[PATCH v2 1/4] msvcrt/tests: Add test for fopen sequential access hint

[Luke Deller]

Test that adding "S" to the fopen mode results in the underlying file
handle having the sequential access hint set.

Signed-off-by: Luke Deller 
---
 dlls/msvcrt/tests/file.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/dlls/msvcrt/tests/file.c b/dlls/msvcrt/tests/file.c
index fb242d81282..d02087be46c 100644
--- a/dlls/msvcrt/tests/file.c
+++ b/dlls/msvcrt/tests/file.c
@@ -35,6 +35,7 @@
 #include <process.h>
 #include <errno.h>
 #include <locale.h>
+#include <winternl.h>

#define MSVCRT_FD_BLOCK_SIZE 32
 typedef struct {
@@ -2731,6 +2732,39 @@ static void test_lseek(void)
     DeleteFileA("_creat.tst");
 }

+static void test_fopen_hints(void)
+{
+    char *tempf;
+    FILE *fp;
+    HANDLE handle;
+    FILE_MODE_INFORMATION mode_info;
+    IO_STATUS_BLOCK io;
+    NTSTATUS status;
+
+    /* create a test file */
+    tempf = _tempnam(".","wne");
+    fp = fopen(tempf, "wb");
+    ok(fp != NULL, "unable to create test file\n");
+    fwrite("abc\n", 1, 4, fp);
+    fclose(fp);
+
+    /* open test file with sequential access hint */
+    fp = fopen(tempf, "rbS");
+    ok(fp != NULL, "unable to open test file with sequential access hint\n");
+
+    /* check that sequential access hint is set on underlying file handle */
+    handle = (HANDLE)_get_osfhandle(_fileno(fp));
+    status = NtQueryInformationFile(handle, &io, &mode_info, sizeof(mode_info),
+            FileModeInformation);
+    ok(!status, "NtQueryInformationFile failed\n");
+    ok(mode_info.Mode & FILE_SEQUENTIAL_ONLY, "handle missing hint\n");
+
+    /* clean up */
+    fclose(fp);
+    unlink(tempf);
+    free(tempf);
+}
+
 START_TEST(file)
 {
     int arg_c;
@@ -2803,6 +2837,7 @@ START_TEST(file)
     test_close();
     test__creat();
     test_lseek();
+    test_fopen_hints();

/* Wait for the (_P_NOWAIT) spawned processes to finish to make sure the report
      * file contains lines in the correct order