potential | An educational Promises/A spec compliant promise library | Reactive Programming library
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kandi X-RAY | potential Summary
An educational Promises/A+ spec compliant promise library
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QUESTION
I understand that after calling fork() the child process inherits the per-process file descriptor table of its parent (pointing to the same system-wide open file tables). Hence, when opening a file in a parent process and then calling fork(), both the child and parent can write to that file without overwriting one another's output (due to a shared offset in the open-file table entry).
However, suppose that, we call open() on some file after a fork (in both the parent and the child). Will this create a separate entries in the system-wide open file table, with a separate set of offsets and read-write permission flags for the child (despite the fact that it's technically the same file)? I've tried looking this up and I don't seem to be able to find a clear answer.
I'm asking this mainly since I was playing around with writing to files, and it seems like only one the outputs of the parent and child ends up in the file in the aforementioned situation. This seemed to imply that there are separate entries in the open file table for the two separate open calls, and hence separate offsets, so the slower process overwrites the output of the other process.
To illustrate this, consider the following code:
...ANSWER
Answered 2021-May-03 at 20:22There is a difference between a file and a file descriptor (FD).
All processes share the same files. They don't necessarily have access to the same files, and a file is not its name, either; two different processes which open the same name might not actually open the same file, for example if the first file were renamed or unlinked and a new file were associated with the name. But if they do open the same file, it's necessarily shared, and changes will be mutually visible.
But a file descriptor is not a file. It refers to a file (not a filename, see above), but it also contains other information, including a file position used for and updated by calls to read
and write
. (You can use "positioned" read and write, pread
and pwrite
, if you don't want to use the position in the FD.) File descriptors are shared between parent and child processes, and so the file position in the FD is also shared.
Another thing stored in the file descriptor (in the kernel, where user processes can't get at it) is the list of permitted actions (on Unix, read, write, and/or execute, and possibly others). Permissions are stored in the file directory, not in the file itself, and the requested permissions are copied into the file descriptor when the file is opened (if the permissions are available.) It's possible for a child process to have a different user or group than the parent, particularly if the parent is started with augmented permissions but drops them before spawning the child. A file descriptor for a file opened in this manner still has the same permissions uf it is shared with a child, even if the child would itself be able to open the file.
QUESTION
I'm working on a Chrome extension that integrates with a website. My users can do actions on this website when they are logged in to it.
I have a Socket.IO server that delivers commands to my Chrome extension. Once a command arrived, the extension invokes a local function from the host website. Then, the host website, which has an authenticated active session with its own API, will invoke some update/insert call.
I recently realized a potential security issue, which is - if anyone spoofs my server address on my extension clients organization, he can easily abuse it to send his own parameters on behalf of my server (image 2).
Is there any smart way to ensure my client communicates with the real server and not an imposter?
...ANSWER
Answered 2021-Jun-15 at 16:49Use HTTPS secured connection.
This is one of the features of HTTPS (SSL/TLS) - it can prevent a MITM attack and prevent the destination server from being impersonated.
QUESTION
I want to deal with an abstraction where I can store f1, f2, f3, f4, f5... where
...ANSWER
Answered 2021-Jun-13 at 04:23You can store them with a GADT, like this:
QUESTION
I have the following event which prevents spamming in discord and automatically mutes spammer. I took that code from a YouTube video. Here's the code:
...ANSWER
Answered 2021-Jun-14 at 16:27You need to fetch a certain amount of messages and filter it so you're only getting messages sent by the spammer then pass them to bulkDelete()
Here is a little example:
QUESTION
The problem is the following: I got a png file : example.png
that I filter using chan vese of
skimage.segmentation.chan_vese
- It's return a png file in black and white.
i detect segments around my new png file with
cv2.ximgproc.createFastLineDetector()
- it's return a list a segment
But the list of segments represent disjoint segments.
I use two naive methods to polygonize this list of segment:
-It's seems that cv2.ximgproc.createFastLineDetector()
create a almost continuous list so I just join by creating new segments:
ANSWER
Answered 2021-Jun-15 at 06:36So I use another library to solve this problem: OpenCV-python
We got have also the detection of segments( which are not disjoint) but with a hierarchy with the function findContours
. The hierarchy is useful since the function detects different polygons. This implies no problems of connections we could have with the other method like explain in the post
QUESTION
In ElasticSearch, what's the rough implementation for an AND-style boolean query where the fields are term
types? Does ElasticSearch run filter queries separately on each of the field, and then find their intersections?
For example, if I have something like
...ANSWER
Answered 2021-Jun-15 at 03:14That kind of queries are extremely fast. Moreover, you should use bool/filter
instead of bool/must
as that will leverage filter caches and reuse existing filters to run the subsequent queries even faster.
You should go through this article which explains all about how filter bitsets are working. The first article has been posted a few years ago, but the logic underneath is still pretty much the same in recent versions.
Also here is another article worth looking at.
QUESTION
does someone encounter this problem while installing - react-messenger-customer-chat? [Next.js, tailwind] Here is github repo: https://github.com/Yoctol/react-messenger-customer-chat
package.json
...ANSWER
Answered 2021-Jun-14 at 11:20The problem is here:
QUESTION
Some Background (feel free to skip):
I'm very new to Rust, I come from a Haskell background (just in case that gives you an idea of any misconceptions I might have).
I am trying to write a program which, given a bunch of inputs from a database, can create customisable reports. To do this I wanted to create a Field
datatype which is composable in a sort of DSL style. In Haskell my intuition would be to make Field
an instance of Functor
and Applicative
so that writing things like this would be possible:
ANSWER
Answered 2021-Jun-10 at 12:54So I seem to have fixed it, although I'm still not sure I understand exactly what I've done...
QUESTION
I wrote an AppleScript to synch my Reminders (via export to JSON). It runs great... from the Script Editor. As soon as I tried to run it on the command line via osascript
, I discovered it hits a wall when it tries to access reminders. After maybe a minute and a half, I get this error:
ANSWER
Answered 2021-Jun-07 at 06:12Wrap your script with timeout of 3600 seconds (1 hour). Your script time outs with default time = 2 minutes (120 seconds) per command. So,:
QUESTION
I'm working on making a function to create tables and I need to have some conditional rules involved for formatting. One will be based on a column name, however when I send it down using as.formula
it seems to be over doing it. I've made an example here:
ANSWER
Answered 2021-Jun-12 at 21:11We could specify the j
with the column names of the data created i.e. startsWith
returns a logical
vector from the column names based on the names that starts with 'b', use the logical vector to extract the column names with [
(nm1).
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