feat: Massive OS expansion with IPC, Sound & TTS, Block layer, FAT32/ext2/sysfs, Signals, Syscalls, Modules, Drivers & 50+ LazyBox applets

ipc/shm.c

@@ -0,0 +1,64 @@
+#include <ipc/shm.h>
+#include <mm/kmalloc.h>
+#include <lib/string.h>
+
+static shmid_ds_t shm_segs[MAX_SHM_SEGS];
+
+int shmget(key_t key, size_t size, int shmflg) {
+    (void)shmflg;
+    if (size > SHM_MAX_SIZE) return -1;
+
+    for (int i = 0; i < MAX_SHM_SEGS; i++) {
+        if (shm_segs[i].in_use && shm_segs[i].key == key) {
+            return i;
+        }
+    }
+
+    for (int i = 0; i < MAX_SHM_SEGS; i++) {
+        if (!shm_segs[i].in_use) {
+            void* mem = kzalloc(size);
+            if (!mem) return -1;
+
+            shm_segs[i].in_use = true;
+            shm_segs[i].key = key;
+            shm_segs[i].shmid = i;
+            shm_segs[i].size = size;
+            shm_segs[i].addr = mem;
+            shm_segs[i].nattch = 0;
+            return i;
+        }
+    }
+    return -1;
+}
+
+void* shmat(int shmid, const void* shmaddr, int shmflg) {
+    (void)shmaddr; (void)shmflg;
+    if (shmid < 0 || shmid >= MAX_SHM_SEGS || !shm_segs[shmid].in_use) return (void*)-1;
+    shm_segs[shmid].nattch++;
+    return shm_segs[shmid].addr;
+}
+
+int shmdt(const void* shmaddr) {
+    if (!shmaddr) return -1;
+    for (int i = 0; i < MAX_SHM_SEGS; i++) {
+        if (shm_segs[i].in_use && shm_segs[i].addr == shmaddr) {
+            if (shm_segs[i].nattch > 0) shm_segs[i].nattch--;
+            return 0;
+        }
+    }
+    return -1;
+}
+
+int shmctl(int shmid, int cmd, struct shmid_ds* buf) {
+    if (shmid < 0 || shmid >= MAX_SHM_SEGS || !shm_segs[shmid].in_use) return -1;
+
+    if (cmd == IPC_RMID) {
+        if (shm_segs[shmid].addr) kfree(shm_segs[shmid].addr);
+        memset(&shm_segs[shmid], 0, sizeof(shmid_ds_t));
+        return 0;
+    } else if (cmd == IPC_STAT && buf) {
+        memcpy(buf, &shm_segs[shmid], sizeof(shmid_ds_t));
+        return 0;
+    }
+    return -1;
+}