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Re: Bug in ulimit ?

On Tue, Apr 17, 2007 at 02:03:16PM +0100, Stephane Chazelas wrote:
> So it would seem that the limit is inherited but not applied in
> the child (and I couldn't see any signal being blocked or
> ignored). So that's probably not a libc issue, rather a Linux
> issue.

The Linux code for setrlimit gives a hint:

        if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) {
                unsigned long rlim_cur = new_rlim.rlim_cur;
                cputime_t cputime;

                if (rlim_cur == 0) {
                         * The caller is asking for an immediate RLIMIT_CPU
                         * expiry.  But we use the zero value to mean "it was
                         * never set".  So let's cheat and make it one second
                         * instead
                        rlim_cur = 1;

It's stored as being "0" and armed with a 1 second delay. And on a fork,
obviously, for the new process, there's no way to distinguish
between a 0 that means "not set" and a 0 that means exit

And one can verify that it_prof_expires will be set to 0 in
copy_signal during the fork and that 0 means not armed in

But what's the point of setting a cputime of 0 anyway?


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