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[Ada] Add some comments in init.c about the lynx178 signal handler

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gcc/ada/

	* init.c (__gnat_error_handler) [LynxOS]: Add a comment about
	missing optional args.
This commit is contained in:
Doug Rupp 2021-07-07 09:38:34 -07:00 committed by Pierre-Marie de Rodat
parent e839168738
commit 303b5d8747
1 changed files with 22 additions and 0 deletions
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22
gcc/ada/init.c
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@ -661,6 +661,28 @@ __gnat_install_handler (void)
#include <signal.h>
#include <unistd.h>
/* SA_SIGINFO is not supported by default on LynxOS, so all we have
available here is the "sig" argument. On newer LynxOS versions it's
possible to support SA_SIGINFO by setting a kernel configuration macro.
To wit:
#define NONPOSIX_SA_HANDLER_PROTO (0)
This macro must be set to 1 in either sys/bsp.<bspname>/uparam.h
or in the associated uparam.h customization file sys/bsp.<bspname>/xparam.h
(uparam.h includes xparam.h for customization)
The NONPOSIX_SA_HANDLER_PROTO macro makes it possible to provide
signal-catching function with 'info' and 'context' input parameters
even if SA_SIGINFO flag is not set or it is set for a non-realtime signal.
It also allows signal-catching function to update thread context even
if SA_UPDATECTX flag is not set.
This would be useful, but relying on that would transmit the requirement
to users to configure that feature as well, which is undesirable. */
static void
__gnat_error_handler (int sig)
{