nshmget man page on DigitalUNIX

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nshmget(3)							    nshmget(3)

       nshmget	- Returns (or creates) the ID for a shared memory region (lib‐
       numa library)

       #include <numa.h> #include <sys/shm.h>

       int nshmget(
	       key_t key,
	       size_t size,
	       int shmflg,
	       memalloc_attr_t *attr );

       Specifies the key that identifies the shared memory region.  The	 value
       for  the key parameter can be IPC_PRIVATE or a random number other than
       zero (0). If the value of key is IPC_PRIVATE, it can be used to	assure
       the  return of a new, unused shared memory region.  Specifies the mini‐
       mum number of bytes to allocate for the region.	Specifies the creation
       flags.  See  shmget(2)  for  a description of these flags.  Points to a
       memory allocation policy and attributes structure. If the specified key
       does not exist, and a shared memory region is created, these attributes
       will be assigned to the memory object created to manage the shared mem‐
       ory region.

       If  the	attr  argument is NULL, the nshmget() function behaves identi‐
       cally to the shmget() function.

       If the attr argument is non-NULL, it points to a memory allocation pol‐
       icy  and	 attributes structure that specifies where the pages should be
       allocated for a newly created shared memory region. To change the  pol‐
       icy of an existing shared memory region, use the nmadvise() function.

       If  the	mattr_policy  member  of  the  structure pointed to by attr is
       MPOL_DIRECTED and the mattr_rad member is  RAD_NONE,  the  system  will
       choose the Resource Affinity Domain (RAD) where the pages of the shared
       memory region will be allocated from among the RADs  specified  in  the
       mattr_radset  member of *attr.  If the mattr_radset member is the empty
       set, the system will select a RAD for the memory object from among  all
       of the RADs in the caller's partition, and the overflow set will be the
       empty set.

       Success.	 Failure. In this case, errno is set to indicate the error.

       The nshmget() function returns errors for all the conditions  that  are
       documented for the shmget() function.  In addition, the nshmget() func‐
       tion sets errno for the following: A non-NULL attr argument  points  to
       an invalid address.  The structure pointed to by the attr argument con‐
       tains an invalid memory allocation policy or  an	 invalid  RAD  number.
       (The  RAD  number is less than 0 or greater than nrads.) This error can
       also occur if the memory allocation policy  is  MPOL_STRIPED,  but  the
       specified stride (stripe width) is 0 pages.

       Functions: shmget(2), nmadvise(3), numa_intro(3)

       Files: numa_types(4), shmid_ds(4)


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