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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

61⟩ What is the output of this program no 16? #include<stdio.h> #include<sys/types.h> #include<netinet/in.h> #include<sys/socket.h> #include<errno.h> int main() { struct sockaddr_in addr; int fd; fd = socket(AF_UNIX,SOCK_STREAM,0); if (fd == -1) perror("socket"); addr.sun_family = AF_UNIX; strcpy(addr.sun_path,"san_sock"); if (bind(4,(struct sockaddr*)&addr,sizeof(addr)) == -1) printf("Sanfoudnryn"); return 0; } a) error b) "google" c) segmentation fault d) none of the mentioned

a) error

Explanation:

The structure used for AF_UNIX if sockaddr_un.

Output:

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

san.c: In function 'main':

san.c:14:6: error: 'struct sockaddr_in' has no member named 'sun_family'

san.c:15:2: warning: incompatible implicit declaration of built-in function 'strcpy' [enabled by default]

san.c:15:13: error: 'struct sockaddr_in' has no member named 'sun_path'

[root@localhost google]#

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62⟩ While debugging with GDB, arguments to the program can be specified by the arguments of _____ command. a) run b) gdb c) make d) none of the mentioned

a) run

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63⟩ Inside GDB, a program may stop because of a) a signal b) a breakpoint c) step command d) all of the mentioned

d) all of the mentioned

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64⟩ Which one of the following is a special breakpoint that stops the program when the value of an expression changes in GDB? a) watchpoint b) catchpoint c) getpoint d) none of the mentioned

a) watchpoint

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65⟩ With the list command, by default GDB prints the ____ source lines. a) 20 b) 10 c) all d) none of the mentioned

b) 10

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66⟩ In GDB which one of the following allows us to specify a variable in terms of the file or function where it is defined? a) b) @ b) $ d) none of the mentioned

a) ::

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67⟩ If we want to print the value of a variable in hexadecimal, we have to use "print" command with the option ___ in GDB. a) x b) h c) hex d) none of the mentioned

a) x

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68⟩ Which one of the following variables is used within GDB to hold on to a value and refer to it later? a) convenience variables b) environment variables c) temporary variables d) none of the mentioned

a) convenience variables

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69⟩ In GDB, we can refer to machine register contents, in expressions, as variables with names starting with a) $ b) # c) ! d) none of the mentioned

a) $

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70⟩ In GDB hardware-dependent information about the floating point unit can be displayed by the command a) info float b) display float c) show float d) none of the mentioned

a) info float

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71⟩ The result of an expression can be assigned to an environment variable with the command a) assign b) set c) env d) none of the mentioned

b) set

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72⟩ Which one of the following GDB command deletes any break-point at the next instruction to be executed in the selected stack frame? a) clear b) delete c) disable d) none of the mentioned

a) clear

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73⟩ Which one of the following GDB command allows to move from one stack frame to another without printing the frame? a) select-frame b) frame c) frame move d) none of the mentioned

a) select-frame

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74⟩ The GDB text user interface uses the ____ library to show the source file. a) curses b) YUI c) JUI d) none of the mentioned

a) curses

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75⟩ By default the GDB automatically executes the command from its a) init files b) start files c) begin files d) none of the mentioned

a) init files

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76⟩ The user can define a command for GDB with the command a) define b) command c) assign d) none of the mentioned

a) define

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77⟩ The GDB command "show output-radix" a) sets the default base for numeric display b) displays the current default base for numeric display c) both (a) and (b) d) none of the mentioned

b) displays the current default base for numeric display

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78⟩ The command "show commands" of GDB a) displays the last 10 commands in the command history b) displays all commands of the command history c) displays all the commands available in GDB d) none of the mentioned

a) displays the last 10 commands in the command history

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79⟩ In GDB, a trace-point can be set by the command a) trace b) set c) break trace d) none of the mentioned

a) trace

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80⟩ Which one of the following command saves the command history of GDB in a file? a) history b) set history c) set history save on d) none of the mentioned

c) set history save on

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