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Diffstat (limited to 'src/backend/access/transam/xlog.c')
| -rw-r--r-- | src/backend/access/transam/xlog.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index a63a8853ee3..615ce5c7fd0 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -3760,10 +3760,16 @@ PreallocXlogFiles(XLogRecPtr endptr) * existed while the server has been running, as this function always * succeeds if no WAL segments have been removed since startup. * 'tli' is only used in the error message. + * + * Note: this function guarantees to keep errno unchanged on return. + * This supports callers that use this to possibly deliver a better + * error message about a missing file, while still being able to throw + * a normal file-access error afterwards, if this does return. */ void CheckXLogRemoved(XLogSegNo segno, TimeLineID tli) { + int save_errno = errno; XLogSegNo lastRemovedSegNo; SpinLockAcquire(&XLogCtl->info_lck); @@ -3775,11 +3781,13 @@ CheckXLogRemoved(XLogSegNo segno, TimeLineID tli) char filename[MAXFNAMELEN]; XLogFileName(filename, tli, segno); + errno = save_errno; ereport(ERROR, (errcode_for_file_access(), errmsg("requested WAL segment %s has already been removed", filename))); } + errno = save_errno; } /* |