clock_settime man page on HP-UX

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clocks(2)							     clocks(2)

       clock_settime(), clock_gettime(), clock_getres() - clock operations

       The  function  sets the specified clock, to the value specified by 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 function returns the current value for the specified clock,

       The resolution of any clock can be obtained by  calling	Clock  resolu‐
       tions are implementation defined and are not settable by a process.  If
       the argument is not NULL, the resolution	 of  the  specified  clock  is
       stored into the location pointed to by If is NULL, the clock resolution
       is not returned.

       A clock may be system wide, that is, visible to all processes; or  per-
       process, measuring time that is meaningful only within a process.

       The following clocks are supported:

	      This clock represents the realtime clock for the system.
			  For this clock, the values returned by and specified
			  by represent the amount  of  time  (in  seconds  and
			  nanoseconds)	since  the Epoch.  It is a system wide
			  clock.  The privilege is required to set this clock.
			  Processes  owned  by	the superuser have this privi‐
			  lege.	 Processes owned by other users may have  this
			  privilege,  depending	 on system configuration.  See
			  privileges(5) for more information about  privileged
			  access  on  systems that support fine-grained privi‐

	      This clock  represents  the  amount  of  time  (in  seconds  and
			  that the calling process has spent executing code in
			  the user's context.  It is a per-process clock.   It
			  cannot be set by the user.

	      This  clock  represents  the  amount  of	time  (in  seconds and
			  that the calling process has spent executing code in
			  both	the user's context and in the operating system
			  on behalf of the calling  process.   It  is  a  per-
			  process clock.  It cannot be set by the user.

	      These clocks are high resolution hardware clocks
			  present  on  HP-RT realtime systems.	It is included
			  here so that applications  accessing	this  hardware
			  can  be compiled on HP-UX systems and then ported to
			  an HP-RT target.  HP-UX does not support or

       A return of zero indicates that the call succeeded.  A return value  of
       −1 indicates that an error occurred, and is set to indicate the error.

       If  any	of the following conditions occur, the and functions return −1
       and set (see errno(2)) to the corresponding value:

	      The functions
			  and are not supported by this implementation.

	      The	  argument does not specify a known clock.

	      The	  argument to is outside the range for the given

	      The	  argument specified a nanosecond value less than zero
			  or greater than or equal to 1000 million.

	      The requesting process does not have the necessary privileges to
	      set the
			  specified clock.

	      The	  or argument points to an invalid address.

       Advance the system wide realtime clock approximately one hour:

       Get the resolution of the user profiling clock:

       and were derived from the proposed IEEE POSIX P1003.4  Standard,	 Draft

       timers(2), privileges(5).


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