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95 lines
2.8 KiB
C
95 lines
2.8 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 "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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/* 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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libc_freeres_ptr (static char *buffer);
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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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