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

/* Copyright (C) 1998-2000, 2002-2005, 2006, 2007, 2009
   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 <stdio-common/_itoa.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)
     internal_function;


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
internal_function
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;
  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",
						       &__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 (__builtin_expect (gr_resp.found == -1, 0))
    {
      /* 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 (__builtin_expect (buflen < total_len, 0))
	{
	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 (__builtin_expect (gr_resp.gr_mem_cnt == 0, 1))
	    {
	      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 (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);
	      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 (__builtin_expect (n != total_len, 0))
		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 (__builtin_expect (gr_name + gr_name_len + total_len > recend, 0))
	{
	  /* 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 (__builtin_expect (total_len > buflen, 0))
	{
	  /* 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_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 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;
    }

  return retval;
}
Commit	Line	Data
cfe1fc10	1	/* Copyright (C) 1998-2000, 2002-2005, 2006, 2007, 2009
1a77d37f	2	Free Software Foundation, Inc.
d67281a7 UD	3	This file is part of the GNU C Library.
	4	Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
d67281a7 UD	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
d67281a7	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	17	License along with the GNU C Library; if not, see
59ba27a6 PE	18	<http://www.gnu.org/licenses/>. */
d67281a7	19
0891f970	20	#include <alloca.h>
c207f23b	21	#include <assert.h>
d67281a7 UD	22	#include <errno.h>
d67281a7 UD	23	#include <grp.h>
390955cb	24	#include <stdint.h>
d67281a7 UD	25	#include <stdio.h>
	26	#include <stdlib.h>
	27	#include <string.h>
	28	#include <unistd.h>
c207f23b	29	#include <sys/mman.h>
d67281a7	30	#include <sys/socket.h>
264d5b94	31	#include <sys/uio.h>
d67281a7	32	#include <sys/un.h>
40c38b6c	33	#include <not-cancel.h>
9b9ef823	34	#include <stdio-common/_itoa.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,
261eada2 UD	43	size_t buflen, struct group **result)
261eada2 UD	44	internal_function;
67479a70	45
d67281a7 UD	46
	47	int
	48	__nscd_getgrnam_r (const char name, struct group resultbuf, char *buffer,
261eada2	49	size_t buflen, struct group **result)
d67281a7	50	{
67479a70	51	return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
261eada2	52	buffer, buflen, result);
d67281a7 UD	53	}
d67281a7 UD	54
67479a70	55
d67281a7 UD	56	int
d67281a7 UD	57	__nscd_getgrgid_r (gid_t gid, struct group resultbuf, char buffer,
261eada2	58	size_t buflen, struct group **result)
d67281a7	59	{
40c38b6c UD	60	char buf[3 * sizeof (gid_t)];
	61	buf[sizeof (buf) - 1] = '\0';
	62	char *cp = _itoa_word (gid, buf + sizeof (buf) - 1, 10, 0);
d67281a7	63
40c38b6c UD	64	return nscd_getgr_r (cp, buf + sizeof (buf) - cp, GETGRBYGID, resultbuf,
40c38b6c UD	65	buffer, buflen, result);
d67281a7 UD	66	}
d67281a7 UD	67
67479a70	68
6f8a7dff	69	libc_locked_map_ptr (,__gr_map_handle) attribute_hidden;
c207f23b UD	70	/* Note that we only free the structure if necessary. The memory
	71	mapping is not removed since it is not visible to the malloc
	72	handling. */
	73	libc_freeres_fn (gr_map_free)
	74	{
ed2ced8a UD	75	if (__gr_map_handle.mapped != NO_MAPPING)
	76	{
	77	void *p = __gr_map_handle.mapped;
	78	__gr_map_handle.mapped = NO_MAPPING;
	79	free (p);
	80	}
c207f23b UD	81	}
	82
	83
d67281a7	84	static int
813f4f4d	85	internal_function
67479a70	86	nscd_getgr_r (const char *key, size_t keylen, request_type type,
a95a08b4	87	struct group resultbuf, char buffer, size_t buflen,
261eada2	88	struct group **result)
d67281a7	89	{
c207f23b	90	int gc_cycle;
1a77d37f	91	int nretries = 0;
0891f970 UD	92	const uint32_t *len = NULL;
0891f970 UD	93	size_t lensize = 0;
c207f23b UD	94
	95	/* If the mapping is available, try to search there instead of
	96	communicating with the nscd. */
	97	struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
ed2ced8a UD	98	&__gr_map_handle,
ed2ced8a UD	99	&gc_cycle);
0891f970	100	retry:;
0891f970 UD	101	const char *gr_name = NULL;
	102	size_t gr_name_len = 0;
	103	int retval = -1;
	104	const char recend = (const char ) ~UINTMAX_C (0);
1a77d37f	105	gr_response_header gr_resp;
0891f970	106
c207f23b	107	if (mapped != NO_MAPPING)
ac16e905	108	{
cfe1fc10 JJ	109	struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
cfe1fc10 JJ	110	sizeof gr_resp);
c207f23b UD	111	if (found != NULL)
c207f23b UD	112	{
1a77d37f JJ	113	len = (const uint32_t *) (&found->data[0].grdata + 1);
1a77d37f JJ	114	gr_resp = found->data[0].grdata;
c207f23b	115	gr_name = ((const char *) len
1a77d37f JJ	116	+ gr_resp.gr_mem_cnt * sizeof (uint32_t));
1a77d37f JJ	117	gr_name_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
c207f23b	118	recend = (const char *) found->data + found->recsize;
1a77d37f JJ	119	/* Now check if we can trust gr_resp fields. If GC is
	120	in progress, it can contain anything. */
	121	if (mapped->head->gc_cycle != gc_cycle)
	122	{
	123	retval = -2;
	124	goto out;
	125	}
	126
	127	/* The alignment is always sufficient, unless GC is in progress. */
	128	assert (((uintptr_t) len & (__alignof__ (*len) - 1)) == 0);
c207f23b UD	129	}
	130	}
	131
c207f23b	132	int sock = -1;
1a77d37f	133	if (gr_name == NULL)
c207f23b	134	{
1a77d37f JJ	135	sock = __nscd_open_socket (key, keylen, type, &gr_resp,
1a77d37f JJ	136	sizeof (gr_resp));
c207f23b UD	137	if (sock == -1)
	138	{
	139	__nss_not_use_nscd_group = 1;
	140	goto out;
	141	}
ac16e905	142	}
d67281a7	143
16aac663 UD	144	/* No value found so far. */
	145	*result = NULL;
	146
1a77d37f	147	if (__builtin_expect (gr_resp.found == -1, 0))
d67281a7	148	{
ac16e905	149	/* The daemon does not cache this database. */
ac16e905	150	__nss_not_use_nscd_group = 1;
c207f23b	151	goto out_close;
d67281a7 UD	152	}
d67281a7 UD	153
1a77d37f	154	if (gr_resp.found == 1)
d67281a7	155	{
40c38b6c	156	struct iovec vec[2];
d67281a7	157	char *p = buffer;
264d5b94 UD	158	size_t total_len;
264d5b94 UD	159	uintptr_t align;
eb64f8cb	160	nscd_ssize_t cnt;
d67281a7	161
67479a70 UD	162	/* Now allocate the buffer the array for the group members. We must
	163	align the pointer. */
	164	align = ((__alignof__ (char ) - (p - ((char ) 0)))
	165	& (__alignof__ (char *) - 1));
1a77d37f JJ	166	total_len = (align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
1a77d37f JJ	167	+ gr_resp.gr_name_len + gr_resp.gr_passwd_len);
12c80513	168	if (__builtin_expect (buflen < total_len, 0))
d67281a7	169	{
67479a70	170	no_room:
d67281a7	171	__set_errno (ERANGE);
261eada2	172	retval = ERANGE;
c207f23b	173	goto out_close;
d67281a7	174	}
bd952512	175	buflen -= total_len;
264d5b94	176
67479a70	177	p += align;
a95a08b4	178	resultbuf->gr_mem = (char **) p;
1a77d37f	179	p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
264d5b94	180
67479a70	181	/* Set pointers for strings. */
a95a08b4	182	resultbuf->gr_name = p;
1a77d37f	183	p += gr_resp.gr_name_len;
a95a08b4	184	resultbuf->gr_passwd = p;
1a77d37f	185	p += gr_resp.gr_passwd_len;
d67281a7	186
67479a70	187	/* Fill in what we know now. */
1a77d37f	188	resultbuf->gr_gid = gr_resp.gr_gid;
264d5b94	189
c207f23b	190	/* Read the length information, group name, and password. */
0891f970	191	if (gr_name == NULL)
c207f23b	192	{
43d3e6bd UD	193	/* Handle a simple, usual case: no group members. */
43d3e6bd UD	194	if (__builtin_expect (gr_resp.gr_mem_cnt == 0, 1))
0891f970	195	{
43d3e6bd UD	196	size_t n = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	197	if (__builtin_expect (__readall (sock, resultbuf->gr_name, n)
	198	!= (ssize_t) n, 0))
	199	goto out_close;
	200	}
	201	else
	202	{
	203	/* Allocate array to store lengths. */
	204	if (lensize == 0)
	205	{
	206	lensize = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	207	len = (uint32_t *) alloca (lensize);
	208	}
	209	else if (gr_resp.gr_mem_cnt * sizeof (uint32_t) > lensize)
	210	len = extend_alloca (len, lensize,
	211	gr_resp.gr_mem_cnt * sizeof (uint32_t));
	212
	213	vec[0].iov_base = (void *) len;
	214	vec[0].iov_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
	215	vec[1].iov_base = resultbuf->gr_name;
	216	vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
	217	total_len = vec[0].iov_len + vec[1].iov_len;
	218
	219	/* Get this data. */
	220	size_t n = __readvall (sock, vec, 2);
	221	if (__builtin_expect (n != total_len, 0))
	222	goto out_close;
0891f970	223	}
c207f23b UD	224	}
	225	else
	226	/* We already have the data. Just copy the group name and
	227	password. */
5429ff76	228	memcpy (resultbuf->gr_name, gr_name,
1a77d37f	229	gr_resp.gr_name_len + gr_resp.gr_passwd_len);
264d5b94	230
67479a70	231	/* Clear the terminating entry. */
1a77d37f	232	resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
d67281a7	233
67479a70 UD	234	/* Prepare reading the group members. */
67479a70 UD	235	total_len = 0;
1a77d37f	236	for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
d67281a7	237	{
a95a08b4	238	resultbuf->gr_mem[cnt] = p;
67479a70 UD	239	total_len += len[cnt];
67479a70 UD	240	p += len[cnt];
d67281a7	241	}
d67281a7	242
c207f23b	243	if (__builtin_expect (gr_name + gr_name_len + total_len > recend, 0))
1a77d37f JJ	244	{
	245	/* len array might contain garbage during nscd GC cycle,
	246	retry rather than fail in that case. */
	247	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	248	retval = -2;
	249	goto out_close;
	250	}
12c80513	251	if (__builtin_expect (total_len > buflen, 0))
1a77d37f JJ	252	{
	253	/* len array might contain garbage during nscd GC cycle,
	254	retry rather than fail in that case. */
	255	if (gr_name != NULL && mapped->head->gc_cycle != gc_cycle)
	256	{
	257	retval = -2;
	258	goto out_close;
	259	}
	260	else
	261	goto no_room;
	262	}
d67281a7	263
a95a08b4	264	retval = 0;
43d3e6bd UD	265
43d3e6bd UD	266	/* If there are no group members TOTAL_LEN is zero. */
fa76dde2	267	if (gr_name == NULL)
d67281a7	268	{
895a08c0 UD	269	if (total_len > 0
	270	&& __builtin_expect (__readall (sock, resultbuf->gr_mem[0],
	271	total_len) != total_len, 0))
c207f23b	272	{
895a08c0 UD	273	/* The `errno' to some value != ERANGE. */
	274	__set_errno (ENOENT);
	275	retval = ENOENT;
c207f23b	276	}
895a08c0 UD	277	else
895a08c0 UD	278	*result = resultbuf;
fa76dde2 UD	279	}
	280	else
	281	{
	282	/* Copy the group member names. */
	283	memcpy (resultbuf->gr_mem[0], gr_name + gr_name_len, total_len);
	284
	285	/* Try to detect corrupt databases. */
	286	if (resultbuf->gr_name[gr_name_len - 1] != '\0'
	287	\|\| resultbuf->gr_passwd[gr_resp.gr_passwd_len - 1] != '\0'
	288	\|\| ({for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
	289	if (resultbuf->gr_mem[cnt][len[cnt] - 1] != '\0')
	290	break;
	291	cnt < gr_resp.gr_mem_cnt; }))
5429ff76	292	{
fa76dde2 UD	293	/* We cannot use the database. */
	294	retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
	295	goto out_close;
5429ff76	296	}
fa76dde2 UD	297
fa76dde2 UD	298	*result = resultbuf;
c207f23b	299	}
14e9dd67 UD	300	}
	301	else
	302	{
cfca0aa3 UD	303	/* Set errno to 0 to indicate no error, just no found record. */
cfca0aa3 UD	304	__set_errno (0);
261eada2 UD	305	/* Even though we have not found anything, the result is zero. */
261eada2 UD	306	retval = 0;
d67281a7	307	}
12c80513	308
c207f23b UD	309	out_close:
	310	if (sock != -1)
	311	close_not_cancel_no_status (sock);
12c80513	312	out:
1a77d37f	313	if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
0891f970 UD	314	{
	315	/* When we come here this means there has been a GC cycle while we
	316	were looking for the data. This means the data might have been
	317	inconsistent. Retry if possible. */
1a77d37f	318	if ((gc_cycle & 1) != 0 \|\| ++nretries == 5 \|\| retval == -1)
0891f970 UD	319	{
0891f970 UD	320	/* nscd is just running gc now. Disable using the mapping. */
1a77d37f JJ	321	if (atomic_decrement_val (&mapped->counter) == 0)
1a77d37f JJ	322	__nscd_unmap (mapped);
0891f970 UD	323	mapped = NO_MAPPING;
	324	}
	325
1a77d37f JJ	326	if (retval != -1)
1a77d37f JJ	327	goto retry;
0891f970	328	}
12c80513	329
261eada2	330	return retval;
d67281a7	331	}