symlinkat: new module

[gnulib.git] / tests / test-symlinkat.c

diff --git a/tests/test-symlinkat.c b/tests/test-symlinkat.c
new file mode 100644 (file)
index 0000000..7942d27
--- /dev/null
+++ b/tests/test-symlinkat.c
@@ -0,0 +1,120 @@
+/* Tests of symlinkat and readlinkat.
+   Copyright (C) 2009 Free Software Foundation, 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/>.  */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#ifndef HAVE_SYMLINK
+# define HAVE_SYMLINK 0
+#endif
+
+#define ASSERT(expr) \
+  do                                                                         \
+    {                                                                        \
+      if (!(expr))                                                           \
+       {                                                                    \
+         fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__);  \
+         fflush (stderr);                                                   \
+         abort ();                                                          \
+       }                                                                    \
+    }                                                                        \
+  while (0)
+
+int
+main ()
+{
+  char buf[80];
+
+  /* Create handle for future use.  */
+  int dfd = openat (AT_FDCWD, ".", O_RDONLY);
+  ASSERT (0 <= dfd);
+
+  /* Sanity checks of failures.  Mingw lacks symlinkat, but readlinkat
+     can still distinguish between various errors.  */
+  errno = 0;
+  ASSERT (readlinkat (AT_FDCWD, "no_such", buf, sizeof buf) == -1);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (readlinkat (dfd, "no_such", buf, sizeof buf) == -1);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (readlinkat (AT_FDCWD, "", buf, sizeof buf) == -1);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (readlinkat (dfd, "", buf, sizeof buf) == -1);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (readlinkat (AT_FDCWD, ".", buf, sizeof buf) == -1);
+  ASSERT (errno == EINVAL);
+  errno = 0;
+  ASSERT (readlinkat (dfd, ".", buf, sizeof buf) == -1);
+  ASSERT (errno == EINVAL);
+  errno = 0;
+  ASSERT (symlinkat ("who cares", AT_FDCWD, "") == -1);
+  ASSERT (errno == ENOENT || errno == ENOSYS);
+  errno = 0;
+  ASSERT (symlinkat ("who cares", dfd, "") == -1);
+  ASSERT (errno == ENOENT || errno == ENOSYS);
+
+  /* Skip everything else on mingw.  */
+  if (HAVE_SYMLINK)
+    {
+      const char *linkname = "test-symlinkat.link";
+      const char *contents = "don't matter!";
+      int exp = strlen (contents);
+
+      /* Create link while cwd is '.', then read it in '..'.  */
+      ASSERT (symlinkat (contents, AT_FDCWD, linkname) == 0);
+      errno = 0;
+      ASSERT (symlinkat (contents, dfd, linkname) == -1);
+      ASSERT (errno == EEXIST);
+      ASSERT (chdir ("..") == 0);
+      errno = 0;
+      ASSERT (readlinkat (AT_FDCWD, linkname, buf, sizeof buf) == -1);
+      ASSERT (errno == ENOENT);
+      ASSERT (readlinkat (dfd, linkname, buf, sizeof buf) == exp);
+      ASSERT (strncmp (contents, buf, exp) == 0);
+      ASSERT (unlinkat (dfd, linkname, 0) == 0);
+
+      /* Create link while cwd is '..', then read it in '.'.  */
+      ASSERT (symlinkat (contents, dfd, linkname) == 0);
+      ASSERT (fchdir (dfd) == 0);
+      errno = 0;
+      ASSERT (symlinkat (contents, AT_FDCWD, linkname) == -1);
+      ASSERT (errno == EEXIST);
+      buf[0] = '\0';
+      ASSERT (readlinkat (AT_FDCWD, linkname, buf, sizeof buf) == exp);
+      ASSERT (strncmp (contents, buf, exp) == 0);
+      buf[0] = '\0';
+      ASSERT (readlinkat (dfd, linkname, buf, sizeof buf) == exp);
+      ASSERT (strncmp (contents, buf, exp) == 0);
+      ASSERT (unlink (linkname) == 0);
+    }
+
+  ASSERT (close (dfd) == 0);
+
+  return 0;
+}