Udev incompatibility with qemu and bochs

["Alexander E. Patrakov" <patrakov@ums.usu.ru>]

Hello,

udevstart contains the following code:

static void asmlinkage sig_handler(int signum)
{
        switch (signum) {
                case SIGALRM:
                        exit(1);
                case SIGINT:
                case SIGTERM:
                        exit(20 + signum);
        }
}

int main(int argc, char *argv[], char *envp[])
{
/* snip */
        sigaction(SIGALRM, &act, NULL);
        sigaction(SIGINT, &act, NULL);
        sigaction(SIGTERM, &act, NULL);

        /* trigger timeout to prevent hanging processes */
        alarm(UDEV_ALARM_TIMEOUT);
/* snip */
}

UDEV_ALARM_TIMEOUT is defined to 120 seconds in udev.h. The problem is 
that it does take 2 minutes to populate /dev inside slow emulators like 
qemu or bochs, especially when the emulated and host CPU types differ 
and udev rules include RUN+=/sbin/udev_run_hotplugd. The reason is that 
inside those emulators exec() is very expensive (involves 
jit-compilation from one sort of machine code to another). Please 
provide an option to disable this alarm. The preferred form would be an 
environment variable, so that I can type "linux UDEV_NO_ALARM=1" at the 
boot prompt inside the emulator and see the system booting normally.

Thanks,
-- 
Alexander E. Patrakov


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