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[MIRROR] Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking (#430)

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* Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking (#52761)

Adds SIGNAL_HANDLER, a macro that sets SHOULD_NOT_SLEEP(TRUE). This should ideally be required on all new signal callbacks.

Adds BLOCKING_SIGNAL_HANDLER, a macro that does nothing except symbolize "this is an older signal that didn't necessitate a code rewrite". It should not be allowed for new work.

This comes from discussion around #52735, which yields by calling input, and (though it sets the return type beforehand) will not properly return the flag to prevent attack from slapping.

To fix 60% of the yielding cases, WrapAdminProcCall no longer waits for another admin's proc call to finish. I'm not an admin, so I don't know how many behinds this has saved, but if this is problematic for admins I can just make it so that it lets you do it anyway. I'm not sure what the point of this babysitting was anyway.

Requested by @optimumtact.
Changelog

cl
admin: Calling a proc while another admin is calling one will no longer wait for the first to finish. You will simply just have to call it again.
/cl

* Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking

Co-authored-by: Jared-Fogle <35135081+Jared-Fogle@users.noreply.github.com>
This commit is contained in:
SkyratBot
2020-08-19 20:17:28 -04:00
committed by GitHub
co-authored by Jared-Fogle
parent d129e6973c
commit e65a48e91f
166 changed files with 906 additions and 20 deletions
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code/modules/admin/callproc/callproc.dm
+4 -10
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@@ -83,8 +83,6 @@ GLOBAL_VAR(LastAdminCalledTarget)
GLOBAL_PROTECT(LastAdminCalledTarget)
GLOBAL_VAR(LastAdminCalledProc)
GLOBAL_PROTECT(LastAdminCalledProc)
GLOBAL_LIST_EMPTY(AdminProcCallSpamPrevention)
GLOBAL_PROTECT(AdminProcCallSpamPrevention)
/// Wrapper for proccalls where the datum is flagged as vareditted
/proc/WrapAdminProcCall(datum/target, procname, list/arguments)
@@ -99,15 +97,11 @@ GLOBAL_PROTECT(AdminProcCallSpamPrevention)
var/ckey = usr ? usr.client.ckey : GLOB.AdminProcCaller
if(!ckey)
CRASH("WrapAdminProcCall with no ckey: [target] [procname] [english_list(arguments)]")
if(current_caller && current_caller != ckey)
if(!GLOB.AdminProcCallSpamPrevention[ckey])
to_chat(usr, "<span class='adminnotice'>Another set of admin called procs are still running, your proc will be run after theirs finish.</span>", confidential = TRUE)
GLOB.AdminProcCallSpamPrevention[ckey] = TRUE
UNTIL(!GLOB.AdminProcCaller)
to_chat(usr, "<span class='adminnotice'>Running your proc</span>", confidential = TRUE)
GLOB.AdminProcCallSpamPrevention -= ckey
else
UNTIL(!GLOB.AdminProcCaller)
to_chat(usr, "<span class='adminnotice'>Another set of admin called procs are still running. Try again later.</span>", confidential = TRUE)
return
GLOB.LastAdminCalledProc = procname
if(target != GLOBAL_PROC)
GLOB.LastAdminCalledTargetRef = REF(target)