Update.

2002-02-25  Jakub Jelinek  <jakub@redhat.com>

	* libio/iofopen.c (__fopen_maybe_mmap): Set the initial
	position to fp->_offset if it is set.
	* stdio-common/Makefile (tests): Add tst-fdopen.
	* stdio-common/tst-fdopen.c: New test.

2002-02-25  Jakub Jelinek  <jakub@redhat.com>

	* libio/fileops.c (_IO_file_xsgetn_mmap): Handle reading from backup.
	* stdio-common/tst-ungetc.c (main): Add another test.

stdio-common/tst-fdopen.c

@@ -0,0 +1,49 @@
+/* Test for fdopen bugs.  */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define assert(x) \
+  if (!(x)) \
+    { \
+      fputs ("test failed: " #x "\n", stderr); \
+      retval = 1; \
+      goto the_end; \
+    }
+
+char buffer[256];
+
+int
+main (int argc, char *argv[])
+{
+  char *name;
+  FILE *fp = NULL;
+  int retval = 0;
+  int c, fd;
+
+  name = tmpnam (NULL);
+  fp = fopen (name, "w");
+  assert (fp != NULL)
+  fputs ("foobar and baz", fp);
+  fclose (fp);
+  fp = NULL;
+
+  fd = open (name, O_RDONLY);
+  assert (fd != -1);
+  assert (lseek (fd, 5, SEEK_SET) == 5);
+  /* The file position indicator associated with the new stream is set to
+     the position indicated by the file offset associated with the file
+     descriptor.  */
+  fp = fdopen (fd, "r");
+  assert (fp != NULL);
+  assert (getc (fp) == 'r');
+  assert (getc (fp) == ' ');
+
+the_end:
+  if (fp != NULL)
+    fclose (fp);
+  unlink (name);
+
+  return retval;
+}