I have tried to fix as many as issues I can that has been pointed out by @alister. In this version of the reminder program the parent will exit after fork. The pid of the child that calls the xterm is written into a file which is used to kill the child when needed. And the best thing I got no warnings!! Happly with that
Now I will try and implement the second approach in which I put the process in background and try to kill the child using it. i have no idea how I am going to do that. First off I will just try to make the parent a background process. Will figure out the rest along the way.
If I want to write program that spread the work to its child process so that each process compute some task what should I do?
The objective of my program is to fill in the table which (10*10) in dimension and each column is filled with the fibonacci value of i+j (i mean current row and j mean... (1 Reply)
Dear Experts
Why we always hear that unix operating system is Multi User and Multi task. What does these two means. I have looked at some books and documents but couldn't find aclear explenation. Can we say Windows operating system is also multi user and multi task??
Thanks for your help in... (6 Replies)
Hi,
Am supposed to use message queues to send and receive messages between the processes. when i was working on that i realised that the message qid and the message queue related data should be maintained in a shared memory so that it can be accessed by all the processes. Could anybody refer... (10 Replies)
Hi,
I'm trying to compile the following code:
/************** Begin <test.c> ***************/
/*
* Compiled with: gcc -Wall -o test test.c
*/
#include <stdio.h>
#include <unistd.h>
int main(void)
{
printf("I'm process %d, son of %d \n", getpid(), getppid());
printf("Hello \n");... (3 Replies)
Hi,
I'm trying to compile the following code:
/************** Begin <test.c> ***************/
/*
* Compiled with: gcc -Wall -o test test.c
*/
#include <stdio.h>
#include <unistd.h>
int main(void)
{
printf("I'm process %d, son of %d \n", getpid(), getppid());
... (5 Replies)
I read that 'Any single program that can run as multiple processes can benefit from OpenMosix: "The GIMP" photo editor and the "kandel" fractal generator are known to do this.
Are there other load-balancing clusters that do support multi-process applications? (1 Reply)
I have a unix directory where a million of small text files getting accumulated every week.
As of now there is a shell batch program in place which merges all the files in this directory into a single file and ftp to other system.
Previously the volume of the files would be around 1 lakh... (2 Replies)
Hi,
I have a problem where I need to make this input:
nameRow1a,text1a,text2a,floatValue1a,FloatValue2a,...,floatValue140a
nameRow1b,text1b,text2b,floatValue1b,FloatValue2b,...,floatValue140b
look like this output:
nameRow1a,text1b,text2a,(floatValue1a - floatValue1b),(floatValue2a -... (4 Replies)
I am trying to write a large X app. I have successfully modified my xorg.conf to setup 4 monitors on an NVIDIA Quatro5200. I am trying to modify a simple hello world application to open a window on three of the four monitors. depending on the changes to loop the window creation section and event... (2 Replies)
hi
I want to call a lot of links with the post method
What to do to speed it up??
####This method is slow
#!/bin/bash
func2() {
index1=0
while read line ; do
index1=$(($index1+1))
url=$line
done < tmp/url1.txt
} (10 Replies)
Discussion started by: mnnn
10 Replies
LEARN ABOUT ULTRIX
fork
fork(2) System Calls Manual fork(2)Name
fork - create a new process
Syntax
#include <sys/types.h>
#include <unistd.h>
pid = fork()
pid_t pid;
Description
The system call causes creation of a new process. The new process (child process) is an exact copy of the calling process except for the
following:
o The child process has a unique process ID.
o The child process has a different parent process ID (that is, the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for
instance, file pointers in file objects are shared between the child and the parent, so that a on a descriptor in the child process
can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish standard input
and output for newly created processes as well as to set up pipes.
o The child processes resource utilizations are set to 0. For further information, see
Return Values
Upon successful completion, returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
Diagnostics
The system call fails and no child process are created under the following conditions:
[EAGAIN] The system-imposed limit {PROC_MAX} on the total number of processes under execution would be exceeded.
[EAGAIN] The system-imposed limit {CHILD_MAX} on the total number of processes under execution by a single user would be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
See Alsoexecve(2), wait(2)fork(2)