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libemcast API
by David Helder
Copyright (C) 2001 Regents of the University of Michigan
============================================================
IN PROGRESS. See libemcast.h and libemcast.c. It's not complex.
Creating, joining, leaving
--------------------------
int emcast_join (Emcast** emcastp, const char* url);
int emcast_leave (Emcast* emcast);
To do async reads, select on return value of join. Assume
(optimisticly) that writes don't block.
Sending and receiving
---------------------
int emcast_send (Emcast* emcast, const char* buf, size_t len);
int emcast_recv (Emcast* emcast, char* buf, size_t len);
int emcast_recvfrom (Emcast* emcast, char* buf, int len,
void* from, size_t* fromlen);
Setting and getting options
---------------------------
int emcast_setopt (Emcast* emcast, const char* optname,
const void* optval, size_t optlen);
int emcast_getopt (Emcast* emcast, const char* optname,
void* optval, size_t* optlen);
Emcast errors
-------------
char* emcast_strerror (int errnum);
Most functions return 0 on success or a non-zero error number on
failure. This error number may be positive or negative (see the
documentation for the particular function). The error number can be
converted to a constant string using emcast_strerror.
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