glibc/nss/getXXent_r.c
Chris Metcalf 017678433c Suppress incorrect link warnings for NSS symbols
When glibc is built with --enable-static-nss, the warning that
using NSS symbols requires the nss shared objects to be present
is no longer true, as those symbols are built into libc.  Suppress
the warning for those symbols by providing a new macro
(nss_interface_function) for the NSS functions that is defined as
static_link_warning in the normal case, and empty for static NSS.
2012-10-30 14:14:33 -04:00

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/* Copyright (C) 1996-2000,2002,2004,2007, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <bits/libc-lock.h>
#include "nsswitch.h"
/*******************************************************************\
|* Here we assume several symbols to be defined: *|
|* *|
|* LOOKUP_TYPE - the return type of the function *|
|* *|
|* SETFUNC_NAME - name of the non-reentrant setXXXent function *|
|* *|
|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
|* *|
|* ENDFUNC_NAME - name of the non-reentrant endXXXent function *|
|* *|
|* DATABASE_NAME - name of the database the function accesses *|
|* (e.g., host, services, ...) *|
|* *|
|* Optionally the following vars can be defined: *|
|* *|
|* STAYOPEN - variable declaration for setXXXent function *|
|* *|
|* STAYOPEN_VAR - variable name for setXXXent function *|
|* *|
|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
|* the global `h_errno' variable. *|
|* *|
\*******************************************************************/
/* To make the real sources a bit prettier. */
#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
#define APPEND_R(Name) CONCAT2_2 (Name, _r)
#define INTERNAL(Name) CONCAT2_2 (__, Name)
#define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post)
#define CONCAT2_2(Pre, Post) Pre##Post
#define NEW(name) NEW1 (name)
#define NEW1(name) __new_##name
#define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME)
#define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME)
#define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME)
#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
#define STRINGIZE(Name) STRINGIZE1 (Name)
#define STRINGIZE1(Name) #Name
#ifndef DB_LOOKUP_FCT
# define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
# define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
# define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
#endif
/* Sometimes we need to store error codes in the `h_errno' variable. */
#ifdef NEED_H_ERRNO
# define H_ERRNO_PARM , int *h_errnop
# define H_ERRNO_VAR , &h_errno
# define H_ERRNO_VAR_P &h_errno
#else
# define H_ERRNO_PARM
# define H_ERRNO_VAR
# define H_ERRNO_VAR_P NULL
#endif
/* Some databases take the `stayopen' flag. */
#ifdef STAYOPEN
# define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp)
# define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp)
#else
# define STAYOPEN void
# define STAYOPEN_VAR 0
# define STAYOPEN_TMPVAR NULL
#endif
#ifndef NEED__RES
# define NEED__RES 0
#endif
/* This handle for the NSS data base is shared between all
set/get/endXXXent functions. */
static service_user *nip;
/* Remember the last service used since the last call to `endXXent'. */
static service_user *last_nip;
/* Remember the first service_entry, it's always the same. */
static service_user *startp;
#ifdef STAYOPEN_TMP
/* We need to remember the last `stayopen' flag given by the user
since the `setent' function is only called for the first available
service. */
static STAYOPEN_TMP;
#endif
/* Protect above variable against multiple uses at the same time. */
__libc_lock_define_initialized (static, lock)
/* The lookup function for the first entry of this service. */
extern int DB_LOOKUP_FCT (service_user **nip, const char *name,
const char *name2, void **fctp)
internal_function;
libc_hidden_proto (DB_LOOKUP_FCT)
void
SETFUNC_NAME (STAYOPEN)
{
int save;
__libc_lock_lock (lock);
__nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
&last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
}
void
ENDFUNC_NAME (void)
{
int save;
/* If the service has not been used before do not do anything. */
if (startp != NULL)
{
__libc_lock_lock (lock);
__nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
&last_nip, NEED__RES);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
}
}
int
INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
LOOKUP_TYPE **result H_ERRNO_PARM)
{
int status;
int save;
__libc_lock_lock (lock);
status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING,
DB_LOOKUP_FCT, &nip, &startp, &last_nip,
STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer,
buflen, (void **) result, H_ERRNO_VAR_P);
save = errno;
__libc_lock_unlock (lock);
__set_errno (save);
return status;
}
#ifdef NO_COMPAT_NEEDED
strong_alias (INTERNAL (REENTRANT_GETNAME), REENTRANT_GETNAME);
#else
# include <shlib-compat.h>
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2)
# define OLD(name) OLD1 (name)
# define OLD1(name) __old_##name
int
attribute_compat_text_section
OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
LOOKUP_TYPE **result H_ERRNO_PARM)
{
int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen,
result H_ERRNO_VAR);
if (ret != 0)
ret = -1;
return ret;
}
# define do_symbol_version(real, name, version) \
compat_symbol (libc, real, name, version)
do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0);
# endif
/* As INTERNAL (REENTRANT_GETNAME) may be hidden, we need an alias
in between so that the REENTRANT_GETNAME@@GLIBC_2.1.2 is not
hidden too. */
strong_alias (INTERNAL (REENTRANT_GETNAME), NEW (REENTRANT_GETNAME));
# define do_default_symbol_version(real, name, version) \
versioned_symbol (libc, real, name, version)
do_default_symbol_version (NEW (REENTRANT_GETNAME),
REENTRANT_GETNAME, GLIBC_2_1_2);
#endif
nss_interface_function (SETFUNC_NAME)
nss_interface_function (ENDFUNC_NAME)
nss_interface_function (REENTRANT_GETNAME)