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Rotate on time boundaries that are sensible per local time rather than GMT.

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Also, avoid truncating the file we just wrote into, which might otherwise
easily happen at DST boundaries.  Ed L. and Tom Lane.
This commit is contained in:
Tom Lane 2004-09-21 00:21:25 +00:00
parent 6da0c439ee
commit 95f20b96d4
1 changed files with 27 additions and 5 deletions
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32
src/backend/postmaster/syslogger.c
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@ -18,7 +18,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.8 2004/08/31 04:53:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.9 2004/09/21 00:21:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -81,6 +81,8 @@ static bool pipe_eof_seen = false;
static FILE *syslogFile = NULL;
static char *last_file_name = NULL;
/* These must be exported for EXEC_BACKEND case ... annoying */
#ifndef WIN32
int syslogPipe[2] = {-1, -1};
@ -761,7 +763,20 @@ logfile_rotate(bool time_based_rotation)
else
filename = logfile_getname(time(NULL));
if (Log_truncate_on_rotation && time_based_rotation)
/*
* Decide whether to overwrite or append. We can overwrite if (a)
* Log_truncate_on_rotation is set, (b) the rotation was triggered by
* elapsed time and not something else, and (c) the computed file name
* is different from what we were previously logging into.
*
* Note: during the first rotation after forking off from the postmaster,
* last_file_name will be NULL. (We don't bother to set it in the
* postmaster because it ain't gonna work in the EXEC_BACKEND case.)
* So we will always append in that situation, even though truncating
* would usually be safe.
*/
if (Log_truncate_on_rotation && time_based_rotation &&
last_file_name != NULL && strcmp(filename, last_file_name) != 0)
fh = fopen(filename, "w");
else
fh = fopen(filename, "a");
@ -806,7 +821,10 @@ logfile_rotate(bool time_based_rotation)
set_next_rotation_time();
pfree(filename);
/* instead of pfree'ing filename, remember it for next time */
if (last_file_name != NULL)
pfree(last_file_name);
last_file_name = filename;
}
@ -854,6 +872,7 @@ static void
set_next_rotation_time(void)
{
pg_time_t now;
struct pg_tm *tm;
int rotinterval;
/* nothing to do if time-based rotation is disabled */
@ -863,13 +882,16 @@ set_next_rotation_time(void)
/*
* The requirements here are to choose the next time > now that is a
* "multiple" of the log rotation interval. "Multiple" can be interpreted
* fairly loosely --- in particular, for intervals larger than an hour,
* it might be interesting to align to local time instead of GMT.
* fairly loosely. In this version we align to local time rather than
* GMT.
*/
rotinterval = Log_RotationAge * 60; /* convert to seconds */
now = time(NULL);
tm = pg_localtime(&now);
now += tm->tm_gmtoff;
now -= now % rotinterval;
now += rotinterval;
now -= tm->tm_gmtoff;
next_rotation_time = now;
}