89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_seteuid.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 <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: seteuid
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*
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* Description:
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* The seteuid() function sets the effective user ID of the calling task
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* group to uid.
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*
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* Input Parameters:
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* uid - User identity to set the various process' user ID attributes to.
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*
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* Returned Value:
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* Zero if successful and -1 in case of failure, in which case errno is set
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* appropriately.
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*
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****************************************************************************/
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int seteuid(uid_t uid)
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{
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#ifdef CONFIG_SCHED_USER_IDENTITY
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/* If we have real UID/GID support, then treat the effective user ID as
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* the real user ID.
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*/
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return setuid(uid);
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#else
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/* NuttX only supports the user identity 'root' with a uid value of 0. */
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if (uid == 0)
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{
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return 0;
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}
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/* All other uid values are considered invalid and not supported by the
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* implementation.
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*/
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set_errno(EINVAL);
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return -1;
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#endif
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}
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