diff -ru postgresql-head/doc/src/sgml/func.sgml postgresql/doc/src/sgml/func.sgml
--- postgresql-head/doc/src/sgml/func.sgml 2012-04-03 10:44:43.979702643 +0200
+++ postgresql/doc/src/sgml/func.sgml 2012-04-03 11:21:15.075701574 +0200
@@ -14467,6 +14467,9 @@
pg_stop_backup
+ pg_backup_start_time
+
+
pg_switch_xlog
@@ -14532,6 +14535,13 @@
+ pg_backup_start_time()
+
+ timestamp with time zone
+ Get start time of an online exclusive backup in progress.
+
+
+
pg_switch_xlog()
text
diff -ru postgresql-head/src/backend/access/transam/xlogfuncs.c postgresql/src/backend/access/transam/xlogfuncs.c
--- postgresql-head/src/backend/access/transam/xlogfuncs.c 2012-04-03 10:44:44.227702645 +0200
+++ postgresql/src/backend/access/transam/xlogfuncs.c 2012-04-03 11:21:15.075701574 +0200
@@ -29,6 +29,7 @@
#include "utils/numeric.h"
#include "utils/guc.h"
#include "utils/timestamp.h"
+#include "storage/fd.h"
static void validate_xlog_location(char *str);
@@ -563,3 +564,67 @@
PG_RETURN_NUMERIC(result);
}
+
+/*
+ * Returns start time of an online exclusive backup.
+ *
+ * When there's no exclusive backup in progress, the function
+ * returns NULL.
+ */
+Datum
+pg_backup_start_time(PG_FUNCTION_ARGS)
+{
+ TimestampTz xtime;
+ FILE *lfp;
+ char fline[MAXPGPATH];
+ char backup_start_time[30];
+
+ /*
+ * See if label file is present
+ */
+ lfp = AllocateFile(BACKUP_LABEL_FILE, "r");
+ if (lfp == NULL)
+ {
+ if (errno != ENOENT)
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not read file \"%s\": %m",
+ BACKUP_LABEL_FILE)));
+ PG_RETURN_NULL();
+ }
+
+ /*
+ * Parse the file to find the the START TIME line.
+ */
+ backup_start_time[0] = '\0';
+ while (fgets(fline, sizeof(fline), lfp) != NULL)
+ {
+ if (sscanf(fline, "START TIME: %25[^\n]\n",
+ backup_start_time) == 1)
+ break;
+ }
+
+ /*
+ * Close the backup label file.
+ */
+ if (ferror(lfp) || FreeFile(lfp)) {
+ ereport(ERROR,
+ (errcode_for_file_access(),
+ errmsg("could not read file \"%s\": %m",
+ BACKUP_LABEL_FILE)));
+ }
+
+ if (strlen(backup_start_time) == 0) {
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("invalid data in file \"%s\"",
+ BACKUP_LABEL_FILE)));
+ }
+
+ /*
+ * Convert the time string read from file to TimestampTz form.
+ */
+ xtime = DatumGetTimestampTz(
+ DirectFunctionCall3(timestamptz_in,
+ CStringGetDatum(backup_start_time),
+ ObjectIdGetDatum(InvalidOid),Int32GetDatum(-1))
+ );
+
+ PG_RETURN_TIMESTAMPTZ(xtime);
+}
+
diff -ru postgresql-head/src/include/access/xlog_internal.h postgresql/src/include/access/xlog_internal.h
--- postgresql-head/src/include/access/xlog_internal.h 2012-04-03 10:44:45.051702642 +0200
+++ postgresql/src/include/access/xlog_internal.h 2012-04-03 11:21:15.075701574 +0200
@@ -282,5 +282,6 @@
extern Datum pg_xlog_replay_resume(PG_FUNCTION_ARGS);
extern Datum pg_is_xlog_replay_paused(PG_FUNCTION_ARGS);
extern Datum pg_xlog_location_diff(PG_FUNCTION_ARGS);
+extern Datum pg_backup_start_time(PG_FUNCTION_ARGS);
#endif /* XLOG_INTERNAL_H */
diff -ru postgresql-head/src/include/catalog/pg_proc.h postgresql/src/include/catalog/pg_proc.h
--- postgresql-head/src/include/catalog/pg_proc.h 2012-04-03 10:44:45.051702642 +0200
+++ postgresql/src/include/catalog/pg_proc.h 2012-04-03 11:21:15.075701574 +0200
@@ -2924,6 +2924,8 @@
DESCR("prepare for taking an online backup");
DATA(insert OID = 2173 ( pg_stop_backup PGNSP PGUID 12 1 0 0 0 f f f f t f v 0 0 25 "" _null_ _null_ _null_ _null_ pg_stop_backup _null_ _null_ _null_ ));
DESCR("finish taking an online backup");
+DATA(insert OID = 3883 ( pg_backup_start_time PGNSP PGUID 12 1 0 0 0 f f f f t f s 0 0 1184 "" _null_ _null_ _null_ _null_ pg_backup_start_time _null_ _null_ _null_ ));
+DESCR("start time of an online backup");
DATA(insert OID = 2848 ( pg_switch_xlog PGNSP PGUID 12 1 0 0 0 f f f f t f v 0 0 25 "" _null_ _null_ _null_ _null_ pg_switch_xlog _null_ _null_ _null_ ));
DESCR("switch to new xlog file");
DATA(insert OID = 3098 ( pg_create_restore_point PGNSP PGUID 12 1 0 0 0 f f f f t f v 1 0 25 "25" _null_ _null_ _null_ _null_ pg_create_restore_point _null_ _null_ _null_ ));