BUG #6664: Postgres server process does not come up in foreground and parent process is set to init ( PID 1 )

The following bug has been logged on the website:

Bug reference: 6664
Logged by: Karthik Ananth
Email address: karthik(dot)jcecs(at)gmail(dot)com
PostgreSQL version: 9.0.7
Operating system: Freebsd 8.2, Freebsd 7.2
Description:

As per the documentation by default postgres server should run in
foreground. I am referring to this link -
http://www.postgresql.org/docs/9.0/static/server-start.html

But what I have observed is, it is not happening and the command returns
immediately. Below is the transcript -

c670e04:rkananth 16] /usr/local/bin/postgres --version
postgres (PostgreSQL) 9.0.7

c670e04:rkananth 11] postgres -D /data/db/postgres
c670e04:rkananth 12] ps -A | grep post
65165 ?? Ss 0:00.01 /usr/local/bin/postgres
65167 ?? Ss 0:00.00 postgres: writer process (postgres)
65168 ?? Ss 0:00.00 postgres: wal writer process (postgres)
65169 ?? Ss 0:00.00 postgres: autovacuum launcher process
(postgres)
65170 ?? Ss 0:00.00 postgres: stats collector process (postgres)
65224 0 S+ 0:00.00 grep post

c670e04:rkananth 14] ps -p 65165 -o ppid
PPID
1

c670e04:rkananth 15] ps 1
PID TT STAT TIME COMMAND
1 ?? SLs 0:00.17 /sbin/init --

Further information:
Also found in v8.3.7
Not found in v7.4.2
( Same OS )

I would be happy to provide further information if required.