[LTP] [PATCH v3 1/2] 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 7c77f0b3f920 ("splice: implement pipe to pipe splicing").

Signed-off-by: Boyang Xue <bxue@redhat.com>
---
 runtest/syscalls                            |   1 +
 testcases/kernel/syscalls/.gitignore        |   1 +
 testcases/kernel/syscalls/splice/splice04.c | 117 ++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 testcases/kernel/syscalls/splice/splice04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 5909456..d6c9ab4 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1224,6 +1224,7 @@ sockioctl01 sockioctl01
 splice01 splice01
 splice02 seq 1 20000 | splice02 splice02-temp
 splice03 splice03
+splice04 splice04
 
 tee01 tee01
 tee02 tee02
diff --git a/testcases/kernel/syscalls/.gitignore b/testcases/kernel/syscalls/.gitignore
index d5985cd..92ddbbe 100644
--- a/testcases/kernel/syscalls/.gitignore
+++ b/testcases/kernel/syscalls/.gitignore
@@ -976,6 +976,7 @@
 /splice/splice01
 /splice/splice02
 /splice/splice03
+/splice/splice04
 /ssetmask/ssetmask01
 /stat/stat01
 /stat/stat01_64
diff --git a/testcases/kernel/syscalls/splice/splice04.c b/testcases/kernel/syscalls/splice/splice04.c
new file mode 100644
index 0000000..30ed692
--- /dev/null
+++ b/testcases/kernel/syscalls/splice/splice04.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2017 Red Hat, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Boyang Xue <bxue@redhat.com>
+ */
+
+/*
+ * Functional test for splice(2): pipe to pipe
+ *
+ * This test case tests splice(2) from a pipe to another
+ */
+
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "tst_test.h"
+
+#define PIPE_MAX (64*1024)
+
+static char *str_len_data;
+static int num_len_data = PIPE_MAX;
+static char *arr_in;
+static char *arr_out;
+
+static struct tst_option options[] = {
+	{"l:", &str_len_data, "-l <num> Length of test data (in bytes)"},
+	{NULL, NULL, NULL},
+};
+
+static void setup(void)
+{
+	int i, fd, pipe_max_unpriv, pipe_limit;
+	FILE *s;
+
+	fd = SAFE_OPEN("/proc/sys/fs/pipe-max-size", O_RDONLY);
+	s = fdopen(fd, "r");
+	if (s == NULL)
+		tst_brk(TBROK, "fdopen() error");
+	if (fscanf(s, "%d", &pipe_max_unpriv) != 1)
+		tst_brk(TBROK, "Fail to get value of /proc/sys/fs/pipe-max-size");
+	else {
+		pipe_limit = pipe_max_unpriv < num_len_data ? pipe_max_unpriv : num_len_data;
+		num_len_data = pipe_limit;
+	}
+	if (fclose(s) == EOF)
+		tst_brk(TBROK, "Fail to close file");
+
+	if (tst_parse_int(str_len_data, &num_len_data, 1, pipe_limit))
+		tst_brk(TBROK, "Invalid length of data: '%s', valid value: [1, %d]", str_len_data, pipe_limit);
+	tst_res(TINFO, "splice size = %d", num_len_data);
+	arr_in = SAFE_MALLOC(num_len_data);
+	arr_out = SAFE_MALLOC(num_len_data);
+	for (i = 0; i < num_len_data; i++)
+		arr_in[i] = i & 0xff;
+}
+
+static void cleanup(void)
+{
+	free(arr_in);
+	free(arr_out);
+}
+
+static void pipe_pipe(void)
+{
+	int pp1[2], pp2[2], i, ret;
+
+	SAFE_PIPE(pp1);
+	SAFE_PIPE(pp2);
+	SAFE_WRITE(1, pp1[1], arr_in, num_len_data);
+	do {
+		ret = splice(pp1[0], NULL, pp2[1], NULL, num_len_data, SPLICE_F_MOVE);
+		if (ret == 0)
+			break;
+		else if (ret == -1) {
+			tst_res(TFAIL | TERRNO, "splice error");
+			goto exit;
+		}
+	} while (num_len_data - ret);
+	SAFE_READ(1, pp2[0], arr_out, num_len_data);
+
+	for (i = 0; i < num_len_data; i++) {
+		if (arr_in[i] != arr_out[i]) {
+			tst_res(TFAIL, "wrong data at %d: expected: %d, actual: %d", i, arr_in[i], arr_out[i]);
+			goto exit;
+		}
+	}
+	tst_res(TPASS, "splice(2) from pipe to pipe run pass.");
+
+exit:
+	SAFE_CLOSE(pp1[1]);
+	SAFE_CLOSE(pp1[0]);
+	SAFE_CLOSE(pp2[1]);
+	SAFE_CLOSE(pp2[0]);
+}
+
+static struct tst_test test = {
+	.tid = "splice04",
+	.test_all = pipe_pipe,
+	.setup = setup,
+	.cleanup = cleanup,
+	.options = options,
+	.min_kver = "2.6.31"
+};
-- 
1.8.3.1