login: Remove utmp backend jump tables [BZ #23518]

There is just one file-based implementation, so this dispatch
mechanism is unnecessary.  Instead of the vtable pointer
__libc_utmp_jump_table, use a non-negative file_fd as the indicator
that the backend is initialized.

1 files changed, 11 insertions, 18 deletions

diff --git a/login/utmp-private.h b/login/utmp-private.h
index a82a923657..d60461d644 100644
--- a/login/utmp-private.h
+++ b/login/utmp-private.h
@@ -24,24 +24,17 @@
 #include <utmp.h>
 #include <libc-lock.h>
 
-/* The structure describing the functions in a backend.  */
-struct utfuncs
-{
-  int (*setutent) (void);
-  int (*getutent_r) (struct utmp *, struct utmp **);
-  int (*getutid_r) (const struct utmp *, struct utmp *, struct utmp **);
-  int (*getutline_r) (const struct utmp *, struct utmp *, struct utmp **);
-  struct utmp *(*pututline) (const struct utmp *);
-  void (*endutent) (void);
-  int (*updwtmp) (const char *, const struct utmp *);
-};
-
-/* The tables from the services.  */
-extern const struct utfuncs __libc_utmp_file_functions attribute_hidden;
-extern const struct utfuncs __libc_utmp_unknown_functions attribute_hidden;
-
-/* Currently selected backend.  */
-extern const struct utfuncs *__libc_utmp_jump_table attribute_hidden;
+/* These functions check for initialization, but not perform any
+   locking.  */
+int __libc_setutent (void) attribute_hidden;
+int __libc_getutent_r (struct utmp *, struct utmp **) attribute_hidden;
+int __libc_getutid_r (const struct utmp *, struct utmp *, struct utmp **)
+  attribute_hidden;
+int __libc_getutline_r (const struct utmp *, struct utmp *, struct utmp **)
+  attribute_hidden;
+struct utmp *__libc_pututline (const struct utmp *) attribute_hidden;
+void __libc_endutent (void) attribute_hidden;
+int __libc_updwtmp (const char *, const struct utmp *) attribute_hidden;
 
 /* Current file name.  */
 extern const char *__libc_utmp_file_name attribute_hidden;