My question is, how do you fork only the parent processes in unix? For example how would I use the fork function to fork the parent process more than once and leave the children processes alone.
That's what fork()'s return value is for. children will know they are children.
Code:
pid_t pid=fork();
if(pid > 0)
{
fprintf(stderr, "I am in the parent\n");
}
else if(pid == 0)
{
fprintf(stderr, "I am the child so should not fork again\n");
}
else
{
perror("could not fork");
}
When I compile this C programme I get different outputs each time I run it
Please explain to me whats happening in the code if you can give me a detailed explanation. Because I am stuck with this.
#include <stdio.h>
main(){
int i = 0;
printf("I am the... (1 Reply)
When I compile this C programme I get different outputs each time I run it
Please explain to me whats happening in the code if you can give me a detailed explanation with the schedular functionality it will help a lot. Because I am stuck with this.
#include <stdio.h>
main(){... (3 Replies)
Hi everybody,
I'm having some problems wiriting a program in UNIX using the "fork" and "kill" system calls.
I have to create a C program P0, which creates 9 other processes
P1, P2, ..., P9, where P0 is the father of P1, P1 the father of P2, and so on.
All the processes contain an infinite... (0 Replies)
Hi
I'm currently working with C on UNIX (HPUX) and need to be able to fork a seperate Java process from within a running C process.
I can run the following code from the command line via a script but am having difficulty getting it to work from within the code.
I am trying to use execl. Is... (4 Replies)
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main()
{
pid_t pID;
int i;
for (i = 0; i < 3; i++)
{
pID = fork ();
if (pID == 0)
{
printf ("Value of i --> %d... (2 Replies)
hi experts(novice people can stay away as it is no child's game),
i am developing a script which works like recycle bin of windows.
the problem i am facing is that when ever i am trying to delete a file which is situated in parent directory or parent's parent directory i am unable to... (1 Reply)
hi,
I want my program to fork a new process and then I want to kill the parent process. The parent program before dying will issue a SIGTERM to all its childs. Which eventually kills all Children.
I cant handle the SIGTERM at the child level.:(
What I was thinking of was the Parent... (3 Replies)
Keep in mind that I haven't done Perl scripting for a LONG time, so I'm quite rusty.
This is what I would like to do:
- using fork, create 3 or 4 processes to read 3 or 4 different text documents containing server names or IP addresses
- in each of those processes, Perl will ping each of those... (7 Replies)
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)
I have an input file with contents like:
5785690|68690|898809
7960789|89709|789789
7669900|87865|659708
7869098|65769|347658
so on..
I need to pass this file to 10 parallely running processes (forking)so that each line is processed by a process and no line is processed twice and write the... (1 Reply)
Discussion started by: rkrish
1 Replies
LEARN ABOUT HPUX
ptree
ptree(1) General Commands Manual ptree(1)NAME
ptree - prints the process tree hierarchy
SYNOPSIS
[pid1|username1 [pid2|username2]...]
DESCRIPTION
prints the process tree of all processes that match the specified arguments. While printing the tree, the child processes are indented to
the right from their respective parent processes.
Options
Prints the tree starting from the children of
(usually pid 0). The default is to print the tree starting from the children of (pid 1).
Operands
pid Print the process tree for the process ID number specified by pid.
username Print the process tree for all the processes from the user specified by username. Note that only username (and not user ID) can
be specified for this instance.
If no operands are specified, then prints the process tree of all processes starting from the children of or (if is specified).
EXTERNAL INFLUENCES
Environment Variables
If is not specified or is null, it defaults to (see lang(5)).
EXAMPLES
Print the process tree for pid 100 and for all processes owned by
WARNINGS
Process information can change while is running; the tree displayed by is only a snapshot in time. Some data printed for defunct processes
is irrelevant.
Users of must not rely on the exact field widths and spacing of its output, as these will vary depending on the system and the release of
HP-UX.
SEE ALSO pgrep(1), pkill(1), ps(1), fork(2).
ptree(1)