RTEMS 4.7.99.2 On-Line Library

RTEMS Filesystem Design Guide

6.4.2.3: memfile_read() for Regular Files

Corresponding Structure Element:

memfile_read()

Arguments:

rtems_libio_t     *iop,
void              *buffer,
unsigned32         count

File:

memfile.c

Description:

This routine will determine the jnode that is associated with this file.

It will then call IMFS_memfile_read() with the jnode, file position index, buffer and transfer count as arguments.

IMFS_memfile_read() will do the following:

• Verify that the jnode is associated with a memory file
• Verify that the destination of the read is valid
• Adjust the length of the read if it is too long
• Acquire data from the memory blocks associated with the file
• Update the access time for the data in the file

RTEMS Filesystem Design Guide

Copyright © 1988-2004 OAR Corporation