Questions tagged [pid]
Use this tag for questions about Process ID. For questions about PID-controllers, use [pid-controller] instead.
1,725
questions
0
votes
1
answer
24
views
If the Linux kernel reassigns a PID, can this cause errors/UB when using C pthread mutexes?
If I'm getting it right, is it possible in the Linux pthread C API to use robust mutexes, that can be shared across processes (by placing them in shared memory), and that allows you to acquire the ...
0
votes
1
answer
29
views
how to change the terminal prompt (bash) in vs code mac
so my terminal prompt in vs code mac is showing the process ID and then $. my current shell is bash. but i want my prompt to say the literal name of the directory that i am in and then a $ sign. if ...
-2
votes
3
answers
138
views
if(fork()) and if(!fork()) - how do they work?
Let's say we have the following:
pid_t pid;
pid = fork();
if(pid == 0) {
if(fork()) printf("A");
else printf("B");
printf("C");
}
else {
...
0
votes
0
answers
17
views
How to avoid races with process IDs when reading /proc
As I understand it, on Linux process IDs are reused, and also the only API for a lot of process-related stuff (e.g. finding child processes of a specific process) is /proc/<pid>/....
But don't ...
- 93.6k
0
votes
1
answer
31
views
How do I determine thread index in its thread group from inside of the kernel?
I need, for a given thread group, to get each of its member threads sequential index to store some data about each thread from inside of the kernel, I have access to task_struct. Something like "...
- 463
2
votes
0
answers
47
views
Force parent process to be set to init(1) when process is orphaned
I have a process (X) that is spawned by another process (Y). Prior to the spawn, Y set itself as a subreaper (using prctrl PR_SET_CHILD_SUBREAPER). Is there any way a fork from X can skip Y and have ...
- 21.2k
2
votes
1
answer
51
views
How to get the PID of a process launched from another process with the execlp c function?
I am working with a Debian (Linux like) OS writing code in c.
I am a running process (let's call it "A") which needs to launch an executable program AND to get its PID when the new process &...
- 430
1
vote
0
answers
48
views
from where the child process will get informations about other variables that are before the fork()?
in my case i have a code where there are mentioned many fork() (8 times) functions so many child processes are going to be created , so let's imagine the every fork() is related to its variable like ...
0
votes
0
answers
34
views
Robotics PD controller
I'd like to share my code. I'm having trouble understanding why my robot doesn't reach the desired positions when I increase the value of Kp. The robot has six degrees of freedom, and I'm using a PD ...
- 19
0
votes
0
answers
19
views
Persistent PID Issue with npm run dev Causing 'Connection Reset' Error
Hi I'm encountering a recurring issue with my project setup vite 5173 dev mode. Every time I run npm run dev, I face the following error in my browser:
The connection was reset
The connection to the ...
0
votes
0
answers
23
views
the process made twice, when i execute my program once
In Linux, I have just simple test code to testing process made
once or twice.
when I execute my program
program is just sleep 2seconds and print something inside for loop
sudo ./test &
the ...
- 155
3
votes
0
answers
92
views
Is there a correct way to do PID/TID caching?
Consider the following code:
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <stdio.h>
int main() {
pid_t tid = gettid();
printf("tid: %d"...
- 199
1
vote
0
answers
30
views
Finding pid for python script B execution on a terminal using popen from python script A
I have a python script "A" that uses subprocess.Popen to launch a gnome-terminal and then executes a different python script "B" in there. I am stuck with retrieving the pid for ...
- 405
0
votes
0
answers
46
views
Why Java CPU usage show different inside node vs portal?
I am trying to find out answer to that problem. Cluster has 5 nodes (on autoscaling mode), nodes are 8CPU, 64G RAM.
When I get inside 2 nodes I see 100% CPU taken by java process (java is taking only ...
0
votes
0
answers
7
views
how to calculate Live threat of any process using shell commands?
how to calculate Live threat of any process using shell commands?
i need help it is just like jconsole thread monitor. please help me out to get someone can to get live . peak and total thread monitor ...
