diff options
Diffstat (limited to 'nss/getXXent_r.c')
| -rw-r--r-- | nss/getXXent_r.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/nss/getXXent_r.c b/nss/getXXent_r.c new file mode 100644 index 0000000000..3d1e9593e6 --- /dev/null +++ b/nss/getXXent_r.c @@ -0,0 +1,222 @@ +/* Copyright (C) 1996 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +#include <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) APPEND_R1 (name) +#define APPEND_R1(name) name##_r + +#define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME) +#define GETFUNC_NAME_STRING STRINGIZE (GETFUNC_NAME) +#define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME) +#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) +#define STRINGIZE(name) STRINGIZE1 (name) +#define STRINGIZE1(name) #name + +#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup) +#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) +#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post + +/* 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 +#else +# define H_ERRNO_PARM +# define H_ERRNO_VAR +#endif + +/* Some databases take the `stayopen' flag. */ +#ifndef STAYOPEN +#define STAYOPEN void +#define STAYOPEN_VAR +#endif + +/* Prototype for the setXXXent functions we use here. */ +typedef int (*set_function) (STAYOPEN); + +/* Prototype for the endXXXent functions we use here. */ +typedef int (*end_function) (void); + +/* Prototype for the setXXXent functions we use here. */ +typedef int (*get_function) (LOOKUP_TYPE *, char *, int H_ERRNO_PARM); + + +/* This handle for the NSS data base is shared between all + set/get/endXXXent functions. */ +static service_user *nip; +/* Remember the first service_entry, it's always the same. */ +static service_user *startp; + +/* 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, void **fctp); + + +void +APPEND_R (SETFUNC_NAME) (STAYOPEN) +{ + set_function fct; + int no_more; + +#ifdef NEED__RES + if ((_res.options & RES_INIT) == 0 && res_init () == -1) + { + h_errno = NETDB_INTERNAL; + return NULL; + } +#endif /* need _res */ + + __libc_lock_lock (lock); + + if (startp == NULL) + { + no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct); + startp = no_more == 0 ? (service_user *) -1 : nip; + } + else + no_more = (nip = startp) != (service_user *) -1; + + /* Cycle through all the services and run their setXXent functions. */ + while (! no_more) + { + /* Ignore status, we force check in __NSS_NEXT. */ + (void) (*fct) (STAYOPEN_VAR); + + no_more = __nss_next (&nip, SETFUNC_NAME_STRING, (void **) &fct, 0, 1); + } + + __libc_lock_unlock (lock); +} + + +void +APPEND_R (ENDFUNC_NAME) (void) +{ + end_function fct; + int no_more; + +#ifdef NEED__RES + if ((_res.options & RES_INIT) == 0 && res_init () == -1) + { + h_errno = NETDB_INTERNAL; + return NULL; + } +#endif /* need _res */ + + __libc_lock_lock (lock); + + if (startp == NULL) + { + no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct); + startp = no_more == 0 ? (service_user *) -1 : nip; + } + else + no_more = (nip = startp) != (service_user *) -1; + + /* Cycle through all the services and run their endXXent functions. */ + while (no_more == 0) + { + /* Ignore status, we force check in __NSS_NEXT. */ + (void) (*fct) (); + + no_more = __nss_next (&nip, ENDFUNC_NAME_STRING, (void **) &fct, 0, 1); + } + + __libc_lock_unlock (lock); +} + + +LOOKUP_TYPE * +REENTRANT_GETNAME (LOOKUP_TYPE *result, char *buffer, int buflen H_ERRNO_PARM) +{ + get_function fct; + int no_more; + enum nss_status status = NSS_STATUS_NOTFOUND; + +#ifdef NEED__RES + if ((_res.options & RES_INIT) == 0 && res_init () == -1) + { + h_errno = NETDB_INTERNAL; + return NULL; + } +#endif /* need _res */ + + __libc_lock_lock (lock); + + if (nip) + /* Continuing a walk-through started before. */ + no_more = 0; + else + { + if (startp == NULL) + { + no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct); + startp = no_more == 0 ? (service_user *) -1 : nip; + } + else + no_more = (nip = startp) != (service_user *) -1; + + if (no_more != 0) + status = NSS_STATUS_UNAVAIL; + } + + while (no_more == 0) + { + status = (*fct) (result, buffer, buflen H_ERRNO_VAR); + + no_more = __nss_next (&nip, GETFUNC_NAME_STRING, (void **) &fct, + status, 0); + } + + __libc_lock_unlock (lock); + + return status == NSS_STATUS_SUCCESS ? result : NULL; +} |