out8()

Write an 8-bit value to a port

Synopsis:

#include <hw/inout.h>

void out8( uintptr_t port, 
           uint8_t val );

Arguments:

port: The port you want to write the value to.
val: The value that you want to write.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The out8() function writes an 8-bit value, specified by val, to the specified port.

The calling process must use mmap_device_io() to access the device's I/O registers.

On x86 and x86_64 targets, the process must have the PROCMGR_AID_IO ability enabled, and the calling thread must have I/O privileges, or else it will fault with a SIGSEGV; see procmgr_ability(), and the ThreadCtl() _NTO_TCTL_IO command.

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes