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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-31 01:51:16 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-31 01:51:16 -0400 |
| commit | 3a2c02424d9824f5cdea4ebd32ff929b2b1f49c6 (patch) | |
| tree | de7827ff96076cb4d181ed781c418601906fa772 /nscd/nscd_gethst_r.c | |
| parent | 636064eb4c03397c86aa26e489e68f952bd5e53f (diff) | |
| download | glibc-3a2c02424d9824f5cdea4ebd32ff929b2b1f49c6.tar.gz glibc-3a2c02424d9824f5cdea4ebd32ff929b2b1f49c6.tar.xz glibc-3a2c02424d9824f5cdea4ebd32ff929b2b1f49c6.zip | |
Cache network interface information
Whenever getaddrinfo needed network interface information it used the netlink interface to read the information every single time. The problem is that this information can change at any time. The patch implements monitoring of the network interfaces through nscd. If no change is detected the previously read information can be reused (which is the norm). This timestamp information is also made available to other processes using the shared memory segment between nscd and those processes.
Diffstat (limited to 'nscd/nscd_gethst_r.c')
| -rw-r--r-- | nscd/nscd_gethst_r.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/nscd/nscd_gethst_r.c b/nscd/nscd_gethst_r.c index 70631fa961..6ee142d71b 100644 --- a/nscd/nscd_gethst_r.c +++ b/nscd/nscd_gethst_r.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009 +/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. @@ -98,6 +98,27 @@ libc_freeres_fn (hst_map_free) } +uint32_t +__nscd_get_nl_timestamp (void) +{ + if (__nss_not_use_nscd_hosts != 0) + return 0; + + struct mapped_database *map = __hst_map_handle.mapped; + + if (map == NULL + || (map != NO_MAPPING + && map->head->nscd_certainly_running == 0 + && map->head->timestamp + MAPPING_TIMEOUT < time (NULL))) + map = __nscd_get_mapping (GETFDHST, "hosts", &__hst_map_handle.mapped); + + if (map == NO_MAPPING) + return 0; + + return map->head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]; +} + + int __nss_have_localdomain attribute_hidden; static int |