10 More Discussions You Might Find Interesting
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".
The scheme it is based on is 1->2; 1->3; 1->4; 2 will print all the input that starts with a letter, 3 will print all the input that... (2 Replies)
Discussion started by: Ildiko
2 Replies
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.
I've tried something like this:
#!/bin/sh
for i in $*;do
if !
then
echo $i is not a C file.
else echo $i... (0 Replies)
Discussion started by: oana06
0 Replies
3. UNIX for Advanced & Expert Users
Hi Experts,
I have a code like this.
=====
#include....
int main()
{
int count = 0;
while(1){
printf("\n Interation number is: %d \n ",count);
rv = system(" test.sh > log.txt " );
if (-1 == rv)
{
printf("Could not generate static log: error... (12 Replies)
Discussion started by: binnyjeshan
12 Replies
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;
int x = 0;
x = x + 1;
pid = fork();
if(pid < 0)
{... (2 Replies)
Discussion started by: gabam
2 Replies
5. Programming
Hello,
i'm trying to implement the times() function and i'm programming in C.
I'm using the "struct tms" structure which consists of the fields:
The tms_utime structure member is the CPU time charged for the execution of user instructions of the calling process.
The tms_stime structure... (1 Reply)
Discussion started by: g_p
1 Replies
6. Programming
Assume you have such a piece of (more or less pseudo-)code:
if(fork() == 0) {// childprocess
chmod(someProgram, 00777);
exec(someProgram);
} else { // assume it never fails and this is the parent
chmod(someProgram, 00000); // should be executed as soon as possible after the... (5 Replies)
Discussion started by: disaster
5 Replies
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)
Discussion started by: MS_CC
1 Replies
8. Shell Programming and Scripting
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)
Discussion started by: yahoo!
1 Replies
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.
The server is kinda big (300+ lines), so I won't post it here, but here's what I'm doing.
1)create a... (8 Replies)
Discussion started by: Zarnick
8 Replies
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>
#include <unistd.h>... (7 Replies)
Discussion started by: remid1985
7 Replies
PTHREAD_ATFORK(3) BSD Library Functions Manual PTHREAD_ATFORK(3)
NAME
pthread_atfork -- register handlers to be called before and after fork()
SYNOPSIS
#include <pthread.h>
int
pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));
DESCRIPTION
The pthread_atfork() function is used to register functions to be called before and after fork(). The prepare handler is called before
fork(), while the parent and child handlers are called after fork() in the parent and child process respectively. The prepare handlers are
called in reverse order of their registration, while parent and child handlers are called in the order in which they were registered. Any of
the handlers may be NULL.
Important: only async-signal-safe functions are allowed on the child side of fork(). See sigaction(2) for details.
RETURN VALUES
If successful, the pthread_atfork() function will return zero; otherwise an error number will be returned to indicate the error.
ERRORS
pthread_atfork() will fail if:
[ENOMEM] The system lacked the necessary resources to add another handler to the list.
SEE ALSO
fork(2)
STANDARDS
pthread_atfork() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD
August 12, 2004 BSD