513 lines
16 KiB
Diff
513 lines
16 KiB
Diff
commit 1a7fe2ebe52b3c8bf465d1756e69452d05c1c103
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon Aug 5 15:54:10 2019 +0200
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login: Remove utmp backend jump tables [BZ #23518]
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There is just one file-based implementation, so this dispatch
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mechanism is unnecessary. Instead of the vtable pointer
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__libc_utmp_jump_table, use a non-negative file_fd as the indicator
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that the backend is initialized.
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diff --git a/login/getutent_r.c b/login/getutent_r.c
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index 6a244ba6e0b86da7..44239ecb81bacea4 100644
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--- a/login/getutent_r.c
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+++ b/login/getutent_r.c
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@@ -23,115 +23,16 @@
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#include "utmp-private.h"
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-
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-/* Functions defined here. */
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-static int setutent_unknown (void);
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-static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);
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-static int getutid_r_unknown (const struct utmp *line, struct utmp *buffer,
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- struct utmp **result);
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-static int getutline_r_unknown (const struct utmp *id, struct utmp *buffer,
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- struct utmp **result);
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-static struct utmp *pututline_unknown (const struct utmp *data);
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-static void endutent_unknown (void);
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-
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-/* Initial Jump table. */
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-const struct utfuncs __libc_utmp_unknown_functions =
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-{
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- setutent_unknown,
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- getutent_r_unknown,
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- getutid_r_unknown,
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- getutline_r_unknown,
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- pututline_unknown,
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- endutent_unknown,
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- NULL
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-};
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-
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-/* Currently selected backend. */
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-const struct utfuncs *__libc_utmp_jump_table = &__libc_utmp_unknown_functions;
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-
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/* We need to protect the opening of the file. */
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__libc_lock_define_initialized (, __libc_utmp_lock attribute_hidden)
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-static int
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-setutent_unknown (void)
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-{
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- int result;
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-
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- result = (*__libc_utmp_file_functions.setutent) ();
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- if (result)
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- __libc_utmp_jump_table = &__libc_utmp_file_functions;
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-
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- return result;
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-}
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-
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-
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-static int
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-getutent_r_unknown (struct utmp *buffer, struct utmp **result)
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-{
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- /* The backend was not yet initialized. */
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- if (setutent_unknown ())
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- return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
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-
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- /* Not available. */
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- *result = NULL;
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- return -1;
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-}
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-
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-
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-static int
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-getutid_r_unknown (const struct utmp *id, struct utmp *buffer,
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- struct utmp **result)
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-{
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- /* The backend was not yet initialized. */
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- if (setutent_unknown ())
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- return (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
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-
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- /* Not available. */
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- *result = NULL;
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- return -1;
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-}
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-
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-
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-static int
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-getutline_r_unknown (const struct utmp *line, struct utmp *buffer,
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- struct utmp **result)
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-{
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- /* The backend was not yet initialized. */
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- if (setutent_unknown ())
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- return (*__libc_utmp_jump_table->getutline_r) (line, buffer, result);
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-
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- /* Not available. */
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- *result = NULL;
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- return -1;
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-}
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-
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-
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-static struct utmp *
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-pututline_unknown (const struct utmp *data)
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-{
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- /* The backend was not yet initialized. */
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- if (setutent_unknown ())
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- return (*__libc_utmp_jump_table->pututline) (data);
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-
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- /* Not available. */
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- return NULL;
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-}
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-
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-
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-static void
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-endutent_unknown (void)
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-{
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- /* Nothing to do. */
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-}
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-
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-
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void
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__setutent (void)
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{
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__libc_lock_lock (__libc_utmp_lock);
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- (*__libc_utmp_jump_table->setutent) ();
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+ __libc_setutent ();
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__libc_lock_unlock (__libc_utmp_lock);
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}
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@@ -145,7 +46,7 @@ __getutent_r (struct utmp *buffer, struct utmp **result)
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__libc_lock_lock (__libc_utmp_lock);
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- retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result);
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+ retval = __libc_getutent_r (buffer, result);
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__libc_lock_unlock (__libc_utmp_lock);
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@@ -162,7 +63,7 @@ __pututline (const struct utmp *data)
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__libc_lock_lock (__libc_utmp_lock);
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- buffer = (*__libc_utmp_jump_table->pututline) (data);
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+ buffer = __libc_pututline (data);
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__libc_lock_unlock (__libc_utmp_lock);
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@@ -177,8 +78,7 @@ __endutent (void)
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{
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__libc_lock_lock (__libc_utmp_lock);
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- (*__libc_utmp_jump_table->endutent) ();
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- __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
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+ __libc_endutent ();
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__libc_lock_unlock (__libc_utmp_lock);
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}
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diff --git a/login/getutid_r.c b/login/getutid_r.c
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index b7d3dbac75774b0a..8cb6b16d735e8265 100644
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--- a/login/getutid_r.c
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+++ b/login/getutid_r.c
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@@ -49,7 +49,7 @@ __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
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__libc_lock_lock (__libc_utmp_lock);
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- retval = (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
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+ retval = __libc_getutid_r (id, buffer, result);
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__libc_lock_unlock (__libc_utmp_lock);
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diff --git a/login/getutline_r.c b/login/getutline_r.c
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index 6996887f76b28816..5607c19ed2e1ca66 100644
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--- a/login/getutline_r.c
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+++ b/login/getutline_r.c
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@@ -36,7 +36,7 @@ __getutline_r (const struct utmp *line, struct utmp *buffer,
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__libc_lock_lock (__libc_utmp_lock);
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- retval = (*__libc_utmp_jump_table->getutline_r) (line, buffer, result);
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+ retval = __libc_getutline_r (line, buffer, result);
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__libc_lock_unlock (__libc_utmp_lock);
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diff --git a/login/updwtmp.c b/login/updwtmp.c
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index 56fb41916a776c0a..7ae96224ca789b6d 100644
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--- a/login/updwtmp.c
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+++ b/login/updwtmp.c
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@@ -29,7 +29,7 @@ __updwtmp (const char *wtmp_file, const struct utmp *utmp)
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{
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const char *file_name = TRANSFORM_UTMP_FILE_NAME (wtmp_file);
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- (*__libc_utmp_file_functions.updwtmp) (file_name, utmp);
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+ __libc_updwtmp (file_name, utmp);
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}
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libc_hidden_def (__updwtmp)
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weak_alias (__updwtmp, updwtmp)
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diff --git a/login/utmp-private.h b/login/utmp-private.h
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index bd8773984cfc56de..5c2048ee52dc3cee 100644
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--- a/login/utmp-private.h
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+++ b/login/utmp-private.h
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@@ -24,24 +24,17 @@
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#include <utmp.h>
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#include <libc-lock.h>
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-/* The structure describing the functions in a backend. */
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-struct utfuncs
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-{
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- int (*setutent) (void);
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- int (*getutent_r) (struct utmp *, struct utmp **);
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- int (*getutid_r) (const struct utmp *, struct utmp *, struct utmp **);
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- int (*getutline_r) (const struct utmp *, struct utmp *, struct utmp **);
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- struct utmp *(*pututline) (const struct utmp *);
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- void (*endutent) (void);
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- int (*updwtmp) (const char *, const struct utmp *);
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-};
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-
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-/* The tables from the services. */
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-extern const struct utfuncs __libc_utmp_file_functions attribute_hidden;
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-extern const struct utfuncs __libc_utmp_unknown_functions attribute_hidden;
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-
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-/* Currently selected backend. */
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-extern const struct utfuncs *__libc_utmp_jump_table attribute_hidden;
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+/* These functions check for initialization, but not perform any
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+ locking. */
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+int __libc_setutent (void) attribute_hidden;
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+int __libc_getutent_r (struct utmp *, struct utmp **) attribute_hidden;
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+int __libc_getutid_r (const struct utmp *, struct utmp *, struct utmp **)
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+ attribute_hidden;
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+int __libc_getutline_r (const struct utmp *, struct utmp *, struct utmp **)
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+ attribute_hidden;
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+struct utmp *__libc_pututline (const struct utmp *) attribute_hidden;
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+void __libc_endutent (void) attribute_hidden;
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+int __libc_updwtmp (const char *, const struct utmp *) attribute_hidden;
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/* Current file name. */
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extern const char *__libc_utmp_file_name attribute_hidden;
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diff --git a/login/utmp_file.c b/login/utmp_file.c
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index 040a5057116bb69d..069e6d0452e333ad 100644
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--- a/login/utmp_file.c
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+++ b/login/utmp_file.c
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@@ -105,37 +105,12 @@ static void timeout_handler (int signum) {};
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alarm (old_timeout); \
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} while (0)
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-
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-/* Functions defined here. */
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-static int setutent_file (void);
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-static int getutent_r_file (struct utmp *buffer, struct utmp **result);
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-static int getutid_r_file (const struct utmp *key, struct utmp *buffer,
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- struct utmp **result);
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-static int getutline_r_file (const struct utmp *key, struct utmp *buffer,
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- struct utmp **result);
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-static struct utmp *pututline_file (const struct utmp *data);
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-static void endutent_file (void);
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-static int updwtmp_file (const char *file, const struct utmp *utmp);
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-
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-/* Jump table for file functions. */
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-const struct utfuncs __libc_utmp_file_functions =
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-{
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- setutent_file,
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- getutent_r_file,
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- getutid_r_file,
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- getutline_r_file,
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- pututline_file,
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- endutent_file,
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- updwtmp_file
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-};
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-
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-
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#ifndef TRANSFORM_UTMP_FILE_NAME
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# define TRANSFORM_UTMP_FILE_NAME(file_name) (file_name)
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#endif
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-static int
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-setutent_file (void)
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+int
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+__libc_setutent (void)
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{
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if (file_fd < 0)
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{
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@@ -166,15 +141,19 @@ setutent_file (void)
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return 1;
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}
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+/* Preform initialization if necessary. */
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+static bool
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+maybe_setutent (void)
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+{
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+ return file_fd >= 0 || __libc_setutent ();
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+}
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-static int
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-getutent_r_file (struct utmp *buffer, struct utmp **result)
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+int
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+__libc_getutent_r (struct utmp *buffer, struct utmp **result)
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{
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ssize_t nbytes;
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- assert (file_fd >= 0);
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-
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- if (file_offset == -1l)
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+ if (!maybe_setutent () || file_offset == -1l)
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{
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/* Not available. */
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*result = NULL;
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@@ -279,13 +258,11 @@ unlock_return:
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/* For implementing this function we don't use the getutent_r function
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because we can avoid the reposition on every new entry this way. */
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-static int
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-getutid_r_file (const struct utmp *id, struct utmp *buffer,
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- struct utmp **result)
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+int
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+__libc_getutid_r (const struct utmp *id, struct utmp *buffer,
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+ struct utmp **result)
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{
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- assert (file_fd >= 0);
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-
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- if (file_offset == -1l)
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+ if (!maybe_setutent () || file_offset == -1l)
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{
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*result = NULL;
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return -1;
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@@ -309,13 +286,11 @@ getutid_r_file (const struct utmp *id, struct utmp *buffer,
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/* For implementing this function we don't use the getutent_r function
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because we can avoid the reposition on every new entry this way. */
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-static int
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-getutline_r_file (const struct utmp *line, struct utmp *buffer,
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- struct utmp **result)
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+int
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+__libc_getutline_r (const struct utmp *line, struct utmp *buffer,
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+ struct utmp **result)
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{
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- assert (file_fd >= 0);
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-
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- if (file_offset == -1l)
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+ if (!maybe_setutent () || file_offset == -1l)
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{
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*result = NULL;
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return -1;
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@@ -361,15 +336,16 @@ unlock_return:
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}
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-static struct utmp *
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-pututline_file (const struct utmp *data)
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+struct utmp *
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+__libc_pututline (const struct utmp *data)
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{
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+ if (!maybe_setutent ())
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+ return NULL;
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+
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struct utmp buffer;
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struct utmp *pbuf;
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int found;
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- assert (file_fd >= 0);
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-
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if (! file_writable)
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{
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/* We must make the file descriptor writable before going on. */
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@@ -467,18 +443,19 @@ pututline_file (const struct utmp *data)
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}
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-static void
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-endutent_file (void)
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+void
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+__libc_endutent (void)
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{
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- assert (file_fd >= 0);
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-
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- __close_nocancel_nostatus (file_fd);
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- file_fd = -1;
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+ if (file_fd >= 0)
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+ {
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+ __close_nocancel_nostatus (file_fd);
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+ file_fd = -1;
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+ }
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}
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-static int
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-updwtmp_file (const char *file, const struct utmp *utmp)
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+int
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+__libc_updwtmp (const char *file, const struct utmp *utmp)
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{
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int result = -1;
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off64_t offset;
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diff --git a/login/utmpname.c b/login/utmpname.c
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index 21cb890a1a2fdc92..73b19c33ceab4dd7 100644
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--- a/login/utmpname.c
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+++ b/login/utmpname.c
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@@ -42,8 +42,7 @@ __utmpname (const char *file)
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__libc_lock_lock (__libc_utmp_lock);
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/* Close the old file. */
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- (*__libc_utmp_jump_table->endutent) ();
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- __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
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+ __libc_endutent ();
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if (strcmp (file, __libc_utmp_file_name) != 0)
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{
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diff --git a/manual/users.texi b/manual/users.texi
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index 4ed79ba26fc8e9d0..a006bb58acfd0568 100644
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--- a/manual/users.texi
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+++ b/manual/users.texi
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@@ -894,9 +894,9 @@ The @code{getlogin} function is declared in @file{unistd.h}, while
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@c ttyname_r dup @ascuheap @acsmem @acsfd
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@c strncpy dup ok
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->setutent dup @mtasurace:utent @acsfd
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-@c *libc_utmp_jump_table->getutline_r dup @mtasurace:utent @mtascusig:ALRM @mtascutimer
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-@c *libc_utmp_jump_table->endutent dup @mtasurace:utent @asulock @aculock
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+@c __libc_setutent dup @mtasurace:utent @acsfd
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+@c __libc_getutline_r dup @mtasurace:utent @mtascusig:ALRM @mtascutimer
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+@c __libc_endutent dup @mtasurace:utent @asulock @aculock
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@c libc_lock_unlock dup ok
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@c strlen dup ok
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@c memcpy dup ok
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@@ -1111,7 +1111,7 @@ compatibility only, @file{utmp.h} defines @code{ut_time} as an alias for
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@c setutent @mtasurace:utent @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->setutent @mtasurace:utent @acsfd
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+@c __libc_setutent @mtasurace:utent @acsfd
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@c setutent_unknown @mtasurace:utent @acsfd
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@c *libc_utmp_file_functions.setutent = setutent_file @mtasurace:utent @acsfd
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@c open_not_cancel_2 dup @acsfd
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@@ -1152,7 +1152,7 @@ A null pointer is returned in case no further entry is available.
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@safety{@prelim{}@mtunsafe{@mtasurace{:utent}}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{}}}
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@c endutent @mtasurace:utent @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->endutent @mtasurace:utent @acsfd
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+@c __libc_endutent @mtasurace:utent @acsfd
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@c endutent_unknown ok
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@c endutent_file @mtasurace:utent @acsfd
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@c close_not_cancel_no_status dup @acsfd
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@@ -1230,7 +1230,7 @@ over again.
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@safety{@prelim{}@mtunsafe{@mtasurace{:utent} @mtascusig{:ALRM} @mtascutimer{}}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{}}}
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@c pututline @mtasurace:utent @mtascusig:ALRM @mtascutimer @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->pututline @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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+@c __libc_pututline @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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@c pututline_unknown @mtasurace:utent @acsfd
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@c setutent_unknown dup @mtasurace:utent @acsfd
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@c pututline_file @mtascusig:ALRM @mtascutimer @acsfd
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@@ -1282,7 +1282,7 @@ user-provided buffer.
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@safety{@prelim{}@mtunsafe{@mtasurace{:utent} @mtascusig{:ALRM} @mtascutimer{}}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{}}}
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@c getutent_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->getutent_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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+@c __libc_getutent_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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@c getutent_r_unknown @mtasurace:utent @acsfd
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@c setutent_unknown dup @mtasurace:utent @acsfd
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@c getutent_r_file @mtasurace:utent @mtascusig:ALRM @mtascutimer
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@@ -1319,7 +1319,7 @@ This function is a GNU extension.
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@safety{@prelim{}@mtunsafe{@mtasurace{:utent} @mtascusig{:ALRM} @mtascutimer{}}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{}}}
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@c getutid_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->getutid_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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+@c __libc_getutid_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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@c getutid_r_unknown @mtasurace:utent @acsfd
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@c setutent_unknown dup @mtasurace:utent @acsfd
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@c getutid_r_file @mtascusig:ALRM @mtascutimer
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@@ -1349,7 +1349,7 @@ This function is a GNU extension.
|
|
@safety{@prelim{}@mtunsafe{@mtasurace{:utent} @mtascusig{:ALRM} @mtascutimer{}}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{}}}
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@c getutline_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @asulock @aculock @acsfd
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->getutline_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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+@c __libc_getutline_r @mtasurace:utent @mtascusig:ALRM @mtascutimer @acsfd
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@c getutline_r_unknown @mtasurace:utent @acsfd
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@c setutent_unknown dup @mtasurace:utent @acsfd
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@c getutline_r_file @mtasurace:utent @mtascusig:ALRM @mtascutimer
|
|
@@ -1393,7 +1393,7 @@ be used.
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@safety{@prelim{}@mtunsafe{@mtasurace{:utent}}@asunsafe{@asulock{} @ascuheap{}}@acunsafe{@aculock{} @acsmem{}}}
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@c utmpname @mtasurace:utent @asulock @ascuheap @aculock @acsmem
|
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@c libc_lock_lock dup @asulock @aculock
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-@c *libc_utmp_jump_table->endutent dup @mtasurace:utent
|
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+@c __libc_endutent dup @mtasurace:utent
|
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@c strcmp dup ok
|
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@c free dup @ascuheap @acsmem
|
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@c strdup dup @ascuheap @acsmem
|
|
diff --git a/sysdeps/unix/getlogin_r.c b/sysdeps/unix/getlogin_r.c
|
|
index 444df7e4d3210cf6..180c0bbca13d0f87 100644
|
|
--- a/sysdeps/unix/getlogin_r.c
|
|
+++ b/sysdeps/unix/getlogin_r.c
|
|
@@ -64,8 +64,8 @@ __getlogin_r (char *name, size_t name_len)
|
|
held so that our search is thread-safe. */
|
|
|
|
__libc_lock_lock (__libc_utmp_lock);
|
|
- (*__libc_utmp_jump_table->setutent) ();
|
|
- result = (*__libc_utmp_jump_table->getutline_r) (&line, &buffer, &ut);
|
|
+ __libc_setutent ();
|
|
+ result = __libc_getutline_r (&line, &buffer, &ut);
|
|
if (result < 0)
|
|
{
|
|
if (errno == ESRCH)
|
|
@@ -74,8 +74,7 @@ __getlogin_r (char *name, size_t name_len)
|
|
else
|
|
result = errno;
|
|
}
|
|
- (*__libc_utmp_jump_table->endutent) ();
|
|
- __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
|
|
+ __libc_endutent ();
|
|
__libc_lock_unlock (__libc_utmp_lock);
|
|
|
|
if (result == 0)
|