1 /* Copyright (C) 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 #include <libc-lock.h>
25 /*******************************************************************\
26 |* Here we assume several symbols to be defined: *|
28 |* LOOKUP_TYPE - the return type of the function *|
30 |* FUNCTION_NAME - name of the non-reentrant function *|
32 |* DATABASE_NAME - name of the database the function accesses *|
33 |* (e.g., host, services, ...) *|
35 |* ADD_PARAMS - additional parameter, can vary in number *|
37 |* ADD_VARIABLES - names of additional parameter *|
39 |* BUFLEN - length of buffer allocated for the non *|
40 |* reentrant version *|
42 |* Optionally the following vars can be defined: *|
44 |* NEED_H_ERRNO - an extra parameter will be passed to point to *|
45 |* the global `h_errno' variable. *|
47 \*******************************************************************/
49 /* To make the real sources a bit prettier. */
50 #define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
51 #define APPEND_R(name) APPEND_R1 (name)
52 #define APPEND_R1(name) name##_r
53 #define INTERNAL(name) INTERNAL1 (name)
54 #define INTERNAL1(name) __##name
56 /* Sometimes we need to store error codes in the `h_errno' variable. */
58 # define H_ERRNO_PARM , int *h_errnop
59 # define H_ERRNO_VAR , &h_errno_tmp
66 /* Prototype for reentrant version we use here. */
67 extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf,
68 char *buffer, size_t buflen,
69 LOOKUP_TYPE **result H_ERRNO_PARM);
71 /* We need to protect the dynamic buffer handling. */
72 __libc_lock_define_initialized (static, lock);
76 FUNCTION_NAME (ADD_PARAMS)
79 static size_t buffer_size;
80 static LOOKUP_TYPE resbuf;
88 __libc_lock_lock (lock);
93 buffer = malloc (buffer_size);
97 && INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
98 buffer_size, &result H_ERRNO_VAR) != 0
100 && h_errno_tmp == NETDB_INTERNAL
105 buffer_size += BUFLEN;
106 new_buf = realloc (buffer, buffer_size);
109 /* We are out of memory. Free the current buffer so that the
110 process gets a chance for a normal termination. */
118 /* Release lock. Preserve error value. */
120 __libc_lock_unlock (lock);
124 if (h_errno_tmp != 0)
125 __set_h_errno (h_errno_tmp);