problems with postmaster

Hi all!
I couldn't find a way to make my DB server work again.
I did this:
in postgres user  killall -9 postmaster (I wanted to stop the server)
then  rm /tmp/.s.PGSQL.5432

I tried to restart the server but I got this error:
[postgres@aux-209-217-53-170 postgres]$ postmaster -D /usr/local/pgsql/data/
IpcMemoryCreate: shmget failed (Identifier removed) key=5432010, size=144,
permi
ssion=700
This type of error is usually caused by an improper
shared memory or System V IPC semaphore configuration.
For more information, see the FAQ and platform-specific
FAQ's in the source directory pgsql/doc or on our
web site at http://www.postgresql.org.
IpcMemoryIdGet: shmget failed (Identifier removed) key=5432010, size=144,
permis
sion=0
IpcMemoryAttach: shmat failed (Invalid argument) id=-2
FATAL 1:  AttachSLockMemory: could not attach segment      


What I can do?? Help me please!

Thank you for your replys, also I want to know how to stop a pg server that is
running in the background.

Rocael.

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