* Does select (for write) work on PACKET_SOCKETs ?
@ 2001-06-26 22:00 Ben Greear
0 siblings, 0 replies; only message in thread
From: Ben Greear @ 2001-06-26 22:00 UTC (permalink / raw)
To: linux-net, linux-kernel
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
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2001-06-26 22:00 Does select (for write) work on PACKET_SOCKETs ? Ben Greear
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