como ejecutar pcp_recovery_node -h 192.168.1.48 -p 9898 -U pgpool -n 1 sin contraseña

const char *cmd = "pcp_recovery_node -h 192.168.1.48 -p 9898 -U pgpool -n 1";
int wstatus;
pid_t pid;

pid = fork();
if (pid == 0) {
    execl("/bin/sh", "sh", "-c", cmd, (char *)0);
    exit(127); /* only if execv fails */
} else {
    waitpid(pid, &wstatus, 0);
    if (WIFEXITED(wstatus)) {
        printf("exit status %d\n", WEXITSTATUS(wstatus));
    }
}