It wouldn't be like that. It would be something like
fd = open("file", O_RDONLY);
/* maybe fseek(fd, ...); or something else here */
do {
sent = sendfile(outfd, fd, bytes, flags);
if (sent <= 0)
break;
bytes -= sent;
} while (bytes);
..
so it would work more like a "read()+write()" combination rather than
anything else.
The way I'd implement it at least the first cut would have the rule that
you can only send from a file that can be in the page cache - so you could
have a source that is ext2 or NFS for example, but you couldn't have a
socket as the source because the data for a socket isn't in the page
cache. Thus "sendFILE()", not "copyfd()".
The destination would be arbitrary, so you could send to sockets or to
other files or whatever.
The nice thing is that I suspect I can implement this (cleanly) in a
weekend if I just were to have a free weekend somewhere ;)
Linus
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