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use pcap_breakloop()

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This commit is contained in:
wangyu- 2018-11-13 00:03:35 -06:00
parent 001c42be56
commit d24c96a400
1 changed files with 31 additions and 7 deletions
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38
network.cpp
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@ -327,10 +327,15 @@ void *pcap_recv_thread_entry(void *none)
while(1)
{
pthread_mutex_lock(&pcap_mutex);
int ret=pcap_loop(pcap_handle, 0, my_packet_handler, NULL);
int ret=pcap_loop(pcap_handle, -1, my_packet_handler, NULL); //use -1 instead of 0 as cnt, since 0 is undefined in old versions
pthread_mutex_unlock(&pcap_mutex);
mylog(log_warn,"pcap_loop exited with value %d\n",ret);
sleep(5);
if(ret==-1)
mylog(log_warn,"pcap_loop exited with value %d\n",ret);
else
{
mylog(log_debug,"pcap_loop exited with value %d\n",ret);
}
sleep(1);
//myexit(-1);
}
/*
@ -831,7 +836,26 @@ void init_filter(int port)
mylog(log_info,"filter expression is [%s]\n",filter_exp);
pthread_mutex_lock(&pcap_mutex);//not sure if mutex is needed here
//pthread_mutex_lock(&pcap_mutex);//not sure if mutex is needed here
long long tmp_cnt=0;
while(pthread_mutex_trylock(&pcap_mutex)!=0)
{
tmp_cnt++;
pcap_breakloop(pcap_handle);
if(tmp_cnt%500==0)
{
mylog(log_warn,"%lld attempts of pcap_breakloop()\n", tmp_cnt);
if(tmp_cnt>5000)
{
mylog(log_fatal,"we might have already run into a deadlock\n");
}
}
ev_sleep(0.001);
}
mylog(log_warn,"breakloop() succeed after %lld attempt(s)\n", tmp_cnt);
pcap_setdirection(pcap_handle,PCAP_D_IN);
@ -1250,15 +1274,15 @@ int send_raw_packet(raw_info_t &raw_info,const char * packet,int len)
assert(pcap_link_header_len!=-1);
memcpy(buf,pcap_header_buf,pcap_link_header_len);
memcpy(buf+pcap_link_header_len,packet,len);
pthread_mutex_lock(&pcap_mutex);
//pthread_mutex_lock(&pcap_mutex); looks like this is not necessary, and it harms performance
int ret=pcap_sendpacket(pcap_handle,(const unsigned char *)buf,len+pcap_link_header_len);
if(ret!=0)
{
mylog(log_fatal,"pcap_sendpcaket failed with vaule %d,%s\n",ret,pcap_geterr(pcap_handle));
pthread_mutex_unlock(&pcap_mutex);
//pthread_mutex_unlock(&pcap_mutex);
myexit(-1);
}
pthread_mutex_unlock(&pcap_mutex);
//pthread_mutex_unlock(&pcap_mutex);
/*
unsigned char *p=(unsigned char *)send_raw_ip_buf0;
for(int i=0;i<ip_tot_len+pcap_link_header_len;i++)