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.
◆ EDOM
◆ ERANGE
◆ errno
Error code for last error encountered by library.
The variable errno
holds the last error code encountered by a library function. This variable must be cleared by the user prior to calling a library function.
- 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.