clock_gettime man page on SmartOS

Man page or keyword search:  
man Server   16655 pages
apropos Keyword Search (all sections)
Output format
SmartOS logo
[printable version]


       clock_settime,  clock_gettime,  clock_getres  -	high-resolution	 clock

       #include <time.h>

       int clock_settime(clockid_t clock_id, const struct timespec *tp);

       int clock_gettime(clockid_t clock_id, struct timespec *tp);

       int clock_getres(clockid_t clock_id, struct timespec *res);

       The clock_settime() function sets the specified clock, clock_id, to the
       value  specified	 by  tp.  Time values that are between two consecutive
       non-negative integer multiples of the resolution of the specified clock
       are truncated down to the smaller multiple of the resolution.

       The clock_gettime() function returns the current value tp for the spec‐
       ified clock, clock_id.

       The resolution of any clock can be obtained by calling  clock_getres().
       Clock  resolutions are system-dependent and cannot be set by a process.
       If the argument res is not NULL, the resolution of the specified	 clock
       is  stored in the location pointed to by res. If res is NULL, the clock
       resolution is not returned. If the time argument of clock_settime()  is
       not  a  multiple	 of  res, then the value is truncated to a multiple of

       A clock may be systemwide (that is, visible to all processes)  or  per-
       process (measuring time that is meaningful only within a process).

       A  clock_id of CLOCK_REALTIME is defined in <time.h>. This clock repre‐
       sents the realtime clock for the system. For  this  clock,  the	values
       returned	 by clock_gettime() and specified by clock_settime() represent
       the amount of time (in seconds and nanoseconds) since the Epoch.	 Addi‐
       tional  clocks may also be supported. The interpretation of time values
       for these clocks is unspecified.

       A clock_id of CLOCK_HIGHRES represents the non-adjustable, high-resolu‐
       tion  clock  for	 the  system.  For  this  clock, the value returned by
       clock_gettime(3C)  represents  the  amount  of  time  (in  seconds  and
       nanoseconds)  since  some  arbitrary time in the past; it is not corre‐
       lated in any way to the time of day, and thus is not subject to	reset‐
       ting  or	 drifting  by  way  of	adjtime(2), ntp_adjtime(2), settimeof‐
       day(3C), or clock_settime().  The time source for  this	clock  is  the
       same as that for gethrtime(3C).

       Additional  clocks  may	also  be supported. The interpretation of time
       values for these clocks is unspecified.

       Upon successful completion, 0  is returned. Otherwise, −1  is  returned
       and errno is set to indicate the error.

       The  clock_settime(), clock_gettime() and clock_getres() functions will
       fail if:

		 The clock_id argument does not specify a known clock.

		 The   functions   clock_settime(),    clock_gettime(),	   and
		 clock_getres() are not supported by this implementation.

       The clock_settime() function will fail if:

		 The  tp  argument to clock_settime() is outside the range for
		 the given clock ID; or the tp argument specified a nanosecond
		 value	less  than  zero or greater than or equal to 1000 mil‐

       The clock_settime() function may fail if:

		The requesting process does not have the appropriate privilege
		to set the specified clock.

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

       │Interface Stability │ Committed				   │
       │MT-Level	    │ clock_gettime() is Async-Signal-Safe │
       │Standard	    │ See standards(5).			   │

       time(2),	 ctime(3C),  gethrtime(3C),  time.h(3HEAD), timer_gettime(3C),
       attributes(5), standards(5)

				  Feb 5, 2008		     CLOCK_SETTIME(3C)

List of man pages available for SmartOS

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net