diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/getXXbyYY.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/getXXbyYY.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/net/getXXbyYY.c b/newlib/libc/sys/linux/net/getXXbyYY.c new file mode 100644 index 000000000..4fa25fa14 --- /dev/null +++ b/newlib/libc/sys/linux/net/getXXbyYY.c @@ -0,0 +1,156 @@ +/* Copyright (C) 1996-2001,2003, 2004 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <assert.h> +#include <errno.h> +#define _IO_MTSAFE_IO +#include <bits/libc-lock.h> +#include <stdlib.h> +#include <resolv.h> + +#include "nsswitch.h" + +/*******************************************************************\ +|* Here we assume several symbols to be defined: *| +|* *| +|* LOOKUP_TYPE - the return type of the function *| +|* *| +|* FUNCTION_NAME - name of the non-reentrant function *| +|* *| +|* DATABASE_NAME - name of the database the function accesses *| +|* (e.g., host, services, ...) *| +|* *| +|* ADD_PARAMS - additional parameter, can vary in number *| +|* *| +|* ADD_VARIABLES - names of additional parameter *| +|* *| +|* BUFLEN - length of buffer allocated for the non *| +|* reentrant version *| +|* *| +|* 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_NAME APPEND_R (FUNCTION_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_tmp +# define H_ERRNO_VAR_P &h_errno_tmp +#else +# define H_ERRNO_PARM +# define H_ERRNO_VAR +# define H_ERRNO_VAR_P NULL +#endif + +#ifdef HAVE_AF +# define AF_VAL af +#else +# define AF_VAL AF_INET +#endif + +/* Prototype for reentrant version we use here. */ +extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, + char *buffer, size_t buflen, + LOOKUP_TYPE **result H_ERRNO_PARM); + +/* 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 * +FUNCTION_NAME (ADD_PARAMS) +{ + static size_t buffer_size; + static LOOKUP_TYPE resbuf; + LOOKUP_TYPE *result; +#ifdef NEED_H_ERRNO + int h_errno_tmp = 0; +#endif + + /* Get lock. */ + __libc_lock_lock (lock); + + if (buffer == NULL) + { + buffer_size = BUFLEN; + buffer = (char *) malloc (buffer_size); + } + +#ifdef HANDLE_DIGITS_DOTS + if (buffer != NULL) + { + if (__nss_hostname_digits_dots (name, &resbuf, &buffer, + &buffer_size, 0, &result, NULL, AF_VAL, + H_ERRNO_VAR_P)) + goto done; + } +#endif + + while (buffer != NULL + && (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer, + buffer_size, &result H_ERRNO_VAR) + == ERANGE) +#ifdef NEED_H_ERRNO + && h_errno_tmp == NETDB_INTERNAL +#endif + ) + { + char *new_buf; + buffer_size *= 2; + new_buf = (char *) realloc (buffer, buffer_size); + if (new_buf == NULL) + { + /* We are out of memory. Free the current buffer so that the + process gets a chance for a normal termination. */ + free (buffer); + errno = (ENOMEM); + } + buffer = new_buf; + } + + if (buffer == NULL) + result = NULL; + +#ifdef HANDLE_DIGITS_DOTS +done: +#endif + /* Release lock. */ + __libc_lock_unlock (lock); + +#ifdef NEED_H_ERRNO + if (h_errno_tmp != 0) + h_errno = (h_errno_tmp); +#endif + + return result; +} + +static_link_warning (FUNCTION_NAME) |