Answered: Please explain clearly what happes.…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Please explain clearly what happes. Step by step.

1. How many times does this code print "hello"? Note that execl is a wrapper over the execve system
call, which executes the echo program. Assume that execl always succeeds.
int main(int argc, char **argv) {
int i;
for (i=0; i < 3; i++) {
execl("/bin/echo", "echo", "hello", 0);
}
}
2. Using the program shown below, explain what will be output at Line A. Assume that fork()
completes successfully.
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
int value = 15;
int main() {
pid_t pid;
pid = fork();
if (pid == 0) {
value += 45;
} else if (pid > 0) {
wait(NULL);
printf(“PARENT: value = %d”, value); //Line A
exit(0);
}
}

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