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timerisset
Langue: en
Version: 2007-07-31 (ubuntu - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
timeradd, timersub, timercmp, timerclear, timerisset - timeval operationsSYNOPSIS
#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 *tvp); void timerisset(struct timeval *tvp); void timercmp(struct timeval *a, struct timeval *b, CMP);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
All functions shown above: _BSD_SOURCE
DESCRIPTION
The macros are provided to operate on timeval structures, defined in <sys/time.h> as:struct timeval { time_t tv_sec; /* seconds */ suseconds_t tv_usec; /* microseconds */ };
timeradd() adds the time values in a and b, and places the sum in the timeval pointed to by res. The result is normalized such that res->tv_usec has a value in the range 0 to 999,999.
timersub() subtracts the time value in b from the time value in a, and places the result in the timeval pointed to by res. The result is normalized such that res->tv_usec has a value in the range 0 to 999,999.
timerclear() zeros out the timeval structure pointed to by tvp, so that it represents the time at midnight on the morning of 1 January 1970 (the Epoch).
timerisset() returns true (non-zero) if either field of the timeval structure pointed to by tvp contains a non-zero value.
timercmp() compares the timer values in a and b using the comparison operator CMP, and returns true (non-zero) or false (0) depending on the result of the comparison.
RETURN VALUE
timerisset() and timercmp() return true (non-zero) or false (0).ERRORS
No errors are defined.CONFORMING TO
Not in POSIX.1-2001. Present on most BSD derivatives.SEE ALSO
gettimeofday(2), time(7)COLOPHON
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