Проект OpenNet: MAN timerisset (3) Библиотечные вызовы (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

timerisset (3)

>> timerisset (3) ( FreeBSD man: Библиотечные вызовы )

timerisset (3) ( Linux man: Библиотечные вызовы )

BSD mandoc

NAME



timeradd

 
timersub

 
timerclear

 
timerisset

 
timercmp

 - operations on timevals

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);

DESCRIPTION

These macros are provided for manipulating Fa timeval structures for use with the gettimeofday(2) and settimeofday(2) calls. The structure is defined in #include <sys/time.h>
as:

struct timeval {
        long    tv_sec;         /* seconds since Jan. 1, 1970 */
        long    tv_usec;        /* and microseconds */
};

timeradd ();
adds the time information stored in Fa a to Fa b and stores the resulting Vt timeval in Fa res . The results are simplified such that the value of Fa res->tv_usec is always less than 1,000,000 (1 second).

timersub ();
subtracts the time information stored in Fa b from Fa a and stores the resulting Vt timeval in Fa res .

timerclear ();
initializes Fa tvp to midnight (0 hour) January 1st, 1970 (the Epoch).

timerisset ();
returns true if Fa tvp is set to any time value other than the Epoch.

timercmp ();
compares Fa a to Fa b using the comparison operator given in Fa CMP , and returns the result of that comparison.

HISTORY

The timeradd ();
family of macros were imported from Nx 1.1 , and appeared in Fx 2.2.6 .

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