unix file system - file descriptor flags?

i'm reading stevens' "advanced programming in the unix environment" book and don't get a part about file descriptor flags.

i've found the page i'm talking about on the net so here it is: http://www.informit.com/content/art...7FBD87AF8C04%7D

the part i don't understand is talked about in the 3 points at the top of that page and shown in the first figure you come to - figure 3.2

point 1a is 'the file descriptor flags'

and point 2a is 'the file status flags for the file (read, write, append, sync, nonblocking etc.)'

are the file descriptor flags (1a) the same things duplicated in the file table (2a)? or not? and if not, what are the file descriptor flags (1a)? (i understand what the file status flags (2a) are, it's the file descriptor flags (1a) i don't get)

thanks.

i've found out the answer to this. file descriptor flags are not the same as file status flags. there is only one file descriptor flag at the moment (that was written in 1992 but still seems to be correct) :
FD_CLOEXEC : When this flag is clear, the file remains open across spawn*() or exec*() calls; else the file is closed.