[LTP] syscalls: Add epoll_create03

[Cyril Hrubis]

Hi!
> --- [PATCH 7/9] ---
> 
> > 	rval = poll(fds, nfds, timeout);
> > 	if (rval == -1) {
> > 		tst_brk_(file, lineno, TBROK | TERRNO,
> > 			"poll(%p, %li, %i) failed", fds, (long)nfds, timeout);
> > 	} else if (rval < -1) {
> > 		tst_brk_(file, lineno, TBROK | TERRNO,
> > 			"Invalid poll(%p, %li, %i) return value %i",
> > 			fds, (long)nfds, timeout, rval);
> > 	}
> 
> poll() returns -1 on error or >= 0 on success; it cannot return a
> value less than -1. The else-if branch is dead code.
> 
> The nearby safe_statvfs() uses "else if (rval)" to catch unexpected
> non-zero returns for a function that is 0 on success. poll() returns
> 0 (timeout) and positive values (events ready) as normal outcomes, so
> no such secondary check applies here. The body should just have the
> rval == -1 guard and return rval.

I will ignore this one since we are guarding againts kernel bugs with
this code. I.e. if kernel returns impossible value we want the test to
report it.

-- 
Cyril Hrubis
chrubis@suse.cz