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/usr/lib/iraf/unix/hlib/libc/alloc.h is in iraf-dev 2.16.1+2018.03.10-2.

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/* ALLOC.H -- Status returns for ZDVALL, ZDVOWN.
 */
#define DV_DEVFREE	1	/* device is free and can be allocated	*/
#define DV_DEVALLOC	2	/* device is already allocated		*/
#define DV_DEVINUSE	3	/* device is in use by someone else	*/
#define	DV_ERROR	9	/* software error from alloc.e		*/

#define	D_alloc