linux send sigusr1 signal from parent to kid

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>

int done;

void handleSigusr1() {
    puts("Received SIGUSR1");
    done = 1;
}

void kidProc() {
    struct sigaction sa;
    memset(&sa, 0, sizeof(struct sigaction));
    sa.sa_handler = &handleSigusr1;
    if (sigaction(SIGUSR1, &sa, NULL)) {
        perror("sigaction");
        exit(1);
    }
    while (!done) sleep(1);
}

int main(int argc, char *argv[]) {
    pid_t pid = fork();
    if (pid == -1) {
        perror("");
        exit(-1);
    }
    if (pid == 0) {//kid
        kidProc();
        exit(0);
    }
    sleep(2);
    kill(pid, SIGUSR1);
    int stat;
    wait(&stat);
    return 0;
}