Error starting postmaster

I am running Slackware 3.5, PostgreSQL 6.4.
I was able to start and run PostgreSQL and run the initial regression
test with only a failure in geometry and misc.
Overall it worked well.
I kill the postmaster process.

I got an error:
FATAL: StreamServerPort: bind() failed: errno=98
        Is another postmaster already running on that port?
        If not, remove socket node (/tmp/.s.PGSQL.5432) and retry

I deleted this .s.PGSQL.5432 file and am now getting this error on
startup:
IpcMemoryCreate: shmget failed (Identifier removed) key=5432010,
size=24588, per
mission=700
IpcMemoryIdGet: shmget failed (Identifier removed) key=5432010,
size=24588, perm
ission=0
IpcMemoryAttach: shmat failed (Invalid argument) id=-2
FATAL 1:  AttachSLockMemory: could not attach segment

I have also tried deleting the '/usr/local/pgsql/data' directory and
then run initdb again -- didn't work.

Any help please -- thanks greatly!
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