Questions tagged [process]
A process is an instance of a computer program that is being executed.
2,611 questions
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Mapping two users to host with user namespaces
I'm trying to understand whether it's possible to map two users from a user namespace to two different users on the host.
The goal is to replicate the same permissions I have on my host inside a ...
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Why does there appear to be a discrepancy when trying to programmatically access files associated with different tasks in Linux from kernel space?
As a way to better understand Linux kernel structures, interacting with and pulling information from these (and also getting more experience coding in C), I've been building simple kernel modules to ...
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Can you use `inotify` with `/sys/fs/cgroup/pids.peak`?
I am trying to implement a program that would run as PID1 in a Podman container and would wait for the the user to podman exec into the container at least once before exiting. /sys/fs/cgroup/pids.peak ...
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What do programs use to read their environment?
I'm on Fedora, where all preinstalled shells apparently support bashisms: bash --posix does, and even sh. Still, when I used this function,
pathprepend () {
if [[ ":$PATH:" != *":$1:...
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How long has a process been idle since it last ran?
I am interested in finding out the last time a process was scheduled to run. That is, how long it has been sleeping, since it last ran. When was it last active? Basically, a generalization of what the ...
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Why read process doesn't show up in ps -ef
I open two terminal windows. In one, I run:
$ read foo
I don't press RETURN, so read is blocking. In the other terminal window, I search for the process:
$ ps -ef | grep foo
user 95292 94814 ...
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Writable and executable memory regions
I wrote a simple Python script to scan /proc/{pid}/maps for regions that are writable and executable on my computer. It came up with a few hits surprisingly, all private anonymous. Wondering why a ...
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What exactly does %wait in pidstat mean?
Environment
Ubuntu22.04
sysstat version 12.2.0
Number of logical CPUs 16
man pidstat shows the following, but I would like to know more specifically about the denominator and numerator of %wait.
...
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How to automatically terminate shell scripts after 1 minute of no output
I need to run multiple shell scripts sequentially (s1.sh, s2.sh, s3.sh) with the following requirement:
If a script produces no output (stdout or stderr) for 1 minute, it should be terminated
After ...
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Hit a strange signal settings of a kernel thread in Linux
I am working on an embedded Linux system (kernel-5.10.24), and using busybox as init.
Now I hit a strange problem about signal settings of a kernel thread in system.
The kernel thread is from a device ...
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Understanding the concepts of commands, processes and namespaces
I am not a strong linux user, but I want to better understand the material in this post here which talks about linux namespaces
https://stackoverflow.com/questions/44666700/unshare-pid-bin-bash-fork-...
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Linux Server swap memory problem
I have the same problem on all servers running Java processes.
I have lots of available memory. But my swap is full of Java-related pages.
But the system never cleans its swap, Java pages stay there &...
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CPU affinity after process cloning
I am cloning a process using the clone() glibc wrapper function. For some unrelated reasons, I need to set the CLONE_THREAD flag bit ON. It implies that
If CLONE_THREAD is set, the child is placed in ...
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Why do I have 2 bash processes when I openede only one terminal session?
I am using windows WSL2, and opened just one terminal session. I used the command ps and ps a. From what I know, the bash with PID 559 is the shell I am interacting with. The question is, why do I ...
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Are reads of /proc/pid/environ atomic in Linux 6.x (e.g: 6.1.99)?
When a process execs, looking at kernel code for environ_read(), it seems that if the mm_struct doesn't yet exist / is null or the env_end member of that mm_struct is null, environ_read() will return ...
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