Unix Interview Questions and Answers


What is a zombie?

When a program forks and the child finishes before the parent, the kernel still
keeps some of its information about the child in case the parent might need it -
for example, the parent may need to check the child's exit status. To be able
to get this information, the parent calls `wait()'; In the interval between
the child terminating and the parent calling `wait()', the child is said to
be a `zombie' (If you do `ps', the child will have a `Z' in its status
field to indicate this.)

Posted by:Richards