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Code Issues Releases Wiki Activity

The SIGABRT handler can no longer invoke abort() recursively.

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This commit is contained in:
obarthel
2023-09-10 11:45:38 +02:00
parent 64ab8643b5
commit 9a9ae7d6fd
2 changed files with 33 additions and 25 deletions
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15
library/signal_raise.c
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@@ -88,14 +88,15 @@ raise(int sig)
/* Which handler is installed for this signal? */
handler = __signal_handler_table[sig - SIGABRT];
/* Should we ignore this signal? */
/* Should we handle this signal rather than ignoring it? */
if (handler != SIG_IGN)
{
/* Block delivery of this signal to prevent recursion. */
SET_FLAG(local_signals_blocked, (1 << sig));
/* The default behaviour is to drop into abort(), or do
something very much like it. */
* something very much like it.
*/
if (handler == SIG_DFL)
{
SHOWMSG("this is the default handler");
@@ -114,14 +115,14 @@ raise(int sig)
SHOWMSG("bye, bye...");
}
/* Drop straight into abort(), which might call signal()
again but is otherwise guaranteed to eventually
land us in _exit(). */
abort();
/* Drop straight into __abort(), which will
eventually land us in _exit(). Note that
abort() calls raise(SIGABRT). */
__abort();
}
else
{
SHOWMSG("calling the handler");
SHOWMSG("calling the signal handler");
(*handler)(sig);

23
library/stdlib_abort.c
View File

@@ -46,15 +46,8 @@
/****************************************************************************/
void
abort(void)
__abort(void)
{
/* Try to call the signal handler that might be in charge of
handling cleanup operations, etc. */
raise(SIGABRT);
/* If the signal handler returns it means that we still have
to terminate the program. */
__check_abort_enabled = FALSE;
__print_termination_message(NULL);
@@ -63,3 +56,17 @@ abort(void)
does not trigger the exit trap. */
_exit(EXIT_FAILURE);
}
/****************************************************************************/
void
abort(void)
{
/* Try to call the signal handler that might be in charge of
handling cleanup operations, etc. */
raise(SIGABRT);
/* If the signal handler returns it means that we still have
to terminate the program. */
__abort();
}