>> A technique I used in a similar situation once went something like:
>> tv.tv_sec=bignum;
>> tv.tv_usec = 0;
>> enable_signals();
>> select(nfds, &readfds,&writefds,0,&tv);
>> and have the signal handlers set tv.tv_sec to 0. (tv is a global
>>variable).
>I've thought about that, but I haven't been able to find any guarantee that
>there will be no user space futzing around with &tv, like a library wrapper
>that copies tv to another spot in memory and invokes the syscall with that
>address.
This will commonly happen if, for example, the user-side timeval structure
contains seconds and microseconds and the kernel-side structure contains
seconds and nanoseconds. The signal might occur after the library has
performed the structure conversion.
DS
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This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:40 EST