установить будильник для подачи сигнала (set an alarm clock for delivery of a signal)
Имя (Name)
alarm - set an alarm clock for delivery of a signal
Синопсис (Synopsis)
#include <unistd.h>
unsigned int alarm(unsigned int seconds);
Описание (Description)
alarm() arranges for a SIGALRM signal to be delivered to the
calling process in seconds seconds.
If seconds is zero, any pending alarm is canceled.
In any event any previously set alarm() is canceled.
Возвращаемое значение (Return value)
alarm() returns the number of seconds remaining until any
previously scheduled alarm was due to be delivered, or zero if
there was no previously scheduled alarm.
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
Примечание (Note)
alarm() and setitimer(2) share the same timer; calls to one will
interfere with use of the other.
Alarms created by alarm() are preserved across execve(2) and are
not inherited by children created via fork(2).
sleep(3) may be implemented using SIGALRM; mixing calls to
alarm() and sleep(3) is a bad idea.
Scheduling delays can, as ever, cause the execution of the
process to be delayed by an arbitrary amount of time.
Смотри также (See also)
gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2),
signal(2), timer_create(2), timerfd_create(2), sleep(3), time(7)
