From 4000d4f81c877beb5c1d11c09f3c517c4a94feee Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Mon, 5 Oct 2020 13:58:55 -0400
Subject: first draft

---
 ipcrm.c | 160 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 ipcrm.c

diff --git a/ipcrm.c b/ipcrm.c
new file mode 100644
index 0000000..6dca2b8
--- /dev/null
+++ b/ipcrm.c
@@ -0,0 +1,160 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2019, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _XOPEN_SOURECE 700
+#include <errno.h>
+#include <locale.h>
+#include <search.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#include <unistd.h>
+
+typedef enum { MSGID, SHMID, SEMID, MSGKEY, SHMKEY, SEMKEY } ipc_type;
+
+struct ipcrm {
+	struct ipcrm *next;
+	struct ipcrm *prev;
+	ipc_type type;
+	const char *id;
+};
+
+static struct ipcrm *ipcrm_q(ipc_type t, const char *id, struct ipcrm *head)
+{
+	struct ipcrm *add = calloc(1, sizeof(*add));
+	if (add == NULL) {
+		perror("ipcrm");
+		return NULL;
+	}
+	add->type = t;
+	add->id = id;
+	/* TODO: do ID translation and error checking at this point */
+
+	if (head == NULL) {
+		return add;
+	}
+
+	struct ipcrm *tail = head;
+	while (tail && tail->next) {
+		tail = tail->next;
+	}
+	insque(add, tail);
+
+	return head;
+}
+
+static int ipcrm(struct ipcrm *ipc)
+{
+	int id = atoi(ipc->id);
+	int ret = 0;
+
+	switch (ipc->type) {
+	case MSGID:
+		ret = msgctl(id, IPC_RMID, NULL);
+		break;
+
+	case MSGKEY:
+		/* TODO */
+		break;
+
+	case SEMID:
+		ret = semctl(id, 0, IPC_RMID);
+		break;
+
+	case SEMKEY:
+		/* TODO */
+		break;
+
+	case SHMID:
+		ret = shmctl(id, IPC_RMID, NULL);
+		break;
+
+	case SHMKEY:
+		/* TODO */
+		break;
+	}
+
+	if (ret == -1) {
+		fprintf(stderr, "ipcrm: %s: %s\n", ipc->id, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+	int c;
+	int ret = 0;
+	struct ipcrm *list = NULL;
+
+	while ((c = getopt(argc, argv, "q:Q:s:S:m:M:")) != -1) {
+		switch(c) {
+		case 'q':
+			list = ipcrm_q(MSGID, optarg, list);
+			break;
+
+		case 'Q':
+			list = ipcrm_q(MSGKEY, optarg, list);
+			break;
+
+		case 's':
+			list = ipcrm_q(SEMID, optarg, list);
+			break;
+
+		case 'S':
+			list = ipcrm_q(SEMKEY, optarg, list);
+			break;
+
+		case 'm':
+			list = ipcrm_q(SHMID, optarg, list);
+			break;
+
+		case 'M':
+			list = ipcrm_q(SHMKEY, optarg, list);
+			break;
+
+		default:
+			return 1;
+		}
+
+		if (list == NULL) {
+			return 1;
+		}
+	}
+
+	while (list) {
+		printf("remove '%s' (%d)\n", list->id, list->type);
+		ret |= ipcrm(list);
+		list = list->next;
+	}
+
+	return ret;
+}
-- 
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