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From: mookid@sigent.ru (Mikhail Zabaluev)
To: devel@linux.iplabs.ru
Subject: [devel] 64-bit fcntl()
Date: Wed, 6 Dec 2000 21:26:54 +0300
Message-ID: <20001206212654.A19896@localhost.localdomain> (raw)

[-- Attachment #1: Type: text/plain, Size: 571 bytes --]

Доброе время суток.

"Крупнофайловый" fcntl() с ядром 2.2.17-ipl3mdk и glibc-2.2-ipl1mdk
все-таки ведет себя странно: на F_SETLKW по файлу, залоченному другим
процессом, выдает EAGAIN, как при неблокирующем вызове. Для проверки
прилагаю программку, которую нужно запустить в одном рабочем каталоге
в двух экземплярах (один в background, другой в foreground). При
нормальной работе fcntl() foreground'ный процесс должен зависнуть.
Помогите, люди добрые, ведь Апач с Perl 5.6.0 не работает!

-- 
Stay tuned,
  MhZ                                    mailto:mookid@sigent.ru

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#define _FILE_OFFSET_BITS 64

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>


static struct flock lock = {
        F_WRLCK,
        SEEK_CUR,
        0L,
        0L
    };

int main ()
{
    static int fd;

    fd = open("dummy.lock", O_RDWR | O_CREAT, 0644);
    if (fd < 0) {
        perror("cannot open lockfile");
        return 1;
    }

    if (fcntl(fd, F_SETLKW, &lock) == -1) {
        perror("cannot obtain exclusive lock");
        return 2;
    }

    pause();

    close(fd);
    return 0;
}

             reply	other threads:[~2000-12-06 18:26 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2000-12-06 18:26 Mikhail Zabaluev [this message]
2000-12-20 20:18 ` Dmitry V. Levin

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