Program received signal SIGSEGV, Segmentation fault.
pkt_get_timestamp (pkt=pkt@entry=0x0) at src/pkt.c:193
193     return pkt->timestamp;
(gdb) backtrace
#0  pkt_get_timestamp (pkt=pkt@entry=0x0) at src/pkt.c:193
#1  0x000055555555758f in read_write_loop (sfd=4, file=0x55555555b260) at src/read_write_loop.c:164
#2  0x0000555555556328 in main (argc=<optimized out>, argv=<optimized out>) at src/sender.c:90