65 lines
3.1 KiB
C
65 lines
3.1 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2010 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include <signal.h>
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#include "gtm_time.h"
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#include <sys/time.h>
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#include "dollarh.h"
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#include "gtmimagename.h"
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GBLREF boolean_t run_time;
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GBLREF boolean_t blocksig_initialized;
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GBLREF sigset_t block_sigsent;
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void dollarh(time_t intime, uint4 *days, time_t *seconds)
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{
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uint4 tdays;
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int isdst;
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struct tm *ttime;
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sigset_t savemask;
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#ifdef DEBUG
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static uint4 old_days = 0, old_seconds = 0;
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static time_t old_intime = 0;
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static int old_isdst;
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#endif
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/* When dollarh() is processing and a signal occurs, the signal processing can eventually lead to nested system time
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* routine calls. If a signal arrives during a system time call (__tzset() in linux) we end up in a generic signal
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* handler which invokes syslog which in turn tries to call the system time routine (__tz_convert() in linux) which
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* seems to get suspended presumably waiting for the same interlock that __tzset() has already obtained. A work around
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* is to block signals (SIGINT, SIGQUIT, SIGTERM, SIGTSTP, SIGCONT, SIGALRM) during the function and then restore them
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* at the end. [C9D06-002271] [C9I03-002967].
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*/
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assert(blocksig_initialized); /* the set of blocking signals should be initialized at process startup */
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if (blocksig_initialized) /* In pro, dont take chances and handle case where it is not initialized */
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sigprocmask(SIG_BLOCK, &block_sigsent, &savemask);
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ttime = localtime(&intime); /* represent intime as local time in case of offsets from UCT other than hourly */
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*seconds = (time_t)(ttime->tm_hour * HOUR) + (ttime->tm_min * MINUTE) + ttime->tm_sec;
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isdst = ttime->tm_isdst;
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ttime = gmtime(&intime); /* represent intime as UCT */
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ttime->tm_isdst = isdst; /* use localtime() to tell mktime whether daylight savings needs to be applied */
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tdays = (uint4)((intime + (time_t)difftime(intime, mktime(ttime))) / ONEDAY) + DAYS; /* adjust relative to UTC */
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*days = tdays; /* use temp local in case the caller has overlapped arguments */
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if (blocksig_initialized)
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sigprocmask(SIG_SETMASK, &savemask, NULL);
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/* Assert that $H always moves forward. The only exception is a negative time adjustment due to DST change.
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* Do asserts AFTER unblocking signals as otherwise assert failures could hang and/or result in no cores.
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* DSE and MUPIP use this function to potentially display times in the past (e.g. in DSE DUMP -FILE,
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* MUPIP JOURNAL EXTRACT) so restrict this assert to the runtime for now.
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*/
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assert(!IS_GTM_IMAGE || ((*days == old_days) && (*seconds >= old_seconds)) || (*days > old_days)
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|| (0 < old_isdst) && (0 == isdst));
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DEBUG_ONLY(old_seconds = (uint4)*seconds; old_days = *days; old_intime = intime; old_isdst = isdst;)
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return;
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}
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