ioctl | A small Go package for executing ioctls
kandi X-RAY | ioctl Summary
kandi X-RAY | ioctl Summary
Package ioctl provides facilities to define ioctl numbers and perform ioctls against file descriptors. See the documentation at For the time being, pacakge ioctl is only tested and used on amd64, and arm (thanks to @tv42), but it should work on other architectures too, based on my (admittedly rather cursory) reading of Linux header files. Please file a bug if the numbers are wrong for your architecture. Package ioctl is pure Go, but running tests requires a C compiler and the appropriate C headers. See internal/cgoioctl. Package ioctl presents itself as a Go module. The current version is v0.9.0.
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QUESTION
I see into header file
...ANSWER
Answered 2021-Jun-06 at 10:46The way of constructing of ioctl number is described at the top of the header include/uapi/asm-generic/ioctl.h:
ioctl command encoding: 32 bits total, command in lower 16 bits, size of the parameter structure in the lower 14 bits of the upper 16 bits.
...
De facto, however, the top 8 bits of the lower 16 bits are indeed used as a type field
That is, an ioctl number is constructed from 4 fields, from upper to lower:
dir
- direction, 2 bits.- Upper bit denotes that a user writes an argument,
- Lower bit denotes that a user reads an argument.
size
- size of the argument, 14 bits.type
- a number uniquely representing a driver, 8 bit.nr
- a number which is unique for the type (for the driver), 8 bit.
For decode
QUESTION
I want witch /dev/i2c-1
device to be outside the SELinux security policy on Android 10.
I have the source code for Android 10. I tried creating a .te
file in /device/thales/mt8768q/sepolicy/edgelab.te
In foo.te, I added a similar example to the site: https://source.android.com/security/selinux/customize.
...ANSWER
Answered 2021-Jun-04 at 02:04Your should define your domain and label.
Define your dev_type (device/"manufacturer"/"device-name"/sepolicy/"your-filename".te):
type i2c-1_device, dev_type;
Label file with your type (device/"manufacturer"/"device-name"/sepolicy/file_contexts):
/dev/i2c-1/* u:object_r:i2c-1_device:s0
Define your rule (device/"manufacturer"/"device-name"/"your-filename".te):
allow domain i2c-1_device:chr_file rw_file_perms
You'd better define your domain and restrict only your domain can access i2c-1_device. The example define an dhcp domain, it's an good example.
QUESTION
so I will detail so that we can easily understand
I have to make a driver for a pcie card, I already have the driver that I wrote in kmdf, now I am using this driver, unfortunately I find myself stuck, I have to write an application (which for example would call the METHOD_IN_DIRECT function that I defined in a switch case in my IoDeviceControl)
I therefore tried to start from an example on github and modified it so that it works ... but obviously as this example is for a NONpnp driver it is not usable for my driver which is pnp.
So I looked for examples of applications that worked with a pnp driver to see the model / shape, but I can't find a tutorial / sites / example on the realization of this famous application, one of the only sites that spoke about it was saying:
"Set an interface guide so the application can find the device and talk to it."
now my question is:
"how to write an aplication to control a PNP driver"
the main in "test.c":
...ANSWER
Answered 2021-Jun-03 at 16:02You need to obtain the device path using the SetupDi
functions as shown in this answer.
QUESTION
I'm running a command to my containerized Hbase DB from the subprocess.run
function:
ANSWER
Answered 2021-Jun-01 at 05:56You can't nest double quotes like that. Assuming we can correctly guess what you are attempting to say, try
QUESTION
Okay, this is a very strange case of this "No secret key" error. I've looked at all the other answers related to this and none of them are related to my problem.
On my machine I do this..
...ANSWER
Answered 2021-May-29 at 01:26I'm an idiot, lol. the stdin is already consumed, so it can't prompt for a password at that point, unless I used a gui password prompt
QUESTION
I am learning routing with tuntap interfaces... and I had created a tun0 interface and configured Ip address with ifconfig command on different subnet and adding the gateway with ip route command and I have also used masquerading rule ... my doubt is can i ping with tuntap interface or they are only used to route the traffic or something I don't know about these interface or may be misconfiguration..
May be this question sounds me new bie and I am but give please give me correct direction..
Ok Gerhardh,
Edit: I had created tun dev like this:
...ANSWER
Answered 2021-May-27 at 10:32Standard network interfaces have a piece of hardware behind them (a network card).
Tuntap don't:
https://www.kernel.org/doc/Documentation/networking/tuntap.txt
tl;dr: packets sent to a tuntap interface are handed over to a user-space program for processing. This program takes on the role of the network card in some way (example: openvpn). Unless there is a program taking packets out of the device and doing something meaningful with them, they will vanish into the void (like a network card with a disconnected cable).
QUESTION
I am trying to implement a mini version of bash using Termcap
capabilities, and now I am trying to read user's input and retype it in the terminal Stdout.
Every thing is working fine, but the problem occurs when trying to resize the terminal window, as you can see in the below gif, when I write a SINGLE line and then shrink the window, and expand it again the output wraps good as it should.
But when my text goes past the first terminal line (without pressing Enter), if I do the same steps as before, the output wrapping is different from what I want. What I need is that the last characters of the first line must join with the second line characters when shrinking the window, and vice versa when I expand the window the first characters of the second line join with the first line characters.
Is there a way to make the outputted lines wrap exactly the same as bash ? (joining lines with each other)
Here is my code so far, use -ltermcap
flag when you want to compile it and Thanks in advance.
ANSWER
Answered 2021-May-13 at 00:22Your terminal remembers where there are actual line skips (the one that you do explicitly with cursor_down in move_cursor_down_vertically()
), as opposed to line wraps the terminal does on its own due to its limited width.
So:
- either you don't move (downwards) your cursor at all and do all your processing on only one virtual line of text, letting the terminal wrap that line according to its width (this is probably the easiest solution);
- or you redraw the screen yourself in
sigwinch_handler()
when you receive the SIGWINCH signal.
QUESTION
I have the need to access the network interfaces on my device. I have the below code that does that but I am missing the ones that are active but with no IP address associated to them. Any idea on how programmatically I could gather the information from those?
The code posted has the functions to get the information from the interface, function to list all interfaces and a main to test.
Thanks
...ANSWER
Answered 2021-May-04 at 21:15This code is problematic in a few ways:
QUESTION
Background:
I have an old Seagate BlackArmor NAS 110 that I'm trying to install Debian on by following the instructions here: https://github.com/hn/seagate-blackarmor-nas.
I have a couple of USB to TTL serial adapters (one FTDI chipset and the other Prolific) that I've tried and have run into the same issue with both. I have made the connection to the serial port on the board of the NAS using a multimeter to make sure I've gotten the pinout correct.
Problem:
I'm not able to stop the autoboot process by pressing keys and any point during the boot process. The device also does not seem to respond to any keystrokes although they are echoed back.
What I've Tried So Far:
- Using USB to TTL serial adapters with two different chipsets
- Using the adapters on two different computers (MacBook Pro and a ThinkPad)
- Using different operating systems (MacOS, Windows 10, Ubuntu 20.04)
- Using different terminal programs (Screen, Minicom, Putty)
- Turned off hardware and software flow control
- Tested output of adapters by shorting RX and TX pins and seeing keystrokes echoed back
- Commands seem to be sent to device as when I type I see my commands echoed back (not sure if this is supposed to happen)
I've been at this for a few days and can't figure it out. I've also recorded my screen while experiencing the issue: https://streamable.com/xl43br. Can anyone see where I'm going wrong?
Terminal output while experiencing the problem:
...ANSWER
Answered 2021-Apr-22 at 15:51So it turns out there is a short somewhere between the RX pin and the +3.3V pin which is not allowing me to send anything to the board. Thank you to those who have commented.
QUESTION
I am writing a program that changes the color of the characters based on their position in the terminal. I need to get the cursor position at least once in order to do this. I do not need the row, only the column is of interest.
I looked it up and I found the ANSI escape sequence ESC[6n
which is supposed to return the current position of the cursor in stdin
, in the following format: ESC[;R
.
I wrote a small test program (largely inspired by this answer) through which I tried to isolate the behavior of this escape sequence, and it is able to get the row number correctly, but for some reason, the column is always 1.
Here's a piece of relevant C code:
...ANSWER
Answered 2021-Apr-22 at 11:38Replace printf("some text");
with write(1,"some text", 9);
and you'll get the expected cursor position.
You make a wrong assertion about cursor position moved with clib printf
, POSIX/ANSI C doesn't specify that this one should move the cursor.
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