User-space interrupts
User-space interrupts
Posted Oct 1, 2021 13:46 UTC (Fri) by mathstuf (subscriber, #69389)In reply to: User-space interrupts by droundy
Parent article: User-space interrupts
The handler could twiddle with memory the syscall is working with from the userspace side, no? You'll need a context swap at least anyways so the handler has the right memory mappings.
Posted Oct 1, 2021 16:30 UTC (Fri)
by nybble41 (subscriber, #55106)
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User-space interrupts
Another thread in the same process can already change memory (and mappings) while the first thread is in a system call, either because a reschedule occurred during the system call or because the other thread is running on a different CPU. A signal handler doesn't seem like it would change anything in that regard.