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TIMERADD(3)		 BSD Library Functions Manual		   TIMERADD(3)

NAME
     timeradd — operations on time structure

SYNOPSIS
     #include <sys/time.h>

     void
     timeradd(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timersub(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timerclear(struct timeval *tv);

     int
     timerisset(struct timeval *tv);

     int
     timercmp(struct timeval *a, struct timeval *b, CMP);

     void
     timespecadd(struct timespec *a, struct timespec *b,
	 struct timespec *res);

     void
     timespecsub(struct timespec *a, struct timespec *b,
	 struct timespec *res);

     void
     timespecclear(struct timespec *ts);

     int
     timespecisset(struct timespec *ts);

     int
     timespeccmp(struct timespec *a, struct timespec b, CMP);

DESCRIPTION
     These macros are provided for manipulating the timeval and timespec
     structures described in timeval(3).

     The timeradd() and timespecadd() macros add the time information stored
     in a to b, storing the result in res.  With timeradd() the results are
     simplified such that the value of res->tv_usec is always less than
     1,000,000 (1 second).  With timespecadd() the res->tv_nsec member of
     struct timespec is always less than 1,000,000,000.

     The timersub() and timespecsub() macros subtract the time information
     stored in b from a and store the resulting structure in res.

     The timerclear() and timespecclear() macros initialize the structures to
     midnight (0 hour) January 1st, 1970 (the Epoch).  In other words, they
     set the members of the structure to zero.

     The timerisset() and timespecisset() macros return true if the input
     structure is set to any time value other than the Epoch.

     The timercmp() and timespeccmp() macros compare a to b using the compari‐
     son operator given in CMP.	 The result of the comparison is returned.

SEE ALSO
     timeval(3)

HISTORY
     The timeradd() family of macros first appeared in NetBSD 1.1.  These were
     later ported to FreeBSD 2.2.6.  The timespec() family of macros first
     appeared in NetBSD 1.2.

BSD				 June 7, 2010				   BSD

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