A process is an instance of a computer program that is being executed.

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Is it possible to make an exec call that “returns”?

Is there a way to make the exec system call work like a function call that returns instead of totally replacing the current process image? My motivation is trying to integrate two shells with ...
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108 views

Disable networking only inside of a single terminal

I want to run a command in the terminal to disable networking, just in that terminal. How can that be accomplished? I'm running OSX. Note: I only want to disable the networking in that terminal. ...
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418 views

Strange cpu usage values reported by pidstat

I have a script that reports the cpu usage of a specific program reading values from pidstat. The script launches as: pidstat -C ^frontend$ -h -l -p ALL 1 1 The values reported this way sometimes ...
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36 views

What process state(s) is counted into cpu time?

Two observations of mine (correct me if wrong): In the output of time for timing a process, 'User' and 'Sys' come from wait (2) or times (2), depending on the particular system. In Linux ...
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191 views

Kill a whole process tree regardless different GIDs

I am having issues with process control using the signals available to the process abstraction. In the example below you can see there is a perl script which is the parent of the whole tree with a ...
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204 views

Can I get WCHAN from ps on Mac OS X 10.7.4?

From the manual it seems that ps -AO wchan should tell me what everything is sleeping on, but everything comes up as -. (And nwchan as 0). Did they do away with the old sleep()/tsleep() interface in ...
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39 views

How to get the executed command of a process which has completed successfully using the PID?

I have small script, abc.ksh that takes 3 parameter e.g abc.ksh ${a} ${b} ${c} I will read from a config file with 'n' no of entires and I will execute abc.ksh 'n' times in parallel using a for loop. ...
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60 views

When waiting on a pagefault, in what kind of sleep is a task?

Are tasks put into interruptible/uninterruptible/killable sleep when waiting on a pagefault? Does it matter, what kind of pagefault is it?
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48 views

Detect which program is blocked by firewall

The linux firewall can show a lot of information in the LOG target, for example via --log-uid. How can the executable doing the network call be logged, too? I did not find anything in the FAQ, the ...
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52 views

Find which process is being joined by another?

If I have opened Nautilus and spawned a new Nautilus instance, a new PID is created for the new Nautilus instance. Shortly after, the instance is joined with the main Nautilus program running. Main ...
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32 views

Identify process

Every couple of minutes my Mac OSX machine starts running a process that consumes 10% of the CPU. It runs for a couple of seconds and then stops. I can see the process coming up in 'Top', but the name ...
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127 views

“Restart” a process in the same terminal?

I put "restart" in quotes because the following question on SO illustrates what I'm trying to do: http://stackoverflow.com/questions/27957091/restarting-a-process-in-the-same-linux-terminal I'm ...
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346 views

Monitor the creation of new processes

I want to get a notification whenever a new process is created. I've tried to use inotify on /proc, but it didn't report any event even though a new directory appeared in /proc. I could list the ...
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63 views

What uses Linux “application memory”?

Just for fun, I wanted to watch what ls -lR / does to my "buffers" memory on a Linux system. As expected, the value increased. But I noticed that the "application memory" (i.e. "used" - (buffers + ...
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56 views

What does the “k” metric mean in the “sa” output?

From man sa: k cpu-time averaged core usage, in 1k units My questions: How is it calculated? What is the significance?
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68 views

Why do some processes pass on their cpu usage to another process when it ends?

I have wondered this for a while. For example, lets say process1 is a process that uses a lot of cpu power, like 90%. Its a video game. Then i have process2 which uses 10-12% cpu. Its a web browser. ...
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311 views

API Monitoring and Hooking

I am currently reading the "Malware Analyst's Cookbook and DVD". There is a chapter "Dynamic Analysis" and there are also some recipes about hooking and monitoring API calls of process but it is for ...
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81 views

Why are the process priorities not respected?

I was running four jobs in the background with HTCondor. It sets the priority to 10. Then I was compiling something with make -j4 in the foreground (priority 0). However, the HTCondor jobs still got ...
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113 views

Cgroups - memory subsystem

I want to set the memory.limit_in_bytes parameter for a control group and disable OOM, so processes freeze when the limit is reached. But i want to change that limit dynamically, if there is more ...
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152 views

CGroup Processes Not Terminated even when main process has been killed through Systemctl stop command

I am running systemctl stop process command for some process. Please find the output for systemctl status process below: Loaded: loaded Active: deactivating (stop-sigterm) CGroup: ...
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126 views

Getting non-stored password from Icedove

I've recently changed my mail password (because of Heartbleed), but I've forgotten the new one. When entering the new password in Icedove, I didn't think of clicking "remember password", but the ...
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545 views

how to stop kernel threads preempting real time user space processes?

I created some processes in user space and tried to visualize its working in kernelshark with the trace recorded using trace-cmd. But kernel processes like the ones shown below are preempting my ...
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543 views

gnome-terminal cmd leaving processes open after closing parent window

The following simple command should demonstrate my issue: gnome-terminal --tab -t "Tab 1" -e "/bin/bash" --tab -t "Tab 2" -e "/bin/bash" This should open a new window with two tabs and an active ...
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165 views

How to find current chroot jail path on Linux <2.6.26

While running kernel 2.6.26 or newer it's possible to get the path of the current chroot jail by comparing the mountinfo of the current process and the init process. Is there a way to get the same ...
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34 views

apt-get failed to fork in UML (user mode Linux)

I'm running a user mode Linux (Linux-3.19.8) for development testing. I'd like to be able to edit files inside the UML. I have some experience with Vim, so I'd prefer that. But unfortunately when I ...
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132 views

What is the command erepc? Is this malware?

I noticed that my system was running slower than normal so I ran a top command. Hogging a ton of my CPU was a process called erepc that I can find no information on. PID USER PR NI VIRT ...
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18 views

Starting isolated namespace inside network namespace

I've managed to create two network namespaces (ns1 and ns2) and connect them via veth connection. They can ping each other fine, and even ssh one into another (provided I started sshd). What I would ...
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20 views

killing subprocesses and traps

I have the following two scripts which simulate some work: start.sh simply launches 2 (mpi) processes with script mpiproc.sh. start.sh #!/bin/bash function trap_with_arg() { func="$1" ; shift ...
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21 views

Pipe output of process that's already running

I've got a process that spews out a lot of output, and it's going to be running for the next hour. I forgot to pipe its output through my awk script before I started running it. Now my terminal is ...
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11 views

What is the equivalent of pstop on OSX?

Is there an equivalent of pstop in OSX? How is pstop different to kill?
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28 views

Real-time monitoring of changes in swap use (per process)

I'm looking for a way to observe which processes in my system are consuming an increasing amount of swap over time. The following function generates a list of swap user per process : sbp(){ grep ...
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54 views

Background processes in ksh script are disappearing after they are kicked off

I'm having an issue with a KSH script that is supposed to kick off four processes in parallel in the background and then poll their status. Put simply, running the four processes sequentially would ...
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9 views

How to see the variables current value of a running matlab process on tmux?

I have a matlab process in tmux which is running for days. Actually I need to see the values of calculated variables till now. I thought that, it is good(if possible) to duplicate the process and then ...
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30 views

What is the best practice for setting a process niceness?

I have an agent which runs on my customer's hosts. I want this agent to leave the smallest possible footprint on their hosts, that is, I don't want to degrade my customers' performance. My agent runs ...
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28 views

i3pystatus-python process blocks suspend and shutdown

After using my arch-linux system a decent time, it can happen, that the i3pystatus process is not freezable anymore. As a result I can't suspend my laptop anymore. Killing the process (killall -9 ...
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67 views

CentOS Running process not responding to kill signals and not context switched

An updatedb process on my linux server is not responding to kill signals. (kill -9 or SIGSTOP) [root@chroot-1 ~]# ps auwx | grep -i 4505 root 4505 99.5 0.0 59544 1256 ? RN 09:43 ...
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34 views

Cannot terminate for loop in terminal

I was running a for loop in terminal which has a sox command in it. For some reason the sox command failed and now I cannot terminate the for loop. I tried pressing Ctrl+c many times, Ctrl+z many ...
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21 views

How to stop a program that is not showing up using monit?

I have a set of raspberry running raspbian. On each of these, I have configured monit to monitor the epiphany browser, which should always show up with a specific web site. Unfortunatly, some times ...
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12 views

Definitions arguments of daemon and server

Somehow, I feel clear about definitions of daemon and server after learn a little bit about X11. So, I would like to have verification to my definitions as below. Daemon is a process that is not ...
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36 views

If processes can't modify their parent's environment, what is MC doing?

As far as I know, a process cannot modify its parent's environment. However, when I run mc (GNU's Midnight Commander, a curses-based file manager) and then quit it, I end up with another $PWD: ...
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30 views

Is there any considerations I should take when running untrusted apps as non-root user?

I have to use an application I don't trust (unstable) and I will run it as a non-privileged user so if something bad happens the damage would be limited to the home folder of that user. I removed ...
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145 views

Create tree of processes

I'm implementing pstree as an assignment, and I would like to create test tree of processes, but I'm struggling to do so. I tried to do something like this to create tree of background processes ...
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583 views

Why does my redhat 5.11 system have so many ext4-dio-unwrit processes?

I have a redhat 5.11 system running, and it looks like there are 32 of these processes. What are they, and why are there so many of them?
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83 views

process blocked in msgrcv

I have a process that is blocked in msgrcv as shown by ps -eo pid,tid,wchan. Is there any way to find the PID of the process that my process is expecting to receive a message from? The communication ...
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247 views

Stop all processes by a user: children of supervisord are still running

I'm trying to delete a user but it keeps saying that user is currently used by process ID x I tried everything here and here, nothing works, how do I kill all the process by a certain user in order ...
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154 views

pkill -P $ID working while kill — -$ID not

I was playing around with creating and killing process groups on linux ( ubuntu ) I am trying to kill a process group and am being driven crazy by the fact that pkill -P $ID works while kill -- -$ID ...
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30 views

Spawning processes on a job stack

I have a hobbyist server on which I want users to upload a file, and then receive the overcome of some processing (server-side) over the given file. I am doing the processing synchronously so that for ...
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129 views

monitor a process by matching the full cmdline

I'm looking for a software that can monitor a process (specified as a partial string/regexp match (e.g. grepping) in its full command-line) in terms of cpu and memory usage. If any of those processes ...
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292 views

Are there any alternatives to pidof? (smaller footprint)

Well, I've just found out that with extensive usage of pidof in very short intervals, the seemingly tiny tool can be a great CPU hog. (Source: top) On my older machine, it can easily reach 30 percent ...
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333 views

Measuring context switches of a LWP gives incorrect results. Why?

I have a Java thread pinned at my cpu core. It is busy spinning and I see through top that it is running fine: %Cpu0 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : ...