Fix Y2038 issues with MyStartTime.

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

diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index d7f08e82ac12d925997b29757c4678a98ecb1920..11df04fd37df5b3004680ddd58c518f07a16b5e0 100644 (file)
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -2431,12 +2431,12 @@ 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)
@@ -2710,7 +2710,7 @@ 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 */

diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c
index 425498c1a7437c767c2542740c919a9a45c52429..6747f20fa6ca3e105eb3eaae81f6b4309cb611a9 100644 (file)
--- a/src/backend/utils/init/miscinit.c
+++ b/src/backend/utils/init/miscinit.c
@@ -1116,10 +1116,10 @@ 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);
 

diff --git a/src/bin/pg_ctl/pg_ctl.c b/src/bin/pg_ctl/pg_ctl.c
index 2437a65c03a35fc6484bdf4d52f75f5c27ebcda8..e77ae9d33c3d0e3a9c30d266346b8db91d9d899e 100644 (file)
--- a/src/bin/pg_ctl/pg_ctl.c
+++ b/src/bin/pg_ctl/pg_ctl.c
@@ -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