a C standard library for fx Casio calculators
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#ifndef __BITS_SIGACTION_H__
# define __BITS_SIGACTION_H__
#include <stddef.h>
#include <stdint.h>
/* Values for the HOW argument to `sigprocmask'. */
#define SIG_BLOCK 0 /* Block signals. */
#define SIG_UNBLOCK 1 /* Unblock signals. */
#define SIG_SETMASK 2 /* Set the set of blocked signals. */
#endif /*__BITS_SIGACTION_H__*/