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/****************************************************************
* *
* Copyright (c) 2001-2018 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* 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. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_ipc.h"
#include "gtm_unistd.h"
#include "gtm_string.h"
#include "gtm_stdlib.h"
#include "gtm_fcntl.h"
#include "gtm_stdio.h"
#include "gtm_stat.h"
#include "gtm_signal.h" /* for kill(), SIGTERM, SIGQUIT */
#include <sys/mman.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/time.h>
#include <errno.h>
#include "gtm_sem.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsblk.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "gtm_c_stack_trace.h"
#include "eintr_wrapper_semop.h"
#include "eintr_wrappers.h"
#include "mu_rndwn_file.h"
#include "error.h"
#include "io.h"
#include "gt_timer.h"
#include "iosp.h"
#include "gtmio.h"
#include "gtmimagename.h"
#include "do_semop.h"
#include "ipcrmid.h"
#include "gtmmsg.h"
#include "util.h"
#include "semwt2long_handler.h"
#include "repl_sem.h"
#include "jnl.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "gtmrecv.h"
#include "gtm_semutils.h"
#include "ftok_sems.h"
#include "wbox_test_init.h"
GBLREF gd_region *ftok_sem_reg;
error_def(ERR_CRITSEMFAIL);
error_def(ERR_FTOKERR);
error_def(ERR_MAXSEMGETRETRY);
error_def(ERR_SEMWT2LONG);
#define MAX_SEM_DSE_WT (MILLISECS_IN_SEC * (30 / 2)) /* Actually 30 seconds before giving up - two semops with 15 second */
#define MAX_SEM_WT (MILLISECS_IN_SEC * (60 / 2)) /* Actually 60 seconds before giving up - two semops with 30 second */
/* If running in-house we want to debug live semop hangs. So, we will be continuing to hang until we get a successful semop with
* stack traces taken every MAX_SEM_DSE_WT/MAX_SEM_WT seconds.
*/
#define MAX_SEMOP_TRYCNT 2 /* effective wait time - 30 seconds for DSE and 1 minute for other images */
#define MAX_SEMOP_DBG_TRYCNT 604800 /* effective wait time - 3.5 days for DSE and 1 week for other images */
#define OLD_VERSION_SEM_PER_SET 2
#define ISSUE_CRITSEMFAIL_AND_RETURN(REG, FAILED_OP, ERRNO) \
{ \
gtm_putmsg_csa(CSA_ARG(REG2CSA(REG)) VARLSTCNT(4) ERR_CRITSEMFAIL, 2, DB_LEN_STR(REG)); \
gtm_putmsg_csa(CSA_ARG(REG2CSA(REG)) VARLSTCNT(8) ERR_SYSCALL, 5, RTS_ERROR_LITERAL(FAILED_OP), CALLFROM, ERRNO); \
return FALSE; \
}
#define CANCEL_TIMER_AND_RETURN_SUCCESS(REG) \
{ \
cancel_timer((TID)semwt2long_handler); \
RETURN_SUCCESS(REG); \
}
#define RETURN_SUCCESS(REG) \
{ \
ftok_sem_reg = REG; \
udi->grabbed_ftok_sem = TRUE; \
return TRUE; \
}
boolean_t ftok_sem_get_common(gd_region *reg, boolean_t incr_cnt, int project_id, boolean_t immediate, boolean_t *stacktrace_time,
boolean_t *timedout, semwait_status_t *retstat, boolean_t *bypass, boolean_t *ftok_counter_halted)
{
int status = SS_NORMAL, save_errno;
int ftok_sopcnt, sem_pid;
uint4 lcnt, loopcnt;
unix_db_info *udi;
union semun semarg;
sgmnt_addrs *csa;
node_local_ptr_t cnl;
boolean_t shared_mem_available, sem_known_removed;
int4 lcl_ftok_ops_index;
key_t ftokid;
struct sembuf ftok_sop[3];
char *msgstr;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
udi = FILE_INFO(reg);
assert(!udi->grabbed_ftok_sem && !udi->grabbed_access_sem);
assert(NULL == ftok_sem_reg);
if (-1 == (udi->key = FTOK(udi->fn, project_id)))
RETURN_SEMWAIT_FAILURE(retstat, errno, op_ftok, 0, ERR_FTOKERR, 0);
/* First try is always IPC_NOWAIT */
SET_GTM_SOP_ARRAY(ftok_sop, ftok_sopcnt, incr_cnt, (SEM_UNDO | IPC_NOWAIT));
/* The following loop deals with the possibility that the semaphores can be deleted by someone else AFTER a successful
* semget but BEFORE semop locks it, in which case we should retry.
*/
*ftok_counter_halted = FALSE;
sem_known_removed = FALSE;
for (lcnt = 0; MAX_SEMGET_RETRIES > lcnt; lcnt++)
{ /* Try to find an existing sem if we haven't already discovered that there isn't one. */
if (!sem_known_removed
&& (INVALID_SEMID == (ftokid = udi->ftok_semid = semget(udi->key, FTOK_SEM_PER_ID, RWDALL))))
{
save_errno = errno;
if (ENOENT == save_errno)
sem_known_removed = TRUE;
else
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semget, 0, ERR_CRITSEMFAIL, 0);
}
/* If we found there is no sem, create and initialize one. */
if (sem_known_removed)
{
if (INVALID_SEMID == (ftokid = udi->ftok_semid = semget(udi->key, FTOK_SEM_PER_ID, RWDALL | IPC_CREAT)))
{
save_errno = errno;
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semget, 0, ERR_CRITSEMFAIL, 0);
}
sem_known_removed = FALSE;
SET_GTM_ID_SEM(ftokid, status); /* Set 3rd semaphore's value to GTM_ID = 43 */
if (-1 == status)
{
save_errno = errno;
if (SEM_REMOVED(save_errno))
{ /* start afresh for next iteration of for loop with new semid and initial operations */
*ftok_counter_halted = FALSE;
SET_GTM_SOP_ARRAY(ftok_sop, ftok_sopcnt, incr_cnt, (SEM_UNDO | IPC_NOWAIT));
sem_known_removed = TRUE;
continue;
}
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semctl, 0, ERR_CRITSEMFAIL, 0);
}
}
/* First try is always non-blocking */
SEMOP(ftokid, ftok_sop, ftok_sopcnt, status, NO_WAIT);
if (-1 != status)
{
udi->counter_ftok_incremented = (FTOK_SOPCNT_NO_INCR_COUNTER != ftok_sopcnt);
/* Input parameter *bypass could be OK_TO_BYPASS_FALSE or OK_TO_BYPASS_TRUE (for "do_blocking_semop" call).
* But if we are returning without going that path, reset "*bypass" to reflect no bypass happened.
*/
*bypass = FALSE;
RETURN_SUCCESS(reg);
}
save_errno = errno;
assert(EINTR != save_errno);
if (ERANGE == save_errno)
{ /* We have no access to file header to check so just assume qdbrundown is set in the file header.
* If it turns out to be FALSE, after we read the file header, we will issue an error
*/
assert(!*ftok_counter_halted);
*ftok_counter_halted = TRUE;
ftok_sopcnt = FTOK_SOPCNT_NO_INCR_COUNTER; /* Ignore increment operation */
lcnt--; /* Do not count this attempt */
continue;
}
if (immediate)
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semop, 0, ERR_CRITSEMFAIL, 0);
if (EAGAIN == save_errno)
{ /* someone else is holding it */
if (NO_SEMWAIT_ON_EAGAIN == TREF(dbinit_max_delta_secs))
{
sem_pid = semctl(ftokid, DB_CONTROL_SEM, GETPID);
if (-1 != sem_pid)
RETURN_SEMWAIT_FAILURE(retstat, 0, op_invalid_sem_syscall, ERR_SEMWT2LONG, 0, sem_pid);
save_errno = errno; /* fall-through */
} else if (do_blocking_semop(ftokid, gtm_ftok_sem, stacktrace_time, timedout, retstat, reg, bypass,
ftok_counter_halted, incr_cnt))
{ /* ftok_counter_halted and bypass set by "do_blocking_semop" */
udi->counter_ftok_incremented = incr_cnt && !(*ftok_counter_halted);
if (*bypass)
return TRUE;
else
RETURN_SUCCESS(reg);
} else if (!SEM_REMOVED(retstat->save_errno))
return FALSE; /* retstat will already have the necessary error information */
save_errno = retstat->save_errno; /* some other error. Fall-through */
}
if (SEM_REMOVED(save_errno))
{ /* start afresh for next iteration of for loop with new semid and ftok_sopcnt */
*ftok_counter_halted = FALSE;
SET_GTM_SOP_ARRAY(ftok_sop, ftok_sopcnt, incr_cnt, (SEM_UNDO | IPC_NOWAIT));
sem_known_removed = TRUE;
continue;
}
assert(EINTR != save_errno);
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semctl_or_semop, 0, ERR_CRITSEMFAIL, 0);
}
assert(FALSE);
RETURN_SEMWAIT_FAILURE(retstat, 0, op_invalid_sem_syscall, 0, ERR_MAXSEMGETRETRY, 0);
}
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