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timersub(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)

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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 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
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