diff options
Diffstat (limited to 'nscd/nscd_gethst_r.c')
| -rw-r--r-- | nscd/nscd_gethst_r.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/nscd/nscd_gethst_r.c b/nscd/nscd_gethst_r.c index 42327dd317..407be1441f 100644 --- a/nscd/nscd_gethst_r.c +++ b/nscd/nscd_gethst_r.c @@ -27,7 +27,6 @@ #include <string.h> #include <unistd.h> #include <arpa/nameser.h> -#include <sys/mman.h> #include <not-cancel.h> #include "nscd-client.h" @@ -94,7 +93,6 @@ libc_locked_map_ptr (map_handle); handling. */ libc_freeres_fn (gr_map_free) { - if (map_handle.mapped != NO_MAPPING) free (map_handle.mapped); } @@ -106,22 +104,24 @@ nscd_gethst_r (const char *key, size_t keylen, request_type type, struct hostent *resultbuf, char *buffer, size_t buflen, struct hostent **result, int *h_errnop) { + int gc_cycle; + int nretries = 0; + + /* If the mapping is available, try to search there instead of + communicating with the nscd. */ + struct mapped_database *mapped; + mapped = __nscd_get_map_ref (GETFDHST, "hosts", &map_handle, &gc_cycle); + + retry:; const hst_response_header *hst_resp = NULL; const char *h_name = NULL; const uint32_t *aliases_len = NULL; const char *addr_list = NULL; size_t addr_list_len = 0; int retval = -1; - int gc_cycle; const char *recend = (const char *) ~UINTMAX_C (0); int sock = -1; - - /* If the mapping is available, try to search there instead of - communicating with the nscd. */ - struct mapped_database *mapped = __nscd_get_map_ref (GETFDHST, "hosts", - &map_handle, &gc_cycle); - retry: - if (mapped != MAP_FAILED) + if (mapped != NO_MAPPING) { const struct datahead *found = __nscd_cache_search (type, key, keylen, mapped); @@ -355,11 +355,20 @@ nscd_gethst_r (const char *key, size_t keylen, request_type type, if (sock != -1) close_not_cancel_no_status (sock); out: - if (__nscd_drop_map_ref (mapped, gc_cycle) != 0) - /* When we come here this means there has been a GC cycle while we - were looking for the data. This means the data might have been - inconsistent. Retry. */ - goto retry; + if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0 && retval != -1) + { + /* When we come here this means there has been a GC cycle while we + were looking for the data. This means the data might have been + inconsistent. Retry if possible. */ + if ((gc_cycle & 1) != 0 || ++nretries == 5) + { + /* nscd is just running gc now. Disable using the mapping. */ + __nscd_unmap (mapped); + mapped = NO_MAPPING; + } + + goto retry; + } return retval; } |