Get the current file offset for a savefile being written
#include <pcap/pcap.h> long pcap_dump_ftell(pcap_dumper_t *p);
pcap_dump_ftell() returns the current file position for the ``savefile'', representing the number of bytes written by pcap_dump_open() and pcap_dump(). -1 is returned on error.
pcap(3PCAP), pcap_dump_open(3PCAP), pcap_dump(3PCAP)