<feep>       hi, I'm using a hack where I modify uc->uc_mcontext.gregs[REG_EIP] in a SIGSEGV signal handler in order to redirect execution to a handler function so I can do stuff that would not be signal handler safe to do
<feep>       just how unsupported is this behavior, on a scale between "we're not supposed to tell you but we use it ourselves" and "linus will murder you in your sleep"?
<czr>        feep, depends on how portable you need your code to be
<czr>        as far as I know, it's a supported although not very well documented feature.