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“Linux Debugging frequently Asked Questions by expert members with experience in Debugging. These questions and answers will help you strengthen your technical skills, prepare for the new job test and quickly revise the concepts”

80 Linux Debugging Questions And Answers

1⟩ What is the output of this program? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { int ret; ret = pthread_exit("Bye"); printf("%dn",ret); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; } a) 0 b) 1 c) -1 d) none of the mentioned

d) none of the mentioned

Explanation:

The function pthread_exit() does not return any value. Hence this program will give an error.

Output:

[root@localhost Google]# gcc -o san san.c -lpthread

san.c: In function 'fun_t':

san.c:8:6: error: void value not ignored as it ought to be

[root@localhost google]#

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2⟩ What is the output of this program no 1? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { printf("googlen"); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); return 0; } a) this program will print the string "google" b) this program will print nothing c) segmentation fault d) run time error

b) this program will print nothing

Explanation:The pthread_join() function waits for the thread to terminate.

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

[root@localhost google]#

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3⟩ What is the output of this program no 2? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { printf("%dn",a); pthread_exit("Bye"); } int main() { int a; pthread_t pt; void *res_t; a = 10; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; } a) 10 b) 0 c) -1 d) none of the mentioned

d) none of the mentioned

Explanation:

Each thread has its own stack so local variables are not shared among thread. Hence this program will give an error.

Output:

[root@localhost google]# gcc -o san san.c -lpthread

san.c: In function 'fun_t':

san.c:7:16: error: 'a' undeclared (first use in this function)

san.c:7:16: note: each undeclared identifier is reported only once for each function it appears in

[root@localhost google]#

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4⟩ What is the output of this program no 3? #include<stdio.h> #include<pthread.h> int a; void fun_t(void arg); void fun_t(void arg) { printf("%dn",a); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; a = 10; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; } a) 10 b) 0 c) -1 d) none of the mentioned

a) 10

Explanation:

Thread of the same process shares the global variables.

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

[root@localhost google]#

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5⟩ What is the output of this program no 4? #include<stdio.h> #include<pthread.h> int a; void fun_t(void arg); void fun_t(void arg) { a = 20; pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; a = 10; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); printf("%dn",a); return 0; } a) 10 b) 20 c) segmentation fault d) none of the mentioned

b) 20

Explanation:

In this program the value of variable "a" is changed by the thread "fun_t".

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

[root@localhost google]#

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6⟩ Which one of the following statement is not true about this program? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { printf("%dn",getpid()); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); printf("%dn",getpid()); return 0; } a) both printf statements will print the same value b) both printf statements will print the different values c) this program will print nothing d) none of the mentioned

a) both printf statements will print the same value

Explanation:

All the threads of the same process have same PID.

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

12981

[root@localhost google]#

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7⟩ What is the output of this program no 6? #include<stdio.h> #include<pthread.h> #include<fcntl.h> int fd; void fun_t(void arg); void fun_t(void arg) { char buff[10]; int count; count = read(fd,buff,10); printf("%dn",count); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; fd = open("san.c",O_RDONLY); if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; } a) 10 b) 0 c) -1 d) segmentation fault

a) 10

Explanation:

Open file descritpors can be shares between threads of the same process

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

[root@localhost google]#

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8⟩ What is the output of this program no 7? #include<stdio.h> #include<pthread.h> #include<fcntl.h> void fun_t(void arg); void fun_t(void arg) { pthread_exit("Bye"); printf("googlen"); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); printf("%sn",res_t); return 0; } a) google b) Bye c) segementation fault d) run time error

b) Bye

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

Bye

[root@localhost google]#

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9⟩ What is the output of this program no 8? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { sleep(1); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); printf("%sn",res_t); return 0; } a) this process will pause b) segmentation fault c) run time error d) none of the mentioned

b) segmentation fault

Explanation:

This program is trying to print the return value of the thread, but pthread_exit() function is not present in the thread.

Output:

[root@localhost google]# gcc -o san san.c -lpthread

[root@localhost google]# ./san

Segmentation fault (core dumped)

[root@localhost google]#

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10⟩ For debugging with GDB, the file "google" can be created with the command a) gcc -g -o google google.c b) gcc -g google.c c) gdb google d) none of the mentioned

a) gcc -g -o google google.c

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11⟩ For debugging with GDB, the compiled program can be run by the command a) run b) execute c) ./ d) none of the mentioned

a) run

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12⟩ In GDB, breakpoints can be set by the command a) break b) b c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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13⟩ Which one of the following string will print first by this program? #include<stdio.h> #include<pthread.h> void fun_t(void arg); void fun_t(void arg) { printf("Googlen"); pthread_exit("Bye"); } int main() { pthread_t pt; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) != 0) perror("pthread_create"); printf("Linuxn"); if(pthread_join(pt,&res_t) != 0) perror("pthread_join"); return 0; } a) Linux b) Google c) it can not be predicted d) none of the mentioned

b) Google

Explanation:It depends upon the scheduler.

Output:

[root@localhost Google]# gcc -o san san.c -lpthread

[root@localhost Google]# ./san

Google

Linux

[root@localhost threads]#

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14⟩ GDB stands for a) GNU debugger b) general debugging breakpoint c) general debugger d) none of the mentioned

a) GNU debugger

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15⟩ GDB can be used for a) c language b) c++ language c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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16⟩ The command "gdb google" a) will start debugging for the file "google" if the file is compiled with -g option with GCC b) will create executable for debugging c) will provide all errors present in the file "google" d) none of the mentioned

a) will start debugging for the file "google" if the file is compiled with -g option with GCC

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17⟩ In debugging with GDB, break points can be set to a) any line b) any function c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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18⟩ In GDB debugging, we can proceed to the next break-point with command a) next b) continue c) both (a) and (b) d) none of the mentioned

b) continue

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19⟩ At the time of debugging with GDB, if we just press ENTER a) GDB will repeat the same command you just gave it b) GDB will do nothing c) GDB will exit d) none of the mentioned

a) GDB will repeat the same command you just gave it

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20⟩ To print the value of a variable while debugging with GDB, ______ command can be used. a) printf b) print c) show d) none of the mentioned

b) print

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Linux Debugging

Home Operating System Linux Linux Debugging

80 Linux Debugging Questions And Answers

10⟩ For debugging with GDB, the file "google" can be created with the command a) gcc -g -o google google.c b) gcc -g google.c c) gdb google d) none of the mentioned

11⟩ For debugging with GDB, the compiled program can be run by the command a) run b) execute c) ./ d) none of the mentioned

12⟩ In GDB, breakpoints can be set by the command a) break b) b c) both (a) and (b) d) none of the mentioned

14⟩ GDB stands for a) GNU debugger b) general debugging breakpoint c) general debugger d) none of the mentioned

15⟩ GDB can be used for a) c language b) c++ language c) both (a) and (b) d) none of the mentioned

16⟩ The command "gdb google" a) will start debugging for the file "google" if the file is compiled with -g option with GCC b) will create executable for debugging c) will provide all errors present in the file "google" d) none of the mentioned

17⟩ In debugging with GDB, break points can be set to a) any line b) any function c) both (a) and (b) d) none of the mentioned

18⟩ In GDB debugging, we can proceed to the next break-point with command a) next b) continue c) both (a) and (b) d) none of the mentioned

19⟩ At the time of debugging with GDB, if we just press ENTER a) GDB will repeat the same command you just gave it b) GDB will do nothing c) GDB will exit d) none of the mentioned

20⟩ To print the value of a variable while debugging with GDB, ______ command can be used. a) printf b) print c) show d) none of the mentioned

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