[LTP] [PATCH v2] syscalls/write06: Add new test
Dai Shili
daisl.fnst@fujitsu.com
Mon Dec 20 20:23:04 CET 2021
Like pwrite04.c, test the write() system call with O_APPEND.
Signed-off-by: Dai Shili <daisl.fnst@fujitsu.com>
---
runtest/syscalls | 1 +
testcases/kernel/syscalls/write/.gitignore | 1 +
testcases/kernel/syscalls/write/write06.c | 95 ++++++++++++++++++++++++++++++
3 files changed, 97 insertions(+)
create mode 100644 testcases/kernel/syscalls/write/write06.c
diff --git a/runtest/syscalls b/runtest/syscalls
index bcf3d56..32fcda4 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1699,6 +1699,7 @@ write02 write02
write03 write03
write04 write04
write05 write05
+write06 write06
writev01 writev01
writev02 writev02
diff --git a/testcases/kernel/syscalls/write/.gitignore b/testcases/kernel/syscalls/write/.gitignore
index 7f36194..8529aae 100644
--- a/testcases/kernel/syscalls/write/.gitignore
+++ b/testcases/kernel/syscalls/write/.gitignore
@@ -3,3 +3,4 @@
/write03
/write04
/write05
+/write06
diff --git a/testcases/kernel/syscalls/write/write06.c b/testcases/kernel/syscalls/write/write06.c
new file mode 100644
index 0000000..ea30d73
--- /dev/null
+++ b/testcases/kernel/syscalls/write/write06.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
+ * Author: Dai Shili <daisl.fnst@fujitsu.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Test the write() system call with O_APPEND.
+ *
+ * The full description of O_APPEND is in open(2) man-pages:
+ * O_APPEND
+ * The file is opened in append mode. Before each write(2), the
+ * file offset is positioned at the end of the file, as if with lseek(2).
+ * The modification of the file offset and the write operation are
+ * performed as a single atomic step.
+ *
+ * Writing 2k data to the file, close it and reopen it with O_APPEND.
+ * Verify that the file size is 3k and offset is moved to the end of the file.
+ */
+
+#include <stdlib.h>
+#include <inttypes.h>
+#include "tst_test.h"
+#include "tst_safe_prw.h"
+
+#define K1 1024
+#define K2 (K1 * 2)
+#define K3 (K1 * 3)
+#define DATA_FILE "write06_file"
+
+static int fd = -1;
+static char *write_buf[2];
+
+static void verify_write(void)
+{
+ off_t off;
+ struct stat statbuf;
+
+ fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_CREAT | O_TRUNC);
+ SAFE_WRITE(1, fd, write_buf[0], K2);
+ SAFE_CLOSE(fd);
+
+ fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_APPEND);
+ SAFE_FSTAT(fd, &statbuf);
+ if (statbuf.st_size != K2)
+ tst_res(TFAIL, "file size is %ld != K2", statbuf.st_size);
+
+ off = SAFE_LSEEK(fd, K1, SEEK_SET);
+ if (off != K1)
+ tst_brk(TBROK, "Failed to seek to K1");
+
+ SAFE_WRITE(1, fd, write_buf[1], K1);
+
+ off = SAFE_LSEEK(fd, 0, SEEK_CUR);
+ if (off != K3)
+ tst_res(TFAIL, "Wrong offset after write %zu expected %u", off, K3);
+ else
+ tst_res(TPASS, "Offset is correct after write %zu", off);
+
+ SAFE_FSTAT(fd, &statbuf);
+ if (statbuf.st_size != K3)
+ tst_res(TFAIL, "Wrong file size after append %zu expected %u", statbuf.st_size, K3);
+ else
+ tst_res(TPASS, "Correct file size after append %u", K3);
+
+ SAFE_CLOSE(fd);
+}
+
+static void setup(void)
+{
+ memset(write_buf[0], 0, K2);
+ memset(write_buf[1], 1, K1);
+}
+
+static void cleanup(void)
+{
+ if (fd != -1)
+ SAFE_CLOSE(fd);
+
+ SAFE_UNLINK(DATA_FILE);
+}
+
+static struct tst_test test = {
+ .needs_tmpdir = 1,
+ .setup = setup,
+ .cleanup = cleanup,
+ .test_all = verify_write,
+ .bufs = (struct tst_buffers[]) {
+ {&write_buf[0], .size = K2},
+ {&write_buf[1], .size = K1},
+ {}
+ }
+};
--
1.8.3.1
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