SVR5

inw(D3)

inw -- read a 16 bit short word from a 16 bit I/O port

Synopsis

   #include <sys/types.h>
   #include <sys/ddi.h>
   
   ushort_t inw(int port);

Description

The inw function provides a C language interface to the machine instruction that reads a 16 bit short word from a 16 bit I/O port, using the I/O address space instead of the memory address space.

Arguments

port: A valid 16 bit I/O port.

Return values

Returns the value of the 16 bit short word read from the I/O port.

Usage

Context and synchronization

All contexts.

Hardware applicability

Intel IA-32 compatible platforms

Version applicability

ddi: 1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp

SCO OpenServer ODDI compatibility

inw(D3oddi) provides similar functionality for SCO OpenServer ODDI drivers, but note that the ODDI function is cast as an int rather than a ushort_t.

References

inb(D3), inl(D3), outb(D3), outl(D3), outw(D3), repinsb(D3), repinsd(D3), repinsw(D3), repoutsb(D3), repoutsd(D3), repoutsw(D3)

``Programmed I/O (PIO)'' in HDK Technical Reference