11-19-2008
alright....thanks! i got it
10 More Discussions You Might Find Interesting
1. Programming
When executing this simple program:
#include <unistd.h>
void main()
{
int f;
printf("\n Parent procces ID=%d\n",getpid());
f=fork();
if(f==0)
{
printf("\n Child process ID=%d father=%d\n",getpid(),getppid());
}
... (2 Replies)
Discussion started by: bb666
2 Replies
2. Programming
Hi,
I have written a code which will run a set of process using
fork.
I want to know from You how can i start another job when one of my job in my loop is completed
My code is
#include<stdio.h>
#include<ctype.h>
main() {
int pid,cid;
ChildProcess();
... (1 Reply)
Discussion started by: sureshraju_ma
1 Replies
3. UNIX for Advanced & Expert Users
hi everybody,
what mission critical workloads and applications functions can run on the UNIX operating system?
best regards (5 Replies)
Discussion started by: styfo
5 Replies
4. Programming
Hello experts,
I am using fork() in my code but I am confused which output comes first child or parent?
I did the following code .My book shows parent first but my linux shows child first.Can anyone tell me why?
#include <stdio.h>
int main(){
int pid;
printf("I am original process with pid... (5 Replies)
Discussion started by: mlhazan
5 Replies
5. High Performance Computing
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)
Discussion started by: Advice Pro
1 Replies
6. Programming
Hi everyone:
I'm developing a dynamic library for notifications, this library is used for a daemon that i've programmed, when something goes wrong the library should send an email to an administrator, but since sending an email is a non-vital process then it can fail (it should work as an... (4 Replies)
Discussion started by: edgarvm
4 Replies
7. Programming
I writing a program that forks three times but only on the parent process. The three children processes then produces output in order. 1, 2, 3. I am confused on how to do this. I have tried multiple if and else if statements but the output does not come out right. How should I go about doing this? (1 Reply)
Discussion started by: TWhitt24
1 Replies
8. Programming
Hello everybody.I want to make clear that i am not going to ask from anybody to build my asignement but i have a big problem. I can't seem to find anywhere ONE good example on C about what i am trying to do:wall:.I think it is simple. All i ask is one example, even a link is fine.
So, i want to... (1 Reply)
Discussion started by: Cuervo
1 Replies
9. Programming
i'm experimenting fork function and i found this code
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <wait.h>
#include <fcntl.h>
#include <unistd.h>
int main(void)
{
int fd;
pid_t p;
p = fork();
fork();
if (p>0) { fork();}
fork();
fork();... (6 Replies)
Discussion started by: blob84
6 Replies
10. Programming
Hi All,
I have a program for class that needs to do the following:
1. Print the directory entries from the current directory using ncurses
2. Provide a prompt next to each directory entry and allow the user to enter commands that may or may not be about the file
3. Execute those commands in... (1 Reply)
Discussion started by: afulldevnull
1 Replies
VFORK(2) System Calls Manual VFORK(2)
NAME
vfork - spawn new process in a virtual memory efficient way
SYNOPSIS
pid = vfork()
int pid;
DESCRIPTION
Vfork can be used to create new processes without fully copying the address space of the old process, which is horrendously inefficient in
a paged environment. It is useful when the purpose of fork(2) would have been to create a new system context for an execve. Vfork differs
from fork in that the child borrows the parent's memory and thread of control until a call to execve(2) or an exit (either by a call to
exit(2) or abnormally.) The parent process is suspended while the child is using its resources.
Vfork returns 0 in the child's context and (later) the pid of the child in the parent's context.
Vfork can normally be used just like fork. It does not work, however, to return while running in the childs context from the procedure
that called vfork since the eventual return from vfork would then return to a no longer existent stack frame. Be careful, also, to call
_exit rather than exit if you can't execve, since exit will flush and close standard I/O channels, and thereby mess up the parent processes
standard I/O data structures. (Even with fork it is wrong to call exit since buffered data would then be flushed twice.)
SEE ALSO
fork(2), execve(2), sigvec(2), wait(2),
DIAGNOSTICS
Same as for fork.
BUGS
This system call will be eliminated when proper system sharing mechanisms are implemented. Users should not depend on the memory sharing
semantics of vfork as it will, in that case, be made synonymous to fork.
To avoid a possible deadlock situation, processes that are children in the middle of a vfork are never sent SIGTTOU or SIGTTIN signals;
rather, output or ioctls are allowed and input attempts result in an end-of-file indication.
4th Berkeley Distribution June 30, 1985 VFORK(2)