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HP-UX 11i Version 3: February 2007

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reltimer — relatively arm a per-process timer


#include <sys/timers.h> int reltimer( timer_t timerid, struct itimerspec *value, struct itimerspec *ovalue );


The reltimer() function sets the it_value of the specified timer to an offset from the current clock setting.

If reltimer() specifies a value argument with the it_value member equal to zero, the timer is disabled. reltimer() updates the it_interval value of the timer to the value specified. Time values smaller than the resolution of the specified timer are rounded up to its resolution; timer values larger than the maximum value of the specified timer are rounded down to the maximum value (see mktimer(3C)).

reltimer() returns in the ovalue parameter a value representing the previous amount of time before the timer would have expired or zero if the timer was disabled, together with the previous interval timer period. The members of ovalue are subject to the resolution of the timer, and are the same values that would be returned by a gettimer() call.

The behavior of this function is undefined if value is NULL.


Upon successful completion, reltimer() returns zero; otherwise, it returns -1 and sets errno to indicate the error.


reltimer() fails if any of the following conditions are encountered:


timerid does not correspond to an ID returned by mktimer() or the value structure specified a nanosecond value less than zero or greater than or equal to 1000 million.


An error occurred while accessing the clock device.




reltimer(): AES

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