It is perfectly permissible to use a pre-existing, already-opened file descriptor number as the target of dup2 (). In this event, dup2 () will close the target,then re-open it as a copy of the source file descriptor.TrueO False Which of the following is true about the exec1 () function call?The calling process can no longer be waited on by its parentO If successful, exec1 will not returnexec1 cannot return a value of -1 due to it's pid_t return typeexecl returns the exit status of a program via an integer pointer

The solution for both the questions are given below with explanation

It is perfectly permissible to use a pre-existing, already-opened file descriptor number as the target of dup2 (). In this event, dup2 () will close the target, then re-open it as a copy of the source file descriptor. True O False

It is perfectly permissible to use a pre-existing, already-opened file descriptor number as the target of dup2 (). In this event, dup2 () will close the target, then re-open it as a copy of the source file descriptor. True O False

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter10: Pointers

Section: Chapter Questions

Problem 2PP

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Question

It is perfectly permissible to use a pre-existing, already-opened file descriptor number as the target of dup2 (). In this event, dup2 () will close the target,
then re-open it as a copy of the source file descriptor.
True
O False

Which of the following is true about the exec1 () function call?
The calling process can no longer be waited on by its parent
O If successful, exec1 will not return
exec1 cannot return a value of -1 due to it's pid_t return type
execl returns the exit status of a program via an integer pointer

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