I had an interview , where the interviewer asked me the question "How to create and call a process in unix". I answered that we can use the command
FORK()/ CLONE() to create a process.
But I didn't have the answer for the second question, how to call a process.
how to call or resume a paused process in to another terminal.
View 1 Replies View RelatedI'm studying about signal in Linux Kernel and I got a problem about signal handler and output buffer.
I just want to know about stdout buffer related parent process and child process.
The problem is - parent process received SIGINT signal_handler that I implement is called. And after signal_handler is called, it print string "pid : xxx state : RUNNING" ... but after end of signal_handler function, child process might be print string but it isn't print at all.
I'm not asking right code, but I want to know why is this happened and concepts about signal handler, buffer - between parent process and child process.
here is a code signal_handler:
Quote:
void TC3_handler()
{
pid_t pid;
ProcState ps;
pid = GetProcessId();
[Code]....
chlid process counts number in infinite loop, but after call signal_handler, it can't print at all.. just waiting for SIGINT..
how to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?
View 5 Replies View RelatedHow to create a c program for an Orphan Process ?
View 5 Replies View RelatedCode:
root@sok-HP-ProBook-4520s:/usr/local/etc# motion
[0] Processing thread 0 - config file /usr/local/etc/motion.conf
[0] Motion 3.2.12 Started
[0] Motion going to daemon mode
[0] Exit motion, cannot create process id file (pid file) /var/run/motion/motion.pid:
First post from a very new Linux user....I am trying to create a BASH script that will allow user to provide multiple directory names, Checks if the directory exists and if not create the directory.
I am using the following code:
Which works fine as long as the user enters a single directory name. How can I modify this so it will process all directory names user enters on the read response?
1. I need help to create a interface to run software.2. The software is running at the back
View 4 Replies View RelatedWhen I add the line (sleep 5 ) & in the script then the "while read" loop does not read all lines from the file, but only prints the first line.But when I remove the ( sleep 5 ) & from the script, then the script prints all lines as defined in the file.And how to solve the problem? I want to create a new process (for which the sleep is just an example) in the while loop:
$ more test
#!/bin/ksh
while read -r line ; do
[code]....
In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab
View 4 Replies View RelatedI have a process that seems to be unexpectadly quitting. Checking the messages log I could not find anything out of the ordinary. Would anyone here know how to make a process unkillable or lock a process somehow? I read information on doing this by making a looped iso, however the process im starting requires to be able to read/write to the files in the iso so this is not going to work. For now I just niced the process to top priority but I dont really think that will work. This process is a voice server so I dont want people getting discouraged that the server will not stay up and decide not to use the free service im offering.
Would anyone else have any insight as to what I can do? Im not new to linux but im not familiar enough with how every command is used, so if at all possible please give me the commands that need to be executed.
I am playing around with RH for the first time. I have two applications which insist on using names for network ranges - so they need /etc/networks. I created one on the RH box as suggested via google but the apps still cant see the names (basically they are not reading /etc/networks). What is the correct process to create network names on RH? Basically the equivalent of solaris /etc/networks?
View 4 Replies View RelatedI have a project that I'm working on now that is using Ubuntu 8.04LTS to create a reverse SSH proxy for a telnet process. We have the box logging in with RSA keys so that it can automatically connect to the SSH host on our end. We are using autossh to keep the connection up and running.
We have rolled out 3 of these and they are working very well. We ghosted the original, changed the hostname, changed the IP info, and regenerated the SSH keys. Now I need to clone 35 more. I want to try to do this as efficiently as possible and can script the changes in the hostname, IP, ect.
Can I batch create RSA keypairs on my workstation and then copy them over as a part of the batch? My current other option is to login to each of them and generate the pair. I would like to just install the drive and ship it and not even have to boot it up.
There are two host agent process ( hprsmha -WD and RSMHA ) running on my SLES 10 server suddenly hangs which is critical for my daily scheduled backup jobs.I want to create a script which checks for the 2 process and restart it automatically.so i can put it to daily cron job.My knowledge with scripting is so poor. Following are the commands i am running manually to stop and start the process.
cd /etc/init.d
./hprmsha stop
./hprsmha_wd stop
./hprsmha_wd start
./hprsmha start
one tell me the internal working of kill command. that is how it kills a process internally or from where it picks file to continue its process.
View 3 Replies View RelatedI have a high priority service that I start with sudo nice -n -10 process. This process does not need superuser rights though, except for the priority elevation. But nice requires superuser privileges to elevate priority.
View 3 Replies View Relatedsend the details raid configuration how to use in linux el5 and how to indentify the raid degrade process and how to rebuilt the process.
View 4 Replies View RelatedCode:
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
[code]....
Description of what the code does or what i intended to do:
1. Created a child process from parent process using 'fork()'
2. Sent a signal 'SIGALRM' from child process to parent process using 'sigqueue' function.
(The Third parameter of 'siqueue' function contains the message (message msg) which the child process wants to send to the parent process.'msg' is a stucture instance containing a) pid of child and b) string) 5. Print the 'msg' sent by child process inside the signal handler function 'sig_action_function' of the parent process I am getting some junk value when this line is executed
Code:
printf("%d
",msg->cpid);
I expected to get the pid of child process, which the child process sent to parent process through the signal.
I get the error: Could not start process Unable to create io-slave: klauncher said: Unknown protocol 'magnet'.
View 3 Replies View Relatedas we all know Process Scheduler does Process scheduling and its a process as well. I was just wondering that if this happens then the Process "Process Scheduler" should be a part of Process queue as well.
So if there are 5 process are there in Process queue & process scheduler is administrating them then since its also a process, once it puts a process under RUN state it should itself go inside queue because at one instant only one process can get executed on a processor. This is quite confusing for me. Please help me out. I tried to search on this but could not find any relevant topics.
How do you find the parent process of zombie processes?
When the child process is something where the parent is not entirely obvious...
Is there some way to list processes in tree format or something?
I have a process running on Linux.When i do ps -eaf | grep <myProcess>, it show muliple entries for <myProcess> with different pids for each entry.Kindly tell me what could be the reason for a process having multiple pids?
View 1 Replies View RelatedI want ro ran new commandy after sungrid finish his task.Exp:qsub -q bla command1; command2 command2 start only when job of command1 finished.
View 9 Replies View RelatedI've been running my shellscript for about half an hour now. It's taking longer than I thought to process all the data. I have the process ID of it. Is it possible to save the process and log out then log in and continue the process? I know how to pause a process using kill -pause pID and continue it using kill -cont pID. But that only work if you don't log out after pausing it.
View 5 Replies View Relatedi want to know how to call the other file in linux. example i got this code that store into example1.sh and i want to store the data into other file like example2.
View 2 Replies View Relatedwhat is what is signal 0 in linux system call ?i can't find that in kill -l signal list . i need to know what is signal 0 . * for examples signal 1 is SIGHUP and signal 2 is SIGINIT . what is signal 0 ?
View 1 Replies View RelatedI am writing a shell script lets say run.sh and i want to call another script lets say test.sh having permissions " root:sys" whereas the permissions for run.sh are "rootther".Problem is that i cannot change the permissions of either of them. run.sh is performing some other important functions as well and test.sh is a system script and i am not supposed to change that.If i do not change the permissions, run.sh simply skips the part where it is suppose to call test.sh.Can anyone tell me how do i call test.sh in run.sh without changing permissions of any of them.
View 2 Replies View RelatedWhen I an in Emacs, I want to call info pages like in terminal. E.g., info date will call the date info page, but when I in Emacs, I can only use M-x info call the complete info pages, but I only want to see the date info page. Then which command I should execute in emacs.
View 4 Replies View RelatedI want to launch other executable from my cpp code. I am aware that system() call may do this , But, problem is that , I want my cpp code to capture the standard hat "called" program is writing to stdout.
View 2 Replies View Relatedi am trying to run an application code in nfs host.but facing the problem as shown below.can anybody tell what the problem could be?
[code]...