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Интерактивная система просмотра системных руководств (man-ов)

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clock (3)
  • clock (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> clock (3) ( Solaris man: Библиотечные вызовы )
  • clock (3) ( FreeBSD man: Библиотечные вызовы )
  • clock (3) ( Русские man: Библиотечные вызовы )
  • clock (3) ( Linux man: Библиотечные вызовы )
  • clock (3) ( POSIX man: Библиотечные вызовы )
  • clock (8) ( Linux man: Команды системного администрирования )
  • Ключ clock обнаружен в базе ключевых слов.
  •  

    NAME

    clock - report CPU time used
     
    

    SYNOPSIS

    #include <time.h>
    
    clock_t clock(void);
    

     

    DESCRIPTION

    The clock() function returns the amount of CPU time (in microseconds) used since the first call to clock() in the calling process. The time reported is the sum of the user and system times of the calling process and its terminated child processes for which it has executed the wait(3C) function, the pclose(3C) function, or the system(3C) function.  

    RETURN VALUES

    Dividing the value returned by clock() by the constant CLOCKS_PER_SEC, defined in the <time.h> header, will give the time in seconds. If the process time used is not available or cannot be represented, clock returns the value (clock_t) -1.  

    USAGE

    The value returned by clock() is defined in microseconds for compatibility with systems that have CPU clocks with much higher resolution. Because of this, the value returned will wrap around after accumulating only 2147 seconds of CPU time (about 36 minutes).  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    times(2), popen(3C), system(3C), wait(3C), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    USAGE
    ATTRIBUTES
    SEE ALSO


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