit modem which, at first, appears as a disk drive on USB bus. Then, the native software after autorun and install, sends a couple of IOCTLs to tell the device to reappear as other things. I can see them in procmon.
I want to better…
Pavel Radzivilovsky
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Setting private ioctls without iwpriv
I need to write function that will set private ioctls such as:
iwpriv wlan5 p2p_set enable=0
iwpriv wlan0 p2p_set intent=1
I found in this code function which set integer private ioctls, so I tried to modify it but I have yet a poor understanding…
trivelt
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how to attach to a TAP interface from two different processes
I have a tap interface created like this:
ip tuntap add dev tap0 mode tap user myusername
ip link set tap0 up
I then attach to tap0 using python and another program written in C++
Python:
def tapAlloc(tapname, mode):
tap =…
brainydexter
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mount error in android terminal emulator: ioctl loop_set_fd failed device or resource busy
I am using PuTTY to open up a SSH terminal to my Android phone which has BusyBox 1.21.1 installed. I was trying to mount an ISO image with the following command in the terminal, mind the fact that I was already in superuser mode and my phone is…
saishme
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framebuffer output graphic tearing, FBIO_WAITFORVSYNC and FBIOPAN_DISPLAY failed
the question is about linux framebuffer, the graphic is tearing.
recently i work for the output desktop to SDI graphic card, then i catch the idea that using framebuffer. That's ok, it output success, but it has a big problem, the graphic is…
SimpleDrunk
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How are ioctl() and/or fcntl() used for writing a non-blocking socket?
I am trying to learn how to write a non-blocking socket. Can anyone please explain that what roles do ioctl() and fcntl() play in this (i.e. what are the roles of file descriptors in creating a non-blocking socket. A code snippet as an example with…
Mac
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2 answers
ioct multiple arguments passing
I try to pass two arguments from user space program to change a buffer size and number of buffer on char device. I tried multiple cast I get always cast errors
error: cannot convert to a pointer type copy_from_user((char *)msg, arg,…
user2948075
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copy_from_user() failed for intel x-86 processor but execute fine to ppc e500 processor
I am working on Linux Kernel Usrspace and Kernel space communication,
I am using two target boards,
1) Board with PPC -e500 processor
2) Board with intel x-86 processor
Following peace of code working on e500 processor but same code is giving…
Pravin.2087
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1 answer
ioctl call program compiling error
I want to call kernel module driver.ko ioctl from user space with c program. when compiling I got this error
header.h:13:38: error: expected expression before ‘char’
#define IOCTL_CMD _IORW(MAGIC_NO, 0, char *)
by definition I put the right…
user2948075
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votes
2 answers
Is possible to check rights to ioctl
I'm writing network configuring system for embedded device, which uses ioctl calls.
On starting system I need to check rights to future calls.
Is possible to check enough or have not enough privileges to ioctl(ID) call without calling that ioctl?
Dcow
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