ARM Compiler toolchain v4.1 for µVision ARM C and C++ Libraries and Floating-Point Support Reference: _sys_open()

ARM Compiler toolchain v4.1 for µVision ARM C and C++ Libraries and Floating-Point Support Reference

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`_sys_open()`

Defined in rt_sys.h, this 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.

See also

Reference

Using ARM^® C and C++ Libraries and Floating-Point Support:

Direct semihosting C library function dependencies.

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