1#ifndef ____sigset_t_defined
2#define ____sigset_t_defined
3
4#define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
5typedef struct
6{
7 unsigned long int __val[_SIGSET_NWORDS];
8} __sigset_t;
9
10#endif
11

source code of glibc/sysdeps/unix/sysv/linux/bits/types/__sigset_t.h