Date: Thu, 9 Jul 1998 15:31:46 -0700 (PDT) From: cts@internetcds.com To: freebsd-gnats-submit@FreeBSD.ORG Subject: misc/7229: /usr/include/pcap*.h isn't C++ safe. Message-ID: <199807092231.PAA06998@hub.freebsd.org>
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>Number: 7229
>Category: misc
>Synopsis: /usr/include/pcap*.h isn't C++ safe.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Jul 9 15:40:01 PDT 1998
>Last-Modified:
>Originator: Craig Spannring
>Organization:
InternetCDS
>Release: 2.2.6 and 3.0
>Environment:
FreeBSD backmaster.cdsnet.net 3.0-CURRENT FreeBSD 3.0-CURRENT #2: Tue May 5 20:30:34 PDT 1998 root@backmaster.cdsnet.net:/n/FreeBSD/3.0-back2/src/sys/compile/BACK2 i386
>Description:
None of the header files for the packet capture library
are suitable to include in a C++ file. They are missing the
#ifdef __cplusplus
extern "C" {
#endif
to give the declared functions C linkage
>How-To-Repeat:
Trying to compile this-
#include <iostream.h>
#include <pcap.h>
main(int argc, char **argv)
{
pcap_t *cap = NULL;
char errorBuf[4096];
cap = pcap_open_offline(argv[1], errorBuf);
if (cap == NULL)
{
cout << "Error- " << errorBuf << endl;
exit(1);
}
}
as a C++ program will give this error-
c++ tcpdump.cxx
/var/tmp/ccR273601.o: Undefined symbol `_pcap_open_offline__FPcT0' referenced from text segment
>Fix:
Add the
#ifdef __cplusplus
extern "C" {
#endif
incantation to the begining of each of the pcap*.h files.
>Audit-Trail:
>Unformatted:
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