How can a parent and child process communicate?
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Answer / yogesh warad
Parent and child processes can communicate with unnamed pipe,
but the pipe should be created before creating the
child(i.e. forking).
After forking the process, child process inherits all
properties of parent, hence pipe also. This pipe can ce used
to communicate between parent and child process. But if one
wants to use exec(s), then this technique is not useful. The
user have to use named pipe or Message-Queue.
| Is This Answer Correct ? | 35 Yes | 7 No |
Answer / basha
this is called copy on write concept
===================================
when ever an environment variable is modified for the
first time either by the parent process or by the child
process a copy of the variable is given to the child
process. the process which modifies the value will see the
modified value. the other process will see the value
obefore modification.
export statement makes a variable as environment
variable ,visible to child
| Is This Answer Correct ? | 1 Yes | 10 No |
Answer / sanjay
An Application programming interface (API) is a source code
interface that an operating system or library provides to
support requests for services to be made of it by computer
programs. Advanced programming interface is a near synonym
with wider application that predates the current common
usage. In the original term the concept is meant to
represent any well defined interface between two separate
programs. The main difference is that this older term does
not inculcate a parent-child relationship and can therefore
be applied to peer-to-peer situations more logically, e.g.
internal kernel services which can present themselves as
separate programs.
| Is This Answer Correct ? | 2 Yes | 15 No |
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