Defined in header <stddef.h>

If the macro constant __STDC_NO_THREADS__(C11) is defined by the compiler, the header <threads.h>

Defined in header <math.h>

Defined in header <ctype.h>

Defined in header <stdlib.h>

Defined in header <stdatomic.h>

The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial

Defined in header <wchar.h>

Defined in header <signal.h>

Defined in header <math.h>