__raise()

Defined in rt_misc.h, this function raises a signal to indicate a runtime anomaly. It is not part of the C library standard, but the ARM C library supports it as an extension.

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int __raise(int signal, int type);

where:

signal

is an integer that holds the signal number.

type

is an integer, string constant or variable that provides additional information about the circumstances that the signal was raised in, for some kinds of signal.

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If you have configured the handling of the signal by calling signal() then __raise() takes the user-specified action. That is, either to ignore the signal or to call the user-provided handler function. Otherwise, __raise() calls __default_signal_handler(), which provides the default signal handling behavior.

You can replace the __raise() function by defining:

int __raise(int signal, int type);

This enables you to bypass the C signal mechanism and its data-consuming signal handler vector, but otherwise gives essentially the same interface as:

int __default_signal_handler(int signal, int type);

The default signal handler of the library uses the type parameter of __raise() to vary the messages it outputs.

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There are three possibilities for a __raise() return condition:

no return

The handler performs a long jump or restart.

0

The signal was handled.

nonzero

The calling code must pass that return value to the exit code. The default library implementation calls _sys_exit(rc) if __raise() returns a nonzero return code rc.

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