| TIMERADD(3bsd) | 3bsd | TIMERADD(3bsd) |
timeradd,
timersub, timerclear,
timerisset, timercmp,
timespecadd, timespecsub,
timespecclear,
timespecisset, timespeccmp
— operations on time structure
library “libbsd”
#include
<sys/time.h> (See libbsd(7)
for include usage.)
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);
These macros are provided for manipulating the timeval and timespec structures described in timeval(3bsd).
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.
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.
| June 7, 2010 | Debian |