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authorUlrich Drepper <drepper@gmail.com>2011-01-15 11:10:11 -0500
committerUlrich Drepper <drepper@gmail.com>2011-01-15 11:10:11 -0500
commitbc425b339b067bebe3d49907e63b0e81eb261bd2 (patch)
tree685e2cf06b640c0410b70cbedd9ff434798ecf7c /nscd/hstcache.c
parent70181fddf1467996bea393d13294ffe76b8a0853 (diff)
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Signal temporary host lookup errors in nscd as such to the requester.
Diffstat (limited to 'nscd/hstcache.c')
-rw-r--r--nscd/hstcache.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/nscd/hstcache.c b/nscd/hstcache.c
index 228f6fd..a6055cf 100644
--- a/nscd/hstcache.c
+++ b/nscd/hstcache.c
@@ -1,5 +1,5 @@
/* Cache handling for host lookup.
- Copyright (C) 1998-2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 1998-2008, 2009, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
@@ -77,6 +77,20 @@ static const hst_response_header notfound =
};
+/* This is the standard reply in case there are temporary problems. */
+static const hst_response_header tryagain =
+{
+ .version = NSCD_VERSION,
+ .found = 0,
+ .h_name_len = 0,
+ .h_aliases_cnt = 0,
+ .h_addrtype = -1,
+ .h_length = -1,
+ .h_addr_list_cnt = 0,
+ .error = TRY_AGAIN
+};
+
+
static void
cache_addhst (struct database_dyn *db, int fd, request_header *req,
const void *key, struct hostent *hst, uid_t owner,
@@ -111,11 +125,15 @@ cache_addhst (struct database_dyn *db, int fd, request_header *req,
else
{
/* We have no data. This means we send the standard reply for this
- case. */
+ case. Possibly this is only temporary. */
ssize_t total = sizeof (notfound);
+ assert (sizeof (notfound) == sizeof (tryagain));
+
+ const hst_response_header *resp = (errval == EAGAIN
+ ? &tryagain : &notfound);
if (fd != -1 &&
- TEMP_FAILURE_RETRY (send (fd, &notfound, total,
+ TEMP_FAILURE_RETRY (send (fd, resp, total,
MSG_NOSIGNAL)) != total)
all_written = false;
@@ -135,7 +153,7 @@ cache_addhst (struct database_dyn *db, int fd, request_header *req,
? db->negtimeout : ttl);
/* This is the reply. */
- memcpy (&dataset->resp, &notfound, total);
+ memcpy (&dataset->resp, resp, total);
/* Copy the key data. */
memcpy (dataset->strdata, key, req->key_len);
@@ -490,6 +508,7 @@ addhstbyX (struct database_dyn *db, int fd, request_header *req,
/* We set the error to indicate this is (possibly) a
temporary error and that it does not mean the entry
is not available at all. */
+ h_errno = TRY_AGAIN;
errval = EAGAIN;
break;
}