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Time clock 200412/23/2023 ![]() ![]() The formal definition of UTC does not permit double leap The range seconds allows for positive or negative leap seconds. To obtain the number of clock ticks per second returned by the times() function,Īpplications should call sysconf(_SC_CLK_TCK). Tm_year is a signed value therefore, years before 1900 may be represented. The range for tm_sec allows for the occasional leap second. Inclusion of the header may make visible all symbols from the header. The following shall be declared as variables: Int timer_settime(timer_t, int, const struct itimerspec *restrict, Int timer_gettime(timer_t, struct itimerspec *) Int timer_create(clockid_t, struct sigevent *restrict, Size_t strftime(char *restrict, size_t, const char *restrict,Ĭhar *strptime(const char *restrict, const char *restrict, Int nanosleep(const struct timespec *, struct timespec *) Struct tm *localtime_r(const time_t *restrict, struct tm *restrict) Struct tm *gmtime_r(const time_t *restrict, struct tm *restrict) Int clock_settime(clockid_t, const struct timespec *) Int clock_nanosleep(clockid_t, int, const struct timespec *, Int clock_gettime(clockid_t, struct timespec *) ![]() Int clock_getres(clockid_t, struct timespec *) Int clock_getcpuclockid(pid_t, clockid_t *) char *asctime(const struct tm *) Ĭhar *asctime_r(const struct tm *restrict, char *restrict) The following shall be declared as functions and may also be defined as macros. The header shall provide a declaration for getdate_err. Systems, and it should not be assumed that CLOCKS_PER_SEC is a compile-time constant. The clock_t, size_t, time_t, clockid_t, and timer_t types shall be defined as described in Īlthough the value of CLOCKS_PER_SEC is required to be 1 million on all XSI-conformant systems, it may be variable on other The identifier for the system-wide monotonic clock, which is defined as a clock whose value cannot be set via clock_settime() and which cannot have backward clock jumps. For functions taking timer objects, this refers to the clock associated with the timer. TIMER_ABSTIME Flag indicating time is absolute. The following manifest constants shall be defined: CLOCK_REALTIME The identifier of the system-wide realtime clock. Struct timespec it_value Timer expiration. Members: struct timespec it_interval Timer period. The header shall also declare the itimerspec structure, which has at least the following The header shall declare the structure timespec, which has at least the following members: time_t tv_sec Seconds. The identifier of the CPU-time clock associated with the thread making a clock() or timer*() function call. The identifier of the CPU-time clock associated with the process making a clock() or CLOCKS_PER_SEC A number used to convert the value returned by the clock() function into The header shall define the following symbolic names: NULL Null pointer constant. ![]() The value of tm_isdst shall be positive if Daylight Savings Time is in effect, 0 if Daylight Savings Time is not inĮffect, and negative if the information is not available. The header shall declare the structure tm, which shall include at least the following members: int tm_sec Seconds. The appropriate feature test macro (see the System Interfaces volume of IEEE Std 1003.1-2001, Section 2.2, The Compilation Environment) to enable the visibility of these symbols in this Some of the functionality described on this reference page extends the ISO C standard. ![]()
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