void parameter on functions of arity 0

src/io/kbd/ps2.h

@@ -7,7 +7,7 @@
 #ifndef PS2_H
 #define PS2_H
 
-void keyboard_handler();
+void keyboard_handler(void);
 
 #define SHIFT_PRESSED_BIT 0b00000001
 #define ALT_PRESSED_BIT   0b00000010

src/io/serial/serial.h

@@ -13,7 +13,7 @@
 void outb(int port, unsigned char data);
 unsigned char inb(int port);
 
-int serial_init();
+int serial_init(void);
 void skputs(const char* str);
 void skputc(char c);
 

src/io/term/term.h

@@ -9,6 +9,6 @@
 
 void kputs(const char* str);
 void _putchar(char character);
-void term_init();
+void term_init(void);
 
 #endif