You copied the Doc URL to your clipboard.
Modification of C library functions for error signaling, error handling, and program exit
All trap or error signals raised by the C library go through the __raise()
function. You can re-implement this function or the lower-level functions that it uses.
Caution
The IEEE 754 standard for floating-point processing states that the default response to an exception is to proceed without a trap. You can modify floating-point error handling by tailoring the functions and definitions in fenv.h.
The rt_misc.h header file contains more information on error-related functions.
The following table shows the trap and error-handling functions.
Table 1-9 Trap and error handling
Function | Description |
---|---|
_sys_exit() |
Called, eventually, by all exits from the library. |
errno |
Is a static variable used with error handling. |
__rt_errno_addr() |
Is called to obtain the address of the variable errno . |
__raise() |
Raises a signal to indicate a runtime anomaly. |
__rt_raise() |
Raises a signal to indicate a runtime anomaly. |
__default_signal_handler() |
Displays an error indication to the user. |
_ttywrch() |
Writes a character to the console. The default implementation
of _ttywrch() is semihosted and, therefore,
uses semihosting calls. |
__rt_fp_status_addr() |
This function is called to obtain the address of the floating-point status word. |