shmget man page on Xenix

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     SHMGET(S)		      XENIX System V		     SHMGET(S)

     Name
	  shmget - Gets a shared memory segment.

     Syntax
	  #include <sys/types.h>
	  #include <sys/ipc.h>
	  #include <sys/shm.h>

	  int shmget (key, size, shmflg)
	  key_t key;
	  int size, shmflg;

     Description
	  shmget returns the shared memory identifier associated with
	  key.

	  A shared memory identifier and an associated data structure
	  and shared memory segment of size size bytes (see intro(S))
	  are created for key if one of the following are true:

	       key is equal to IPC_PRIVATE.

	       key does not already have a shared memory identifier
	       associated with it, and (shmflg & IPC_CREAT) is
	       ``true''.

	  Upon creation, the data structure associated with the new
	  shared memory identifier is initialized as follows:

	       shm_perm.cuid, shm_perm.uid, shm_perm.cgid, and
	       shm_perm.gid are set equal to the effective user ID and
	       effective group ID, respectively, of the calling
	       process.

	       The low-order 9 bits of shm_perm.mode are set equal to
	       the low-order 9 bits of shmflg.	shm_segsz is set equal
	       to the value of size.

	       shm_lpid, shm_nattch, shm_atime, and shm_dtime are set
	       equal to 0.

	       shm_ctime is set equal to the current time.

	  shmget will fail if one or more of the following are true:

	       size is less than the system-imposed minimum or greater
	       than the system-imposed maximum.	 The minimum for 286
	       processes is 1 byte, and the maximum is 64K or 65535
	       bytes. The minimum and maximum for 386 processes are
	       configurable.  [EINVAL]

	       A shared memory identifier exists for key but operation

     Page 1					      (printed 8/7/87)

     SHMGET(S)		      XENIX System V		     SHMGET(S)

	       permission (see intro(S)) as specified by the low-order
	       9 bits of shmflg would not be granted. [EACCES]

	       A shared memory identifier exists for key but the size
	       of the segment associated with it is less than size,
	       which cannot be equal to zero.  [EINVAL]

	       A shared memory identifier does not exist for key and
	       (shmflg & IPC_CREAT) is ``false''.  [ENOENT]

	       A shared memory identifier is to be created but the
	       system-imposed limit on the maximum number of allowed
	       shared memory identifiers system wide would be
	       exceeded.  [ENOSPC]

	       A shared memory identifier and associated shared memory
	       segment are to be created but the amount of available
	       physical memory is not sufficient to fill the request.
	       [ENOMEM]

	       A shared memory identifier exists for key but ( (shmflg
	       & IPC_CREAT) and (shmflg & IPC_EXCL) ) is ``true''.  -
	       [EEXIST]

     Return Value
	  Upon successful completion, a non-negative integer, namely a
	  shared memory identifier, is returned.  Otherwise, a value
	  of -1 is returned and errno is set to indicate the error.

     See Also
	  intro(S), shmctl(S), shmop(S)

     Notes
	  Programs using this function must be compiled with -Me
	  compiler option.

     Page 2					      (printed 8/7/87)

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