Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Status of child job after parent is killed
Top Forums Programming Status of child job after parent is killed Post 302123927 by porter on Wednesday 27th of June 2007 07:40:57 PM
Old 06-27-2007
Quote:
Originally Posted by blowtorch
Very specifically mentions that the process is inherited by init.
And I am suggesting inserting another process between the original parent and child, so this new process is the one that gets inherited by init instead of the original child.

This new process can then be interrogated by some IPC mechanism to determine the state of the child process, write and delete pid files etc.

So instead of

Code:
/** OLD CODE **/
pid_t child=fork();

if (!child) { exit(run_child()); }

you do

Code:
/** NEW CODE **/
pid_t surrogate=fork();

    if (!surrogate)
    {
        pid_t child=fork();
        if (!child) { exit(run_child()); }
        ... do stuff to monitor child and perform IPC until told to die ... 
        exit(0);
    }

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

what are parent and child processes all about?

I don't follow what these are... this is what my text says... "When a process is started, a duplicate of that process is created. This new process is called the child and the process that created it is called the parent. The child process then replaces the copy for the code the parent... (1 Reply)
Discussion started by: xyyz
1 Replies

2. Filesystems, Disks and Memory

How hard can it be? ps child/parent

:( Since I'm fairly new to the scene and don't have much experience in shell programming, I decided to check out the net for a useful script or two. What I'm looking for is a script that would let me enter a PID and then show the process tree associated with it. So it would display the (grand-)... (2 Replies)
Discussion started by: velde046
2 Replies

3. UNIX for Dummies Questions & Answers

kill parent and child

Hello all, I have gone through the search and looked at posting about idle users and killing processes. Here is my question I would like to kill an idle user ( which I can do) but how can I asure that all of his process is also killed whit out tracing his inital start PID. I have tried this on a... (4 Replies)
Discussion started by: larry
4 Replies

4. Shell Programming and Scripting

Parent/Child Processes

Hello. I have a global function name func1() that I am sourcing in from script A. I call the function from script B. Is there a way to find out which script called func1() dynamically so that the func1() can report it in the event there are errors? Thanks (2 Replies)
Discussion started by: yoi2hot4ya
2 Replies

5. UNIX for Dummies Questions & Answers

Who is the parent of a killed process ?

Suppose we have the following process tree: init-> ProcessA->processB->processC then I kill processB Who is the parent of the processC? init or the processA (6 Replies)
Discussion started by: Puntino
6 Replies

6. UNIX for Advanced & Expert Users

Child Killing Parent

Hi all, I am writing a script which calls other third party scripts that perform numerous actions. I have no control over these scripts. My problem is, one of these scripts seems to execute and do what it is meant to do, but my calling / parent script always exits at that point. I need to... (4 Replies)
Discussion started by: mark007
4 Replies

7. Shell Programming and Scripting

Running at command - Parent script getting killed

I have a script that calls another script within it that takes about 1 hour to execute. I am noticing that the parent script that calls the child script is getting killed. Does anyone know why? The child script still runs. (3 Replies)
Discussion started by: 3junior
3 Replies

8. Homework & Coursework Questions

Need help with deleting childīs parent and child subprocess

1. The problem statement, all variables and given/known data: I need to make an program that in a loop creates one parent and five children with fork(). The problem i'm trying to solve is how to delete the parent and child of the childīs process. 2. Relevant commands, code, scripts,... (0 Replies)
Discussion started by: WhiteFace
0 Replies

9. Shell Programming and Scripting

forking a child process and kill its parent to show that child process has init() as its parent

Hi everyone i am very new to linux , working on bash shell. I am trying to solve the given problem 1. Create a process and then create children using fork 2. Check the Status of the application for successful running. 3. Kill all the process(threads) except parent and first child... (2 Replies)
Discussion started by: vizz_k
2 Replies

10. Shell Programming and Scripting

Propagate exist status from a child shell script to a parent.

Hi All, I have a parent shell script A and a child shell script B. 1). If a command i.e a mysqdump fails in shell script B fails then I trap the error with this code if ] then func_exit "Failed to export the cleaned DB1.${MYDBNAME} database to the ${MYARCHIVEDIR} directory"... (1 Reply)
Discussion started by: daveu7
1 Replies

LEARN ABOUT OPENSOLARIS

setpgid

setpgid(2)							   System Calls 							setpgid(2)

NAME

       setpgid - set process group ID

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       int setpgid(pid_t pid, pid_t pgid);

DESCRIPTION

       The setpgid() function sets the process group ID of the process with ID pid to pgid.

       If pgid is equal to pid, the process becomes a process group leader. See Intro(2) for more information on session leaders and process group
       leaders.

       If pgid is not equal to pid, the process becomes a member of an existing process group.

       If pid is equal to 0, the process ID of the calling process is used. If pgid is equal to 0, the process specified by pid becomes a  process
       group leader.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The setpgid() function will fail if:

       EACCES	 The pid argument matches the process ID of a child process of the calling process and the child process has successfully executed
		 one of the exec family of functions (see exec(2)).

       EINVAL	 The pgid argument is less than (pid_t) 0 or greater than or equal to PID_MAX, or the calling process has a  controlling  terminal
		 that does not support job control.

       EPERM	 The process indicated by the pid argument is a session leader.

       EPERM	 The  pid  argument matches the process ID of a child process of the calling process and the child process is not in the same ses-
		 sion as the calling process.

       EPERM	 The pgid argument does not match the process ID of the process indicated by the pid argument, and there  is  no  process  with  a
		 process group ID that matches pgid in the same session as the calling process.

       ESRCH	 The pid argument does not match the process ID of the calling process or of a child process of the calling process.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(2), exec(2), exit(2), fork(2), getpid(2), getsid(2), attributes(5), standards(5)

SunOS 5.11							    28 Dec 1996 							setpgid(2)
All times are GMT -4. The time now is 03:36 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy