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libc: Implement umask function

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Here is the spec:
https://pubs.opengroup.org/onlinepubs/009695399/functions/umask.html
Note: The simple implementaton is enough since
      NuttX doesn't really support the permission

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2020-09-14 14:20:13 +08:00 committed by Matias N
parent e681396d35
commit 027e2eed28
3 changed files with 60 additions and 1 deletions
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2
include/sys/stat.h
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@ -168,6 +168,8 @@ int fstat(int fd, FAR struct stat *buf);
int chmod(FAR const char *path, mode_t mode); int chmod(FAR const char *path, mode_t mode);
int fchmod(int fd, mode_t mode); int fchmod(int fd, mode_t mode);
mode_t umask(mode_t mask);
#undef EXTERN #undef EXTERN
#if defined(__cplusplus) #if defined(__cplusplus)
} }

2
libs/libc/misc/Make.defs
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@ -36,7 +36,7 @@
# Add the internal C files to the build # Add the internal C files to the build
CSRCS += lib_stream.c lib_utsname.c CSRCS += lib_stream.c lib_umask.c lib_utsname.c
CSRCS += lib_xorshift128.c lib_tea_encrypt.c lib_tea_decrypt.c CSRCS += lib_xorshift128.c lib_tea_encrypt.c lib_tea_decrypt.c
ifneq ($(CONFIG_STDIO_DISABLE_BUFFERING),y) ifneq ($(CONFIG_STDIO_DISABLE_BUFFERING),y)

57
libs/libc/misc/lib_umask.c Normal file
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@ -0,0 +1,57 @@
/****************************************************************************
* libs/libc/misc/lib_umask.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/stat.h>
/****************************************************************************
* Private Data
****************************************************************************/
static mode_t g_mask;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: umask
*
* Description:
* Set and get the file mode creation mask
*
* Input Parameters:
* mask - The process' file mode creation mask
*
* Returned Value:
* The previous value of the mask.
*
****************************************************************************/
mode_t umask(mode_t mask)
{
mode_t prev = g_mask;
g_mask = mask & 0777;
return prev;
}