Manpage of TIMERADD

TIMERADD

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

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

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  

DESCRIPTION

The macros are provided to operate on timevalstructures, defined in <sys/time.h>as:

struct timeval {
    time_t      tv_sec;     /* seconds */
    suseconds_t tv_usec;    /* microseconds */
};

timeradd() adds the time values in aand b, and places the sum in the timevalpointed to by res. The result is normalized such that res->tv_usechas a value in the range 0 to 999,999.

timersub() subtracts the time value in bfrom the time value in a, and places the result in the timevalpointed to by res. The result is normalized such that res->tv_usechas a value in the range 0 to 999,999.

timerclear() zeros out the timevalstructure 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 timevalstructure pointed to by tvpcontains a nonzero value.

timercmp() compares the timer values in aand busing 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 CMPof >=, <=, and ==do not work; portable applications can instead use


    !timercmp(..., <)
    !timercmp(..., >)
    !timercmp(..., !=)  

RETURN VALUE

timerisset() and timercmp() return true (nonzero) or false (0).  

ERRORS

No errors are defined.  

CONFORMING TO

Not in POSIX.1. Present on most BSD derivatives.  

SEE ALSO

gettimeofday(2), time(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO

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