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9704481224
Add getgroups() to the C library. NuttX has no supplementary group IDs, so it reports a single group, the effective group ID, and follows POSIX for the gidsetsize == 0 and short-buffer (EINVAL) cases. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_getgroups.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <unistd.h>
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#include <errno.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getgroups
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*
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* Description:
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* The getgroups() function returns the supplementary group IDs of the
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* calling process in the array grouplist. NuttX does not support
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* supplementary group IDs, so the calling process is treated as belonging
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* to a single group: its effective group ID.
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*
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* Input Parameters:
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* gidsetsize - The number of elements available in grouplist.
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* grouplist - The buffer used to return the group IDs.
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*
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* Returned Value:
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* On success, the number of group IDs is returned. If gidsetsize is zero,
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* the total number of group IDs is returned without modifying grouplist.
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* On failure, -1 is returned and errno is set appropriately.
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*
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****************************************************************************/
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int getgroups(int gidsetsize, gid_t grouplist[])
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{
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if (gidsetsize < 0)
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{
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set_errno(EINVAL);
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return -1;
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}
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/* If gidsetsize is zero, return the number of group IDs without touching
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* grouplist.
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*/
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if (gidsetsize == 0)
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{
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return 1;
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}
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if (grouplist == NULL)
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{
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set_errno(EFAULT);
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return -1;
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}
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/* NuttX has no notion of supplementary group IDs. Report the single
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* effective group ID of the calling process.
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*/
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grouplist[0] = getegid();
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return 1;
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}
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