102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/****************************************************************************
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* libs/libc/grp/lib_getgrgidr.c
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Michael Jung <mijung@gmx.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <grp.h>
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#include "grp/lib_grp.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getgrgid_r
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*
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* Description:
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* The getgrgid_r() function searches the group database for an entry with
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* a matching gid and stores the retrieved group structure in the space
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* pointed to by grp.
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*
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* Input Parameters:
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* gid - The gid to return a group structure for.
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* grp - Pointer to the space to store the retrieved group structure in.
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* buf - The string fields pointed to by the group struct are stored here.
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* buflen - The length of buf in bytes.
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* result - Pointer to the resulting group struct, or NULL in case of fail.
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*
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* Returned Value:
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* On success getgrgid_r returns 0 and sets *result to grp. If no match
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* is found, 0 is returned and *result is set to NULL. In case of failure
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* an error number is returned.
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*
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****************************************************************************/
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int getgrgid_r(gid_t gid, FAR struct group *grp, FAR char *buf, size_t buflen,
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FAR struct group **result)
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{
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#ifdef CONFIG_LIBC_GROUP_FILE
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int ret;
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ret = grp_findby_gid(gid, grp, buf, buflen);
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if (ret != 1)
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{
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*result = NULL;
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return ret < 0 ? -ret : 0;
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}
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*result = grp;
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return 0;
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#else
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if (gid != ROOT_GID)
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{
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/* The only known group is 'root', which has a gid of 0. Thus, report
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* back that no match was found.
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*/
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*result = NULL;
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return 0;
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}
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return getgrbuf_r(ROOT_GID, ROOT_NAME, ROOT_PASSWD, grp, buf, buflen,
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result);
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#endif
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}
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