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ARM Compiler ARM C and C++ Libraries and Floating-Point Support User Guide : _sys_open()

_sys_open()

Defined in rt_sys.h, the _sys_open() function opens a file.

Syntax

FILEHANDLE _sys_open(const char *name, int openmode);

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.

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