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 Mcq  Modul 05
Correct ans
Question 1To determine if the system shell is available or not you would use the following invocation:
Correct!
  
if(system(NULL)) {...}

  
if(system("shell")) {...}

  
if(system("NULL")) {...}

  
if(system("")) {...}


Question 2
1 / 1 pts
Which of the following main() function's headers is valid?
Correct!
  
int main(int argc, char *argv[], char **env)

  
int main(int argc, char *argv[], char ***env)

  
int main(int argc, char *argv[], char env)

  
int main(int argc, char *argv[], char *env)


Question 3
1 / 1 pts
After successful invocation the fork() function:
  
returns 0 in parent and parent's PID in child

Correct!
  
returns 0 in child and child's PID in parent

  
returns 0 in both child and parent


returns child's PID in parent and parent's PID in child

Question 4
1 / 1 pts
Assuming that the code was compiled and ran in Unix/Linux environment what is its expected output?
#include <stdio.h>
#include <unistd.h>
int x = 0;
int main(void) {
if(fork()) {
printf("%d", ++x);
return 0;
} else {
printf("%d", ++x);
return 0;
}
}
Correct!
  
11

  
12

  
21

  
22


Question 5
1 / 1 pts
A variant of exec() function designed to pass a copy of environment to new process as well as using PATH to find the executable and accepting arguments placed in an array, is named:
  
execlp

Correct!
  
execvpe

  
execl

  
execlpe


Question 6
1 / 1 pts
A native Unix/Linux functions named wait() and waitpid() in the MS Windows environment:

are not needed due to different processes' serving philosophy
  
are replaces by Wait() and WaitPid() functions

  
have the same names and purpose

Correct!

may be substituted by WaitForSingleObject() function

Question 7
1 / 1 pts
Which of the "C" programming language standards offers built-in thread implementation?
  
C99

Correct!
  
C11

  
ANSI C

  
C89


Question 8
1 / 1 pts
In the MS Windows threads a single thread is represented as a value of type:
  
thread_t

  
thrd_t

Correct!
  
HANDLE

  
msthread_t


Question 9
1 / 1 pts
In MS Windows environment, if the main thread wants to wait for all other thread completion, it:

must use a number of subsequent invocations of WaitForSingleObject() function
  
uses Sleep() function

Correct!
  
may use the WaitForMultipleObjects() function

  
spends some time in an empty delay loop


Question 10
1 / 1 pts
The WINAPI specifier means that the function:
Correct!

is an obsolete implementation of standard Windows service
  
is not accessible from outside

  
uses standard MS Windows calling convention

  
is a static function


Question 11
1 / 1 pts
What is possible result of the following invocation?
#include <stdlib.h>
int main(int argc, char *argv[]) {
system(argv[0\]);
return 0;
}
  
stack overflow error

  
compiler error

  
OS shell error

Correct!
  
infinitive loop of launches


Question 12
1 / 1 pts
The third main() function parameter is:

a pointer to array containing argc pointers to environment variables
Correct!

a pointer to a NULL-terminated array of pointers to environment

a NULL-terminated array of pointers to environment variables
  
a pointer to first environment variable


Question 13
1 / 1 pts
Assuming that the following snippet is executed in MS Windows environment, its effect is:
putenv("VAR=");
  
setting the VAR's value to empty string

  
nothing

  
print the VAR's value to stdout

Correct!
  
removing the VAR from environment


Question 14
1 / 1 pts
Assuming that the code was compiled and ran in Unix/Linux environment what is its expected output?
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(void) {
printf("%d", fork() == 0);
wait(NULL);
return 0;
}
  
1 or 0

Correct!
  
10 or 01

  
always 00

  
always 11


Question 15
1 / 1 pts
The pid_t type is:
  
an unsigned int

  
a pointer to void

  
a string

Correct!
  
an int


Question 16
1 / 1 pts
The MS Windows' HANDLE data type:
  
is the same as Unix/Linux PID

Correct!

is an unique resource identifier and plays different role than PID

is a string with process name and plays different role than PID
  
is a structure containing PID


Question 17
1 / 1 pts
A thread, in P-thread sense, is a function of type:
Correct!
  
void *thread(void *data);

  
void thread(void *data);

  
int thread(void *data);

  
void *thread(void);


Question 18
1 / 1 pts
In the MS Windows threads a single thread is represented as a value of type:
Correct!
  
HANDLE

  
msthread_t

  
thrd_t

  
thread_t


Question 19
1 / 1 pts
The term "obtain a mutex"
  
is not used in any OS environment


means the same as "release a mutex" in different OS environment

means the same as "close a mutex" in different OS environment
Correct!

means the same as "lock a mutex" in different OS environment

Question 20
1 / 1 pts
To determine its ID the thread running in MS Windows environment uses:
  
its own name

  
its own handle

Correct!
  
GetCurrentThreadId() function

  
its own address