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-rw-r--r--io/tst-openat.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/io/tst-openat.c b/io/tst-openat.c
new file mode 100644
index 0000000000..0ceb745880
--- /dev/null
+++ b/io/tst-openat.c
@@ -0,0 +1,209 @@
+#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-openat.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);
+
+ /* Try to create a file. */
+ int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
+ if (fd == -1)
+ {
+ if (errno == ENOSYS)
+ {
+ puts ("*at functions not supported");
+ return 0;
+ }
+
+ puts ("file creation failed");
+ return 1;
+ }
+ write (fd, "hello", 5);
+
+ /* Before closing the file, try using this file descriptor to open
+ another file. This must fail. */
+ int fd2 = openat (fd, "should-not-work", O_CREAT|O_RDWR, 0666);
+ if (fd2 != -1)
+ {
+ puts ("openat using descriptor for normal file worked");
+ return 1;
+ }
+ if (errno != ENOTDIR)
+ {
+ puts ("error for openat using descriptor for normal file not ENOTDIR ");
+ return 1;
+ }
+
+ close (fd);
+ puts ("file created");
+
+ /* fdopendir takes over the descriptor, make a copy. */
+ dupfd = dup (dir_fd);
+ if (dupfd == -1)
+ {
+ puts ("dup failed");
+ return 1;
+ }
+ if (lseek (dupfd, 0, SEEK_SET) != 0)
+ {
+ puts ("2nd lseek failed");
+ return 1;
+ }
+
+ /* The directory should be empty safe the . and .. files. */
+ dir = fdopendir (dupfd);
+ if (dir == NULL)
+ {
+ puts ("fdopendir failed");
+ return 1;
+ }
+ bool seen_file = false;
+ while ((d = readdir64 (dir)) != NULL)
+ if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
+ {
+ if (strcmp (d->d_name, "some-file") != 0)
+ {
+ printf ("temp directory contains file \"%s\"\n", d->d_name);
+ return 1;
+ }
+
+ seen_file = true;
+ }
+ closedir (dir);
+
+ if (!seen_file)
+ {
+ puts ("file not created in correct directory");
+ return 1;
+ }
+
+ int cwdfd = open (".", O_RDONLY | O_DIRECTORY);
+ if (cwdfd == -1)
+ {
+ puts ("cannot get descriptor for cwd");
+ return 1;
+ }
+
+ if (fchdir (dir_fd) != 0)
+ {
+ puts ("1st fchdir failed");
+ return 1;
+ }
+
+ if (unlink ("some-file") != 0)
+ {
+ puts ("unlink failed");
+ return 1;
+ }
+
+ if (fchdir (cwdfd) != 0)
+ {
+ puts ("2nd fchdir failed");
+ return 1;
+ }
+
+ close (dir_fd);
+ close (cwdfd);
+
+ /* With the file descriptor closed the next call must fail. */
+ fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
+ if (fd != -1)
+ {
+ puts ("openat using closed descriptor succeeded");
+ return 1;
+ }
+ if (errno != EBADF)
+ {
+ puts ("openat using closed descriptor did not set EBADF");
+ return 1;
+ }
+
+ fd = openat (-1, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
+ if (fd != -1)
+ {
+ puts ("openat using -1 descriptor succeeded");
+ return 1;
+ }
+ if (errno != EBADF)
+ {
+ puts ("openat using -1 descriptor did not set EBADF");
+ return 1;
+ }
+
+ return 0;
+}