Datasheet

The C and C++ Libraries

4.10.3 _sys_open()

This function opens a file.

Syntax

FILEHANDLE _sys_open(const char *name, int openmode)

Implementation

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 ANSI

mode specification. See

rt_sys.h

for details. Target-dependent extensions are possible,

in which case

freopen()

must also be extended.

Returns

The return value is –1 if an error occurs.

4.10.4 _sys_close()

This function closes a file previously opened with

_sys_open()

Syntax

int _sys_close(FILEHANDLE fh)

Implementation

This function must be defined if any input/output functionis to be used.

Returns

The return value is 0 if successful. A nonzero value indicates an error.