10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
What is the overhead associated with zombie process?Is it running out of process-ID?:confused:
Since some information is stored in process table..
Thanks in Advance (4 Replies)
Discussion started by: jois
4 Replies
2. AIX
Is there an equivilant to the preap command in AIX that would allow me to get rid of a zombie process. I am new to AIX, moving over from Solaris and in the past I have been able to preap the pid on the defunct process to clean them up. I have looked around and the best I can see is that it may... (3 Replies)
Discussion started by: sboots
3 Replies
3. Solaris
dear friends,
in an interview they asked me what is zombie process. how we can identifying these process.if can you kill all zombie process. (8 Replies)
Discussion started by: sijocg
8 Replies
4. Shell Programming and Scripting
Hi
I need help because I don't know if it is possible to add a find inside a cat.
like I have a file with the pid of the process that use to became zombie. And I have the same pid stored in the var (pid1)
now, I have no clue how to check if the the find finds the pid or even if it's... (2 Replies)
Discussion started by: ruben.rodrigues
2 Replies
5. Linux
Hi
What is the command to find only the zombie processes??
How to write the code in C to fetch the no. of zombie processes??
Thanx (5 Replies)
Discussion started by: jeenat
5 Replies
6. Shell Programming and Scripting
Is there a way I can run a command that will run in the kernel or in the memory and automatically kill certain scripts if they get to <defunct> processes, without having to be monitoring the server manually?
I have a Perl script which runs for 20k members and normally does not have any problems,... (2 Replies)
Discussion started by: ukndoit
2 Replies
7. Programming
main()
{
pid_t child;
child=fork();
if(child > 0)
{sleep(60);
}
else
{exit(0);
}
}
the above code will create zombie process,which will be adopted by init as soon as parent process will dies.Can any one gimme a code or an alogrithm to keep this zombie proocess alive even after... (6 Replies)
Discussion started by: anilchowdhury
6 Replies
8. Programming
hi
i m writin a program in which i keep track of all the child processes the program has generated and if a child process has an abnormal termination i need to do certain task related to that child process.
for handlin child process i used waitpid:
temp_cpid=waitpid(-1,&stat,WUNTRACED);
... (4 Replies)
Discussion started by: mridula
4 Replies
9. UNIX for Advanced & Expert Users
I would like to create a zombie process so that I can test monitoring software functionality. Any techniques? (2 Replies)
Discussion started by: swhitney
2 Replies
10. UNIX for Dummies Questions & Answers
How do i kill a zombie process. Is it that only root can kill a zombie process. (8 Replies)
Discussion started by: orca
8 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)