scsh-0.6/scsh/machine/sigset.h

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/* Convert between a lo24/hi integer-pair bitset and a sigset_t value.
** These macros are OS-dependent, and must be defined per-OS.
*/
#define make_sigset(maskp, hi, lo) (*maskp=((hi)<<24)|(lo))
/* Not a procedure: */
#define split_sigset(mask, hip, lop) \
((*(hip)=(mask>>24)&0xff), \
(*(lop)=(mask&0xffffff)))