Explain in words, what the issue with this code? (Assume there are no syntax errors) void sigint_handler (int signo) { printf ("Caught SIGINT!\n"); exit (EXIT_SUCCESS); } int main (void) { if...
Explain in words, what the issue with this code? (Assume there are no syntax errors)
void sigint_handler (int signo)
{
printf ("Caught SIGINT!\n");
exit (EXIT_SUCCESS);
}
int main (void)
{
if (signal (SIGKILL, sigint_handler) == SIG_ERR) {
exit (EXIT_FAILURE);
}
for (;;)
pause ();
return 0;
}
Homework Answers
this is the code for signal handling in a process.
the Linux users use key combination ctrl+c to terminate processes in Linux. Well, whenever ctrl+c is pressed, a signal SIGINT is sent to the process. The default action of this SIGINT signal is to terminate the process.
we have standard signals like (SIGINT,SIGTERM,etc) or we also can have user defined signals.
And it is also known that two signals in LINUX, SIGKILL and SIGSTOP cannot be handled.
in the code:
if (signal (SIGKILL, sigint_handler) == SIG_ERR) {
SIGKILL is passed to sigint_handler, and as SIGKILL cannot be handled, the program will exit because of
exit (EXIT_FAILURE);
so error in this code is that we have passed SIGKILL,which cannot be handled. We have to pass SIGINT to make this work.
if (signal (SIGINT, sigint_handler) == SIG_ERR) {
Add Answer to:
Explain in words, what the issue with this code? (Assume there are no syntax errors) void sigint_handler (int signo) { printf ("Caught SIGINT!\n"); exit (EXIT_SUCCESS); } int main (void) { if...
I have the following code in C: void sighandler(int sig) { printf("exiting child..."); } int...
I have the following code in C: void sighandler(int sig) { printf("exiting child..."); } int main(int argc,char* argv[]) { if(argc > 1) { char* commandName; for(int i=2;i { forkChild = fork(); signal(SIGINT,sighandler); if(forkChild == 0) { execlp(commandName,commandName,argv[i],NULL); exit(0); } else { wait(NULL); } } My problem is that I would like to kill the child with ^C but leave the parent running....
Run the code in Linux and provide the screenshot of the output and input #include <signal.h>...
Run the code in Linux and provide the screenshot of the output and input #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/types.h> #include <sys/socket.h> static void cleanup(); static void docleanup(int signum); static const char *SERVER_ADDR = "127.0.0.1"; static const int SERVER_PORT = 61234; static int cfd = -1; int main(int argc, char *argv[]) { struct sockaddr_in saddr; char buf[128]; int bufsize = 128, bytesread; struct sigaction sigact; printf("client starts running ...\n"); atexit(cleanup); sigact.sa_handler =...
What is the output of the following code segment and why? int main(void) { // Find...
What is the output of the following code segment and why? int main(void) { // Find the output of the following and explain it: char name[] = "Hello"; name[2] = '\0'; printf("%s\n", name); return 0; } why answer is he?
Fix the errors in C code #include <stdio.h> #include <stdlib.h> void insertAt(int *, int); void Delete(int...
Fix the errors in C code #include <stdio.h> #include <stdlib.h> void insertAt(int *, int); void Delete(int *); void replaceAt(int *, int, int); int isEmpty(int *, int); int isFull(int *, int); void removeAt(int *, int); void printList(int *, int); int main() { int *a; int arraySize=0,l=0,loc=0; int choice; while(1) { printf("\n Main Menu"); printf("\n 1.Create list\n 2.Insert element at particular position\n 3.Delete list.\n4. Remove an element at given position \n 5.Replace an element at given position\n 6. Check the size of...
Please help me debug the following code #include int main(void){ int a = 11, b =...
Please help me debug the following code
#include
int main(void){
int a = 11, b = 5;
int *ptr1 = &a, *ptr2 = &b;
printf("%d %d\n", *ptr1, *ptr2);
swap(&ptr1, &ptr2);
printf("%d %d\n", *ptr1, *ptr2);
minimum(ptr1, ptr2);
printf("%d %d\n", a, b);
return 0;
}
// Part A
void swap(int **ptr1, int **ptr2){
int *temp = *ptr1;
*ptr1 = *ptr2;
*ptr2 = temp;
return;
}
// Part B
void minimum(int *ptr1, int *ptr2){
if(*ptr1 > *ptr2){
*ptr1 = *ptr2;
}else{
*ptr2 =...
What is the output of the program segment? Assume there are no syntax errors and the...
What is the output of the program segment? Assume there are no syntax errors and the code will compile. int i = 1; int n = 0; do { cout << i; i++; } while (i <= n); b) What are the values of i and n after execution? Assume there are no syntax errors and the code will compile. int i = 1; int n = 0; do { cout << i; i++; } while (i <= n);
10 What does the last printf in this code print to the screen? a)n-7 b)n- 0...
10 What does the last printf in this code print to the screen? a)n-7 b)n- 0 c)n--1 d) None of the above 鬐include< stdio. h> int main) int n-0 for (n-7: n<O; n-- printf (n") printf ("n *%d", n); - return 11-What does the code print to the screen? 鬐include< stdio.h> void fun (int) int main) b) 8 d) None of the above fun (3) return void fun (int a) int x-10 while(a !_ 3 x > s} if a...
#include <stdio.h> #include <string.h> #include <ctype.h> #include <stdlib.h> int main(void) { /* Type your code here....
#include <stdio.h> #include <string.h> #include <ctype.h> #include <stdlib.h> int main(void) { /* Type your code here. */ int GetNumOfNonWSCharacters(const char usrStr[]) { int length; int i; int count = 0; char c; length=strlen(usrStr); for (i = 0; i < length; i++) { c=usrStr[i]; if ( c!=' ' ) { count++; } } return count; } int GetNumOfWords(const char usrStr[]) { int counted = 0; // result // state: const char* it = usrStr; int inword = 0; do switch(*it)...
/* • The following code consists of 5 parts. • Find the errors for each part...
/* • The following code consists of 5 parts. • Find the errors for each part and fix them. • Explain the errors using comments on top of each part. */ #include <stdio.h> #include <string.h> int main( ) { ////////////////////////////////////////////////////////////////////////// ////////////// Part A. (5 points) ////////////////// int g(void) { printf("%s", Inside function g\ n " ); int h(void) { printf(" % s ", Inside function h\ n "); } } printf("Part A: \n "); g(); printf(" \n"); ////////////////////////////////////////////////////////////////////////// ////////////// ...
2. Consider the following programs (using C's syntax): #include <stdio.h> int a- 1, b-2; int foo...
2. Consider the following programs (using C's syntax): #include <stdio.h> int a- 1, b-2; int foo (int x) 1 return (x+a); void ba r () { printf("%d, %d\n",a,b); void foobar) } printf("%d, %d\n", a, b) ; int a -4; bar bfoo (b); bar int main)( int b 8; foobar printf ("%d, %d\n", a, b) ; return 0; (a) What does the program print under static scoping? (b) What does the program print under dynamic scoping?
Please help me debug the following code
#include
int main(void){
int a = 11, b = 5;
int *ptr1 = &a, *ptr2 = &b;
printf("%d %d\n", *ptr1, *ptr2);
swap(&ptr1, &ptr2);
printf("%d %d\n", *ptr1, *ptr2);
minimum(ptr1, ptr2);
printf("%d %d\n", a, b);
return 0;
}
// Part A
void swap(int **ptr1, int **ptr2){
int *temp = *ptr1;
*ptr1 = *ptr2;
*ptr2 = temp;
return;
}
// Part B
void minimum(int *ptr1, int *ptr2){
if(*ptr1 > *ptr2){
*ptr1 = *ptr2;
}else{
*ptr2 =...
10 What does the last printf in this code print to the screen? a)n-7 b)n- 0 c)n--1 d) None of the above 鬐include< stdio. h> int main) int n-0 for (n-7: n<O; n-- printf (n") printf ("n *%d", n); - return 11-What does the code print to the screen? 鬐include< stdio.h> void fun (int) int main) b) 8 d) None of the above fun (3) return void fun (int a) int x-10 while(a !_ 3 x > s} if a...
2. Consider the following programs (using C's syntax): #include <stdio.h> int a- 1, b-2; int foo (int x) 1 return (x+a); void ba r () { printf("%d, %d\n",a,b); void foobar) } printf("%d, %d\n", a, b) ; int a -4; bar bfoo (b); bar int main)( int b 8; foobar printf ("%d, %d\n", a, b) ; return 0; (a) What does the program print under static scoping? (b) What does the program print under dynamic scoping?
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