1#ifndef __sig_atomic_t_defined
2#define __sig_atomic_t_defined 1
3
4#include <bits/types.h>
5
6/* An integral type that can be modified atomically, without the
7 possibility of a signal arriving in the middle of the operation. */
8typedef __sig_atomic_t sig_atomic_t;
9
10#endif
11

source code of glibc/signal/bits/types/sig_atomic_t.h