








With explanation Please. #include #include <sys/types.h> <unistd.h> int main void ) fork fork fork execip (...
Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
1. Write program codes for 3.21 a and...
Problem la Points (20) Draw the process tree for the program shown below. #include<sys/types.h> #include<stdio.h> #include<unistd.h> int value = 5; int main() pid_t pid; pid = forko; if(pid ==0) { */ Child Process */ forkO; value += 15; return 0; else if (pid > 0) {/* Parent process */ forkO; forkO; wait(NULL); printf("Parent: value = %d", value); /* LINE A */ return 0;
What is the output? #include <sys/types.h> #include <sys/wait.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> int main() { int x = 5; int y = 2; int z = 30; x = fork(); y = fork(); if (x != 0) printf("Type 1\n"); if (y != 0) printf("Type 2\n"); z = fork(); if (x > 0 || y > 0 || z > 0) printf("Type 3\n"); if (x == 0 && y == 0 && z != 0) printf("Type 4\n"); if (x...
#include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <sys/wait.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include<time.h> void insertionSort(int arr[], int n); void merge(int a[], int l1, int h1, int h2); void mergeSort(int a[], int l, int h) { int i, len=(h-l+1); //Using insertion sort for small sized array if (len<=5) { insertionSort(a+l, len); return; } pid_t lpid,rpid; lpid = fork(); if(lpid<0) { //Lchild proc not created perror("Left Child Proc. not created\n"); _exit(-1); } else if (lpid==0) { mergeSort(a,l,l+len/2-1); _exit(0); } else...
Systems Programming Purpose: Understand the fork() regarding its returning values, global/local variables declared in the parent's process, and processing Instruction: Attached is a lab.c file containing a fork() statement. Compile and run it. Explain the output of this program. Thing to submit: Submit a word file to explain the following questions: When fork() is executed, what is happening to the returning values in parent and in child? After fork() is executed, how many more process is created? What is the...
Combine two codes (code 1) to get names with(code 2) to get info: Code 1: #include<unistd.h> #include<sys/types.h> #include<sys/stat.h> #include<fcntl.h> #include<dirent.h> #include<stdio.h> #include<stdlib.h> void do_ls(char []); int main(int argc,char *argv[]) { if(argc == 1) do_ls("."); else while(--argc){ printf("%s:\n",*++argv); do_ls(*argv); } } void do_ls(char dirname[]) { DIR *dir_ptr; struct dirent *direntp; if((dir_ptr = opendir(dirname)) == NULL) fprintf(stderr,"ls1:cannot open %s\n",dirname); else { while((direntp = readdir(dir_ptr)) != NULL) printf("%s\n",direntp->d_name); closedir(dir_ptr); } } ____________________________ code 2: #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> void show_stat_info(char *,...
#include <sys/types.h> #include <stdio.h> #include <unistd.h> int value = 10; int main() { pid_t pid; pid = fork(); if (pid == 0) { value = value + 100; } else if (pid > 0) { value = value -100; printf("PARENT: value= %d \n", value); //Line A wait (NULL); } } (i) What will be the output in Line A? Justify your answer. (ii) Do you think there is synchronization problem in updating the variable value? Justify your answer.
5. Answer the questions on the following program: #include <signal.h> #include <stdio.h> #include <unistd.h> void ouch(int sig) { printf("OUCH! -‐ I got signal %d\n", sig); } int main() { signal(SIGINT, ouch); signal(SIGQUIT, ouch); while(1) { printf("Hello World!\n"); sleep(1); } } 1) What is the output of just running the program? 2) What will happen if you try to use both keyboard signals of terminal interrupt and terminal quit: Ctrl-‐C and Ctrl-‐\ to kill the process? 3) Give exactly necessary commends...
computers. 1. How many times will this loop repeat? include <stdlib.h> #include <stdio.h> void main(void) int 10 for(= 0; i < 101) printf("d", 1); A. 10 times B. 1 time C. It will run forever D. 0 times 2. What will be the output of this program? #include <stdlib.h> #include <stdio.h> int main() int a = 100, b = 200, C = 300; if(!a >= 500) b = 300; C = 400; printf("%d, 8d, &d", a, b, c); return 0;...