| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1996-2016 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 | <http://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. */ |
| 57 | extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, |
| 58 | size_t buflen, LOOKUP_TYPE **result |
| 59 | H_ERRNO_PARM); |
| 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. */ |
| 65 | libc_freeres_ptr (static char *buffer); |
| 66 | |
| 67 | |
| 68 | LOOKUP_TYPE * |
| 69 | GETFUNC_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 | |
| 94 | nss_interface_function (GETFUNC_NAME) |