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Fix Y2038 issues with MyStartTime.

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Several places treat MyStartTime as a "long", which is only 32 bits
wide on some platforms.  In reality, MyStartTime is a pg_time_t,
i.e., a signed 64-bit integer.  This will lead to interesting bugs
on the aforementioned systems in 2038 when signed 32-bit integers
are no longer sufficient to store Unix time (e.g., "pg_ctl start"
hanging).  To fix, ensure that MyStartTime is handled as a 64-bit
value everywhere.  (Of course, users will need to ensure that
time_t is 64 bits wide on their system, too.)

Co-authored-by: Max Johnson
Discussion: https://postgr.es/m/CO1PR07MB905262E8AC270FAAACED66008D682%40CO1PR07MB9052.namprd07.prod.outlook.com
Backpatch-through: 12
This commit is contained in:
Nathan Bossart 2024-10-07 13:51:03 -05:00
parent efe706e273
commit 5cea7168df
3 changed files with 7 additions and 7 deletions
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8
src/backend/utils/error/elog.c
View File

@ -2538,12 +2538,12 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
{
char strfbuf[128];
snprintf(strfbuf, sizeof(strfbuf) - 1, "%lx.%x",
(long) (MyStartTime), MyProcPid);
snprintf(strfbuf, sizeof(strfbuf) - 1, "%" INT64_MODIFIER "x.%x",
MyStartTime, MyProcPid);
appendStringInfo(buf, "%*s", padding, strfbuf);
}
else
appendStringInfo(buf, "%lx.%x", (long) (MyStartTime), MyProcPid);
appendStringInfo(buf, "%" INT64_MODIFIER "x.%x", MyStartTime, MyProcPid);
break;
case 'p':
if (padding != 0)
@ -2848,7 +2848,7 @@ write_csvlog(ErrorData *edata)
appendStringInfoChar(&buf, ',');
/* session id */
appendStringInfo(&buf, "%lx.%x", (long) MyStartTime, MyProcPid);
appendStringInfo(&buf, "%" INT64_MODIFIER "x.%x", MyStartTime, MyProcPid);
appendStringInfoChar(&buf, ',');
/* Line number */

4
src/backend/utils/init/miscinit.c
View File

@ -1205,10 +1205,10 @@ CreateLockFile(const char *filename, bool amPostmaster,
* both datadir and socket lockfiles; although more stuff may get added to
* the datadir lockfile later.
*/
snprintf(buffer, sizeof(buffer), "%d\n%s\n%ld\n%d\n%s\n",
snprintf(buffer, sizeof(buffer), "%d\n%s\n" INT64_FORMAT "\n%d\n%s\n",
amPostmaster ? (int) my_pid : -((int) my_pid),
DataDir,
(long) MyStartTime,
MyStartTime,
PostPortNumber,
socketDir);

2
src/bin/pg_ctl/pg_ctl.c
View File

@ -624,7 +624,7 @@ wait_for_postmaster_start(pgpid_t pm_pid, bool do_checkpoint)
* Allow 2 seconds slop for possible cross-process clock skew.
*/
pmpid = atol(optlines[LOCK_FILE_LINE_PID - 1]);
pmstart = atol(optlines[LOCK_FILE_LINE_START_TIME - 1]);
pmstart = atoll(optlines[LOCK_FILE_LINE_START_TIME - 1]);
if (pmstart >= start_time - 2 &&
#ifndef WIN32
pmpid == pm_pid