library/src/internal.cpp

#include "internal.h"
#include "SharedMemoryAccess.h"
#include "vkvm.h"

#include <csignal>
#include <sys/shm.h>

Impl impl;

void sendSignal(pid_t pid, int signalNumber) {
    kill(pid, signalNumber);
}

void onSignal(int signalNumber, void(*callback)(int)) {
    signal(signalNumber, callback);
}

InterruptEntry *getInterrupTable(){
    return reinterpret_cast<InterruptEntry*>(getSharedMemory() + sizeof(Registers) + impl.reservedSize);
}

Registers *getRegisters(){
    return reinterpret_cast<Registers*>(getSharedMemory());
}

char *getTextArea(){
    return ((getSharedMemory() + sizeof(Registers) + impl.reservedSize) +
    sizeof(InterruptEntry) * impl.interruptEntyCount);
}

char *getPixelArea(){
    return (((getSharedMemory() + sizeof(Registers) + impl.reservedSize) +
    sizeof(InterruptEntry) * impl.interruptEntyCount) +
    getCharactersPerRow() *  getCharactersPerColumn());
}

bool callEvent(EventType type) {
    auto ivt = getInterrupTable();
    if(ivt[type].pid != 0){
        sendSignal(ivt[type].pid, ivt[type].signum);
    }
    return true;
}

void setLayoutVersion(LayoutVersion newValue) {
    lockSharedMemory();
    getRegisters()->layout_version = newValue;
    unlockSharedMemory();
}

void setCharactersPerColumn(int newValue) {
    lockSharedMemory();
    getRegisters()->characters_per_column = newValue;
    unlockSharedMemory();
}

void setCharactersPerRow(int newValue) {
    lockSharedMemory();
    getRegisters()->characters_per_row = newValue;
    unlockSharedMemory();
}

void setMousePosition(int x, int y) {
    lockSharedMemory();
    getRegisters()->mouse_pos_x = x;
    getRegisters()->mouse_pos_y = y;
    unlockSharedMemory();
}

void buttonPressed(KeyCode keyCode) {
    lockSharedMemory();
    auto reg = getRegisters();
    if(reg->keyboardBuffer_index_write == sizeof(reg->keyboardBuffer)){
        reg->keyboardBuffer_index_write = 0;
    }
    reg->keyboardBuffer[reg->keyboardBuffer_index_write++] = keyCode.getValue();
    unlockSharedMemory();
}