/* Copyright (C) 1996-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. 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 <https://www.gnu.org/licenses/>. */ #include <errno.h> #include <libc-lock.h> #include <stdlib.h> #include "nsswitch.h" /*******************************************************************\ |* Here we assume several symbols to be defined: *| |* *| |* LOOKUP_TYPE - the return type of the function *| |* *| |* GETFUNC_NAME - name of the non-reentrant getXXXent function *| |* *| |* BUFLEN - size of static buffer *| |* *| |* Optionally the following vars can be defined: *| |* *| |* 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 INTERNAL(name) INTERNAL1 (name) #define INTERNAL1(name) __##name /* 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 NULL #endif /* Prototype of the reentrant version. */ extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM) attribute_hidden; /* We need to protect the dynamic buffer handling. */ __libc_lock_define_initialized (static, lock); /* This points to the static buffer used. */ libc_freeres_ptr (static char *buffer); LOOKUP_TYPE * GETFUNC_NAME (void) { static size_t buffer_size; static union { LOOKUP_TYPE l; void *ptr; } resbuf; LOOKUP_TYPE *result; int save; /* Get lock. */ __libc_lock_lock (lock); result = (LOOKUP_TYPE *) __nss_getent ((getent_r_function) INTERNAL (REENTRANT_GETNAME), &resbuf.ptr, &buffer, BUFLEN, &buffer_size, H_ERRNO_VAR); save = errno; __libc_lock_unlock (lock); __set_errno (save); return result; } nss_interface_function (GETFUNC_NAME)