#ifndef BSD_SYS_TIME_TIMERSUB_H
#define BSD_SYS_TIME_TIMERSUB_H

#include <sys/time.h>	/* struct timeval timersub */

#if !defined timersub
#define	timersub(a, b, r) do {					\
	(r)->tv_sec	= (a)->tv_sec - (b)->tv_sec;		\
	(r)->tv_usec	= (a)->tv_usec - (b)->tv_usec;		\
	if ((r)->tv_usec < 0) {					\
		--(r)->tv_sec;					\
		(r)->tv_usec += 1000000;			\
	}							\
} while (0)
#endif

#endif /* BSD_SYS_TIME_TIMERSUB_H */