I am working on an assignment that involves using fork. The program runs two separate programs simultaneously and tells the user which one finished first. If a child finishes, the other child still running should be killed immediately.
My code so far is this...
int main(int argc, char **argv) {
if (argc != 2) {
perror("Invalid number of arguments!");
exit(1);
}
pid_t pid;
pid_t wpid;
int status = 0;
for (int i = 0; i < 2; i++) {
if ((pid = fork()) == 0) {
execv("/bin/sh", argv[i+1]);
}
}
while ((wpid = wait(&status)) > 0);
printf("%s finished first!", <Insert winning program here>);
return 0;
}
From my understanding, this runs the programs and will not let the parent process continue until the child processes have finished. Now I'm wondering how I can terminate another child and return the winning process.