syscalls/msgstress: Add common file for msgstress

Copy old libmsgctl.c three functions(doreader,dowriter, fill_buffer, verify)
into this common file. The reason for not putting it into lib directory because
only msgstress cases use these functions. So raising them into lib level makes
no sense.

Signed-off-by: Yang Xu <[email protected]>

Author: xuyang0410

testcases/kernel/syscalls/ipc/msgstress/Makefile

@@ -6,7 +6,7 @@ top_srcdir              ?= ../../../../..
 LTPLIBS = ltpipc
 
 include $(top_srcdir)/include/mk/testcases.mk
-
+FILTER_OUT_MAKE_TARGETS         := msgstress_common
 LTPLDLIBS  += -lltpipc
 
 include $(top_srcdir)/include/mk/generic_leaf_target.mk

testcases/kernel/syscalls/ipc/msgstress/msgstress_common.c

@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) International Business Machines  Corp., 2002
+ * Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
+ * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved。
+ */
+
+#define TST_NO_DEFAULT_MAIN
+#include "msgstress_common.h"
+
+int verify(char *buf, char val, int size, int child)
+{
+	while (size-- > 0) {
+		if (*buf++ != val) {
+			tst_res(TFAIL, "Verify error in child %d, *buf = %x, "
+				"val = %x, size = %d\n", child, *buf, val,
+				size);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+void do_reader(long key, int tid, long type, int child, int nreps)
+{
+	int i, size;
+	int id;
+	struct mbuffer buffer;
+
+	id = SAFE_MSGGET(key, 0);
+	if (id != tid) {
+		tst_res(TFAIL,
+			"Message queue mismatch in the reader of child group"
+			" %d for message queue id %d\n", child, id);
+		return;
+	}
+	for (i = 0; i < nreps; i++) {
+		memset(&buffer, 0, sizeof(buffer));
+
+		size = SAFE_MSGRCV(id, &buffer, 100, type, 0);
+		if (buffer.type != type) {
+			tst_res(TFAIL, "Type mismatch in child %d, read #%d, "
+				"for message got %ld, exected %ld",
+				child, (i + 1), buffer.type, type);
+			return;
+		}
+		if (buffer.data.len + 1 != size) {
+			tst_res(TFAIL, "Size mismatch in child %d, read #%d, "
+				"for message got %d, expected %d",
+				child, (i + 1), buffer.data.len + 1, size);
+			return;
+		}
+		if (verify(buffer.data.pbytes, (key % 255), size - 1, child)) {
+			tst_res(TFAIL, "Verify failed in child %d read # = %d, "
+				"key = %lx\n", child, (i + 1), key);
+			return;
+		}
+		key++;
+	}
+}
+
+void fill_buffer(char *buf, char val, int size)
+{
+	int i;
+
+	for (i = 0; i < size; i++)
+		buf[i] = val;
+}
+
+void do_writer(long key, int tid, long type, int child, int nreps)
+{
+	int i, size;
+	int id;
+	struct mbuffer buffer;
+
+	id = SAFE_MSGGET(key, 0);
+	if (id != tid) {
+		tst_res(TFAIL, "Message queue mismatch in the reader of child"
+			" group %d for message queue id %d\n", child, id);
+		return;
+	}
+
+	for (i = 0; i < nreps; i++) {
+		memset(&buffer, 0, sizeof(buffer));
+
+		do {
+			size = (lrand48() % 99);
+		} while (size == 0);
+		fill_buffer(buffer.data.pbytes, (key % 255), size);
+		buffer.data.len = size;
+		buffer.type = type;
+		SAFE_MSGSND(id, &buffer, size + 1, 0);
+		key++;
+	}
+}

testcases/kernel/syscalls/ipc/msgstress/msgstress_common.h

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
+ * Author: Yang Xu <[email protected]>
+ */
+
+#ifndef MSGSTRESS_COMMON_H
+#define MSGSTRESS_COMMON_H
+
+#include <stdlib.h>
+#include "tst_safe_sysv_ipc.h"
+#include "tst_test.h"
+
+struct mbuffer {
+	long type;
+	struct {
+		char len;
+		char pbytes[99];
+	} data;
+};
+
+void do_reader(long key, int tid, long type, int child, int nreps);
+void do_writer(long key, int tid, long type, int child, int nreps);
+
+#endif
+