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select(2)'ing a datagram socket

Posted on 2002-07-26
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Last Modified: 2012-06-27
See title... it doesnt seem to work (linux 2.4.18)
Strace looks like:

socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 8
setsockopt(8, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
bind(8, {sin_family=AF_INET, sin_port=htons(1029), sin_addr=inet_addr("0.0.0.0")}}, 16) = 0
fcntl64(8, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
select(9, [3 4 5 6 7 8], [], [], {1, 0}) = 1 (in [8], left {0, 220000})
getsockopt(8, SOL_IP, 0x50 /* IP_??? */, 0xbffff65c, 0xbffff648) = -1 ENOPROTOOPT (Protocol not available)
close(8)                                = 0
select(9, [3 4 5 6 7 8], [], [], {1, 0}) = -1 EBADF (Bad file descriptor)

My question is: Is this at all possible? If yes, how (what options)? If no, how should i do this considering i'm already select()'ing tcp ports (which works fine). Is there a generic way (for both stream and dgram) to do this?
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Question by:m00
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2 Comments
 

Author Comment

by:m00
ID: 7180905
Oops, its not the select() of course, the problem is getsockopt.. maybe somebody can give me a clue why
getsockopt(fd, SOL_IP, SO_ORIGINAL_DST, sa, salen) wouldnt work there then.. :/
datagram socket have a destination surely?
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bryanh earned 300 total points
ID: 7181258
> datagram socket have a destination surely?

No, that's what it means to be a datagram socket.  You can send to anywhere at any time through it (or receive from anywhere at any time through it).
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