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-.\" Copyright (c) 1983, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
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-.\"    must display the following acknowledgement:
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-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
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-.\"
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-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.\"
-.\"     @(#)getitimer.2	8.3 (Berkeley) 5/16/95
-.\"
-.Dd May 16, 1995
-.Dt GETITIMER 2
-.Os BSD 4.2
-.Sh NAME
-.Nm getitimer ,
-.Nm setitimer
-.Nd get/set value of interval timer
-.Sh SYNOPSIS
-.Fd #include <sys/time.h>
-.Fd #define ITIMER_REAL		0
-.Fd #define ITIMER_VIRTUAL	1
-.Fd #define ITIMER_PROF		2
-.Ft int
-.Fn getitimer "int which" "struct itimerval *value"
-.Ft int
-.Fn setitimer "int which" "const struct itimerval *value" "struct itimerval *ovalue"
-.Sh DESCRIPTION
-The system provides each process with three interval timers,
-defined in
-.Ao Pa sys/time.h Ac .
-The
-.Fn getitimer
-call returns the current value for the timer specified in
-.Fa which
-in the structure at
-.Fa value .
-The
-.Fn setitimer
-call sets a timer to the specified
-.Fa value
-(returning the previous value of the timer if
-.Fa ovalue
-is non-nil).
-.Pp
-A timer value is defined by the 
-.Fa itimerval
-structure:
-.Bd -literal -offset indent
-struct itimerval {
-	struct	timeval it_interval;	/* timer interval */
-	struct	timeval it_value;	/* current value */
-};
-.Ed
-.Pp
-If
-.Fa it_value
-is non-zero, it indicates the time to the next timer expiration. 
-If
-.Fa it_interval
-is non-zero, it specifies a value to be used in reloading 
-.Fa it_value
-when the timer expires.
-Setting 
-.Fa it_value
-to 0 disables a timer, regardless of the value of
-.Fa it_interval .
-Setting
-.Fa it_interval
-to 0 causes a timer to be disabled after its next expiration (assuming
-.Fa it_value
-is non-zero).
-.Pp
-Time values smaller than the resolution of the
-system clock are rounded up to this resolution
-(typically 10 milliseconds).
-.Pp
-The
-.Dv ITIMER_REAL
-timer decrements in real time.  A
-.Dv SIGALRM
-signal is
-delivered when this timer expires.
-.Pp
-The
-.Dv ITIMER_VIRTUAL
-timer decrements in process virtual time.
-It runs only when the process is executing.  A
-.Dv SIGVTALRM
-signal
-is delivered when it expires.
-.Pp
-The
-.Dv ITIMER_PROF
-timer decrements both in process virtual time and
-when the system is running on behalf of the process.  It is designed
-to be used by interpreters in statistically profiling the execution
-of interpreted programs.
-Each time the
-.Dv ITIMER_PROF
-timer expires, the
-.Dv SIGPROF
-signal is
-delivered.  Because this signal may interrupt in-progress
-system calls, programs using this timer must be prepared to
-restart interrupted system calls.
-.Pp
-The maximum number of seconds allowed for
-.Fa it_interval
-and
-.Fa it_value
-in
-.Fn setitimer
-is 100000000.
-.Sh NOTES
-Three macros for manipulating time values are defined in
-.Ao Pa sys/time.h Ac .
-.Fa Timerclear
-sets a time value to zero,
-.Fa timerisset
-tests if a time value is non-zero, and
-.Fa timercmp
-compares two time values.
-.Sh RETURN VALUES
-If the calls succeed, a value of 0 is returned.  If an error occurs,
-the value -1 is returned, and a more precise error code is placed
-in the global variable
-.Va errno .
-.Sh ERRORS
-.Fn Getitimer
-and
-.Fn setitimer
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-The
-.Fa value
-parameter specified a bad address.
-.It Bq Er EINVAL
-A
-.Fa value
-parameter specified a time that was too large
-to be handled.
-.El
-.Sh SEE ALSO
-.Xr gettimeofday 2 ,
-.Xr select 2 ,
-.Xr sigvec 2 ,
-.Xr clocks 7
-.Sh HISTORY
-The
-.Fn getitimer
-function call appeared in
-.Bx 4.2 .