timerclear(3c) [opensolaris man page]

timeradd(3C)						   Standard C Library Functions 					      timeradd(3C)

NAME

       timeradd, timersub, timerclear, timerisset, timercmp - operations on timeval structures

SYNOPSIS

       #include <sys/time.h>

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

       void timerclear(struct timeval *tvp);

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

       int timerisset(struct timeval *tvp);

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

DESCRIPTION

       These macros are provided for manipulating timeval structures for use with gettimeofday(3C) and settimeofday(3C) operands. The structure is
       defined in <sys/time.h> as:

	 struct timeval {
	     long    tv_sec;	 /* seconds since Jan. 1, 1970 */
	     long    tv_usec;	 /* and microseconds */
	 };

       The timeradd() macro adds the time information stored in a to b and stores the resulting timeval in res. The results  are  simplified  such
       that the value of res->tv_usec is always less than 1,000,000 (1 second).

       The timersub() macro subtracts the time information stored in b from a and stores the resulting timeval in res.

       The timerclear() macro initializes tvp to midnight (0 hour) January 1st, 1970 (the Epoch).

       The timerisset() macro returns true if tvp is set to any time value other than the Epoch.

       The timercmp() macro compares a to b using the form a CMP b, where CMP is one of <, <=, ==, !=, >=, or >.

USAGE

       These macros are not available in function form. All of these macros evaluate their arguments more than once. If parameters passed to these
       macros are expressions with side effects, the results are undefined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe with Exceptions	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gettimeofday(3C), attributes(5)

SunOS 5.11							    12 Jun 2008 						      timeradd(3C)

Check Out this Related Man Page

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 comparison 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

Linux and UNIX Man Pages

timerclear(3c) [opensolaris man page]

Check Out this Related Man Page