Hi,
The changelog for libpcap 0.7.1 seems to indicate that pcap_compile is
reentrant. I tested it on a RH 7.2 box (2.4.18-5 kernel,
glibc-2.2.5-39) and found it segfaulting about half the time when
using pthreads. Is this a known issue? How much of libpcap isn't
thread safe? I'm most concerned with pcap_dispatch...
Thanks,
david
---segfaulting program----
#include <pthread.h>
#include <stdio.h>
#include <pcap.h>
pcap_t *p;
bpf_u_int32 mask;
bpf_u_int32 net;
void *foo(void *null)
{
char perr[PCAP_ERRBUF_SIZE];
char textfilter[1024];
struct bpf_program filter;
printf("Thread %d starting\n", pthread_self());
sprintf(textfilter, "tcp and port %d\n", pthread_self() & 0xffff);
pcap_compile(p, &filter, textfilter, 1, net);
printf("Thread %d ending\n", pthread_self());
fflush(stdout);
}
void main()
{
pthread_t t[100];
char perr[PCAP_ERRBUF_SIZE];
int i;
p = pcap_open_live("eth0", 1600, 1, 0, perr);
if(p == NULL){
printf("%s\n", perr);
}
pcap_lookupnet("eth0", &net, &mask, perr);
for(i = 0; i< 100; i++){
if(pthread_create(&(t[i]), NULL, foo, NULL) != 0){
perror("pthread_create()\n");
}
}
for(i = 0; i < 100; i++){
pthread_join(t[i], NULL);
}
printf("DONE\n");
}
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