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Message-Id: <199807092231.PAA06998@hub.freebsd.org>
Date: Thu, 9 Jul 1998 15:31:46 -0700 (PDT)
From: cts@internetcds.com
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: misc/7229: /usr/include/pcap*.h isn't C++ safe.
Sender: owner-freebsd-bugs@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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