tests: Replace various function calls with their x variant

With fortification enabled, few function calls return result need to be
checked, has they get the __wur macro enabled.

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

misc/tst-error1.c

@@ -5,11 +5,13 @@
 #include <wchar.h>
 #include <libc-diag.h>
 
+#include <support/xstdio.h>
+
 static int
 do_test (int argc, char *argv[])
 {
   mtrace ();
-  (void) freopen (argc == 1 ? "/dev/stdout" : argv[1], "a", stderr);
+  xfreopen (argc == 1 ? "/dev/stdout" : argv[1], "a", stderr);
   /* Orient the stream.  */
   fwprintf (stderr, L"hello world\n");
   char buf[20000];

nss/tst-reload2.c

@@ -121,7 +121,7 @@ do_test (void)
   /* Change the root dir.  */
 
   TEST_VERIFY (chroot ("/subdir") == 0);
-  chdir ("/");
+  xchdir ("/");
 
   /* Check we're NOT using the "inner" nsswitch.conf.  */
 

posix/tst-chmod.c

@@ -27,6 +27,8 @@
 #include <unistd.h>
 #include <sys/stat.h>
 
+#include <support/xunistd.h>
+
 
 #define OUT_OF_MEMORY \
   do {									      \
@@ -229,7 +231,8 @@ do_test (int argc, char *argv[])
   close (fd);
 
   snprintf (buf, buflen, "%s/..", testdir);
-  chdir (buf);
+  xchdir (buf);
+
   /* We are now in the directory above the one we create the test
      directory in.  */
 
@@ -349,7 +352,7 @@ do_test (int argc, char *argv[])
     }
 
  fail:
-  chdir (startdir);
+  xchdir (startdir);
 
   /* Remove all the files.  */
   chmod (testdir, 0700);

posix/wordexp-test.c

@@ -336,7 +336,7 @@ do_test (int argc, char *argv[])
   if (cwd == NULL)
     cwd = "..";
 
-  chdir (cwd);
+  xchdir (cwd);
   rmdir (tmpdir);
 
   return 0;

stdlib/test-canon.c

@@ -27,6 +27,8 @@
 #include <sys/param.h>
 #include <sys/stat.h>
 
+#include <support/xunistd.h>
+
 /* Prototype for our test function.  */
 extern int do_test (int argc, char *argv[]);
 #include <test-skeleton.c>
@@ -159,7 +161,7 @@ do_test (int argc, char ** argv)
     }
 
   for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
-    symlink (symlinks[i].value, symlinks[i].name);
+    xsymlink (symlinks[i].value, symlinks[i].name);
 
   int has_dir = mkdir ("doesExist", 0777) == 0;