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Date: Wed, 31 Oct 2001 14:33:35 +1100 (EST)
From: Edwin Groothuis <edwin@mavetju.org>
Reply-To: Edwin Groothuis <edwin@mavetju.org>
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Subject: bin/31649: libpcap doesn't work with -pthread
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>Number:         31649
>Category:       bin
>Synopsis:       libpcap doesn't work with -pthread
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 30 19:40:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Edwin Groothuis
>Release:        FreeBSD 4.4-RELEASE i386
>Organization:
-
>Environment:
System: FreeBSD k7.mavetju.org 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Thu Oct 4 08:49:05 EST 2001 edwin@k7.mavetju.org:/usr/src/sys/compile/k7 i386

A normal 4.4 machine, build from the distribution cdrom

>Description:

When compiling a program which listens to a network device via the
pcap-library with -pthread, it stops working in the pcap_loop()
bits.

>How-To-Repeat:

#include <pcap.h>
#include <net/bpf.h>

#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>

pcap_t *pd = NULL;
char *dev = "fxp0";
int link_offset;
int link_type;
int snaplen = 65535, promisc = 1, to = 1000;
char pc_err[PCAP_ERRBUF_SIZE];

void networkinit(void) {
    if ((pd = pcap_open_live(dev, snaplen, promisc, to, pc_err)) == NULL) {
        perror(pc_err);
        exit(-1);
    }
}

void process(u_char *data1, struct pcap_pkthdr* h, u_char *p) {
    fprintf(stderr,".");
}

void networkrun(void) {
    while (pcap_loop(pd, 0, (pcap_handler)process, 0));

    exit(-2);
}
    
int main(void) {
    networkinit();
    networkrun();
}


(You might have to tweak the fxp0 in the dev-variable)

Compile as "gcc -Wall -o nw nw.c -lpcap". It will print a dot for
every IP packet.
Compile as "gcc -Wall -o nw nw.c -lpcap -pthread". It will print
nothing.

>Fix:

none known.

>Release-Note:
>Audit-Trail:
>Unformatted:

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