Update MentOs code to the latest development version.

programs/ipcrm.c

@@ -0,0 +1,46 @@
+///                MentOS, The Mentoring Operating system project
+/// @file ipcrm.c
+/// @brief
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+int main(int argc, char **argv)
+{
+#if 0
+    if (argc != 2) {
+        printf("Bad arguments: you have to specify only IPC id, see ipcs.\n");
+
+        return;
+    }
+
+    struct shmid_ds *shmid_ds = head;
+    struct shmid_ds *prev = NULL;
+
+    while (shmid_ds != NULL) {
+        char strid[10];
+        int_to_str(strid, (shmid_ds->shm_perm).seq, 10);
+
+        if (strcmp(strid, argv[1]) == 0) {
+            break;
+        }
+
+        prev = shmid_ds;
+        shmid_ds = shmid_ds->next;
+    }
+
+    if (shmid_ds == NULL) {
+        printf("No shared memory find. \n");
+    } else {
+        kfree(shmid_ds->shm_location);
+
+        // shmid_ds = head.
+        if (prev == NULL) {
+            head = head->next;
+        } else {
+            prev->next = shmid_ds->next;
+        }
+
+        kfree(shmid_ds);
+    }
+#endif
+}