File: alarm.2

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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
.\"                               1993 Michael Haardt, Ian Jackson.
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\" 
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\" 
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Modified Wed Jul 21 19:42:57 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Sun Jul 21 21:25:26 1996 by Andries Brouwer <aeb@cwi.nl>
.\" Modified Wed Nov  6 03:46:05 1996 by Eric S. Raymond <esr@thyrsus.com>
.\"
.TH ALARM 2 "21 Julho 1993" Linux "Manual do Programador Linux"
.SH NOME
alarm \- define um alarme de relgio para envio de um sinal
.SH SINOPSE
.nf
.B #include <unistd.h>
.sp
.BI "unsigned int alarm(unsigned int " segundos );
.fi
.SH DESCRIO
.BR alarm " configura o envio de um sinal " SIGALRM
para o processo em
.I segundos.

Se
.I segundos 
 igual a zero, nenhum novo
.B alarm
 agendado.

Em qualquer evento qualquer definio prvia de
.B alarm
 cancelada.
.SH "VALOR DE RETORNO"
.B alarm
retorna o nmero de segundos restantes at que outro alarme
agendado previamente seja convenientemente enviado ou zero
se no houver nenhum alarme agendado previamente.
.SH NOTAS
.BR alarm " e " setitimer
compartilham o mesmo temporizador; chamadas para um deles ir interferir
no uso do outro.
.PP
.B sleep()
pode ser implementado usando
.BR SIGALRM ;
mixar as chamadas para
.B alarm()
e
.B sleep()
 uma m idia.

Atrasos do agendamento podem, s vezes, fazer com que a execuo do processo
seja retardada por uma quantidade de tempo arbitrria.
.SH "DE ACORDO COM"
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
.SH "VEJA TAMBM"
.BR setitimer (2),
.BR signal (2),
.BR sigaction (2),
.BR gettimeofday (2),
.BR select (2),
.BR pause (2),
.BR sleep (3)
.SH TRADUZIDO POR LDP-BR em 21/08/2000.
\&\fR\&\f(CWMarcelo D. Beckmann <marcelobeckmann@yahoo.com> (traduo)\fR
\&\fR\&\f(CWFbio Henrique F. Silva <fabiohfs@mail.com> (reviso)\fR