HP C/iX Library Reference Manual (30026-90004)

Chapter 3 23

Interfacing with MPE/iX

Aoptions

Similar to the fop structure, the aop structure provides access to the aoptions used in

FOPEN. It is deﬁned as:

struct aop {

unsigned short reserved:3; /* reserved for MPE/iX */

unsigned short copy:1; /* copy open mode */

unsigned short no_wait:1; /* I/O without wait */

unsigned short multi:2; /* multi-access mode */

unsigned short no_buf:1; /* no buffering */

unsigned short exclusive:2; /* exclusive access flag */

unsigned short locking:1; /* allow locking */

unsigned short multirecord:1; /* multi-record flag */

unsigned short access:4; /* mode of access */

};

Also, a typedef that deﬁnes a union type named aoptions is provided:

typedef union {

struct aop as;

unsigned short av;

} aoptions;

If variable a is declared as being type aoptions, then a.av accesses the unsigned short

version of the aoptions while a.as accesses the structural deﬁnition of the aoptions.