1 No

2 Yes

3

4

1 mkdev

2 mknod

3 lndev

4 None

1 A dummy device to represent memory

2 A dummy device to represent the processor

3 A dummy device to provide infinite number of zeros

4 None

1 A device file to represent that the current file system is full

2 A device file to test scenarios of testing a /dev/full

3 Invalid device

4 None

1 A dummy device to represent swap

2 A dummy device to represent any device

3 A dummy device to provide infinite number of randon numbers

4 Invalid device

1 True

2 False

3

4

1 lseek(), open(), write(), close()

2 open(), write(), lseek(), close()

3 open(), lseek(), open(), , write() close()

4 None

1 vforlk() allows more one child process to be created simaltaneously whereas for() allows only one

2 vfork() retains same PID for child & parent known as virtual PID

3 vfork() suspends the parent process until child process exits

4 fork() & vfork() are same

1 getenv(), setenv()

2 getenv(), putenv()

3 readenv(), writeenv()

4 You cannot environmement variables inside a program

1 Wakes up kernel from sleeping

2 Wakes up devices from sleeping

3 Invokes a kernel to send SIGALARM to the calling process

4 Invokes a kernel to send SIGALARM to the registered process

1 A memeory shared between kernel & devices

2 A memory shared between root user and ordinary user

3 A memory shared across processes

4 Harddisk

1 The interval between child terminating and the parent calling wait()

2 The interval between parent terminating and the child calling popen()

3 The interval between parent terminating and the child termination

4 None

1 Run with root user

2 Run with &

3 Run with root user using &

4 None

1 They never releases the memory utilized

2 They release the memory but kernel does not use them

3 Since they are running

4 It’s a false statement

1 Its not possible

2 use isused() function

3 Try to open file with locking enabled

4 Try to write the file after opening

1 Use filelock()

2 use lockfile()

3 Use lockfd()

4 use fcntl()

1 Use ls -l

2 Use sizeof()

3 Use filesize()

4 Use fstat()

1 Use getmemory()

2 Use sysctl()

3 Use freemem()

4 Use malloc()

1 A port to connect printer 2

A port to connect keyboard

3 An abstraction to pass data across processes

4 A hardware device

1 A mechanism to share non-sharable resources

2 A mechanism to access memory very fast

3 A mechanism to access kernel details

4 None