diff options
Diffstat (limited to 'nscd/nscd_getgr_r.c')
| -rw-r--r-- | nscd/nscd_getgr_r.c | 47 |
1 files changed, 33 insertions, 14 deletions
diff --git a/nscd/nscd_getgr_r.c b/nscd/nscd_getgr_r.c index 3a66bb849b..9e8170f0f2 100644 --- a/nscd/nscd_getgr_r.c +++ b/nscd/nscd_getgr_r.c @@ -18,6 +18,7 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <alloca.h> #include <assert.h> #include <errno.h> #include <grp.h> @@ -84,19 +85,21 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type, struct group *resultbuf, char *buffer, size_t buflen, struct group **result) { - const gr_response_header *gr_resp = NULL; - const uint32_t *len = NULL; - const char *gr_name = NULL; - size_t gr_name_len = 0; - int retval = -1; int gc_cycle; - const char *recend = (const char *) ~UINTMAX_C (0); + const uint32_t *len = NULL; + size_t lensize = 0; /* If the mapping is available, try to search there instead of communicating with the nscd. */ struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group", &map_handle, &gc_cycle); - retry: + retry:; + const gr_response_header *gr_resp = NULL; + const char *gr_name = NULL; + size_t gr_name_len = 0; + int retval = -1; + const char *recend = (const char *) ~UINTMAX_C (0); + if (mapped != NO_MAPPING) { const struct datahead *found = __nscd_cache_search (type, key, keylen, @@ -176,10 +179,17 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type, resultbuf->gr_gid = gr_resp->gr_gid; /* Read the length information, group name, and password. */ - if (len == NULL) + if (gr_name == NULL) { /* Allocate array to store lengths. */ - len = (uint32_t *) alloca (gr_resp->gr_mem_cnt * sizeof (uint32_t)); + if (lensize == 0) + { + lensize = gr_resp->gr_mem_cnt * sizeof (uint32_t); + len = (uint32_t *) alloca (lensize); + } + else if (gr_resp->gr_mem_cnt * sizeof (uint32_t) > lensize) + len = extend_alloca (len, lensize, + gr_resp->gr_mem_cnt * sizeof (uint32_t)); vec[0].iov_base = (void *) len; vec[0].iov_len = gr_resp->gr_mem_cnt * sizeof (uint32_t); @@ -248,11 +258,20 @@ nscd_getgr_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) + { + /* nscd is just running gc now. Disable using the mapping. */ + __nscd_unmap (mapped); + mapped = NO_MAPPING; + } + + goto retry; + } return retval; } |