io.h File Reference

#include <stdbool.h>

Include dependency graph for io.h:

Functions
unsigned char	arch_getchar (bool blocking)
void	arch_screen_putchar (char c)
void	arch_serial_putchar (char c)

Detailed Description

Architecture-specific code for input/output. Currently, "input" and "output" are not well-defined, although the functions listed below should be used exclusively by the kernel. Input should be "the thing that sends characters typed by a human to the kernel" and output should be "the thing that sends characters from the kernel to a human".

Function Documentation

arch_getchar()

unsigned char arch_getchar

(

bool

blocking

)

Reads a character from an input.

Parameters

blocking

whether the call to this function should wait for a character or not

Returns

a character

arch_screen_putchar()

void arch_screen_putchar

(

char

c

)

Prints a character to the screen. This function might be a no-op on headless boards.

Parameters

c	the character to print

arch_serial_putchar()

void arch_serial_putchar

(

char

c

)

Prints a character to a serial line.

Parameters

c	the character to print