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_sys_open()
Defined in rt_sys.h, the _sys_open() function opens a file.
Syntax
FILEHANDLE _sys_open(const char*name,intopenmode);
Usage
The _sys_open() function is required
by fopen() and freopen().
These functions in turn are required if any file input/output function
is to be used.
The openmode parameter is a bitmap whose bits
mostly correspond directly to the ISO mode specification. Target-dependent
extensions are possible, but freopen() must
also be extended.
Returns
The return value is –1 if an error occurs.