NAME

gpio_get_status − return status lines of GPIO card

SYNOPSIS

int gpio_get_status (eid)
int eid;

HP-UX COMPATIBILITY

Level: Device I/O Library − HP-UX/EXTENDED

Origin: HP

DESCRIPTION

Gpio_get_status enables you to read the status  register of the GPIO interface associated with the entity ID, eid.  Eid is an entity identifier of an open GPIO device file obtained from an open(2), dup(2), fcntl(2), or creat(2).  The current state of each status line on the interface  card is mapped to the value returned, with STS0 mapped to the least significant bit.  Only x least  significant bits are used, where x is the  number  of  status  lines   available  on  the  hardware interface being used. 

HARDWARE DEPENDENCIES

Series 500:
For the current GPIO card, x is 2. 

RETURN VALUE

Gpio_get_status returns the value of the status register of the GPIO  interface  associated  with eid, and −1 if an error  was encountered. 

DIAGNOSTICS

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

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

eid does not refer to a GPIO device file [ENOTTY]. 

Hewlett-Packard  —  last mod. May 11, 2021