ANSI std C89/99 to send kill signals using system

send_sig.c

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

void send_sig(int pid, int sig)
{
    char exec_str[128];
    sprintf(exec_str, "kill -%d %d >/dev/null 2>&1", sig, pid);
    int result = WEXITSTATUS(system(exec_str));
    if (result == 127)
        puts("Failed to send signal to process");                                                                                                                                             
    else if (result == 1)
        puts("No such process");
    else if (result == 0)
        puts("Success");
}

void main(void)
{
    int pid = getpid();
    send_sig(pid, 9);
}