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Commit89067bc

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Fix syslogger to not fail when log_rotation_age exceeds 2^31 milliseconds.
We need to avoid calling WaitLatch with timeouts exceeding INT_MAX.Fortunately a simple clamp will do the trick, since no harm is done ifthe wait times out before it's really time to rotate the log file.Per bug #7670 (probably bug #7545 is the same thing, too).In passing, fix bogus definition of log_rotation_age's maximum value inguc.c --- it was numerically right, but only because MINS_PER_HOUR andSECS_PER_MINUTE have the same value.Back-patch to 9.2. Before that, syslogger wasn't using WaitLatch.
1 parentf0461cd commit89067bc

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2 files changed

+16
-3
lines changed

2 files changed

+16
-3
lines changed

‎src/backend/postmaster/syslogger.c‎

Lines changed: 15 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -24,6 +24,7 @@
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#include"postgres.h"
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#include<fcntl.h>
27+
#include<limits.h>
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#include<signal.h>
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#include<time.h>
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#include<unistd.h>
@@ -415,11 +416,23 @@ SysLoggerMain(int argc, char *argv[])
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* above is still close enough. Note we can't make this calculation
416417
* until after calling logfile_rotate(), since it will advance
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* next_rotation_time.
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*
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* Also note that we need to beware of overflow in calculation of the
421+
* timeout: with large settings of Log_RotationAge, next_rotation_time
422+
* could be more than INT_MAX msec in the future. In that case we'll
423+
* wait no more than INT_MAX msec, and try again.
418424
*/
419425
if (Log_RotationAge>0&& !rotation_disabled)
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{
421-
if (now<next_rotation_time)
422-
cur_timeout= (next_rotation_time-now)*1000L;/* msec */
427+
pg_time_tdelay;
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429+
delay=next_rotation_time-now;
430+
if (delay>0)
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{
432+
if (delay>INT_MAX /1000)
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delay=INT_MAX /1000;
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cur_timeout=delay*1000L;/* msec */
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}
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else
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cur_timeout=0;
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cur_flags=WL_TIMEOUT;

‎src/backend/utils/misc/guc.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2134,7 +2134,7 @@ static struct config_int ConfigureNamesInt[] =
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GUC_UNIT_MIN
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},
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&Log_RotationAge,
2137-
HOURS_PER_DAY*MINS_PER_HOUR,0,INT_MAX /MINS_PER_HOUR,
2137+
HOURS_PER_DAY*MINS_PER_HOUR,0,INT_MAX /SECS_PER_MINUTE,
21382138
NULL,NULL,NULL
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},
21402140

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