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# <errno.h>: System Errors

## Defines
#define | EDOM 33
#define | ERANGE 34

## Detailed Description

     #include <errno.h>

Some functions in the library set the global variable `errno` when an error occurs. The file, `<errno.h>`, provides symbolic names for various error codes.

Warning:
  The `errno` global variable is not safe to use in a threaded or multi-task system. A race condition can occur if a task is interrupted between the call which sets `error` and when the task examines `errno`. If another task changes `errno` during this time, the result will be incorrect for the interrupted task.

## Define Documentation

#define EDOM 33

Domain error.

#define ERANGE 34

Range error.

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