nss/getXXent_r.c

   1 /* Copyright (C) 1996,97,98,99,2000,2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <bits/libc-lock.h>
  22
  23 #include "nsswitch.h"
  24
  25 /*******************************************************************\
  26 |* Here we assume several symbols to be defined:                   *|
  27 |*                                                                 *|
  28 |* LOOKUP_TYPE   - the return type of the function                 *|
  29 |*                                                                 *|
  30 |* SETFUNC_NAME  - name of the non-reentrant setXXXent function    *|
  31 |*                                                                 *|
  32 |* GETFUNC_NAME  - name of the non-reentrant getXXXent function    *|
  33 |*                                                                 *|
  34 |* ENDFUNC_NAME  - name of the non-reentrant endXXXent function    *|
  35 |*                                                                 *|
  36 |* DATABASE_NAME - name of the database the function accesses      *|
  37 |*                 (e.g., host, services, ...)                     *|
  38 |*                                                                 *|
  39 |* Optionally the following vars can be defined:                   *|
  40 |*                                                                 *|
  41 |* STAYOPEN      - variable declaration for setXXXent function     *|
  42 |*                                                                 *|
  43 |* STAYOPEN_VAR  - variable name for setXXXent function            *|
  44 |*                                                                 *|
  45 |* NEED_H_ERRNO  - an extra parameter will be passed to point to   *|
  46 |*                 the global `h_errno' variable.                  *|
  47 |*                                                                 *|
  48 \*******************************************************************/
  49
  50 /* To make the real sources a bit prettier.  */
  51 #define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
  52 #define APPEND_R(Name) CONCAT2_2 (Name, _r)
  53 #define INTERNAL(Name) CONCAT2_2 (__, Name)
  54 #define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post)
  55 #define CONCAT2_2(Pre, Post) Pre##Post
  56
  57 #define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME)
  58 #define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME)
  59 #define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME)
  60 #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
  61 #define STRINGIZE(Name) STRINGIZE1 (Name)
  62 #define STRINGIZE1(Name) #Name
  63
  64 #ifndef DB_LOOKUP_FCT
  65 # define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
  66 # define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
  67 # define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
  68 #endif
  69
  70 /* Sometimes we need to store error codes in the `h_errno' variable.  */
  71 #ifdef NEED_H_ERRNO
  72 # define H_ERRNO_PARM , int *h_errnop
  73 # define H_ERRNO_VAR , &h_errno
  74 # define H_ERRNO_VAR_P &h_errno
  75 #else
  76 # define H_ERRNO_PARM
  77 # define H_ERRNO_VAR
  78 # define H_ERRNO_VAR_P NULL
  79 #endif
  80
  81 /* Some databases take the `stayopen' flag.  */
  82 #ifdef STAYOPEN
  83 # define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp)
  84 # define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp)
  85 #else
  86 # define STAYOPEN void
  87 # define STAYOPEN_VAR 0
  88 # define STAYOPEN_TMPVAR NULL
  89 #endif
  90
  91 #ifndef NEED__RES
  92 # define NEED__RES 0
  93 #endif
  94
  95 /* This handle for the NSS data base is shared between all
  96    set/get/endXXXent functions.  */
  97 static service_user *nip;
  98 /* Remember the last service used since the last call to  `endXXent'.  */
  99 static service_user *last_nip;
 100 /* Remember the first service_entry, it's always the same.  */
 101 static service_user *startp;
 102
 103 #ifdef STAYOPEN_TMP
 104 /* We need to remember the last `stayopen' flag given by the user
 105    since the `setent' function is only called for the first available
 106    service.  */
 107 static STAYOPEN_TMP;
 108 #endif
 109
 110 /* Protect above variable against multiple uses at the same time.  */
 111 __libc_lock_define_initialized (static, lock)
 112
 113 /* The lookup function for the first entry of this service.  */
 114 extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp);
 115 \f
 116 void
 117 SETFUNC_NAME (STAYOPEN)
 118 {
 119   int save;
 120
 121   __libc_lock_lock (lock);
 122   __nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
 123                 &last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES);
 124
 125   save = errno;
 126   __libc_lock_unlock (lock);
 127   __set_errno (save);
 128 }
 129
 130
 131 void
 132 ENDFUNC_NAME (void)
 133 {
 134   int save;
 135
 136   __libc_lock_lock (lock);
 137   __nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp,
 138                 &last_nip, NEED__RES);
 139   save = errno;
 140   __libc_lock_unlock (lock);
 141   __set_errno (save);
 142 }
 143
 144
 145 int
 146 INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
 147                               LOOKUP_TYPE **result H_ERRNO_PARM)
 148 {
 149   int status;
 150   int save;
 151
 152   __libc_lock_lock (lock);
 153   status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING,
 154                            DB_LOOKUP_FCT, &nip, &startp, &last_nip,
 155                            STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer,
 156                            buflen, (void **) result, H_ERRNO_VAR_P);
 157   save = errno;
 158   __libc_lock_unlock (lock);
 159   __set_errno (save);
 160   return status;
 161 }
 162
 163
 164 #include <shlib-compat.h>
 165 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2)
 166 #define OLD(name) OLD1 (name)
 167 #define OLD1(name) __old_##name
 168
 169 int
 170 OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
 171                          LOOKUP_TYPE **result H_ERRNO_PARM)
 172 {
 173   int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen,
 174                                           result H_ERRNO_VAR);
 175
 176   if (ret != 0)
 177     ret = -1;
 178
 179   return ret;
 180 }
 181
 182 #define do_symbol_version(real, name, version) \
 183   compat_symbol (libc, real, name, version)
 184 do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0);
 185 #endif
 186
 187 #define do_default_symbol_version(real, name, version) \
 188   versioned_symbol (libc, real, name, version)
 189 do_default_symbol_version (INTERNAL (REENTRANT_GETNAME),
 190                            REENTRANT_GETNAME, GLIBC_2_1_2);