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-rw-r--r--io/tst-readlinkat.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/io/tst-readlinkat.c b/io/tst-readlinkat.c
new file mode 100644
index 0000000..891b6e6
--- /dev/null
+++ b/io/tst-readlinkat.c
@@ -0,0 +1,136 @@
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+static int dir_fd;
+
+static void
+prepare (void)
+{
+ size_t test_dir_len = strlen (test_dir);
+ static const char dir_name[] = "/tst-symlinkat.XXXXXX";
+
+ size_t dirbuflen = test_dir_len + sizeof (dir_name);
+ char *dirbuf = malloc (dirbuflen);
+ if (dirbuf == NULL)
+ {
+ puts ("out of memory");
+ exit (1);
+ }
+
+ snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
+ if (mkdtemp (dirbuf) == NULL)
+ {
+ puts ("cannot create temporary directory");
+ exit (1);
+ }
+
+ add_temp_file (dirbuf);
+
+ dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
+ if (dir_fd == -1)
+ {
+ puts ("cannot open directory");
+ exit (1);
+ }
+}
+
+
+static int
+do_test (void)
+{
+ /* fdopendir takes over the descriptor, make a copy. */
+ int dupfd = dup (dir_fd);
+ if (dupfd == -1)
+ {
+ puts ("dup failed");
+ return 1;
+ }
+ if (lseek (dupfd, 0, SEEK_SET) != 0)
+ {
+ puts ("1st lseek failed");
+ return 1;
+ }
+
+ /* The directory should be empty safe the . and .. files. */
+ DIR *dir = fdopendir (dupfd);
+ if (dir == NULL)
+ {
+ puts ("fdopendir failed");
+ return 1;
+ }
+ struct dirent64 *d;
+ while ((d = readdir64 (dir)) != NULL)
+ if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
+ {
+ printf ("temp directory contains file \"%s\"\n", d->d_name);
+ return 1;
+ }
+ closedir (dir);
+
+ static const char symlinkcontent[] = "some-file";
+ if (symlinkat (symlinkcontent, dir_fd, "another-file") != 0)
+ {
+ puts ("symlinkat failed");
+ return 1;
+ }
+
+ struct stat64 st2;
+ if (fstatat64 (dir_fd, "another-file", &st2, AT_SYMLINK_NOFOLLOW) != 0)
+ {
+ puts ("fstatat64 failed");
+ return 1;
+ }
+ if (!S_ISLNK (st2.st_mode))
+ {
+ puts ("2nd fstatat64 does not show file is a symlink");
+ return 1;
+ }
+
+ if (fstatat64 (dir_fd, symlinkcontent, &st2, AT_SYMLINK_NOFOLLOW) == 0)
+ {
+ puts ("2nd fstatat64 succeeded");
+ return 1;
+ }
+
+ char buf[100];
+ int n = readlinkat (dir_fd, "another-file", buf, sizeof (buf));
+ if (n == -1)
+ {
+ puts ("readlinkat failed");
+ return 1;
+ }
+ if (n != sizeof (symlinkcontent) - 1)
+ {
+ printf ("readlinkat returned %d, expected %zu\n",
+ n, sizeof (symlinkcontent) - 1);
+ return 1;
+ }
+ if (strncmp (buf, symlinkcontent, n) != 0)
+ {
+ puts ("readlinkat retrieved wrong link content");
+ return 1;
+ }
+
+ if (unlinkat (dir_fd, "another-file", 0) != 0)
+ {
+ puts ("unlinkat failed");
+ return 1;
+ }
+
+ close (dir_fd);
+
+ return 0;
+}