i am (still) working on a program to receive ethernet-frames:
when i use recvfrom on the packet socket (SOCK_PACKET), i always get the
error EBADF (Bad file number) _after_ the first packet has been
_successfully_ received. the next call to recvfrom in the while loop causes
the error.
when i try it with recvmsg, it works fine, but i wonder why it doesn't work
with recvfrom.
anyhow, i don't really understand the concept of the iovec struct of
recvmsg. why would i want to have a buffer array for the one ethernet-frame
i can receive at a time?
i would greatly appreciate any explanations.
thanks,
Br1
this is the code with recvfrom:
while (1) /* forever */
{
len = recvfrom( s, buff, ETH_FRAME_LEN, 0, &sa, &salen );
/* stripped error checking code */
printf("received packet (len: %d, type: %X, dev: %s)\n", len,
sa.sa_family, sa.sa_data);
}
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The facts, although interesting, are irrelevant.
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