Move pipe() and mkpipe() to nuttx/libc. Change syscalls to pipe2() and mkfifo2()

drivers/pipes/fifo.c

@@ -130,38 +130,4 @@ int mkfifo2(FAR const char *pathname, mode_t mode, size_t bufsize)
   return ret;
 }
 
-/****************************************************************************
- * Name: mkfifo
- *
- * Description:
- *   mkfifo() makes a FIFO device driver file with name 'pathname.'  Unlike
- *   Linux, a NuttX FIFO is not a special file type but simply a device
- *   driver instance.  'mode' specifies the FIFO's permissions.
- *
- *   Once the FIFO has been created by mkfifo(), any thread can open it for
- *   reading or writing, in the same way as an ordinary file. However, it
- *   must have been opened from both reading and writing before input or
- *   output can be performed.  This FIFO implementation will block all
- *   attempts to open a FIFO read-only until at least one thread has opened
- *   the FIFO for  writing.
- *
- *   If all threads that write to the FIFO have closed, subsequent calls to
- *   read() on the FIFO will return 0 (end-of-file).
- *
- * Inputs:
- *   pathname - The full path to the FIFO instance to attach to or to create
- *     (if not already created).
- *   mode - Ignored for now
- *
- * Return:
- *   0 is returned on success; otherwise, -1 is returned with errno set
- *   appropriately.
- *
- ****************************************************************************/
-
-int mkfifo(FAR const char *pathname, mode_t mode)
-{
-  return mkfifo2(pathname, mode, CONFIG_DEV_FIFO_SIZE);
-}
-
 #endif /* CONFIG_DEV_FIFO_SIZE > 0 */

drivers/pipes/pipe.c

@@ -294,26 +294,4 @@ errout:
   return ERROR;
 }
 
-/****************************************************************************
- * Name: pipe2
- *
- * Description:
- *   pipe() creates a pair of file descriptors, pointing to a pipe inode,
- *   and  places them in the array pointed to by 'fd'. fd[0] is for reading,
- *   fd[1] is for writing.
- *
- * Inputs:
- *   fd[2] - The user provided array in which to catch the pipe file
- *   descriptors
- *
- * Return:
- *   0 is returned on success; otherwise, -1 is returned with errno set
- *   appropriately.
- *
- ****************************************************************************/
-
-int pipe(int fd[2])
-{
-  return pipe2(fd, CONFIG_DEV_PIPE_SIZE);
-}
 #endif /* CONFIG_DEV_PIPE_SIZE > 0 */