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Q:

How can you get/set an environment variable from a program?

Answer

Getting the value of an environment variable is done by using `getenv()’. Setting the value of an environment variable is done by using `putenv()’

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Subject: Operating Systems Exam Prep: GATE

Q:

getppid() system call is used to bias the existing priority of a process

A) TRUE

B) FALSE

Answer & Explanation Answer: B) FALSE

Explanation:

It is used to get parent process identifier

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Subject: Operating Systems
Exam Prep: GATE

Q:

Which among the following is a system call used for process management

A) fork()	B) exec()
C) getppid()	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

All the above listed are the System calls for process management

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Filed Under: Operating Systems
Exam Prep: GATE
Job Role: Software Architect

Q:

main()

{

fork();

printf(“Hello World!”);

}

Output for the above unix program is

A) Hello World!	B) Hello World!Hello World!
C) Hello World	D) None

Answer & Explanation Answer: B) Hello World!Hello World!

Explanation:

The fork creates a child that is a duplicate of the parent process. The child begins from the fork().All the statements after the call to fork() will be executed twice.(once by the parent process and other by child). The statement before fork() is executed only by the parent process

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Filed Under: Operating Systems
Exam Prep: GRE

Q:

Explain fork() system call?

Answer

The `fork()’ used to create a new process from an existing process. The new process is called the child process, and the existing process is called the parent. We can tell which is which by checking the return value from `fork()’. The parent gets the child’s pid returned to him, but the child gets 0 returned to him.

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Subject: Operating Systems Exam Prep: GATE

Q:

Which among the following are not the children of Swapper or Scheduler?

A) Process Dispatcher	B) Vhand
C) Dbflush	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

Process Dispatcher,Vhand,Dbflush are the children of Scheduler

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Filed Under: Operating Systems
Exam Prep: GATE

Q:

onclick="window.open()":This attribute of HTML control is used to open a page in new window

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

To open a page in a new window, you have to use client script using onclick="window.open()" attribute of HTML control.

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Subject: .NET
Job Role: Software Architect

Q:

Which among the following validators checks if entered data matches a specific format

A) Compare validator	B) RegularExpressionValidator
C) CustomValidator	D) None

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