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fis-gtm/sr_unix/generic_signal_handler.c

344 lines
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/****************************************************************
* *
* Copyright 2001, 2012 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. *
* *
****************************************************************/
/* Standard signal processor
*
* If we are nesting our handlers in an improper way, this routine will
* not return but will immediately invoke core/termination processing.
*
* Returns if some condition makes it inadvisable to exit now else invokes the system exit() system call.
* For GTMSECSHR it unconditionally returns to gtmsecshr_signal_handler() which later invokes gtmsecshr_exit().
*/
#include "mdef.h"
#include "gtm_string.h"
#include "gtm_unistd.h"
#include "gtm_stdlib.h" /* for exit() */
#include "gtm_inet.h"
#include <signal.h>
#include "gtm_stdio.h"
#include "error.h"
#include "gtmsiginfo.h"
#include "gtmimagename.h"
#include "gt_timer.h"
#include "send_msg.h"
#include "generic_signal_handler.h"
#include "gtmmsg.h"
#include "gtmio.h"
#include "have_crit.h"
#define DEFER_EXIT_PROCESSING ((EXIT_PENDING_TOLERANT >= exit_state) && \
(exit_handler_active || !OK_TO_INTERRUPT))
/* These fields are defined as globals not because they are used globally but
* so they will be easily retrievable even in 'pro' cores.
*/
GBLDEF siginfo_t exi_siginfo;
GBLDEF gtm_sigcontext_t exi_context;
GBLREF VSIG_ATOMIC_T forced_exit;
GBLREF int4 forced_exit_err;
GBLREF int4 exi_condition;
GBLREF boolean_t dont_want_core;
GBLREF boolean_t created_core;
GBLREF boolean_t need_core;
GBLREF uint4 process_id;
GBLREF volatile int4 exit_state;
GBLREF volatile unsigned int core_in_progress;
GBLREF gtmsiginfo_t signal_info;
GBLREF boolean_t exit_handler_active;
GBLREF void (*call_on_signal)();
GBLREF boolean_t gtm_quiet_halt;
GBLREF volatile int4 gtmMallocDepth; /* Recursion indicator */
LITREF gtmImageName gtmImageNames[];
error_def(ERR_FORCEDHALT);
error_def(ERR_GTMSECSHRSHUTDN);
error_def(ERR_KILLBYSIG);
error_def(ERR_KILLBYSIGSINFO1);
error_def(ERR_KILLBYSIGSINFO2);
error_def(ERR_KILLBYSIGSINFO3);
error_def(ERR_KILLBYSIGUINFO);
error_def(ERR_KRNLKILL);
void generic_signal_handler(int sig, siginfo_t *info, void *context)
{
boolean_t exit_now;
gtm_sigcontext_t *context_ptr;
void (*signal_routine)();
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
/* Save parameter value in global variables for easy access in core */
dont_want_core = FALSE; /* (re)set in case we recurse */
created_core = FALSE; /* we can deal with a second core if needbe */
exi_condition = sig;
if (NULL != info)
exi_siginfo = *info;
else
memset(&exi_siginfo, 0, SIZEOF(*info));
# if defined(__ia64) && defined(__hpux)
context_ptr = (gtm_sigcontext_t *)context; /* no way to make a copy of the context */
memset(&exi_context, 0, SIZEOF(exi_context));
# else
if (NULL != context)
exi_context = *(gtm_sigcontext_t *)context;
else
memset(&exi_context, 0, SIZEOF(exi_context));
context_ptr = &exi_context;
# endif
/* Check if we are fielding nested immediate shutdown signals */
if (EXIT_IMMED <= exit_state)
{
switch(sig)
{ /* If we are dealing with one of these three dangerous signals which we have
* already hit while attempting to shutdown once, die with core now.
*/
case SIGSEGV:
case SIGBUS:
case SIGILL:
if (core_in_progress)
{
if (exit_handler_active)
_exit(sig);
else
exit(sig);
}
++core_in_progress;
DUMP_CORE;
GTMASSERT;
default:
;
}
}
switch(sig)
{
case SIGTERM:
forced_exit_err = (IS_GTMSECSHR_IMAGE ? ERR_GTMSECSHRSHUTDN : ERR_FORCEDHALT);
/* If nothing pending AND we have crit or in wcs_wtstart() or already in exit processing, wait to
* invoke shutdown. wcs_wtstart() manipulates the active queue that a concurrent process in crit
* in bt_put() might be waiting for. interrupting it can cause deadlocks (see C9C11-002178).
*/
if (DEFER_EXIT_PROCESSING)
{
forced_exit = TRUE;
exit_state++; /* Make exit pending, may still be tolerant though */
assert(!IS_GTMSECSHR_IMAGE);
if (exit_handler_active && !gtm_quiet_halt)
{
send_msg(VARLSTCNT(1) forced_exit_err);
gtm_putmsg(VARLSTCNT(1) forced_exit_err);
}
return;
}
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE; /* set this BEFORE cancelling timers as wcs_phase2_commit_wait relies on this */
if (ERR_FORCEDHALT != forced_exit_err || !gtm_quiet_halt)
{
send_msg(VARLSTCNT(1) forced_exit_err);
gtm_putmsg(VARLSTCNT(1) forced_exit_err);
}
dont_want_core = TRUE;
break;
case SIGQUIT: /* Handle SIGQUIT specially which we ALWAYS want to defer if possible as it is always sent */
dont_want_core = TRUE;
extract_signal_info(sig, &exi_siginfo, context_ptr, &signal_info);
switch(signal_info.infotype)
{
case GTMSIGINFO_NONE:
forced_exit_err = ERR_KILLBYSIG;
break;
case GTMSIGINFO_USER:
forced_exit_err = ERR_KILLBYSIGUINFO;
break;
case GTMSIGINFO_ILOC + GTMSIGINFO_BADR:
forced_exit_err = ERR_KILLBYSIGSINFO1;
break;
case GTMSIGINFO_ILOC:
forced_exit_err = ERR_KILLBYSIGSINFO2;
break;
case GTMSIGINFO_BADR:
forced_exit_err = ERR_KILLBYSIGSINFO3;
break;
default:
exit_state = EXIT_IMMED;
GTMASSERT;
}
/* If nothing pending AND we have crit or already in exit processing, wait to invoke shutdown */
if (DEFER_EXIT_PROCESSING)
{
forced_exit = TRUE;
exit_state++; /* Make exit pending, may still be tolerant though */
assert(!IS_GTMSECSHR_IMAGE);
return;
}
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
switch(signal_info.infotype)
{
case GTMSIGINFO_NONE:
send_msg(VARLSTCNT(6) ERR_KILLBYSIG, 4, GTMIMAGENAMETXT(image_type), process_id, sig);
gtm_putmsg(VARLSTCNT(6) ERR_KILLBYSIG, 4, GTMIMAGENAMETXT(image_type), process_id, sig);
break;
case GTMSIGINFO_USER:
send_msg(VARLSTCNT(8) ERR_KILLBYSIGUINFO, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.send_pid, signal_info.send_uid);
gtm_putmsg(VARLSTCNT(8) ERR_KILLBYSIGUINFO, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.send_pid, signal_info.send_uid);
break;
case GTMSIGINFO_ILOC + GTMSIGINFO_BADR:
send_msg(VARLSTCNT(8) ERR_KILLBYSIGSINFO1, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr, signal_info.bad_vadr);
gtm_putmsg(VARLSTCNT(8) ERR_KILLBYSIGSINFO1, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr, signal_info.bad_vadr);
break;
case GTMSIGINFO_ILOC:
send_msg(VARLSTCNT(7) ERR_KILLBYSIGSINFO2, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr);
gtm_putmsg(VARLSTCNT(7) ERR_KILLBYSIGSINFO2, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr);
break;
case GTMSIGINFO_BADR:
send_msg(VARLSTCNT(7) ERR_KILLBYSIGSINFO3, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.bad_vadr);
gtm_putmsg(VARLSTCNT(7) ERR_KILLBYSIGSINFO3, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.bad_vadr);
break;
}
break;
# ifdef _AIX
case SIGDANGER:
forced_exit_err = ERR_KRNLKILL;
/* If nothing pending AND we have crit or already in exit processing, wait to invoke shutdown */
if (DEFER_EXIT_PROCESSING)
{
forced_exit = TRUE;
exit_state++; /* Make exit pending, may still be tolerant though */
assert(!IS_GTMSECSHR_IMAGE);
return;
}
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(1) forced_exit_err);
gtm_putmsg(VARLSTCNT(1) forced_exit_err);
dont_want_core = TRUE;
break;
# endif
default:
extract_signal_info(sig, &exi_siginfo, context_ptr, &signal_info);
switch(signal_info.infotype)
{
case GTMSIGINFO_NONE:
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(6) ERR_KILLBYSIG, 4, GTMIMAGENAMETXT(image_type), process_id, sig);
gtm_putmsg(VARLSTCNT(6) ERR_KILLBYSIG, 4, GTMIMAGENAMETXT(image_type), process_id, sig);
break;
case GTMSIGINFO_USER:
/* This signal was SENT to us so it can wait until we are out of crit to cause an exit */
forced_exit_err = ERR_KILLBYSIGUINFO;
/* If nothing pending AND we have crit or already exiting, wait to invoke shutdown */
if (DEFER_EXIT_PROCESSING)
{
assert(!IS_GTMSECSHR_IMAGE);
forced_exit = TRUE;
exit_state++; /* Make exit pending, may still be tolerant though */
need_core = TRUE;
gtm_fork_n_core(); /* Generate "virgin" core while we can */
return;
}
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(8) ERR_KILLBYSIGUINFO, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.send_pid, signal_info.send_uid);
gtm_putmsg(VARLSTCNT(8) ERR_KILLBYSIGUINFO, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.send_pid, signal_info.send_uid);
break;
case GTMSIGINFO_ILOC + GTMSIGINFO_BADR:
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(8) ERR_KILLBYSIGSINFO1, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr, signal_info.bad_vadr);
gtm_putmsg(VARLSTCNT(8) ERR_KILLBYSIGSINFO1, 6, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr, signal_info.bad_vadr);
break;
case GTMSIGINFO_ILOC:
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(7) ERR_KILLBYSIGSINFO2, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr);
gtm_putmsg(VARLSTCNT(7) ERR_KILLBYSIGSINFO2, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.int_iadr);
break;
case GTMSIGINFO_BADR:
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
send_msg(VARLSTCNT(7) ERR_KILLBYSIGSINFO3, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.bad_vadr);
gtm_putmsg(VARLSTCNT(7) ERR_KILLBYSIGSINFO3, 5, GTMIMAGENAMETXT(image_type),
process_id, sig, signal_info.bad_vadr);
break;
default:
exit_state = EXIT_IMMED;
SET_PROCESS_EXITING_TRUE;
GTMASSERT;
}
if (0 != signal_info.sig_err)
{
send_msg(VARLSTCNT(1) signal_info.sig_err);
gtm_putmsg(VARLSTCNT(1) signal_info.sig_err);
}
break;
} /* switch (sig) */
cancel_timer(0); /* Don't want any interruptions */
FFLUSH(stdout);
if (!dont_want_core)
{
need_core = TRUE;
gtm_fork_n_core();
}
/* If any special routines are registered to be driven on a signal, drive them now */
if (0 != exi_condition)
{
/* If this is a GTM-ish process in runtime mode, call the routine to generate the zshow dump. This separate
* routine necessary because (1) generic_signal_handler() no longer calls condition handlers and (2) we couldn't
* use call_on_signal because it would already be in use in updproc() where it is also possible this routine
* needs to be called. Bypass this code if we didn't create a core since that means it is not a GTM
* issue that forced its demise (and since this is an uncaring interrupt, we could be in any number of
* situations that would cause a ZSHOW dump to explode). Better for user to use jobexam to cause a dump prior
* to terminating the process in a deferrable fashion.
*/
if (!dont_want_core && IS_MCODE_RUNNING && (NULL != (signal_routine = RFPTR(create_fatal_error_zshow_dmp_fptr))))
{ /* note assignment of signal_routine above */
SFPTR(create_fatal_error_zshow_dmp_fptr, NULL);
(*signal_routine)(exi_condition, FALSE);
}
/* Some mupip functions define an entry point to drive on signals. Make sure to do this AFTER we create the
* dump file above as it may detach things (like the recvpool) we need to create the above dump.
*/
if (NULL != (signal_routine = call_on_signal)) /* Note assignment */
{
call_on_signal = NULL; /* So we don't recursively call ourselves */
(*signal_routine)();
}
}
if (!IS_GTMSECSHR_IMAGE)
{
assert((EXIT_IMMED <= exit_state) || !exit_handler_active);
exit(-exi_condition);
} else
return;
}
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