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1. UNIX for Beginners Questions & Answers
The task I have to do is something along the lines "I receive some input and based on the first character I send it through pipe to one of the children to print".
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2. UNIX for Dummies Questions & Answers
We have a program source C and is required to indicate how many times each function is called from the C program. also print the line number where there is a call.
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3. UNIX for Advanced & Expert Users
Hi Experts,
I have a code like this.
=====
#include....
int main()
{
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4. Programming
Hi friends,
I have a small question regarding unix system call fork, I hope you will solve my problem. Here is the small program
$ cat fork1.c
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
int pid;
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x = x + 1;
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5. Programming
Hello,
i'm trying to implement the times() function and i'm programming in C.
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6. Programming
Assume you have such a piece of (more or less pseudo-)code:
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7. UNIX for Advanced & Expert Users
Hi, as I understand fork(), it makes a copy of the parent which becomes a child. But is there anyway to make three children for that one parent. So in other words, if I look up the getppid() of the children, I want them to have the same value??
Thanks in advance to any help! (1 Reply)
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8. Shell Programming and Scripting
hi experts(novice people can stay away as it is no child's game),
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9. Programming
Hello, I'm trying to implement a version of a bucketSort (kinda) server/client, but I'm having a VERY hard time on making the server behave correctly, when talking to the children, after it forks.
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Discussion started by: Zarnick
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10. Programming
Hi , Could you tell me if I am right
1. Using fork(), pipe(), execlp() and dup() (see man 2 dup), write a C program executing the command ps -j in a parent process, displaying the result in a child process.
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
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pthread_atfork(3T) pthread_atfork(3T)
NAME
pthread_atfork() - register fork handlers.
SYNOPSIS
PARAMETERS
prepare This function is called before performing the
parent This function is called in the parent process after performing the
child This function is called in the child process after performing the
DESCRIPTION
The function allows an application to install fork handlers. These fork handlers will be called before and after a operation. These han-
dlers will be called in the context of the thread calling Similar to the handlers, the application does not need to do anything special for
these fork handlers to be called. They will be invoked by the system when a operation occurs.
The function is called before the operation in the parent process. The function is called after the operation in the parent process. The
function is called after the operation in the child process.
If a fork handler is not needed in one or more of these three places, the appropriate fork handler parameter may be set to NULL.
A process may install multiple fork handling functions. The and fork handlers will be called in the order in which they were installed
(i.e., The fork handlers will be called in the opposite order (i.e.,
RETURN VALUE
Upon successful completion, returns zero. Otherwise, an error number is returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the function returns the corresponding error number:
[ENOMEM] There is insufficient table space to install the fork handlers.
AUTHOR
was derived from the IEEE POSIX P1003.1c standard.
SEE ALSO
fork(2), atexit(3).
STANDARDS CONFORMANCE
Pthread Library pthread_atfork(3T)