I installed the pcap library on my linux system but when including it I get the errors
/usr/include/pcap/bpf.h:88:1: error: unknown type name ‘u_int’
/usr/include/pcap/bpf.h:108:2: error: unknown type name ‘u_int’
/usr/include/pcap/bpf.h:1260:2: error: unknown type name ‘u_short’
/usr/include/pcap/bpf.h:1261:2: error: unknown type name ‘u_char’
/usr/include/pcap/bpf.h:1262:2: error: unknown type name ‘u_char’
In file included from ../src/test.c:1:0:
/usr/include/pcap/pcap.h:125:2: error: unknown type name ‘u_short’
/usr/include/pcap/pcap.h:126:2: error: unknown type name ‘u_short’
/usr/include/pcap/pcap.h:171:2: error: unknown type name ‘u_int’
...
make: *** [src/test.o] Error 1
I included
#include <pcap/pcap.h>
#include <sys/types.h>
#include <pcap-bpf.h>
in the program, what am I missing?
Make sure you do NOT define any of:
__STRICT_ANSI___ISOC99_SOURCE_POSIX_SOURCE_POSIX_C_SOURCE_XOPEN_SOURCE_SVID_SOURCE
when building your program; they may prevent the BSD data types, such as the ones the compile is complaining about, from being defined.
Try adding
-D_BSD_SOURCE
az a CFLAG to your Makefile.
来源：https://stackoverflow.com/questions/15393905/c-pcap-library-unknown-types-error