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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 f391d9dc93
commit 5d6187d2a2
6 changed files with 10 additions and 10 deletions
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2
src/backend/utils/error/csvlog.c
View File

@@ -120,7 +120,7 @@ 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 */

6
src/backend/utils/error/elog.c
View File

@@ -2944,12 +2944,12 @@ log_status_format(StringInfo buf, const char *format, 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)

4
src/backend/utils/error/jsonlog.c
View File

@@ -168,8 +168,8 @@ write_jsonlog(ErrorData *edata)
}
/* Session id */
appendJSONKeyValueFmt(&buf, "session_id", true, "%lx.%x",
(long) MyStartTime, MyProcPid);
appendJSONKeyValueFmt(&buf, "session_id", true, "%" INT64_MODIFIER "x.%x",
MyStartTime, MyProcPid);
/* Line number */
appendJSONKeyValueFmt(&buf, "line_num", false, "%ld", log_line_number);