linux: Add lutimes test

It uses stat to compare against the values set by lutimes.

Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

io/Makefile

@@ -72,6 +72,7 @@ tests		:= test-utime test-stat test-stat2 test-lfs tst-getcwd \
 		   tst-utime \
 		   tst-utimes \
 		   tst-futimes \
+		   tst-lutimes \
 		   tst-futimens \
 
 # Likewise for statx, but we do not need static linking here.

io/tst-futimens.c

@@ -38,7 +38,7 @@ test_futimens_helper (const char *file, int fd, const struct timespec *ts)
   return 0;
 }
 
-#define TEST_CALL(fname, fd, v1, v2) \
+#define TEST_CALL(fname, fd, lname, v1, v2) \
   test_futimens_helper (fname, fd, (struct timespec[]) { { v1, 0 }, \
 							 { v2, 0 } })
 

io/tst-futimes.c

@@ -39,7 +39,7 @@ test_futimens_helper (const char *file, int fd, const struct timeval *tv)
   return 0;
 }
 
-#define TEST_CALL(fname, fd, v1, v2) \
+#define TEST_CALL(fname, fd, lname, v1, v2) \
   test_futimens_helper (fname, fd, (struct timeval[]) { { v1, 0 }, \
 							{ v2, 0 } })
 

io/tst-lutimes.c

@@ -0,0 +1,53 @@
+/* Test for lutimes.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+static int
+test_lutimes_helper (const char *testfile, int fd, const char *testlink,
+                     const struct timeval *tv)
+{
+  struct stat64 stfile_orig;
+  xlstat (testfile, &stfile_orig);
+
+  TEST_VERIFY_EXIT (lutimes (testlink, tv) == 0);
+
+  struct stat64 stlink;
+  xlstat (testlink, &stlink);
+
+  TEST_COMPARE (stlink.st_atime, tv[0].tv_sec);
+  TEST_COMPARE (stlink.st_mtime, tv[1].tv_sec);
+
+  /* Check if the timestamp from original file is not changed.  */
+  struct stat64 stfile;
+  xlstat (testfile, &stfile);
+
+  TEST_COMPARE (stfile_orig.st_atime, stfile.st_atime);
+  TEST_COMPARE (stfile_orig.st_mtime, stfile.st_mtime);
+
+  return 0;
+}
+
+#define TEST_CALL(fname, fd, lname, v1, v2) \
+  test_lutimes_helper (fname, fd, lname, (struct timeval[]) { { v1, 0 }, \
+                                                              { v2, 0 } })
+
+#include "tst-utimensat-skeleton.c"

io/tst-utime.c

@@ -39,7 +39,7 @@ test_utime_helper (const char *file, int fd, const struct utimbuf *ut)
   return 0;
 }
 
-#define TEST_CALL(fname, fd, v1, v2) \
+#define TEST_CALL(fname, fd, lname, v1, v2) \
   test_utime_helper (fname, fd, &(struct utimbuf) { (v1), (v2) })
 
 #include "tst-utimensat-skeleton.c"

io/tst-utimensat-skeleton.c

@@ -24,6 +24,7 @@
 
 static int temp_fd = -1;
 static char *testfile;
+static char *testlink;
 
 const static struct {
   int64_t v1;
@@ -49,6 +50,10 @@ do_prepare (int argc, char *argv[])
 {
   temp_fd = create_temp_file ("utime", &testfile);
   TEST_VERIFY_EXIT (temp_fd > 0);
+
+  testlink = xasprintf ("%s-symlink", testfile);
+  xsymlink (testfile, testlink);
+  add_temp_file (testlink);
 }
 
 static int
@@ -82,7 +87,7 @@ do_test (void)
 	  continue;
 	}
 
-      TEST_CALL (testfile, temp_fd, tests[i].v1, tests[i].v2);
+      TEST_CALL (testfile, temp_fd, testlink, tests[i].v1, tests[i].v2);
     }
 
   return 0;

io/tst-utimes.c

@@ -40,7 +40,7 @@ test_utimes_helper (const char *file, int fd, const struct timeval *tv)
   return 0;
 }
 
-#define TEST_CALL(fname, fd, v1, v2) \
+#define TEST_CALL(fname, fd, lname, v1, v2) \
   test_utimes_helper (fname, fd, (struct timeval[]) { { v1, 0 }, \
 						      { v2, 0 } })