Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Running process in the background
Top Forums UNIX for Beginners Questions & Answers Running process in the background Post 303015677 by uniran on Tuesday 10th of April 2018 06:28:01 AM
Old 04-10-2018
Running process in the background
Hi,

I have this simple c program that creates duplicate process with fork():

Code:
#include <sys/types.h>
main()
{
if (fork() == 0)
while(1);
else
while(1);
}

I tried running it in the background

Code:
gcc -o test first.c
test &

And I got this list of running process:

Code:
ps -l
F S   UID    PID   PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S  1000  46202  46194  0  80   0 -  5782 wait   pts/0    00:00:01 bash
0 T  1000  47701  46202  0  80   0 -  1998 signal pts/0    00:00:00 awk
0 T  1000  47702  46202  0  80   0 -  1998 signal pts/0    00:00:00 awk
0 R  1000  54295  46202  0  80   0 -  8370 -      pts/0    00:00:00 ps
[3]   Exit 1                  test

Why can`t I see the PID of the two process (father and son) created with the fork() ?
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

running process in background

I'm trying to install a solaris 9 patch cluster and when I try to use & to run in background it won't allow me to enter in my sudo password so it fails the install and sudo auth. Does Solaris not have screen like linux? If & will work what am I doing wrong? sudo ./install_cluster -q & is... (3 Replies)
Discussion started by: kingdbag
3 Replies

2. Solaris

how to capture oracle export log while running as background process

I ran the Oracle 9i export command from a terminal to export out a big table using "exp andrew/password file=andrew.dmp log=andrew.log" From the terminal I can see that the export is running as there is some output from the oracle export job. The export job is not complete yet. When i go check... (4 Replies)
Discussion started by: hippo2020
4 Replies

3. Shell Programming and Scripting

How to know the status of process running in background

I have run one shell script in background that contains a endless while loop. I am not able to know the status of that job . Please provide any command to know this. I have already used "ps -aef" , "jobs" to know it , but it didn't work. I am sure the process is running as it is generating a file... (8 Replies)
Discussion started by: sumanta
8 Replies

4. UNIX for Advanced & Expert Users

make a foreground running process to run background without hang up

I've tried this a long time ago and was successful but could not remember how i did it. Tried ctrl+Z and then used bg % could not figure what i did after to keep it no hangup - not sure if used nohup -p pid, can u plz help me out if this can be done. Any help will be appreciated. (12 Replies)
Discussion started by: pharos467
12 Replies

5. Shell Programming and Scripting

How to export a variable from a child process running in background to the parent

Hi All, I have a script which calls a child script with a parameter to be run in the background . childscript.ksh $a & Can any one suggest me how do i export a variable from the child script to parent script? Note that the child script is in background If the child script is in... (3 Replies)
Discussion started by: aixjadoo
3 Replies

6. UNIX for Advanced & Expert Users

send a new value to a variable in a running background process

Hi guys, I have a issue with a background process, I need to update the value of a variable in that process which is running at this time and it will be running for at least 2 days. Any idea? I will apreciate your help. regards. Razziel. (2 Replies)
Discussion started by: razziel
2 Replies

7. Shell Programming and Scripting

command to see process running at background

Hi , I want to see all the background process that are running in unix box machine...please guide me is there any specific command for that..since I am executing some scripts at background..!!:confused: (1 Reply)
Discussion started by: nks342
1 Replies

8. Shell Programming and Scripting

Running Shell Script in the cron, background process

Hi, i was looking for an answer for some trouble im having runing a script in the cron, thing is, that when i run it manually it works just fine. But when cron runs it, it just doenst work. I saw a reply on a similar subject, suggesting that the . .profile worked for you, but im kind of... (9 Replies)
Discussion started by: blacksteel1988
9 Replies

9. UNIX for Advanced & Expert Users

Issue with tracking successful completion of Child process running in background

Hello All, I am using Linux. I have two scripts: inner_script.ksh main_wrapper_calling_inner.ksh Below is the code snippet of the main_wrapper_calling_inner.ksh: #!/bin/ksh ppids=() ---> Main array for process ids. fppids=() ---> array to capture failed process ids. pcnt=0 --->... (5 Replies)
Discussion started by: dmukherjee
5 Replies

10. Shell Programming and Scripting

How to return from background process and check if it is running or not?

Hi Team, i am executing 3 scripts in background from 1 script and i want to send a message once the script gets completed.these scripts usually takes 1 hr to complete. My sample script is below, Vi abc.sh sh /opt/data/Split_1.sh & sh /opt/data/Split_2.sh & sh /opt/data/Split_3.sh & ... (3 Replies)
Discussion started by: raju2016
3 Replies

LEARN ABOUT PHP

pts_quit

PTS_QUIT(1)						       AFS Command Reference						       PTS_QUIT(1)

NAME

       pts_quit - Exit from pts interactive mode

SYNOPSIS

       pts quit [-cell] <cell name> [-noauth] [-localauth]
	   [-force]

       pts q [-c] <cell name> [-n] [-l] [-f]

DESCRIPTION

       The pts quit command exits from pts interactive mode.  The command can be run from the command line or interactively, but on the command
       line it does nothing and is therefore of questionable utility.

CAUTIONS

       Prior to OpenAFS 1.4.5 and OpenAFS 1.5.23, the pts quit command was only available on Unix or Linux and when OpenAFS was compiled with the
       supergroups option (disabled by default).  As of OpenAFS 1.4.5 and 1.5.23, it is always available.

OPTIONS

       Although they have no effect, pts quit takes the following standard pts options:

       -cell <cell name>
	   Names the cell in which to run the command. For more details, see pts(1).

       -force
	   Enables the command to continue executing as far as possible when errors or other problems occur, rather than halting execution at the
	   first error.

       -help
	   Prints the online help for this command. All other valid options are ignored.

       -localauth
	   Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. Do not combine this flag with the -cell or
	   -noauth options. For more details, see pts(1).

       -noauth
	   Assigns the unprivileged identity anonymous to the issuer. For more details, see pts(1).

OUTPUT

       This command produces no output.

EXAMPLES

       Here is an example of a pts interactive session:

	  % pts interactive
	  pts> quit
	  %

SEE ALSO

       pts(1), pts_interactive(1)

COPYRIGHT

       Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com>

       This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for
       OpenAFS.

OpenAFS 							    2014-04-08							       PTS_QUIT(1)
All times are GMT -4. The time now is 06:58 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy