alarm(2) — Справочная страница Linux

alarm(2)                   System Calls Manual                  alarm(2)

ИМЯ

       alarm - set an alarm clock for delivery of a signal

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

ОПИСАНИЕ

       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.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       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

       POSIX.1-2008.

ИСТОРИЯ

       POSIX.1-2001, SVr4, 4.3BSD.

ПРИМЕЧАНИЯ

       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.

СМОТРИТЕ ТАКЖЕ

       gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2),
       signal(2), timer_create(2), timerfd_create(2), sleep(3), time(7)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
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       to-date source for the page, or you have corrections or
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       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                       alarm(2)

Страницы, которые ссылаются на эту страницу: tload(1), fork(2), getitimer(2), seccomp(2), signal(2), syscalls(2), sleep(3), ualarm(3), usleep(3), systemd.exec(5), signal(7), signal-safety(7), time(7)