timeradd - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03
NAMEtimeradd, timersub, timercmp, timerclear, timerisset − timeval operations
LIBRARYStandard C library (libc, −lc)
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 *tvp);
int timerisset(struct timeval *tvp);int timercmp(struct timeval *a, struct timeval *b, CMP);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE
DESCRIPTIONThe 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 Epoch: 1970-01-01 00:00:00 +0000 (UTC). timerisset() returns true (nonzero) if either field of the timeval structure pointed to by tvp contains a nonzero value. timercmp() compares the timer values in a and b using the comparison operator CMP, and returns true (nonzero) or false (0) depending on the result of the comparison. Some systems (but not Linux/glibc), have a broken timercmp() implementation, in which CMP of >=, <=, and == do not work; portable applications can instead use !timercmp(..., <)
!timercmp(..., >)
!timercmp(..., !=)
RETURN VALUEtimerisset() and timercmp() return true (nonzero) or false (0).
ERRORSNo errors are defined.
STANDARDSNot in POSIX.1. Present on most BSD derivatives.
SEE ALSOgettimeofday(2), time(7) 0
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