Question

Please complete the following code for challenge.c in C according to the instructions in the comments. Further instructions are below in INSTRUCTIONS.txt

challenge.c

#include "challenge.h"

// goal: fork the process and have the child execute a process

// param argv: the argument vector for the process to be executed

// assumptions:

// the first argument of argv is the file name of the executable

// argv is null terminated

//

// TODO: complete the function

// fork

// exec (child), probably most convenient to use execvp

// have the parent wait on the child

void fork_exec(char** argv)

{

}

---

INSTRUCTIONS.TXT

You have one function to implement: void fork_exec(char** argv):

This takes in an array of strings representing arguments.

The first argument is the filename of an executable (which will be given as a relative filepath, such as "./a")

The remaining terms would be arguments for said executable.

The array is null terminated

You need to fork your process.

The child needs to call exec (rather, a variant thereof) to execute the specified file with the specified arguments.

Hint: I recommend using execv for the exec-ing part

execve is under manual section 2

other exec variants are under manual section 3

Answer 1

Please find the requested program below. Also including the screenshot of code to understand the indentation.

Please provide your feedback
Thanks and Happy learning!

#include <stdio.h>
#include <unistd.h>

void fork_exec(char** argv)
{
    int childExitStatus;
    pid_t pid = fork();
    if (pid == -1)
    {
        printf("Failed to fork a new process.\n");
        return;
    }
    if (pid == 0)
    {
        //In Child process
        execvp(argv[0], argv);
    }
    else
    {
        //In parent process
        //wait for the child to finish
        wait(&childExitStatus);
    }
}

int main(int argc, char** argv)
{
    fork_exec(argv);
    return 0;
}