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

ipc/sem.c

@@ -0,0 +1,53 @@
+#include <ipc/sem.h>
+#include <lib/string.h>
+
+static semid_ds_t sem_sets[MAX_SEM_SETS];
+
+int semget(key_t key, int nsems, int semflg) {
+    (void)semflg;
+    if (nsems <= 0 || nsems > MAX_SEMS_PER_SET) return -1;
+
+    for (int i = 0; i < MAX_SEM_SETS; i++) {
+        if (sem_sets[i].in_use && sem_sets[i].key == key) {
+            return i;
+        }
+    }
+
+    for (int i = 0; i < MAX_SEM_SETS; i++) {
+        if (!sem_sets[i].in_use) {
+            sem_sets[i].in_use = true;
+            sem_sets[i].key = key;
+            sem_sets[i].semid = i;
+            sem_sets[i].nsems = (uint32_t)nsems;
+            for (int s = 0; s < nsems; s++) {
+                sem_sets[i].values[s] = 0;
+            }
+            return i;
+        }
+    }
+    return -1;
+}
+
+int semop(int semid, struct sembuf* sops, size_t nsops) {
+    if (semid < 0 || semid >= MAX_SEM_SETS || !sem_sets[semid].in_use || !sops) return -1;
+
+    semid_ds_t* set = &sem_sets[semid];
+    for (size_t i = 0; i < nsops; i++) {
+        if (sops[i].sem_num >= set->nsems) return -1;
+        set->values[sops[i].sem_num] += sops[i].sem_op;
+    }
+    return 0;
+}
+
+int semctl(int semid, int semnum, int cmd, ...) {
+    if (semid < 0 || semid >= MAX_SEM_SETS || !sem_sets[semid].in_use) return -1;
+
+    if (cmd == IPC_RMID) {
+        memset(&sem_sets[semid], 0, sizeof(semid_ds_t));
+        return 0;
+    }
+    if (semnum >= 0 && semnum < (int)sem_sets[semid].nsems) {
+        return sem_sets[semid].values[semnum];
+    }
+    return 0;
+}