From 7bea27b8e755a02526183477efb3b16db9d4c290 Mon Sep 17 00:00:00 2001
From: Edi De Candido <decandidoedi@gmail.com>
Date: Sun, 14 May 2023 22:13:55 +0200
Subject: [PATCH] shared memory finita

---
 inc/structures.h | 17 +++++++++++------
 src/custom_shm.c | 37 +++++++++++++++++++++++++++++++++----
 2 files changed, 44 insertions(+), 10 deletions(-)

diff --git a/inc/structures.h b/inc/structures.h
index ef22c7e..642c1f4 100644
--- a/inc/structures.h
+++ b/inc/structures.h
@@ -3,7 +3,6 @@
 
 
 
-#define KEYFILE "../LICENSE"
 
 // semaphore
 union semun {
@@ -13,6 +12,9 @@ union semun {
 };
 
 // shared memory
+#define KEYFILE "../LICENSE"
+#define SHMERR (void *)-1
+
 typedef struct {
     int collums;
     int rows;
@@ -26,15 +28,18 @@ typedef enum {
     PLAYER2
 } tile_t;
 
-typedef struct {
-    tile_t *board;
-    input_server_t inS;
-} shm_t;
-
 static const size_t SHM_SIZE = sizeof(shm_t);
 
 // signal
 #define DEFAULT_SIGINT 2
 #define TIME_TO_RESET 10
 
+//message queue
+typedef struct {
+    long mtype;
+    int board_id;
+    input_server_t server_in;
+    char *name_player1, *name_player2;
+} msgq_t;
+
 #endif
\ No newline at end of file
diff --git a/src/custom_shm.c b/src/custom_shm.c
index a4180ff..1381b7f 100644
--- a/src/custom_shm.c
+++ b/src/custom_shm.c
@@ -1,16 +1,45 @@
+#include <stdio.h>
 #include <sys/shm.h>
 #include <sys/stat.h>
 #include <custom_shm.h>
 #include <structures.h>
 #include <errExit.h>
 
-int getShmid() {
-    int shmid = shmget(ftok(KEYFILE, 'z'), SHM_SIZE, IPC_CREAT | S_IRUSR | S_IWUSR);
-    if (result == -1) {
+int getShmid(int row, int col) {
+    int shmid = shmget(ftok(KEYFILE, 'z'), row * col * sizeof(tile_t), IPC_CREAT | S_IRUSR | S_IWUSR);
+    if (shmid == -1) {
         errExit("shmget", "getShmid");
     }
 
-    
     return shmid;
 }
 
+tile_t * shmServerAt(int shmid) {
+    tile_t *result = (tile_t *)shmat(shmid, NULL, 0); 
+    if (result == SHMERR) {
+        errExit("shmat", "shmServerAt");
+    }
+
+    return result;
+} 
+
+tile_t * shmClientAt(int shmid) {
+    tile_t *result = (tile_t *)shmat(shmid, NULL, SHM_RDONLY); 
+    if (result == SHMERR) {
+        errExit("shmat", "shmClientAt");
+    }
+
+    return result;
+} 
+
+void shmDt(void *shm) {
+    if (shmdt(shm) == -1) {
+        errExit("shmdt", "shmDt");
+    }
+}
+
+void shmServerRm(int shmid) {
+    if (shmctl(shmid, IPC_RMID, NULL) == -1) {
+        errExit("shmctl", "shmServerRm");
+    } 
+}
\ No newline at end of file