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TIMERADD(3)                Linux Programmer's Manual               TIMERADD(3)



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: _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  repre-
       sents 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.
       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 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
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2009-02-26                       TIMERADD(3)

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