Elaborato_SO/src/custom_msgq.c

#include <sys/msg.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>

#include <custom_msgq.h>
#include <errExit.h>
#include <server.h>
#include <client.h>
#include <forza4.h>

int _MSGQID;

void msgRcv(void *msgp, size_t size, long mtype);
void msgSnd(void *msgp, size_t size);
void openMsgq();
void sndId();
void rcvId();

void setupServerMsgq() {
    openMsgq();
    sndId();
}

void setupClientMsgq() {
    openMsgq();
    rcvId();
}

void openMsgq() {
    key_t msgKey = ftok(KEYFILE, MSGQKEY);
    _MSGQID = msgget(msgKey, IPC_CREAT | S_IRUSR | S_IWUSR);
    if (_MSGQID == -1){
        errExitMsg("msgget");
    }
}

void sndId() {
    msg_t msg = {
        .mtype = 1,
        .server_in = _INPUT_S,
        .player_id = 0,
        .server_pid = getpid()
    };

    sndMsg(&msg);
    msg.player_id = 1;
    sndMsg(&msg);
}

void rcvId() {
    printf(PCLIENT "Waiting for message...\n");

    msg_t msg;
    rcvMsg(&msg);

    setRows(msg.server_in.rows);
    setCollums(msg.server_in.collums);
    setTokens(msg.server_in.player1Token, msg.server_in.player2Token);
    ID = msg.player_id;
    SERVER_PID = msg.server_pid;
}


void msgRcv(void *msgp, size_t size, long mtype) {
    int res;
    do {
        res = msgrcv(_MSGQID, msgp, size, mtype, 0);
    } while (errno == EINTR);

    if (res == -1) {
        errExit("msgrcv", "msgRcv");
    }
}

void rcvMsg(msg_t *msg) {
    msgRcv(msg, sizeof(msg_t) - sizeof(long), MSG);
}

void rcvMove(move_t *move) {
    msgRcv(move, sizeof(move_t) - sizeof(long), MOVE);
}
void rcvPlayer(player_ds *player) {
    msgRcv(player, sizeof(player_ds) - sizeof(long), PLAYER);
}
void rcvGame_end(game_end_t *game) {
    msgRcv(game, sizeof(game_end_t) - sizeof(long), GAME_END);
}



void msgSnd(void *msgp, size_t size) {
    int res;
    do {
        res = msgsnd(_MSGQID, msgp, size, 0);
    } while (errno == EINTR);

    if (res == -1) {
        errExitMsg("msgsnd");
    }
}

void sndMsg(msg_t *msg) {
    msgSnd(msg, sizeof(msg_t) - sizeof(long));
}

void sndMove(move_t *move) {
    msgSnd(move, sizeof(move_t) - sizeof(long));
}

void sndPlayer(player_ds *player) {
    msgSnd(player, sizeof(player_ds) - sizeof(long));
}

void sndGame_end(game_end_t *game) {
    msgSnd(game, sizeof(game_end_t) - sizeof(long));
}