05-10-2009
first understand what fork returns to parent and child, then everything will automatically come to you...
fork
10 More Discussions You Might Find Interesting
1. Programming
Hello,
First let me start by saying I have searched the forum and read all the SUID stuff but it is not in the neighborhood I am looking for.
Here is the problem. We want to grant a non super-user permission to kill root processes but only if the process matches certain criteria. ... (8 Replies)
Discussion started by: TioTony
8 Replies
2. Programming
As far as I can tell, the bash wait command waits for a logical "AND" of all the child processes.
Assuming I am coding in C:
(1) What is the function I would use to create multiple bash child process running perl?
(2) What is the function I would use to reinvent the bash wait command so I... (4 Replies)
Discussion started by: siegfried
4 Replies
3. Programming
Hey,
I am doing a high availability project. I need coding(socket programming using C) to monitor processes that are running in different nodes with in a network cluster.At last if u could give me a program in C to monitor the process(whether it is running or failed),it would be very... (2 Replies)
Discussion started by: vigneshinbox
2 Replies
4. Shell Programming and Scripting
Hi,
I am new this forum. I request you peoples help in understanding and finding some solution to my problem.
Here it goes:
I need to perform this set of actions by writing a shell script. I need to read a config file for the bunch of processes to execute.
I need to fecth the pid of... (4 Replies)
Discussion started by: sachin4sachi
4 Replies
5. UNIX for Dummies Questions & Answers
I've been working on some scripts in which I spawn some background processes. I'd like to be able to limit the number of processes, but have my script spawn additional processes as previous tasks finish. So, let's say I have 20 tasks to complete. Any given task could take from 1 to 10 minutes. ... (7 Replies)
Discussion started by: treesloth
7 Replies
6. Programming
Hello. This shouldn't be an unusual problem, but I cannot find anything about it at google or at other search machine.
So, I've made an application using C++ and QtCreator. I 've made a new mime type for application's project files.
My system (ubuntu 10.10), when I right click a file and I... (3 Replies)
Discussion started by: hakermania
3 Replies
7. Homework & Coursework Questions
I need help program in C... :create a program that runs two processes linked oven (1 Reply)
Discussion started by: gizmo16
1 Replies
8. Shell Programming and Scripting
:)Hi there, I am new to scripting and wanted to see if someone can show me how to grep on multiple processes and send the output to a file in /home/mydir/output.
I am aware of
ps -ef | grep on 1 process
but need help looking up multiple processes, can you use this command
ps -elf | grep |pid1... (4 Replies)
Discussion started by: abbya
4 Replies
9. Shell Programming and Scripting
Hi,
I have three files in my IN directory.Each file should be copied 25 times using for loop.Each file processing should run in parallel?How to spawn multiple processes in unix?Any help would be appreciated.
Thanks,
Liyakath (7 Replies)
Discussion started by: liyakathali
7 Replies
10. Shell Programming and Scripting
I am doing some file manipulation and then a bcp once all the files are processed. I need to do the following
for all files in dirctory
begin
-Step 1 use another shell/perl to format the file
done
in the end load into db using bcp
I want to do step 1 and step in a seperate... (2 Replies)
Discussion started by: tasmac
2 Replies
LEARN ABOUT BSD
pthread_atfork
PTHREAD_ATFORK(3) Library Functions Manual PTHREAD_ATFORK(3)
NAME
pthread_atfork - register handlers to be called at fork(2) time
SYNOPSIS
#include <pthread.h>
int pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));
DESCRIPTION
pthread_atfork registers handler functions to be called just before and just after a new process is created with fork(2). The prepare han-
dler will be called from the parent process, just before the new process is created. The parent handler will be called from the parent
process, just before fork(2) returns. The child handler will be called from the child process, just before fork(2) returns.
One or several of the three handlers prepare, parent and child can be given as NULL, meaning that no handler needs to be called at the cor-
responding point.
pthread_atfork can be called several times to install several sets of handlers. At fork(2) time, the prepare handlers are called in LIFO
order (last added with pthread_atfork, first called before fork), while the parent and child handlers are called in FIFO order (first
added, first called).
To understand the purpose of pthread_atfork, recall that fork(2) duplicates the whole memory space, including mutexes in their current
locking state, but only the calling thread: other threads are not running in the child process. The mutexes are not usable after the fork
and must be initialized with pthread_mutex_init in the child process. This is a limitation of the current implementation and might or
might not be present in future versions.
RETURN VALUE
pthread_atfork returns 0 on success and a non-zero error code on error.
ERRORS
ENOMEM insufficient memory available to register the handlers.
AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr>
SEE ALSO
fork(2), pthread_mutex_lock(3), pthread_mutex_unlock(3).
LinuxThreads PTHREAD_ATFORK(3)