Simple UDP Server

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>

extern int h_errno;

void error(const char *msg);

int UdpSocket(int protocol)
{
 int sockfd;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 if (-1 == sockfd)
 {
  error(__func__);
 }
 return sockfd;
}


void error(const char *msg)
{
 printf("Error Code: %d", errno);
 perror(msg);
}


int BindSocketToAddr(int sock, struct sockaddr_in *addr, int port)
{
 int rc;

    if (!addr)
    {
        printf("%s: NULL pointer in addr\n", __func__);
        return -1;
    }
 bzero(addr, sizeof(struct sockaddr_in));
 addr->sin_family = AF_INET;
 addr->sin_addr.s_addr = INADDR_ANY;
 addr->sin_port = htons(port);
 rc = bind(sock, (struct sockaddr *)addr, sizeof(struct sockaddr));
 if (rc < 0)
 {
  perror(__func__);
 }
    return rc;
}



int main(int argc, char **argv)
{
 int sockfd;
 struct sockaddr_in fromSockAddr;
 struct sockaddr_in serverSockAddr;
 socklen_t fromlen;
 char buf[1024];
 char fromAddrStr[512];
 int n;

    if (argc < 2)
    {
        printf("\n%s <PORT NUMBER>\n\n", argv[0]);
        exit(0);
    }
    setuid(0);

 printf("UDP Server\n");

 sockfd = UdpSocket(0);
 if (sockfd > 0)
 {
  BindSocketToAddr(sockfd, &serverSockAddr, atoi(argv[1]));
  fromlen = sizeof(fromSockAddr);
  while (1) {
   /* wait for client to send a message */
   n = recvfrom(sockfd, buf, sizeof(buf), 0, (struct sockaddr *)&fromSockAddr, &fromlen);
   if (n < 0)
   {
    error("recvfrom");
    break;
   }
   else {
    inet_ntop(fromSockAddr.sin_family, &fromSockAddr.sin_addr, fromAddrStr, sizeof(fromAddrStr));
    printf("GOT msg from: %s\n", fromAddrStr);
    /* echo back */
    n = sendto(sockfd, buf, n, 0, (struct sockaddr *)&fromSockAddr, sizeof(fromSockAddr));
    if (n < 0)
    {
     error("sendto");
     break;
    }
   }
  }
 }
 return 0;
}