NAME

hpib_ppoll_resp_ctl() − define interface parallel poll response

SYNOPSIS

#include <dvio.h>

int hpib_ppoll_resp_ctl(int eid, int response);

DESCRIPTION

hpib_ppoll_resp_ctl() defines a response to be sent when an active controller performs a parallel poll on an HP-IB interface.  eid is an entity identifier of an open HP-IB raw bus device file, obtained from an open(), dup(), fcntl(), or creat() call. 

The value of response indicates whether this computer does or does not need service.  A non-zero response value indicates that service is required.  This statement only sets up a potential response; no actual response is generated when the statement is executed.  The sense of the response and the line number to respond on are set by hpib_card_ppoll_resp() (see hpib_card_ppoll_resp(3I)) or by the active controller.

RETURN VALUE

hpib_ppoll_resp_ctl() returns 0 if the response is successfully set, or −1 if an error has occured. 

ERRORS

hpib_ppoll_resp_ctl() fails under the following situations, and sets errno (see errno(2)) to the value in square brackets:

[EBADF] eid does not refer to an open file. 

[ENOTTY] eid does not refer to a raw HP-IB device file. 

[EACCES] The interface associated with this eid is locked by another process and O_NDELAY is set for this eid (see io_lock(3I)). 

AUTHOR

hpib_ppoll_resp_ctl() was developed by HP. 

SEE ALSO

hpib_ppoll(3I), hpib_card_ppoll_resp(3I)

Hewlett-Packard Company  —  HP-UX Release 9.0: August 1992