ARM VERSION 1.2 Datový list stáhnout pdf (Strana 113)

The C and C++ Libraries

The default implementation of

__rt_entry

1. Sets up the heap and stack.

2. Initializes the C library.

3. Calls

main()

4. Shuts down the C library.

5. Exits.

__rt_entry

must end with a call to one of the following functions:

exit()

To get full

atexit()

handling and library shut down.

__rt_exit()

To correctly shut down the library, bypassing

atexit()

processing.

_sys_exit()

To exit directly to the execution environment, bypassing

atexit()

4.4.4 __rt_exit()

This function shuts down the library but does not call functions registered with

atexit()

Syntax

void __rt_exit(int code)

code

Is not used by the standard function.

Implementation

The exit functions differ in their handling of the libraryand

atexit()

functions:

exit()

Calls

atexit()

-registered functions and shuts down the library.

__rt_exit()

Shuts down the library but does not call

atexit()

functions.

_sys_exit()

Does not shut down the library or call

atexit()

functions.

Returns

The function does not return.

4.4.5 __rt_lib_init()

This is the library initialization function and is the companion to

__rt_lib_shutdown()

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