lkml.org 
[lkml]   [2001]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectDoes select (for write) work on PACKET_SOCKETs ?
It does not seem to work for me like I want it to.  Basically,
it seems that it always takes the entire timeout (50-80 ms in my
case), but at least the socket descriptor is SET when select returns. I want
it to return as soon as the socket is writable, which at low (56kbps)
speed on a 100bt NIC should be immediate, or certainly less than 50ms.

I'm using kernel 2.4.6-pre3 with RH 7.1.

Here is a snippet of code that does the socket creation (I am binding in this case.):

int createPacketSocket(const char* dev_name, int ether_type, int dev_idx, int should_bind) {
LF_TRC_IN;
VLOG << "dev_name -:" << dev_name << ":- dev_idx: " << dev_idx
<< " type (decimal): " << ether_type << endl;

int s = socket(PF_PACKET, SOCK_RAW, htons(ether_type));
int r; //retval

if (s < 0) {
cerr << "ERROR: socket: " << strerror(errno) << endl;
VLOG << "ERROR: socket: " << strerror(errno) << endl;
return s;
}

if (should_bind) {
struct sockaddr_ll myaddr;

memset(&myaddr, '\0', sizeof(myaddr));
myaddr.sll_family = AF_PACKET;
myaddr.sll_protocol = htons(ether_type);
myaddr.sll_ifindex = dev_idx;
//strcpy(myaddr.sa_data, dev_name);

r = bind(s, (struct sockaddr*)(&myaddr), sizeof(myaddr));
if (r < 0) {
cerr << "ERROR: bind: " << strerror(errno) << endl;
VLOG << "ERROR: bind: " << strerror(errno) << endl;
return r;
}
}

nonblock(s);
return s;
}


Any ideas?

Thanks,
Ben

--
Ben Greear <greearb@candelatech.com> <Ben_Greear@excite.com>
President of Candela Technologies Inc http://www.candelatech.com
ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:55    [W:0.025 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site