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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>
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/* Copyright (C) 1996-2023 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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#include <errno.h>
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#include <libc-lock.h>
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#include <stdlib.h>
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#include <set-freeres.h>
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#include "nsswitch.h"
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/*******************************************************************\
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|* Here we assume several symbols to be defined: *|
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|* *|
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|* LOOKUP_TYPE - the return type of the function *|
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|* *|
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|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
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|* *|
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|* BUFLEN - size of static buffer *|
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|* *|
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|* Optionally the following vars can be defined: *|
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|* *|
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|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
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|* the global `h_errno' variable. *|
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|* *|
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\*******************************************************************/
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/* To make the real sources a bit prettier. */
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#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
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#define APPEND_R(name) APPEND_R1 (name)
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#define APPEND_R1(name) name##_r
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#define INTERNAL(name) INTERNAL1 (name)
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#define INTERNAL1(name) __##name
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#define APPEND_FREEMEM_NAME1(name) __libc_##name##_freemem_ptr
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#define APPEND_FREEMEM_NAME(name) APPEND_FREEMEM_NAME1(name)
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#define FREEMEM_NAME APPEND_FREEMEM_NAME (GETFUNC_NAME)
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/* Sometimes we need to store error codes in the `h_errno' variable. */
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#ifdef NEED_H_ERRNO
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# define H_ERRNO_PARM , int *h_errnop
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# define H_ERRNO_VAR &h_errno
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#else
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# define H_ERRNO_PARM
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# define H_ERRNO_VAR NULL
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#endif
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/* Prototype of the reentrant version. */
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extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,
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size_t buflen, LOOKUP_TYPE **result
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H_ERRNO_PARM) attribute_hidden;
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/* We need to protect the dynamic buffer handling. */
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__libc_lock_define_initialized (static, lock);
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/* This points to the static buffer used. */
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static char *buffer;
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weak_alias (buffer, FREEMEM_NAME)
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LOOKUP_TYPE *
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GETFUNC_NAME (void)
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{
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static size_t buffer_size;
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static union
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{
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LOOKUP_TYPE l;
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void *ptr;
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} resbuf;
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LOOKUP_TYPE *result;
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int save;
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/* Get lock. */
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__libc_lock_lock (lock);
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result = (LOOKUP_TYPE *)
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__nss_getent ((getent_r_function) INTERNAL (REENTRANT_GETNAME),
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&resbuf.ptr, &buffer, BUFLEN, &buffer_size,
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H_ERRNO_VAR);
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save = errno;
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__libc_lock_unlock (lock);
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__set_errno (save);
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return result;
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}
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nss_interface_function (GETFUNC_NAME)
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