Questions tagged [async]

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Asynchronous downloading from virtual machine?

I have some files stored on a virtual machine that I'm downloading onto my PC. There are approximately 1 million files and I have been using the following command: scp vm_user@IP:/home/vm_user/...
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How to properly code for async def and with open (file) operation

With this code, given a list of phone numbers inside numbers.txt, it should first add the contact from the current line to my account, then from results return the user_id if the phone number has a ...
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2 votes
2 answers
757 views

How to attach a listener to sysfs files?

How to watch for sysfs file changes (like /sys/class/net/eth0/statistics/operstate) and execute a command on content change? inotify does not work on sysfs I don't want to poll. I want to set a ...
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3 votes
2 answers
723 views

Stopping an asynchronous while loop in a shell script

I have a asynchronous while loop that restarts processes until some condition is met. This look something like this: (while [ "$check_condition" -eq 1 ]; do ./async_command done) & ....
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1 answer
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Why does io_uring have a layer of indirection for the submission queue?

From the paper on io_uring, the submission ring contains indices into a submission array, where the submission event itself is stored. The documentation explains this layer of indirection as follows: ...
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3 votes
1 answer
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How to set interval for an asynchronous command in bash?

I'm trying to achieve this while condition; do var=value1 ### update value every 5s while sleep 5; do var=value2 done ### ... [ rest of code ] done The problem here is that the script will ...
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3 votes
1 answer
1k views

To sync or not to sync in an embedded environment?

I have a single board appliance that runs Debian 10 on a chunk of flash. UBIFS is used, and is split into two volumes: an ro roots, and an rw /var. I have found that under power cycling/reset ...
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1 vote
1 answer
298 views

Enabling Asynchronous IO at HP-UX Operating System

We are using HP-UX Itanium version B.11.31 and this server is used for running Sybase database version ASE15.7. I would like to know how to enable Asynchronous IO at Operating System level. I went ...
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Asynchronous background jobs in linux can interfere to each other?

I was trying to use a linux command repeatedly and I decided to use bash scripting. The command is curl and it has blue screen given to the target web server. I was doing this as a pentester in my ...
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1 answer
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Linux AIO / io_submit / io_getevents / on fifo (named pipes)

I have to write a lot of data to a pipe. Can I use the Linux calls io_submit/io_getevents for writing to Named Pipes or it is defined only for regular files. I tried finding any document which ...
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2 votes
1 answer
587 views

What does "asynchronous" mean in these cases?

I have asked what "asynchronous" means a while ago for interrupts. Now I have the same question but for running shell commands and for cancelling threads. From Bash manual If a command is ...
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3 votes
1 answer
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Messages on new terminal after using nohup

I'm trying to run a few commands asynchronously on a login script (.bash_profile). When I open a new terminal, I see messages like this. They also show up when I log onto a system over SSH. Last ...
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9 votes
1 answer
5k views

Save cursor position and restore it in terminal

I am playing with some terminal capabilities to create async prompt output on bash. I want to get something like this: while outputting string in PROMPT_COMMAND, save terminal cursor position, print ...
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0 votes
1 answer
313 views

Process switch with clone() [closed]

Now, I have to write a c program and use clone() to make process do things asynchronous. I've read the manual of clone(); however, I still don't know how to make it work asynchronous. I use flags ...
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  • 103
160 votes
6 answers
81k views

Can I watch the progress of a `sync` operation?

I've copied a large file to a USB disk mounted on a Linux system with async. This returns to a command prompt relatively quickly, but when I type sync, of course, it all has to go to disk, and that ...
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  • 38k
2 votes
1 answer
344 views

Set a callback for when a certain process is spawned

The script I'm writing launches process A, which after an uncertain amount of time, launches a child process B. I need the script to execute a command C which depends on process B. But B might not be ...
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1 vote
2 answers
2k views

run script asynchronously / in a different process

I have a simple php script <?php for($i=0;$i<10;$i++){ sleep(1); echo $i; } Which I run from the command line php myfile.php & I would expect I can do other things in the command line, ...
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4 votes
1 answer
1k views

Populate PS1 asynchronously

I have a few git svn related functions that see if I have to pull/push from/to the repository. My problem is that the functions I've written to gather this information are too slow. I'd like to make ...
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