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libc: Add mknod implementation

Browse Source 
https://pubs.opengroup.org/onlinepubs/007904875/functions/mknod.html

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2021-11-28 22:56:04 +08:00 committed by Abdelatif Guettouche
parent fae27cc945
commit 54eabf9616
3 changed files with 98 additions and 1 deletions
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1
include/sys/stat.h
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@ -172,6 +172,7 @@ extern "C"
int mkdir(FAR const char *pathname, mode_t mode);
int mkfifo(FAR const char *pathname, mode_t mode);
int mknod(FAR const char *path, mode_t mode, dev_t dev);
int stat(FAR const char *path, FAR struct stat *buf);
int lstat(FAR const char *path, FAR struct stat *buf);
int fstat(int fd, FAR struct stat *buf);

2
libs/libc/misc/Make.defs
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@ -20,7 +20,7 @@
# Add the internal C files to the build
CSRCS += lib_umask.c lib_utsname.c
CSRCS += lib_mknod.c lib_umask.c lib_utsname.c
CSRCS += lib_xorshift128.c lib_tea_encrypt.c lib_tea_decrypt.c
# Support for platforms that do not have long long types

96
libs/libc/misc/lib_mknod.c Normal file
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@ -0,0 +1,96 @@
/****************************************************************************
* libs/libc/misc/lib_mknod.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 <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mknod
*
* Description:
* The mknod() function shall create a new file named by the pathname to
* which the argument path points.
*
* The file type for path is OR'ed into the mode argument, and the
* application shall select one of the following symbolic constants:
*
* S_IFIFO FIFO-special
* S_IFCHR Character-special (non-portable)
* S_IFDIR Directory (non-portable)
* S_IFBLK Block-special (non-portable)
* S_IFREG Regular (non-portable)
*
* The only portable use of mknod() is to create a FIFO-special file.
* If mode is not S_IFIFO or dev is not 0, the behavior of mknod() is
* unspecified.
*
* The permissions for the new file are OR'ed into the mode argument.
*
* Input Parameters:
* pathname - The full path to node.
* mode - File type and permission
*
* Returned Value:
* 0 is returned on success; otherwise, -1 is returned with errno set
* appropriately.
*
****************************************************************************/
int mknod(FAR const char *path, mode_t mode, dev_t dev)
{
int ret = -1;
switch (mode & S_IFMT)
{
#if defined(CONFIG_PIPES) && CONFIG_DEV_FIFO_SIZE > 0
case S_IFIFO:
ret = mkfifo(path, mode & ~S_IFMT);
break;
#endif
case S_IFDIR:
ret = mkdir(path, mode & ~S_IFMT);
break;
case S_IFREG:
ret = creat(path, mode & ~S_IFMT);
if (ret >= 0)
{
ret = close(ret);
}
break;
default:
set_errno(EINVAL);
break;
}
return ret;
}