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Basic Kernel Programming - Solaris MCQ

1. Which of the following structures keeps track of the in memory user data pages associated with a file?

struct vnode

the private data maintained by a filesystem attached to a vnode.

page_t

struct uio

Answer

Correct Answer: the private data maintained by a filesystem attached to a vnode.

Note: This Question is unanswered, help us to find answer for this one

2. Which of the following data is penalized (swapped) first if the OS detects low memory conditions?

Page Cache pages.

Buffer Cache data.

DLNC entries are purged.

Inode cache entries are purged.

Answer

Correct Answer: Page Cache pages.

Note: This Question is unanswered, help us to find answer for this one

3. Where are the 64 bit kernel modules located?

/kernel/drv/64/

/kernel/drv/

/kernel/drv/sparcv9/

/usr/lib/sparcv9/

Answer

Correct Answer: /kernel/drv/sparcv9/

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4. What is the maximum number of registers available to a function at any time?

128

Answer

Correct Answer: 32

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5. What are the names of the symbol file and the memory image files following a kernel dump?

symbol and core

symbol and a.out

unix and vmcore

unix.X and vmcore.X where X is an integer.

Answer

Correct Answer: unix.X and vmcore.X where X is an integer.

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6. Which of the following is the correct locking hierarchy for filesystems which implement the mmap interface?

rwlock; glock

glock; rwlock

rwlock by itself. glock is not necessary.

glock by itself. rwlock is not necessary.

Answer

Correct Answer: rwlock; glock

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7. Which of the following registers contains the thread pointer of the thread that is currently being run?

%i7

%o7

%g7

%l7

Answer

Correct Answer: %g7

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8. Why should floating point operations be avoided in drivers?

Because solaris does not support floating point operations at all.

Because the sparc hardware does not support floating point operations.

Because the kernel does not support floating point operations.

Because they are expensive to perform.

Answer

Correct Answer: Because the kernel does not support floating point operations.

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9. What does the cv_wait_sig interface do?

It waits on the CV until the thread receives a specified external signal (sent via kill(2)).

It waits on the CV until the thread receives a wakeup. It returns 0 if the thread receives an external signal (sent via kill(2)).

It waits on the CV and ignores the specified signal but returns 0 if some other signal is received.

It registers a call back with the kernel for the specified signal.

Answer

Correct Answer: It waits on the CV until the thread receives a wakeup. It returns 0 if the thread receives an external signal (sent via kill(2)).

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10. Is it possible to take a core dump of a live system?

Yes

Answer

Correct Answer: Yes

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11. Which of the following interfaces must be implemented by every loadable driver?

_init; _fini

_init; _fini; probe

_init; _info; _fini

_init; _fini; open; close

Answer

Correct Answer: _init; _fini; probe

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12. Which of the following interfaces is equivalent to acquiring a lock?

sema_v

sema_p

sema_init

sema_lock

Answer

Correct Answer: sema_p

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13. Following a panic and a core dump, what is done to recreate the core files for debugging?

Use dumpadm to create the core files.

Use savecore to create the core files.

Nothing needs to be done; the os guarantees that the core files are always saved.

Use dd to move the core files from the dump device to the filesystem.

Answer

Correct Answer: Use savecore to create the core files.

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14. Which of the following sparc instructions causes a register window context to be created?

ldstub

save

restore

movrw

Answer

Correct Answer: save

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15.
Where is the following memory allocation type typically employed?
memp = kmem_alloc(size, KM_NOSLEEP);

In the user context code as a backend to malloc.

In the kernel context where every place memory needs to be allocated.

In the interrupt context.

In the buffer cache.

Answer

Correct Answer:

In the interrupt context.

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16. Which of the following does the OS use for caching user data?

Buffer Cache

Inode Cache

Page Cache

DNLC

Answer

Correct Answer: Page Cache

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17. Which of the following CV interfaces can be used to wakeup exactly one waiter?

cv_broadcast

cv_wakeone

cv_wakeall

cv_signal

Answer

Correct Answer: cv_signal

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18. Which of the following locks is used to serialize reads and writes on a vnode?

The global VFS lock.

The locks on the page structures.

The VOP_RWLOCK.

The locks on the buffer structures.

Answer

Correct Answer: The VOP_RWLOCK.

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19. Which of the following kadb macros is useful in determining the panic address?

*panicstr

Answer

Correct Answer: $

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20. What does the VFS_ROOT interface do?

It takes a vnode and a vfs and markes (marks or makes?) the vnode as the root vnode for the filesystem.

It returns the root vnode of the specified vfs.

It returns the parent vnode of the specified vnode.

It returns the parent vfs of the specified vfs.

Answer

Correct Answer: It returns the root vnode of the specified vfs.

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21. Is the memory allocated by kmem_alloc paged?

Yes

No

Answer

Correct Answer: Yes

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22. Which of the following buffer structure fields specifies the direction of IO transfer, the transfer size and the virtual address of the data?

b_flags

b_bcount

b_un

b_blkno

Answer

Correct Answer: b_bcount
b_blkno

Note: This question has more than 1 correct answers

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23. Which of the following interfaces to a block device driver does the filesystem use?

int strategy(struct vnode *);

int strategy(struct buf *);

void strategy(struct uio *);

int strategy(struct file *);

Answer

Correct Answer: int strategy(struct buf *);

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24. Which of the following types of information is stored within the buffer cache?

Filesystem Metadata

User Pages backed by files.

Anonymous Pages.

DNLC entries.

Answer

Correct Answer: Filesystem Metadata

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25. Which of the following is true if an interrupt thread needs to block on a resource?

Interrupt threads on solaris cannot block.

They can be scheduled to run on a different processor once they are runnable.

They are scheduled to run on the same processor.

The system hangs.

Answer

Correct Answer: They are scheduled to run on the same processor.

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26. Which of the following sequences involving a CV is correct if a thread wants to wait for an event?

cv_init; mutex_enter; cv_wait; mutex_exit; cv_destroy

cv_init; cv_wait; cv_destroy

cv_init; cv_signal; cv_destroy

cv_init; cv_timedwait; cv_destroy

Answer

Correct Answer: cv_init; mutex_enter; cv_wait; mutex_exit; cv_destroy

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27. Which of the following abstractions enables a multi-threaded application to take advantage of the available parallelism?

User threads.

LWP.

Kernel threads.

User processes.

Answer

Correct Answer: LWP.

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28. What sequence of key strokes is required to trap into the kadb in a live session?

STOP-A on sun keyboards.

send brk via a telnet session.

CTRL-A on sun keyboards.

tip b via a serial console session.

Answer

Correct Answer: send brk via a telnet session.
CTRL-A on sun keyboards.

Note: This question has more than 1 correct answers

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29. In which of the following contexts do callouts run?

User

Kernel thread.

LWP

Interrupt.

Answer

Correct Answer: Kernel thread.

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30. Which of the following caches doesnot change its size dynamically on older solaris systems?

Page Cache

Vnode Cache

Inode Cache

Buffer Cache

Answer

Correct Answer: Buffer Cache

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31. On a sparc system, which of the register set of a calling function is passed on as input registers to the called function?

input

output

local

global

Answer

Correct Answer: output

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32. What is the correct way of initializing a mutex on solaris?

mutex_init(lock pointer, lock name, type of mutex)

mutex_init(lock pointer)

mutex_enter(lock pointer)

mutex_initialize(lock pointer)

Answer

Correct Answer: mutex_init(lock pointer, lock name, type of mutex)

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33. Can the solaris semaphores be used in the interrupt context?

Yes

No

Answer

Correct Answer: Yes

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34. What is the kernel interface to initialize a reader writer lock?

readwrite_init(lock pointer)

rw_initialize(lock pointer)

rw_init(lock pointer)

rw_enter(lock pointer)

Answer

Correct Answer: readwrite_init(lock pointer)

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35. What is the compiler option to generate a 64 bit binary loadable on a sparc machine?

-xarch=v5

-xarch=v9

-64

-target=64

Answer

Correct Answer: -xarch=v9

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36. What are the commands to load and unload the kernel module 'mymod'?

insmod mymod; rmmod mymod

pkgadd mymod; pkgrm mymod

modload mymod; modunload mymod

modload mymod; modunload -i moduleid

Answer

Correct Answer: modload mymod; modunload -i moduleid

Note: This Question is unanswered, help us to find answer for this one

37. Which of the following operations results in the page cache being populated?

memory mapped IO

read(2)/write(2) system calls

opening a regular unix file.

opening a socket.

Answer

Correct Answer: read(2)/write(2) system calls

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38. What happens if a driver running on a sparc processor tries to access a 32 bit quantity which is aligned on a 16 bit boundary?

The processor automatically handles this situation.

The system panics.

Such a driver code will not be compiled.

Such a driver code will not be loaded.

Answer

Correct Answer: The system panics.

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39. What is the command to boot into the kernel debugger (kadb) from an 'ok' prompt?

boot kadb

kadb

unix kadb

go kadb

Answer

Correct Answer: unix kadb

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40. Which of the following kernel defined data types is involved in the interface calls to manipulate CVs?

kmutex_t

kcondvar_t

vnode_t

page_t

Answer

Correct Answer: kmutex_t
kcondvar_t

Note: This question has more than 1 correct answers

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41. The OS can unload a module automatically if needed.

True

False

Answer

Correct Answer: True

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42. Which of the following kadb/adb macros can be used to examine the stack traces of all the kernel threads?

$

$

$

$

Answer

Correct Answer: $

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43. Which of the following kernel subsystems employs a semaphore for synchronization?

Inode Cache

Buffer Cache

Page Cache

DNLC

Answer

Correct Answer: Buffer Cache

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44. Is the thread allowed to perform any kind of blocking operation while holding a mutex?

Yes

No

Answer

Correct Answer: Yes

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45. Is the glock necessary if a filesystem does not implement the mmap interface?

Yes

No

Answer

Correct Answer: No

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46. Which of the following mechanisms enables solaris to support real time applications?

Hidden scheduling.

Priority inheritance.

Priority inversion.

Interrupts.

Answer

Correct Answer: Priority inversion.

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47. If there is contention between readers and writers on an rw lock, which of them are given preference over the other?

Readers

Writers

Neither (there is FCFS granting of locks).

Both (there is one grant from either group).

Answer

Correct Answer: Writers

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48. Which of the following kadb/adb commands prints the contents of the register set at a particular stack depth?

$

$C

$r

$b

Answer

Correct Answer: $r

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49. The condition variable synchronization primitives need which of the following primitives to be employed by the client code to function correctly?

Reader-writer locks.

Mutex

Semaphore

Spin lock

Answer

Correct Answer: Mutex

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50. Which of the following interfaces does the OS call to translate path names to vnodes?

VOP_LOOKUP

VOP_READDIR

VOP_GETPAGE

VOP_READ

Answer

Correct Answer: VOP_LOOKUP
VOP_READDIR

Note: This question has more than 1 correct answers

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51. Which of the following information must be tracked explicitly by a driver that allocates memory via kmem_alloc?

The address of the allocated memory.

The size of the allocated memory.

The alignment of the allocated memory.

The thread that allocated the memory.

Answer

Correct Answer: The address of the allocated memory.
The size of the allocated memory.

Note: This question has more than 1 correct answers

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52. Which of the following is true of the memory allocated by kmem_alloc?

It is double word aligned.

It is pageable.

It is zero initialized.

Its availability is limited to the amount of physical memory.

Answer

Correct Answer: It is double word aligned.
Its availability is limited to the amount of physical memory.

Note: This question has more than 1 correct answers

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53.
What does the following kernel interface do?
rw_lock_held(lock pointer);

It checks if the lock is held in the read mode.

It checks if the lock is held in the write mode.

It does 'a' and locks it in the write mode.

It does 'b' and locks it in the read mode.

Answer

Correct Answer:
It checks if the lock is held in the read mode.

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54. Which of the following firmware commands causes a kernel core file to be dumped to the dump device?

$sync

sync

dump

$dump

Answer

Correct Answer: sync

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55. How many times can a semaphore be acquired without blocking?

It depends on the count associated with the semaphore.

1

2

0

Answer

Correct Answer: It depends on the count associated with the semaphore.

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56. Which of the following interfaces is the preferred way for drivers to log messages?

printf

cmn_err

dmesg

log

Answer

Correct Answer: printf

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57. The memory allocated by kmem_alloc is private to the kernel thread that allocated it.

True

False

Answer

Correct Answer: False

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58. Which of the following kernel interfaces can be used by a driver interface like open to identify the specific device instance involved in the operation?

getmajor(dev_t)

getminor(dev_t)

open

((dev_t) dev) & 0xFFFF0000;

Answer

Correct Answer: getminor(dev_t)

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59. Which of the following sparc instructions is employed before returning from a function to restore the original context?

restore

pop

revert

ret

Answer

Correct Answer: restore

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60. Which of the following commands can be used to examine the panic stack trace?

$r

$

$C

$

Answer

Correct Answer: $r
$C

Note: This question has more than 1 correct answers

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61. Which of the following has the lowest scheduling latency?

User thread.

Kernel thread.

User Process.

LWP.

Answer

Correct Answer: Kernel thread.

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62. What is the outcome if an interrupt handler needs to block on a resource?

The kernel will detect this situation and will panic the system.

The system will hang.

The interrupt handler will block until it can run again.

None of the above.

Answer

Correct Answer: The interrupt handler will block until it can run again.

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63. Can the mutex be locked by one kernel thread and unlocked by another kernel thread?

Yes

No

Answer

Correct Answer: No

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64. Which of the following sparc instructions forms the basis of all other locking strategies?

lock

ldstub

movsb

save

Answer

Correct Answer: ldstub

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65. Which of the following sets does a breakpoint at the start of the kernel function ufs_read?

ufs_read:b

ufs_read!break

::break ufs_read

ufs_read>break

Answer

Correct Answer: ufs_read:b

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66. Solaris rw locks are recursive locks. A thread that already holds a lock in the read mode can acquire the lock in the read mode again.

True

False

Answer

Correct Answer: False

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67. Which of the following adb/kadb commands can be used to determine the function which caused the panic?

$

panic address?ia

$r

$C

Answer

Correct Answer: $
panic address?ia

Note: This question has more than 1 correct answers

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68. Which of the following abstractions is the fundamental schedulable entity on a solaris machine?

User process.

LWP.

Kernel thread.

Interrupt handler.

Answer

Correct Answer: Interrupt handler.

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69. Which of the following interfaces can be used by a driver interface routine to copy data from and to the user address space?

memcpy

bcopy

copyin;copyout

memmove

Answer

Correct Answer: bcopy

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70. Which of the following structures describes the user initiated IOs?

struct buf

struct file

struct uio

struct sio

Answer

Correct Answer: struct uio

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71. Which of the following structures keeps track of the positional offset within the file where the next IO is to be performed?

struct file

struct vnode

struct inode

struct proc

Answer

Correct Answer: struct file

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72.
On a solaris system with no special kmem_flag settings,
what happens when a thread running buggy code frees a buffer twice.

The results are unpredictable including a panic.

The kernel fails the second kmem_free.

The kernel kills the thread with a SEGFAULT.

The second free is harmless as the kernel knows that the memory has already been freed.

Answer

Correct Answer:
The second free is harmless as the kernel knows that the memory has already been freed.

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73. Which of the following commands can be used to examine and delete kernel breakpoints?

$b, :d

::break, ::delete

$b, ::delete

display break, delete break

Answer

Correct Answer: ::break, ::delete

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74.
What do the following mdb commands do?
::allocdby
::freedby

They are used to print the log of transactions on a particular memory location.

They are used to print the log of transactions by a particular thread.

They are used to print the slab cache that refers to the particular address.

They are used to print the arenas that refer to the particular address.

Answer

Correct Answer:
They are used to print the log of transactions by a particular thread.

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75.
Which of the following calls fits in at 'statement xxx'
to produce correct results in the code snippet below?
mutex_enter(mutex pointer);
while (condition is false) {
cv_wait(cv pointer, mutex pointer);
}
statement xxx;
mutex_exit(mutex pointer);

mutex_enter(mutex pointer)

mutex_exit(mutex_pointer)

nothing needs to be done.

cv_signal(cv pointer)

Answer

Correct Answer:
nothing needs to be done.

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76. What does the vfs_vnodecovered field of a vfs structure indicate?

It points to the mounted on directory's vnode structure.

It points to the root inode of the filesystem.

It points to the root directory of the parent filesystem.

It points to the vfs structure of the parent filesystem.

Answer

Correct Answer: It points to the root inode of the filesystem.

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77. Which of the following sequences correctly builds the loadable module 'mymod'?

cc mymod.c

cc -o mymod.o mymod.c; ld -o mymod mymod.o

cc -D_KERNEL mymod.c

cc -D_KERNEL -o mymod.o; ld -r -o mymod mymod.o

Answer

Correct Answer: cc -D_KERNEL -o mymod.o; ld -r -o mymod mymod.o

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78. What is the significance of setting the kernel global variable 'kmem_flags' to '0xf'?

It turns on buffer redzone (write past end of buffer).

It turns on freed buffer checking.

It turns on allocator auditing.

It turns on uninitialized data checking.

All of the above

Answer

Correct Answer: All of the above

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79. In which of the following contexts does the solaris kernel handle interrupts?

User context.

LWP context.

On a separate interrupt stack without any special context.

In a kernel thread context.

Answer

Correct Answer: In a kernel thread context.

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80. Which of the following is pageable?

kernel stack.

user addresses.

kernel heap.

kernel code.

Answer

Correct Answer: kernel stack.
user addresses.

Note: This question has more than 1 correct answers

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81. Which of the following components is responsible for speeding up file paths to inode lookups?

Page Cache

DNLC

Buffer Cache

Vnode Cache

Answer

Correct Answer: Page Cache

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82. Which of the following interfaces can be used to avert a thundering herd of waiters?

cv_broadcast

cv_signal

cv_wakeall

cv_wakeone

Answer

Correct Answer: cv_signal

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83. Which of the following interfaces needs to be implemented for a filesystem to support swap files?

VOP_WRITE and VOP_READ

VOP_GETPAGE and VOP_PUTPAGE

VOP_MAP and VOP_UNMAP

VOP_PAGEIO

Answer

Correct Answer: VOP_GETPAGE and VOP_PUTPAGE

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84. The OS guarantees that a thread blocked on a cv via a cv_wait call does not wakeup prematurely and hence does not need to re-check for the reason for blocking.

True

False

Answer

Correct Answer: False

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85. Which of the following interfaces is used by the driver to signal the completion of an IO initiated by a strategy call?

biowait

cv_broadcast

biodone

cv_signal

Answer

Correct Answer: cv_broadcast

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86. Which of the following commands prints out the kernel device tree?

ls

drvconf

prtconf

devlinks

Answer

Correct Answer: drvconf

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87. What does the v_vfsmountedhere field of a vnode indicate?

If set to 1, it indicates that a filesystem is mounted on that vnode.

It points to the root vnode of the filesystem to which the vnode belongs.

It points to the vfs structure of the mounted on filesystem.

It points to the root vnode of the mounted on filesystem.

Answer

Correct Answer: It points to the root vnode of the filesystem to which the vnode belongs.

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88. What does the VOP_INACTIVE interface do?

It drops the reference count on a vnode.

It deletes all data associated with a vnode.

It drops the reference count on a vnode and if required it deletes all data associated with a vnode.

It increments the reference count on a vnode.

Answer

Correct Answer: It drops the reference count on a vnode and if required it deletes all data associated with a vnode.

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89. Which of the following interfaces are invoked by the OS to flush all data belonging to a filesystem to a disk?

VOP_FSYNC

VFS_SYNC

VOP_PUTPAGE

VOP_WRITE

Answer

Correct Answer: VFS_SYNC

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90. What are the basic mutex operations supported by the solaris operating system?

Initializing and deinitializing the mutex

Exclusively locking and unlocking the mutex

Reader writer locking semantics on the mutex

Try acquire mutex exclusive

Answer

Correct Answer: Initializing and deinitializing the mutex
Reader writer locking semantics on the mutex

Note: This question has more than 1 correct answers

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91. How many LWPs must a process have to maximize its parallelism?

None

Two

It should be the same as the number of processors.

It should be a factor of the available RAM.

Answer

Correct Answer: It should be the same as the number of processors.

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92. Which of the following cache entries need to be purged/invalidated if a file is deleted?

DNLC

Page Cache

Buffer Cache

Inode Cache

Answer

Correct Answer: DNLC
Page Cache

Note: This question has more than 1 correct answers

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Basic Kernel Programming - Solaris MCQ

1. Which of the following structures keeps track of the in memory user data pages associated with a file?

2. Which of the following data is penalized (swapped) first if the OS detects low memory conditions?

3. Where are the 64 bit kernel modules located?

4. What is the maximum number of registers available to a function at any time?

5. What are the names of the symbol file and the memory image files following a kernel dump?

6. Which of the following is the correct locking hierarchy for filesystems which implement the mmap interface?

7. Which of the following registers contains the thread pointer of the thread that is currently being run?

8. Why should floating point operations be avoided in drivers?

9. What does the cv_wait_sig interface do?

10. Is it possible to take a core dump of a live system?

11. Which of the following interfaces must be implemented by every loadable driver?

12. Which of the following interfaces is equivalent to acquiring a lock?

13. Following a panic and a core dump, what is done to recreate the core files for debugging?

14. Which of the following sparc instructions causes a register window context to be created?

15. Where is the following memory allocation type typically employed?memp = kmem_alloc(size, KM_NOSLEEP);

16. Which of the following does the OS use for caching user data?

17. Which of the following CV interfaces can be used to wakeup exactly one waiter?

18. Which of the following locks is used to serialize reads and writes on a vnode?

19. Which of the following kadb macros is useful in determining the panic address?

20. What does the VFS_ROOT interface do?

21. Is the memory allocated by kmem_alloc paged?

22. Which of the following buffer structure fields specifies the direction of IO transfer, the transfer size and the virtual address of the data?

23. Which of the following interfaces to a block device driver does the filesystem use?

24. Which of the following types of information is stored within the buffer cache?

25. Which of the following is true if an interrupt thread needs to block on a resource?

26. Which of the following sequences involving a CV is correct if a thread wants to wait for an event?

27. Which of the following abstractions enables a multi-threaded application to take advantage of the available parallelism?

28. What sequence of key strokes is required to trap into the kadb in a live session?

29. In which of the following contexts do callouts run?

30. Which of the following caches doesnot change its size dynamically on older solaris systems?

31. On a sparc system, which of the register set of a calling function is passed on as input registers to the called function?

32. What is the correct way of initializing a mutex on solaris?

33. Can the solaris semaphores be used in the interrupt context?

34. What is the kernel interface to initialize a reader writer lock?

35. What is the compiler option to generate a 64 bit binary loadable on a sparc machine?

36. What are the commands to load and unload the kernel module 'mymod'?

37. Which of the following operations results in the page cache being populated?

38. What happens if a driver running on a sparc processor tries to access a 32 bit quantity which is aligned on a 16 bit boundary?

39. What is the command to boot into the kernel debugger (kadb) from an 'ok' prompt?

40. Which of the following kernel defined data types is involved in the interface calls to manipulate CVs?

41. The OS can unload a module automatically if needed.

42. Which of the following kadb/adb macros can be used to examine the stack traces of all the kernel threads?

43. Which of the following kernel subsystems employs a semaphore for synchronization?

44. Is the thread allowed to perform any kind of blocking operation while holding a mutex?

45. Is the glock necessary if a filesystem does not implement the mmap interface?

46. Which of the following mechanisms enables solaris to support real time applications?

47. If there is contention between readers and writers on an rw lock, which of them are given preference over the other?

48. Which of the following kadb/adb commands prints the contents of the register set at a particular stack depth?

49. The condition variable synchronization primitives need which of the following primitives to be employed by the client code to function correctly?

50. Which of the following interfaces does the OS call to translate path names to vnodes?

51. Which of the following information must be tracked explicitly by a driver that allocates memory via kmem_alloc?

52. Which of the following is true of the memory allocated by kmem_alloc?

53. What does the following kernel interface do?rw_lock_held(lock pointer);

54. Which of the following firmware commands causes a kernel core file to be dumped to the dump device?

55. How many times can a semaphore be acquired without blocking?

56. Which of the following interfaces is the preferred way for drivers to log messages?

57. The memory allocated by kmem_alloc is private to the kernel thread that allocated it.

58. Which of the following kernel interfaces can be used by a driver interface like open to identify the specific device instance involved in the operation?

59. Which of the following sparc instructions is employed before returning from a function to restore the original context?

60. Which of the following commands can be used to examine the panic stack trace?

61. Which of the following has the lowest scheduling latency?

62. What is the outcome if an interrupt handler needs to block on a resource?

63. Can the mutex be locked by one kernel thread and unlocked by another kernel thread?

64. Which of the following sparc instructions forms the basis of all other locking strategies?

65. Which of the following sets does a breakpoint at the start of the kernel function ufs_read?

66. Solaris rw locks are recursive locks. A thread that already holds a lock in the read mode can acquire the lock in the read mode again.

67. Which of the following adb/kadb commands can be used to determine the function which caused the panic?

68. Which of the following abstractions is the fundamental schedulable entity on a solaris machine?

69. Which of the following interfaces can be used by a driver interface routine to copy data from and to the user address space?

70. Which of the following structures describes the user initiated IOs?

71. Which of the following structures keeps track of the positional offset within the file where the next IO is to be performed?

72. On a solaris system with no special kmem_flag settings,what happens when a thread running buggy code frees a buffer twice.

73. Which of the following commands can be used to examine and delete kernel breakpoints?

74. What do the following mdb commands do?::allocdby::freedby

75. Which of the following calls fits in at 'statement xxx'to produce correct results in the code snippet below?mutex_enter(mutex pointer);while (condition is false) { cv_wait(cv pointer, mutex pointer);}statement xxx;mutex_exit(mutex pointer);

76. What does the vfs_vnodecovered field of a vfs structure indicate?

77. Which of the following sequences correctly builds the loadable module 'mymod'?

78. What is the significance of setting the kernel global variable 'kmem_flags' to '0xf'?

79. In which of the following contexts does the solaris kernel handle interrupts?

15.
Where is the following memory allocation type typically employed?
memp = kmem_alloc(size, KM_NOSLEEP);

53.
What does the following kernel interface do?
rw_lock_held(lock pointer);

72.
On a solaris system with no special kmem_flag settings,
what happens when a thread running buggy code frees a buffer twice.

74.
What do the following mdb commands do?
::allocdby
::freedby

75.
Which of the following calls fits in at 'statement xxx'
to produce correct results in the code snippet below?
mutex_enter(mutex pointer);
while (condition is false) {
cv_wait(cv pointer, mutex pointer);
}
statement xxx;
mutex_exit(mutex pointer);