5826e8eeb1
The pw_gecos field is not specified in POSIX, but is
present on most implementations.
passwd file format:
name:uid:gid:gecos:dir:shell
ex: gdm❌127:133:Gnome Display Manager:/var/lib/gdm3:/bin/false
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/****************************************************************************
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* libs/libc/pwd/lib_getpwuidr.c
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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 <pwd.h>
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#include "pwd/lib_pwd.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getpwuid_r
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*
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* Description:
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* The getpwuid_r() function searches the user database for an entry with a
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* matching uid and stores the retrieved passwd structure in the space
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* pointed to by pwd.
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*
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* Input Parameters:
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* uid - The uid to return a passwd structure for.
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* pwd - Pointer to the space to store the retrieved passwd structure in.
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* buf - The string fields pointed to by the passwd struct are stored here.
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* buflen - The length of buf in bytes.
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* result - Pointer to the resulting passwd struct, or NULL in case of
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* fail.
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*
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* Returned Value:
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* On success getpwuid_r returns 0 and sets *result to pwd. 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 getpwuid_r(uid_t uid, FAR struct passwd *pwd, FAR char *buf,
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size_t buflen, FAR struct passwd **result)
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{
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#ifdef CONFIG_LIBC_PASSWD_FILE
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int ret;
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ret = pwd_findby_uid(uid, pwd, 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 = pwd;
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return 0;
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#else
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if (uid != ROOT_UID)
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{
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/* The only known user is 'root', which has a uid 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 getpwbuf_r(ROOT_UID, ROOT_GID, ROOT_NAME, ROOT_NAME, ROOT_DIR,
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ROOT_SHELL, pwd, buf, buflen, result);
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#endif
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}
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