[thirdparty/glibc.git] / nscd / nscd_getgr_r.c

/* Copyright (C) 1998-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <alloca.h>
#include <assert.h>
#include <errno.h>
#include <grp.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <not-cancel.h>
#include <_itoa.h>
#include <scratch_buffer.h>

#include "nscd-client.h"
#include "nscd_proto.h"

int __nss_not_use_nscd_group;

static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
			 struct group *resultbuf, char *buffer,
			 size_t buflen, struct group **result);


int
__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
		   size_t buflen, struct group **result)
{
  return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
		       buffer, buflen, result);
}


int
__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
		   size_t buflen, struct group **result)
{
  char buf[3 * sizeof (gid_t)];
  buf[sizeof (buf) - 1] = '\0';
  char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);

  return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
		       buffer, buflen, result);
}


libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
/* Note that we only free the structure if necessary.  The memory
   mapping is not removed since it is not visible to the malloc
   handling.  */
libc_freeres_fn (gr_map_free)
{
  if (__gr_map_handle.mapped != NO_MAPPING)
    {
      void *p = __gr_map_handle.mapped;
      __gr_map_handle.mapped = NO_MAPPING;
      free (p);
    }
}


static int
nscd_getgr_r (const char *key, size_t keylen, request_type type,
	      struct group *resultbuf, char *buffer, size_t buflen,
	      struct group **result)
{
  int gc_cycle;
  int nretries = 0;
  const uint32_t *len = NULL;
  struct scratch_buffer lenbuf;
  scratch_buffer_init (&lenbuf);

  /* 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",
						       &__gr_map_handle,
						       &gc_cycle);
 retry:;
  const char *gr_name = NULL;
  size_t gr_name_len = 0;
  int retval = -1;
  const char *recend = (const char *) ~UINTMAX_C (0);
  gr_response_header gr_resp;

  if (mapped != NO_MAPPING)
    {
      struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
						    sizeof gr_resp);
      if (found != NULL)
	{
	  len = (const uint32_t *) (&found->data[0].grdata + 1);
	  gr_resp = found->data[0].grdata;
	  gr_name = ((const char *) len
		     + gr_resp.gr_mem_cnt * sizeof (uint32_t));
	  gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	  recend = (const char *) found->data + found->recsize;
	  /* Now check if we can trust gr_resp fields.  If GC is
	     in progress, it can contain anything.  */
	  if (mapped->head->gc_cycle != gc_cycle)
	    {
	      retval = -2;
	      goto out;
	    }

	  /* The alignment is always sufficient, unless GC is in progress.  */
	  assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
	}
    }

  int sock = -1;
  if (gr_name == NULL)
    {
      sock = __nscd_open_socket (key, keylen, type, &gr_resp,
				 sizeof (gr_resp));
      if (sock == -1)
	{
	  __nss_not_use_nscd_group = 1;
	  goto out;
	}
    }

  /* No value found so far.  */
  *result = NULL;

  if (__glibc_unlikely (gr_resp.found == -1))
    {
      /* The daemon does not cache this database.  */
      __nss_not_use_nscd_group = 1;
      goto out_close;
    }

  if (gr_resp.found == 1)
    {
      struct iovec vec[2];
      char *p = buffer;
      size_t total_len;
      uintptr_t align;
      nscd_ssize_t cnt;

      /* Now allocate the buffer the array for the group members.  We must
	 align the pointer.  */
      align = ((__alignof__ (char *) - (p - ((char *) 0)))
	       & (__alignof__ (char *) - 1));
      total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
		   + gr_resp.gr_name_len + gr_resp.gr_passwd_len);
      if (__glibc_unlikely (buflen < total_len))
	{
	no_room:
	  __set_errno (ERANGE);
	  retval = ERANGE;
	  goto out_close;
	}
      buflen -= total_len;

      p += align;
      resultbuf->gr_mem = (char **) p;
      p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);

      /* Set pointers for strings.  */
      resultbuf->gr_name = p;
      p += gr_resp.gr_name_len;
      resultbuf->gr_passwd = p;
      p += gr_resp.gr_passwd_len;

      /* Fill in what we know now.  */
      resultbuf->gr_gid = gr_resp.gr_gid;

      /* Read the length information, group name, and password.  */
      if (gr_name == NULL)
	{
	  /* Handle a simple, usual case: no group members.  */
	  if (__glibc_likely (gr_resp.gr_mem_cnt == 0))
	    {
	      size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	      if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
				    != (ssize_t) n, 0))
		goto out_close;
	    }
	  else
	    {
	      /* Allocate array to store lengths.  */
	      if (!scratch_buffer_set_array_size
		  (&lenbuf, gr_resp.gr_mem_cnt, sizeof (uint32_t)))
		goto out_close;
	      len = lenbuf.data;

	      vec[0].iov_base = (void *) len;
	      vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	      vec[1].iov_base = resultbuf->gr_name;
	      vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	      total_len = vec[0].iov_len + vec[1].iov_len;

	      /* Get this data.  */
	      size_t n = __readvall (sock, vec, 2);
	      if (__glibc_unlikely (n != total_len))
		goto out_close;
	    }
	}
      else
	/* We already have the data.  Just copy the group name and
	   password.  */
	memcpy (resultbuf->gr_name, gr_name,
		gr_resp.gr_name_len + gr_resp.gr_passwd_len);

      /* Clear the terminating entry.  */
      resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;

      /* Prepare reading the group members.  */
      total_len = 0;
      for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
	{
	  resultbuf->gr_mem[cnt] = p;
	  total_len += len[cnt];
	  p += len[cnt];
	}

      if (__glibc_unlikely (gr_name + gr_name_len + total_len > recend))
	{
	  /* len array might contain garbage during nscd GC cycle,
	     retry rather than fail in that case.  */
	  if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	    retval = -2;
	  goto out_close;
	}
      if (__glibc_unlikely (total_len > buflen))
	{
	  /* len array might contain garbage during nscd GC cycle,
	     retry rather than fail in that case.  */
	  if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	    {
	      retval = -2;
	      goto out_close;
	    }
	  else
	    goto no_room;
	}

      retval = 0;

      /* If there are no group members TOTAL_LEN is zero.  */
      if (gr_name == NULL)
	{
	  if (total_len > 0
	      && __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
					      total_len) != total_len, 0))
	    {
	      /* The `errno' to some value != ERANGE.  */
	      __set_errno (ENOENT);
	      retval = ENOENT;
	    }
	  else
	    *result = resultbuf;
	}
      else
	{
	  /* Copy the group member names.  */
	  memcpy (resultbuf->gr_mem[0], gr_name + gr_name_len, total_len);

	  /* Try to detect corrupt databases.  */
	  if (resultbuf->gr_name[gr_name_len - 1] != '\0'
	      || resultbuf->gr_passwd[gr_resp.gr_passwd_len - 1] != '\0'
	      || ({for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
		    if (resultbuf->gr_mem[cnt][len[cnt] - 1] != '\0')
		      break;
		  cnt < gr_resp.gr_mem_cnt; }))
	    {
	      /* We cannot use the database.  */
	      retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
	      goto out_close;
	    }

	  *result = resultbuf;
	}
    }
  else
    {
      /* Set errno to 0 to indicate no error, just no found record.  */
      __set_errno (0);
      /* Even though we have not found anything, the result is zero.  */
      retval = 0;
    }

 out_close:
  if (sock != -1)
    __close_nocancel_nostatus (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 if possible.  */
      if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
	{
	  /* nscd is just running gc now.  Disable using the mapping.  */
	  if (atomic_decrement_val (&mapped->counter) == 0)
	    __nscd_unmap (mapped);
	  mapped = NO_MAPPING;
	}

      if (retval != -1)
	goto retry;
    }

  scratch_buffer_free (&lenbuf);

  return retval;
}
Commit	Line	Data
04277e02	1	/* Copyright (C) 1998-2019 Free Software Foundation, Inc.
d67281a7 UD	2	This file is part of the GNU C Library.
	3	Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	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.
d67281a7 UD	9
	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
41bdb6e2	13	Lesser General Public License for more details.
d67281a7	14
41bdb6e2	15	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	16	License along with the GNU C Library; if not, see
59ba27a6 PE	17	<http://www.gnu.org/licenses/>. */
d67281a7	18
0891f970	19	#include <alloca.h>
c207f23b	20	#include <assert.h>
d67281a7 UD	21	#include <errno.h>
d67281a7 UD	22	#include <grp.h>
390955cb	23	#include <stdint.h>
d67281a7 UD	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <unistd.h>
c207f23b	28	#include <sys/mman.h>
d67281a7	29	#include <sys/socket.h>
264d5b94	30	#include <sys/uio.h>
d67281a7	31	#include <sys/un.h>
40c38b6c	32	#include <not-cancel.h>
eb96ffb0	33	#include <_itoa.h>
561052ad	34	#include <scratch_buffer.h>
d67281a7	35
3f804c95	36	#include "nscd-client.h"
d67281a7 UD	37	#include "nscd_proto.h"
d67281a7 UD	38
ac16e905 UD	39	int __nss_not_use_nscd_group;
ac16e905 UD	40
67479a70 UD	41	static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
67479a70 UD	42	struct group resultbuf, char buffer,
75b3047e	43	size_t buflen, struct group **result);
67479a70	44
d67281a7 UD	45
	46	int
	47	__nscd_getgrnam_r (const char name, struct group resultbuf, char *buffer,
261eada2	48	size_t buflen, struct group **result)
d67281a7	49	{
67479a70	50	return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
261eada2	51	buffer, buflen, result);
d67281a7 UD	52	}
d67281a7 UD	53
67479a70	54
d67281a7 UD	55	int
d67281a7 UD	56	__nscd_getgrgid_r (gid_t gid, struct group resultbuf, char buffer,
261eada2	57	size_t buflen, struct group **result)
d67281a7	58	{
40c38b6c UD	59	char buf[3 * sizeof (gid_t)];
	60	buf[sizeof (buf) - 1] = '\0';
	61	char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);
d67281a7	62
40c38b6c UD	63	return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
40c38b6c UD	64	buffer, buflen, result);
d67281a7 UD	65	}
d67281a7 UD	66
67479a70	67
6f8a7dff	68	libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
c207f23b UD	69	/* Note that we only free the structure if necessary. The memory
	70	mapping is not removed since it is not visible to the malloc
	71	handling. */
	72	libc_freeres_fn (gr_map_free)
	73	{
ed2ced8a UD	74	if (__gr_map_handle.mapped != NO_MAPPING)
	75	{
	76	void *p = __gr_map_handle.mapped;
	77	__gr_map_handle.mapped = NO_MAPPING;
	78	free (p);
	79	}
c207f23b UD	80	}
	81
	82
d67281a7	83	static int
67479a70	84	nscd_getgr_r (const char *key, size_t keylen, request_type type,
a95a08b4	85	struct group resultbuf, char buffer, size_t buflen,
261eada2	86	struct group **result)
d67281a7	87	{
c207f23b	88	int gc_cycle;
1a77d37f	89	int nretries = 0;
0891f970	90	const uint32_t *len = NULL;
561052ad FW	91	struct scratch_buffer lenbuf;
561052ad FW	92	scratch_buffer_init (&lenbuf);
c207f23b UD	93
	94	/* If the mapping is available, try to search there instead of
	95	communicating with the nscd. */
	96	struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
ed2ced8a UD	97	&__gr_map_handle,
ed2ced8a UD	98	&gc_cycle);
0891f970	99	retry:;
0891f970 UD	100	const char *gr_name = NULL;
	101	size_t gr_name_len = 0;
	102	int retval = -1;
	103	const char recend = (const char ) ~UINTMAX_C (0);
1a77d37f	104	gr_response_header gr_resp;
0891f970	105
c207f23b	106	if (mapped != NO_MAPPING)
ac16e905	107	{
cfe1fc10 JJ	108	struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
cfe1fc10 JJ	109	sizeof gr_resp);
c207f23b UD	110	if (found != NULL)
c207f23b UD	111	{
1a77d37f JJ	112	len = (const uint32_t *) (&found->data[0].grdata + 1);
1a77d37f JJ	113	gr_resp = found->data[0].grdata;
c207f23b	114	gr_name = ((const char *) len
1a77d37f JJ	115	+ gr_resp.gr_mem_cnt * sizeof (uint32_t));
1a77d37f JJ	116	gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
c207f23b	117	recend = (const char *) found->data + found->recsize;
1a77d37f JJ	118	/* Now check if we can trust gr_resp fields. If GC is
	119	in progress, it can contain anything. */
	120	if (mapped->head->gc_cycle != gc_cycle)
	121	{
	122	retval = -2;
	123	goto out;
	124	}
	125
	126	/* The alignment is always sufficient, unless GC is in progress. */
	127	assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
c207f23b UD	128	}
	129	}
	130
c207f23b	131	int sock = -1;
1a77d37f	132	if (gr_name == NULL)
c207f23b	133	{
1a77d37f JJ	134	sock = __nscd_open_socket (key, keylen, type, &gr_resp,
1a77d37f JJ	135	sizeof (gr_resp));
c207f23b UD	136	if (sock == -1)
	137	{
	138	__nss_not_use_nscd_group = 1;
	139	goto out;
	140	}
ac16e905	141	}
d67281a7	142
16aac663 UD	143	/* No value found so far. */
	144	*result = NULL;
	145
a1ffb40e	146	if (__glibc_unlikely (gr_resp.found == -1))
d67281a7	147	{
ac16e905	148	/* The daemon does not cache this database. */
ac16e905	149	__nss_not_use_nscd_group = 1;
c207f23b	150	goto out_close;
d67281a7 UD	151	}
d67281a7 UD	152
1a77d37f	153	if (gr_resp.found == 1)
d67281a7	154	{
40c38b6c	155	struct iovec vec[2];
d67281a7	156	char *p = buffer;
264d5b94 UD	157	size_t total_len;
264d5b94 UD	158	uintptr_t align;
eb64f8cb	159	nscd_ssize_t cnt;
d67281a7	160
67479a70 UD	161	/* Now allocate the buffer the array for the group members. We must
	162	align the pointer. */
	163	align = ((__alignof__ (char ) - (p - ((char ) 0)))
	164	& (__alignof__ (char *) - 1));
1a77d37f JJ	165	total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
1a77d37f JJ	166	+ gr_resp.gr_name_len + gr_resp.gr_passwd_len);
a1ffb40e	167	if (__glibc_unlikely (buflen < total_len))
d67281a7	168	{
67479a70	169	no_room:
d67281a7	170	__set_errno (ERANGE);
261eada2	171	retval = ERANGE;
c207f23b	172	goto out_close;
d67281a7	173	}
bd952512	174	buflen -= total_len;
264d5b94	175
67479a70	176	p += align;
a95a08b4	177	resultbuf->gr_mem = (char **) p;
1a77d37f	178	p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
264d5b94	179
67479a70	180	/* Set pointers for strings. */
a95a08b4	181	resultbuf->gr_name = p;
1a77d37f	182	p += gr_resp.gr_name_len;
a95a08b4	183	resultbuf->gr_passwd = p;
1a77d37f	184	p += gr_resp.gr_passwd_len;
d67281a7	185
67479a70	186	/* Fill in what we know now. */
1a77d37f	187	resultbuf->gr_gid = gr_resp.gr_gid;
264d5b94	188
c207f23b	189	/* Read the length information, group name, and password. */
0891f970	190	if (gr_name == NULL)
c207f23b	191	{
43d3e6bd	192	/* Handle a simple, usual case: no group members. */
a1ffb40e	193	if (__glibc_likely (gr_resp.gr_mem_cnt == 0))
0891f970	194	{
43d3e6bd UD	195	size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	196	if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
	197	!= (ssize_t) n, 0))
	198	goto out_close;
	199	}
	200	else
	201	{
	202	/* Allocate array to store lengths. */
561052ad FW	203	if (!scratch_buffer_set_array_size
	204	(&lenbuf, gr_resp.gr_mem_cnt, sizeof (uint32_t)))
	205	goto out_close;
	206	len = lenbuf.data;
43d3e6bd UD	207
	208	vec[0].iov_base = (void *) len;
	209	vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	210	vec[1].iov_base = resultbuf->gr_name;
	211	vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	212	total_len = vec[0].iov_len + vec[1].iov_len;
	213
	214	/* Get this data. */
	215	size_t n = __readvall (sock, vec, 2);
a1ffb40e	216	if (__glibc_unlikely (n != total_len))
43d3e6bd	217	goto out_close;
0891f970	218	}
c207f23b UD	219	}
	220	else
	221	/* We already have the data. Just copy the group name and
	222	password. */
5429ff76	223	memcpy (resultbuf->gr_name, gr_name,
1a77d37f	224	gr_resp.gr_name_len + gr_resp.gr_passwd_len);
264d5b94	225
67479a70	226	/* Clear the terminating entry. */
1a77d37f	227	resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
d67281a7	228
67479a70 UD	229	/* Prepare reading the group members. */
67479a70 UD	230	total_len = 0;
1a77d37f	231	for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
d67281a7	232	{
a95a08b4	233	resultbuf->gr_mem[cnt] = p;
67479a70 UD	234	total_len += len[cnt];
67479a70 UD	235	p += len[cnt];
d67281a7	236	}
d67281a7	237
a1ffb40e	238	if (__glibc_unlikely (gr_name + gr_name_len + total_len > recend))
1a77d37f JJ	239	{
	240	/* len array might contain garbage during nscd GC cycle,
	241	retry rather than fail in that case. */
	242	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	243	retval = -2;
	244	goto out_close;
	245	}
a1ffb40e	246	if (__glibc_unlikely (total_len > buflen))
1a77d37f JJ	247	{
	248	/* len array might contain garbage during nscd GC cycle,
	249	retry rather than fail in that case. */
	250	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	251	{
	252	retval = -2;
	253	goto out_close;
	254	}
	255	else
	256	goto no_room;
	257	}
d67281a7	258
a95a08b4	259	retval = 0;
43d3e6bd UD	260
43d3e6bd UD	261	/* If there are no group members TOTAL_LEN is zero. */
fa76dde2	262	if (gr_name == NULL)
d67281a7	263	{
895a08c0 UD	264	if (total_len > 0
	265	&& __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
	266	total_len) != total_len, 0))
c207f23b	267	{
895a08c0 UD	268	/* The `errno' to some value != ERANGE. */
	269	__set_errno (ENOENT);
	270	retval = ENOENT;
c207f23b	271	}
895a08c0 UD	272	else
895a08c0 UD	273	*result = resultbuf;
fa76dde2 UD	274	}
	275	else
	276	{
	277	/* Copy the group member names. */
	278	memcpy (resultbuf->gr_mem[0], gr_name + gr_name_len, total_len);
	279
	280	/* Try to detect corrupt databases. */
	281	if (resultbuf->gr_name[gr_name_len - 1] != '\0'
	282	\|\| resultbuf->gr_passwd[gr_resp.gr_passwd_len - 1] != '\0'
	283	\|\| ({for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
	284	if (resultbuf->gr_mem[cnt][len[cnt] - 1] != '\0')
	285	break;
	286	cnt < gr_resp.gr_mem_cnt; }))
5429ff76	287	{
fa76dde2 UD	288	/* We cannot use the database. */
	289	retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
	290	goto out_close;
5429ff76	291	}
fa76dde2 UD	292
fa76dde2 UD	293	*result = resultbuf;
c207f23b	294	}
14e9dd67 UD	295	}
	296	else
	297	{
cfca0aa3 UD	298	/* Set errno to 0 to indicate no error, just no found record. */
cfca0aa3 UD	299	__set_errno (0);
261eada2 UD	300	/* Even though we have not found anything, the result is zero. */
261eada2 UD	301	retval = 0;
d67281a7	302	}
12c80513	303
c207f23b UD	304	out_close:
c207f23b UD	305	if (sock != -1)
c181840c	306	__close_nocancel_nostatus (sock);
12c80513	307	out:
1a77d37f	308	if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
0891f970 UD	309	{
	310	/* When we come here this means there has been a GC cycle while we
	311	were looking for the data. This means the data might have been
	312	inconsistent. Retry if possible. */
1a77d37f	313	if ((gc_cycle & 1) != 0 \|\| ++nretries == 5 \|\| retval == -1)
0891f970 UD	314	{
0891f970 UD	315	/* nscd is just running gc now. Disable using the mapping. */
1a77d37f JJ	316	if (atomic_decrement_val (&mapped->counter) == 0)
1a77d37f JJ	317	__nscd_unmap (mapped);
0891f970 UD	318	mapped = NO_MAPPING;
	319	}
	320
1a77d37f JJ	321	if (retval != -1)
1a77d37f JJ	322	goto retry;
0891f970	323	}
12c80513	324
561052ad FW	325	scratch_buffer_free (&lenbuf);
561052ad FW	326
261eada2	327	return retval;
d67281a7	328	}