On Mon, Feb 29, 2016 at 1:29 PM, Stas Sergeev <s...@list.ru> wrote: > This patch implements the SS_AUTODISARM flag that can be ORed with > SS_ONSTACK when forming ss_flags. > When this flag is set, sigaltstack will be disabled when entering > the signal handler; more precisely, after saving sas to uc_stack. > When leaving the signal handler, the sigaltstack is restored by > uc_stack. > When this flag is used, it is safe to switch from sighandler with > swapcontext(). Without this flag, the subsequent signal will corrupt > the state of the switched-away sighandler. >
This looks reasonable to me with one exception: how does a user program detect the presence of this feature? Anyone else have any thoughts?
