[LTP] [PATCH v1 1/1] syscalls/splice04: add test for splice() from pipe to pipe

[bxue@redhat.com]

From: Boyang Xue <bxue@redhat.com>

This test case covers pipe to pipe splice operation, which was introduced in
kernel commit 7c77f0b3: "splice: implement pipe to pipe splicing".

Signed-off-by: Boyang Xue <bxue@redhat.com>
---
 runtest/syscalls                            |   1 +
 testcases/kernel/syscalls/splice/splice04.c | 130 ++++++++++++++++++++++++++++
 2 files changed, 131 insertions(+)
 create mode 100644 testcases/kernel/syscalls/splice/splice04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 15ae66e..c95da04 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1222,6 +1222,7 @@ sockioctl01 sockioctl01
 splice01 splice01
 splice02 seq 1 20000 | splice02 splice02-temp
 splice03 splice03
+splice04 splice04 -l 65536
 
 tee01 tee01
 tee02 tee02
diff --git a/testcases/kernel/syscalls/splice/splice04.c b/testcases/kernel/syscalls/splice/splice04.c
new file mode 100644
index 0000000..951c004
--- /dev/null
+++ b/testcases/kernel/syscalls/splice/splice04.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ * Author: Boyang Xue <bxue@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it
+ * is free of the rightful claim of any third person regarding
+ * infringement or the like.  Any license provided herein, whether
+ * implied or otherwise, applies only to this software file.  Patent
+ * licenses, if any, provided herein do not apply to combinations of
+ * this program with other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * Functional test for splice(2): pipe to pipe
+ *
+ * This test case tests splice(2) from a pipe to another
+ */
+
+#define _GNU_SOURCE
+#include "tst_test.h"
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+#define MAX_DATA_LEN (64*1024)
+
+static void cleanup(void);
+static void setup(void);
+static void tc_dispatcher(unsigned int n);
+static int pipe_pipe(void);
+static int cmp_data(char *arr);
+
+static char *str_len_data;
+static int num_len_data;
+static char *arr_data;
+
+static struct tst_option options[] = {
+	{"l:", &str_len_data, "-l <num> Length of test data (in bytes)"},
+	{NULL, NULL, NULL},
+};
+
+static void cleanup(void){
+}
+
+static void setup(void){
+	int i;
+
+	if (tst_parse_int(str_len_data, &num_len_data, 1, MAX_DATA_LEN)){
+		tst_brk(TBROK, "Invalid length of test data: '%s'", str_len_data);
+	}
+	arr_data = (char *) SAFE_MALLOC(num_len_data);
+	for(i = 0; i < num_len_data; i++){
+		*(arr_data + i) = i & 0xff;
+	}
+}
+
+static void tc_dispatcher(unsigned int n){
+	int ret;
+
+	switch (n){
+		case 0:
+			ret = pipe_pipe();
+			if (ret < 0){
+				tst_res(TFAIL, "splice(2) from pipe to pipe fails.");
+			} else {
+				tst_res(TPASS, "splice(2) from pipe to pipe run pass.");
+			}
+			break;
+		default:
+			tst_res(TBROK, "No corresponding test case exists.");
+			break;
+	}
+}
+
+static int cmp_data(char *arr){
+	int i;
+
+	for (i = 0; i < num_len_data; i++){
+		if (*(arr_data + i) != *(arr + i)){
+			tst_res(TBROK, "Error in comparing original data with data after splice(2): data mismatch.");
+			free(arr);
+			return -1;
+		}
+	}
+	free(arr);
+	return 0;
+}
+
+static int pipe_pipe(void){
+	char *arr;
+	int pp1[2], pp2[2];
+
+	arr = (char *) SAFE_MALLOC(num_len_data);
+	SAFE_PIPE(pp1);
+	SAFE_PIPE(pp2);
+	SAFE_WRITE(1, pp1[1], arr_data, num_len_data);
+	splice(pp1[0], NULL, pp2[1], NULL, num_len_data, SPLICE_F_MOVE);
+	SAFE_READ(1, pp2[0], arr, num_len_data);
+
+	SAFE_CLOSE(pp1[1]);
+	SAFE_CLOSE(pp1[0]);
+	SAFE_CLOSE(pp2[1]);
+	SAFE_CLOSE(pp2[0]);
+
+	return cmp_data(arr);
+}
+
+static struct tst_test test = {
+	.tid = "splice04",
+	.needs_tmpdir = 0,
+	.test = tc_dispatcher,
+	.tcnt = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.options = options,
+	.min_kver = "2.6.31"
+};
-- 
1.8.3.1