* sysdeps/i386/fpu/s_fdim.S (__fdim): Handle +inf/+inf.
[glibc.git] / nscd / nscd_getai.c
bloba9eac48ac8183348067661cdeb67aa5fe837a1d3
1 /* Copyright (C) 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <assert.h>
21 #include <errno.h>
22 #include <netdb.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26 #include <sys/mman.h>
27 #include <not-cancel.h>
29 #include "nscd-client.h"
30 #include "nscd_proto.h"
33 /* Define in nscd_gethst_r.c. */
34 extern int __nss_not_use_nscd_hosts;
37 libc_locked_map_ptr (map_handle);
38 /* Note that we only free the structure if necessary. The memory
39 mapping is not removed since it is not visible to the malloc
40 handling. */
41 libc_freeres_fn (ai_map_free)
44 if (map_handle.mapped != NO_MAPPING)
45 free (map_handle.mapped);
49 int
50 __nscd_getai (const char *key, struct nscd_ai_result **result, int *h_errnop)
52 size_t keylen = strlen (key) + 1;
53 const ai_response_header *ai_resp = NULL;
54 struct nscd_ai_result *resultbuf = NULL;
55 const char *recend = (const char *) ~UINTMAX_C (0);
56 char *respdata = NULL;
57 int retval = -1;
58 int sock = -1;
59 int gc_cycle;
61 /* If the mapping is available, try to search there instead of
62 communicating with the nscd. */
63 struct mapped_database *mapped = __nscd_get_map_ref (GETFDHST, "hosts",
64 &map_handle, &gc_cycle);
65 retry:
66 if (mapped != NO_MAPPING)
68 const struct datahead *found = __nscd_cache_search (GETAI, key, keylen,
69 mapped);
70 if (found != NULL)
72 ai_resp = &found->data[0].aidata;
73 respdata = (char *) (ai_resp + 1);
74 recend = (const char *) found->data + found->recsize;
78 /* If we do not have the cache mapped, try to get the data over the
79 socket. */
80 ai_response_header ai_resp_mem;
81 if (ai_resp == NULL)
83 sock = __nscd_open_socket (key, keylen, GETAI, &ai_resp_mem,
84 sizeof (ai_resp_mem));
85 if (sock == -1)
87 /* nscd not running or wrong version or hosts caching disabled. */
88 __nss_not_use_nscd_hosts = 1;
89 goto out;
92 ai_resp = &ai_resp_mem;
95 if (ai_resp->found == 1)
97 size_t datalen = ai_resp->naddrs + ai_resp->addrslen + ai_resp->canonlen;
99 /* This check is really only affects the case where the data
100 comes from the mapped cache. */
101 if ((char *) (ai_resp + 1) + datalen > recend)
103 assert (sock == -1);
104 goto out;
107 /* Create result. */
108 resultbuf = (struct nscd_ai_result *) malloc (sizeof (*resultbuf)
109 + datalen);
110 if (resultbuf == NULL)
112 *h_errnop = NETDB_INTERNAL;
113 return -1;
116 /* Set up the data structure, including pointers. */
117 resultbuf->naddrs = ai_resp->naddrs;
118 resultbuf->addrs = (char *) (resultbuf + 1);
119 resultbuf->family = (uint8_t *) (resultbuf->addrs + ai_resp->addrslen);
120 if (ai_resp->canonlen != 0)
121 resultbuf->canon = (char *) (resultbuf->family + resultbuf->naddrs);
122 else
123 resultbuf->canon = NULL;
125 if (respdata == NULL)
127 /* Read the data from the socket. */
128 if ((size_t) TEMP_FAILURE_RETRY (__read (sock, resultbuf + 1,
129 datalen)) == datalen)
131 retval = 0;
132 *result = resultbuf;
135 else
137 /* Copy the data in the block. */
138 memcpy (resultbuf + 1, respdata, datalen);
140 retval = 0;
141 *result = resultbuf;
144 else
146 /* Store the error number. */
147 *h_errnop = ai_resp->error;
149 /* The `errno' to some value != ERANGE. */
150 __set_errno (ENOENT);
151 /* Even though we have not found anything, the result is zero. */
152 retval = 0;
155 if (sock != -1)
156 close_not_cancel_no_status (sock);
157 out:
158 if (__nscd_drop_map_ref (mapped, gc_cycle) != 0)
159 /* When we come here this means there has been a GC cycle while we
160 were looking for the data. This means the data might have been
161 inconsistent. Retry. */
162 goto retry;
164 return retval;