K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2013-12-17T17:28:02.217993Z
K 7
svn:log
V 277
Do not allow O_EXEC opens for fifo, return EINVAL.

Besides not making sense, open(O_EXEC) for fifo creates fifoinfo with
zero readers and writers counts, which causes premature free of pipes.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END