Implement execve: save the existing info in shared memory and load it back
Fix staging files naming
Fix corner case scenario for dup2 where relink fails
Handle invalid pointer in open, rename, truncate
Bug in path resolution where required '/' was not included.
Bug in path resolution where null character was not appended after readlink
Bug in path resolution where the string buffer was not large enough -- changed from 256 to 4096
Fix bug in fallocate for staging files (number of arguments)
Fix bug in dup2 where the new fd vinode was being unref'd after the dup2 process, this causes new file to be closed in kernel. Moved this to caller. Also this is not required for dup and fcntl dup