Wireshark-dev: [Wireshark-dev] request help for packet capture using libpcap

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#include <unistd.h>
#include <stdio.h>
#include <pcap.h>
#include <netinet/in.h>
#include <sys/socket.h>

#define IFSZ 16
#define FLTRSZ 120
#define MAXHOSTSZ 256
#define PCAP_SAVEFILE "./pcap_savefile"

void my_callback(u_char *args, const struct pcap_pkthdr * pkthdr, const u_char* packet){
printf("Welcome ... \n");
}

int main(){

pcap_t *p;               /* packet capture descriptor */
pcap_dumper_t *pd;       /* pointer to the dump file */
char filename[80];       /* name of savefile for dumping packet data */
int count = 20;          /* number of packets to capture */
pcap_if_t *alldevs;
char *err_str, *err_buf;
int n=0;
char * ifname1;

strcpy(filename,PCAP_SAVEFILE);

ifname1 = pcap_lookupdev(err_buf);
p =  pcap_open_live(ifname1, 65545, 0, 1000, err_buf);
pd = pcap_dump_open(p,filename);

pcap_loop(p,100,my_callback,(char *)pd);

pcap_dump_close(pd);
pcap_close(p);

return 0;
}