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You can't do it like that (because the order of function argument evaluation is unspecified).
Instead, try this:


int err = fsync(rr->sock);
printf("%i %i - %s\n", err, errno, strerror(errno));...

Try putting an fsync call after your send call:


send(rr->sock, "text", 4, 0);
fsync(rr->sock);

You should, of course, be checking the return values for an error condition.

EDIT: I should...