simple UDP receiver in C using libuv from node.js platform

uv1.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "uv.h"

// uv1.c
// compile with : gcc -o uv1 -I libuv/include -Wall uv1.c libuv/uv.a -lpthread -lm -lrt

#define CHECK(r, msg) \
  if (r) { \
    uv_err_t err = uv_last_error(uv_loop); \
    fprintf(stderr, "%s: %s\n", msg, uv_strerror(err)); \
    exit(1); \
  }
  
static uv_loop_t *uv_loop;
static uv_udp_t   server;

void on_recv(uv_udp_t* handle, ssize_t nread, uv_buf_t buf,struct sockaddr* addr, unsigned flags)
{
	if (nread > 0) {
		printf("%lu\n",nread);
		printf("%s",buf.base);
	}
	printf("free  :%lu %p\n",buf.len,buf.base);
	free(buf.base);
}

uv_buf_t on_alloc(uv_handle_t* client, size_t suggested_size)
{
	uv_buf_t buf;
	buf.base = malloc(suggested_size);
	buf.len = suggested_size;
	printf("malloc:%lu %p\n",buf.len,buf.base);
	return buf;
}

int main(int argc,char *argv[])
{
	int status;
	struct sockaddr_in addr;
	uv_loop = uv_default_loop();
	
	status = uv_udp_init(uv_loop,&server);
	CHECK(status,"init");
	
	addr = uv_ip4_addr("0.0.0.0", 11000);
	
	status = uv_udp_bind(&server,addr,0);
	CHECK(status,"bind");
	
	status = uv_udp_recv_start(&server, on_alloc,on_recv);
	CHECK(status,"recv");
	
	uv_run(uv_loop);
	
	return 0;
}

I borrowed the 'CHECK' macro from https://gist.github.com/1195428 by utaal.

Please use calloc(1, suggested_size) instead of malloc(suggested_size) or you'll risk security and stability issue due to unterminated string