libpcap中的平臺無關性之條件編譯

#ifndef lib_pcap_pcap_h
#define lib_pcap_pcap_h
#if defined(WIN32)
   #include <pcap-stdinc.h>
#elif defined(MSDOS)
   #include <sys/types.h>
   #include <sys/socket.h>
#elif 
   #include <sys/types.h>
   #include <sys/time.h>
#endif

#ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H
   #include <pcap/bpf.h>
#endif

#include <stdio.h>
#ifdef __cplusplus
#extern "C" {
#endif 

....
#ifdef __cplusplus
}
#endif
#endif