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88677348b4
They are both used by __libc_freeres to free all library malloc allocated resources to help tooling like mtrace or valgrind with memory leak tracking. The current scheme uses assembly markers and linker script entries to consolidate the free routine function pointers in the RELRO segment and to be freed buffers in BSS. This patch changes it to use specific free functions for libc_freeres_ptrs buffers and call the function pointer array directly with call_function_static_weak. It allows the removal of both the internal macros and the linker script sections. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/* NSS actions, elements in a nsswitch.conf configuration line.
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Copyright (c) 2020-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _NSS_ACTION_H
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#define _NSS_ACTION_H
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#include <stddef.h>
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/* See nss_database.h for a summary of how this relates. */
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#include "nsswitch.h" /* For lookup_actions. */
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struct nss_module;
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/* A NSS action pairs a service module with the action for each result
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state. */
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struct nss_action
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{
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/* The service module that provides the functionality (potentially
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not yet loaded). */
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struct nss_module *module;
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/* Action according to result. Two bits for each lookup_actions
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value (from nsswitch.h), indexed by enum nss_status (from nss.h). */
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unsigned int action_bits;
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};
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/* Value to add to first nss_status value to get zero. */
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#define NSS_STATUS_BIAS 2
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/* Number of bits per lookup action. */
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#define NSS_BPL 2
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#define NSS_BPL_MASK ((1 << NSS_BPL) - 1)
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/* Index in actions of an NSS status. Note that in nss/nss.h the
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status starts at -2, and we shift that up to zero by adding 2.
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Thus for example NSS_STATUS_TRYAGAIN, which is -2, would index into
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the 0th bit place as expected. */
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static inline int
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nss_actions_bits_index (enum nss_status status)
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{
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return NSS_BPL * (NSS_STATUS_BIAS + status);
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}
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/* Returns the lookup_action value for STATUS in ACTION. */
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static inline lookup_actions
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nss_action_get (const struct nss_action *action, enum nss_status status)
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{
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return ((action->action_bits >> nss_actions_bits_index (status))
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& NSS_BPL_MASK);
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}
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/* Sets the lookup_action value for STATUS in ACTION. */
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static inline void
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nss_action_set (struct nss_action *action,
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enum nss_status status, lookup_actions actions)
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{
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int offset = nss_actions_bits_index (status);
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unsigned int mask = NSS_BPL_MASK << offset;
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action->action_bits = ((action->action_bits & ~mask)
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| ((unsigned int) actions << offset));
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}
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static inline void
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nss_action_set_all (struct nss_action *action, lookup_actions actions)
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{
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unsigned int bits = actions & NSS_BPL_MASK;
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action->action_bits = ( bits
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| (bits << (NSS_BPL * 1))
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| (bits << (NSS_BPL * 2))
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| (bits << (NSS_BPL * 3))
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| (bits << (NSS_BPL * 4))
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);
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}
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/* A list of struct nss_action objects in array terminated by an
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action with a NULL module. */
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typedef struct nss_action *nss_action_list;
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/* Returns a pointer to an allocated NSS action list that has COUNT
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actions that matches the array at ACTIONS. */
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nss_action_list __nss_action_allocate (struct nss_action *actions,
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size_t count) attribute_hidden;
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/* Returns a pointer to a list allocated by __nss_action_allocate, or
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NULL on error. ENOMEM means a (temporary) memory allocation error,
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EINVAL means that LINE is syntactically invalid. */
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nss_action_list __nss_action_parse (const char *line);
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#endif /* _NSS_ACTION_H */
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