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SYSTEM CALL: shmctl();
PROTOTYPE: int shmctl ( int shmqid, int cmd, struct shmid_ds *buf );
RETURNS: 0 on success
-1 on error: errno = EACCES (No read permission and cmd is IPC_STAT)
EFAULT (Address pointed to by buf is invalid with IPC_SET and
IPC_STAT commands)
EIDRM (Segment was removed during retrieval)
EINVAL (shmqid invalid)
EPERM (IPC_SET or IPC_RMID command was issued, but
calling process does not have write (alter)
access to the segment)
NOTES:
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LAST UPDATE Nov 28,1997
Created Nov 28,1997