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/****************************************************************
* *
* Copyright 2001, 2013 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
/* Define handling of ALL signals. Most are now ignored but nothing should interrupt us
* without our knowledge and a handler defined.
*/
#include "mdef.h"
#include "gtm_string.h"
#include <signal.h>
#include "continue_handler.h"
#include "sig_init.h"
#include "gtmci_signals.h"
#ifdef GTM_PTHREAD
GBLREF boolean_t gtm_jvm_process;
#endif
void null_handler(int sig);
void sig_init(void (*signal_handler)(), void (*ctrlc_handler)(), void (*suspsig_handler)(), void (*continue_handler)())
{
struct sigaction ignore, null_action, def_action, susp_action,
gen_action, ctrlc_action, cont_action;
int sig;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
memset(&ignore, 0, SIZEOF(ignore));
sigemptyset(&ignore.sa_mask);
/* Copying only up to susp_action here to later specify SA_SIGINFO flag and continue copying with it. */
null_action = def_action = susp_action = ignore;
ignore.sa_handler = SIG_IGN;
null_action.sa_handler = null_handler;
def_action.sa_handler = SIG_DFL;
/* Give us extra info on the following signals and a full core if necessary. */
susp_action.sa_flags = SA_SIGINFO;
gen_action = ctrlc_action = cont_action = susp_action;
susp_action.sa_sigaction = suspsig_handler;
gen_action.sa_sigaction = signal_handler;
ctrlc_action.sa_sigaction = ctrlc_handler;
cont_action.sa_sigaction = continue_handler;
for (sig = 1; sig <= NSIG; sig++)
{
switch (sig)
{
case SIGHUP:
/* Tandem hack: rather than ignore SIGHUP, we must catch it and do nothing with the signal. This
* prevents ioctls on modem/tty devices from hanging when carrier drops during the system call.
*/
sigaction(sig, &null_action, NULL);
break;
case SIGCLD:
/* Default handling necessary for SIGCLD signal. CAUTION: consider the affect on JOB (timeout)
* implementation before changing this behavior (like defuncts, ECHILD errors, etc.).
*/
sigaction(sig, &def_action, NULL);
break;
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
/* These are all signals that suspend a process. */
if (NULL != suspsig_handler)
sigaction(sig, &susp_action, NULL);
else
sigaction(sig, &ignore, NULL);
break;
case SIGINT:
/* If supplied with a control-C handler, install it now. */
if (NULL != ctrlc_handler)
sigaction(sig, &ctrlc_action, NULL);
else
sigaction(sig, &ignore, NULL);
break;
case SIGCONT:
/* Special handling for SIGCONT. */
if (NULL != continue_handler)
{
# ifndef DISABLE_SIGCONT_PROCESSING
if (FALSE == TREF(disable_sigcont))
sigaction(SIGCONT, &cont_action, NULL);
# else
TREF(disable_sigcont) = TRUE;
# endif
} else
{
sigaction(sig, &ignore, NULL);
TREF(disable_sigcont) = TRUE;
}
break;
case SIGSEGV:
# ifdef GTM_PTHREAD
if (gtm_jvm_process)
break;
# endif
case SIGABRT:
# ifdef GTM_PTHREAD
if (gtm_jvm_process)
break;
# endif
case SIGBUS:
# ifdef _AIX
case SIGDANGER:
# endif
case SIGFPE:
# ifdef __MVS__
case SIGABND:
# else
/* On Linux SIGIOT is commonly same as SIGABRT, so to avoid duplicate cases, check for that. */
# if !defined(__CYGWIN__) && defined (SIGIOT) && (SIGIOT != SIGABRT)
case SIGIOT:
# endif
# ifndef __linux__
case SIGEMT:
# endif
# endif
case SIGILL:
case SIGQUIT:
# ifndef __linux__
case SIGSYS:
# endif
case SIGTERM:
case SIGTRAP:
/* These are all being handled by the generic_signal_handler. */
sigaction(sig, &gen_action, NULL);
break;
default:
sigaction(sig, &ignore, NULL);
}
}
}
/* Provide null signal handler */
void null_handler(int sig)
{
/* */
}
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