2.11BSD/man/cat3/ualarm.0

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UALARM(3)	    UNIX Programmer's Manual		UALARM(3)



NAME
     ualarm - schedule signal after specified time

SYNOPSIS
     unsigned ualarm(value, interval)
     unsigned value;
     unsigned interval;

DESCRIPTION
     This is a simplified interface to setitimer(2).

     _U_a_l_a_r_m causes signal SIGALRM, see _s_i_g_n_a_l(3C), to be sent to
     the invoking process in a number of microseconds given by
     the _v_a_l_u_e argument.  Unless caught or ignored, the signal
     terminates the process.

     If the _i_n_t_e_r_v_a_l argument is non-zero, the SIGALRM signal
     will be sent to the process every _i_n_t_e_r_v_a_l microseconds
     after the timer expires (e.g. after _v_a_l_u_e microseconds have
     passed).

     Because of scheduling delays, resumption of execution of
     when the signal is caught may be delayed an arbitrary
     amount.  The longest specifiable delay time (on the vax) is
     2147483647 microseconds.

     The return value is the amount of time previously remaining
     in the alarm clock.

SEE ALSO
     getitimer(2), setitimer(2), sigpause(2), sigvec(2),
     signal(3C), sleep(3), alarm(3), usleep(3)

NOTES  (PDP-11)
     On the PDP-11, _s_e_t_i_t_i_m_e_r(2) rounds the number of
     microseconds up to seconds resolution, therefore _u_a_l_a_r_m
     doesn't give you any more resolution than _a_l_a_r_m(3).


















Printed 11/26/99	 August 26, 1988			1