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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How to check for existing argument on ioctl
I want to try out how to use i/o-controls of a loadable kernel module, here a character device.
The question is: How to check if the ioctl call on userspace side has an argument or not. I found that on ioctl an argument is optional.
Inside the…
Alex44
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Link aggregation and status of network interfaces in "ipadm" command
I am again rephrasing the issue that we are facing:
We are creating link aggregations [dlmp groups] with two interfaces named net0 & net5:
# dladm create-aggr -m dlmp -l net0 -l net5 -l net2 aggr1
Setting prob targets for aggr1:
# dladm…
amithreat
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vxworks - ioctl(SIOCGIFCONF) error
ioctl(socketDescriptor, SIOCGIFCONF, &ifconf)
This ioctl call works fine when I use it in normal RTP, but gives the following error when used in .a libraries.
ENXIO i.e. "this driver or device was not found".
user4679636
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Dealing with file handles using Mono and P/Invoke
I have some code originally written in Python that I'm trying to convert to C#. It will be running on Linux.
The Python code, however, opens a file and then sends some Linux specific ioctl commands to the open file.
class i2c(object):
def…
user9993
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understanding of ioctl call from assembly
following piece of code is part of program present at this link http://dune.scs.stanford.edu/. I/we am/are not able to understand its dune.S file specifically following piece. I hope this piece is calling DUNE_ENTER ioctl command defined as
#define…
incompetent
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Differentiate between kernel and userspace IOCTLs
I have an IOCTL handling code in kernel space (Linux kernel version 3.10). In this code, I want to separate out the IOCTLs that have come from userspace from those which have come from kernel space. How can I achieve this? Thanks.
zeroByte
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How to pass SCSI command to hard disk on Vmware ESXi (6.0)
I want to develop an application to pass SCSI command to hard disk using C language.
In Linux, when pass SCSI or other command to device, we just use ioctl() function to do it.
But hard disk device node was not showed as /dev/sdx on VMware ESXi just…
Juan Li
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trying to read from stdout with NONBLOCKING set using winARM newlib lpc
I want read on stdout to be non-blocking. I was using the newlib-lpc library in WINarm to do this. But even though it is set as non-Blocking, the code stops at read every time and waits for a character to be received.
Here is my read…
ej_01
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file descriptor and loff_t offset in ioctl read and write interface
Recently i'm working on a sample code about the communication between kernel driver module and user space applications.
I have a question about the .read and .write interface in the file_operations().
According to LDD3:
ssize_t read(struct file…
uestclx
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Why can't I in python call HDIO_GETGEO?
#!/usr/bin/env python
# -*- coding: utf-8 -*-
########## THIS NOW WORKS! ##########
UNSUITABLE_ENVIRONMENT_ERROR = \
"This program requires at least Python 2.6 and Linux"
import sys
import struct
import os
from array import array
# +++…
user376403
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Incomplete type 'struct ifmediareq' (ioctl)
I'm trying to rewrite some source code and I have the following function:
tuntap_interface::if_ioctl(u_int32_t cmd, void *arg)
{
dprintf("tuntap: if ioctl: %d\n", (int) (cmd & 0xff));
switch (cmd) {
case SIOCSIFADDR:
{
…
Dan Ramos
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python library to access low-level detail of drive (SMART, scsi generic, ata security, etc)
Is there any python library to access low-level disk details?
I need:
SMART attributes
Serial number
Firmware version
SATA Phy counters
SMART Extended Self-test log records
Enclosure/letter/sg-device mapping
ATA Security command access
SCSI…
George Shuklin
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IOCtlSocket Ruby Winapi
Well, I'm trying to get the value of packets to be read by the recv with ioctlsocket(FIONREAD), But the function is not returning any value.
Look:
IOCtlSocket = Win32API.new('ws2_32', 'ioctlsocket', 'llp', 'i')
ret_val = -1
result =…
user3571412
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Semaphore will not wake up in the context of Ioctl
I have a device driver I am working on. It works this way:
1. User app sends ioctl cmd 0x01 to driver that puts it to sleep.
2. User app sends another ioctl cmd 0x02 to driver that wakes it up.
I am doing this because my hardware is not ready, so I…
user1316601
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why some ioctl cases always fails?
Recently, I am practicing a simple ioctl driver with three commands: print,get,set
In the ioctl switch statement, it looks like this pseudo-code:
switch (cmd) {
case "print":
break;
case "get":
break;
case "set":
break;
default:
…
Craig Yang
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