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timerclear (3)
  • timerclear (3) ( FreeBSD man: Библиотечные вызовы )
  • >> timerclear (3) ( Linux man: Библиотечные вызовы )
  •  

    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);
    
    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

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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