[incubator-nuttx] branch master updated: libc: Add mknod implementation

[ag...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

aguettouche pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new 54eabf9  libc: Add mknod implementation
54eabf9 is described below

commit 54eabf9616aa6b26c37a0d4c7aeea86ced7c9bc9
Author: Xiang Xiao <xi...@xiaomi.com>
AuthorDate: Sun Nov 28 22:56:04 2021 +0800

    libc: Add mknod implementation
    
    https://pubs.opengroup.org/onlinepubs/007904875/functions/mknod.html
    
    Signed-off-by: Xiang Xiao <xi...@xiaomi.com>
---
 include/sys/stat.h         |  1 +
 libs/libc/misc/Make.defs   |  2 +-
 libs/libc/misc/lib_mknod.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/include/sys/stat.h b/include/sys/stat.h
index 89c35da..53b8772 100644
--- a/include/sys/stat.h
+++ b/include/sys/stat.h
@@ -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);
diff --git a/libs/libc/misc/Make.defs b/libs/libc/misc/Make.defs
index e1331fc..e6c3e6f 100644
--- a/libs/libc/misc/Make.defs
+++ b/libs/libc/misc/Make.defs
@@ -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
diff --git a/libs/libc/misc/lib_mknod.c b/libs/libc/misc/lib_mknod.c
new file mode 100644
index 0000000..3ddb81b
--- /dev/null
+++ b/libs/libc/misc/lib_mknod.c
@@ -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;
+}