1/* Copyright (C) 1996-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <libc-lock.h>
20#include <stdlib.h>
21
22#include "nsswitch.h"
23
24/*******************************************************************\
25|* Here we assume several symbols to be defined: *|
26|* *|
27|* LOOKUP_TYPE - the return type of the function *|
28|* *|
29|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
30|* *|
31|* BUFLEN - size of static buffer *|
32|* *|
33|* Optionally the following vars can be defined: *|
34|* *|
35|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
36|* the global `h_errno' variable. *|
37|* *|
38\*******************************************************************/
39
40/* To make the real sources a bit prettier. */
41#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
42#define APPEND_R(name) APPEND_R1 (name)
43#define APPEND_R1(name) name##_r
44#define INTERNAL(name) INTERNAL1 (name)
45#define INTERNAL1(name) __##name
46
47/* Sometimes we need to store error codes in the `h_errno' variable. */
48#ifdef NEED_H_ERRNO
49# define H_ERRNO_PARM , int *h_errnop
50# define H_ERRNO_VAR &h_errno
51#else
52# define H_ERRNO_PARM
53# define H_ERRNO_VAR NULL
54#endif
55
56/* Prototype of the reentrant version. */
57extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,
58 size_t buflen, LOOKUP_TYPE **result
59 H_ERRNO_PARM) attribute_hidden;
60
61/* We need to protect the dynamic buffer handling. */
62__libc_lock_define_initialized (static, lock);
63
64/* This points to the static buffer used. */
65libc_freeres_ptr (static char *buffer);
66
67
68LOOKUP_TYPE *
69GETFUNC_NAME (void)
70{
71 static size_t buffer_size;
72 static union
73 {
74 LOOKUP_TYPE l;
75 void *ptr;
76 } resbuf;
77 LOOKUP_TYPE *result;
78 int save;
79
80 /* Get lock. */
81 __libc_lock_lock (lock);
82
83 result = (LOOKUP_TYPE *)
84 __nss_getent ((getent_r_function) INTERNAL (REENTRANT_GETNAME),
85 &resbuf.ptr, &buffer, BUFLEN, &buffer_size,
86 H_ERRNO_VAR);
87
88 save = errno;
89 __libc_lock_unlock (lock);
90 __set_errno (save);
91 return result;
92}
93
94nss_interface_function (GETFUNC_NAME)
95