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authorUlrich Drepper <drepper@redhat.com>2004-08-14 04:21:09 +0000
committerUlrich Drepper <drepper@redhat.com>2004-08-14 04:21:09 +0000
commit8500b0cabadf7500bdccdf6b94ad3f36bf7a96c9 (patch)
tree5c5eb63f6fa5ee9448988b2a231a8cf8d0608184
parenta57532064137c37543e7e8861a8931444a21157c (diff)
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Update.
* nis/nss_nis/nis-netgrp.c: Remove locking by using data in struct __netgrent object passed in instead of global variables. Optimize. * nis/nss_nisplus/nisplus-netgrp.c: Remove locking by using data in struct __netgrent object passed in instead of global variables. * inet/netgroup.h (struct __netgrent): Add service_user field. Move cursor in anonymous union, add new field location to that union. * inet/getnetgrent_r.c: Extensive rewrite to really enable concurrent uset of set/get/endnetgrent and innetgr.
-rw-r--r--ChangeLog13
-rw-r--r--inet/getnetgrent_r.c96
-rw-r--r--inet/netgroup.h12
-rw-r--r--nis/nss_nis/nis-netgrp.c86
-rw-r--r--nis/nss_nisplus/nisplus-netgrp.c140
5 files changed, 152 insertions, 195 deletions
diff --git a/ChangeLog b/ChangeLog
index 828a4765e0..f809ef8c1e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,15 @@
2004-08-13 Ulrich Drepper <drepper@redhat.com>
- * inet/getnetgrent_r.c (innetgr): We must get the lock used for
- the set/get/end interfaces since we call all these functions in
- succession and must not be interrupted doing this.
+ * nis/nss_nis/nis-netgrp.c: Remove locking by using data in struct
+ __netgrent object passed in instead of global variables.
+ Optimize.
+ * nis/nss_nisplus/nisplus-netgrp.c: Remove locking by using data
+ in struct __netgrent object passed in instead of global variables.
+ * inet/netgroup.h (struct __netgrent): Add service_user field.
+ Move cursor in anonymous union, add new field location to that
+ union.
+ * inet/getnetgrent_r.c: Extensive rewrite to really enable
+ concurrent uset of set/get/endnetgrent and innetgr.
Reported by Chuck Simmons.
* inet/netgroup.h (struct name_list): Replace name pointer with
diff --git a/inet/getnetgrent_r.c b/inet/getnetgrent_r.c
index 87853981cd..640210ab2e 100644
--- a/inet/getnetgrent_r.c
+++ b/inet/getnetgrent_r.c
@@ -28,10 +28,6 @@
/* Protect above variable against multiple uses at the same time. */
__libc_lock_define_initialized (static, lock)
-/* This handle for the NSS data base is shared between all
- set/get/endXXXent functions. */
-static service_user *nip;
-
/* The whole information for the set/get/endnetgrent functions are
kept in this structure. */
static struct __netgrent dataset;
@@ -45,7 +41,7 @@ extern int __nss_netgroup_lookup (service_user **nip, const char *name,
current location if it's not nil. Return nonzero if there are no
services (left). */
static enum nss_status
-setup (void **fctp, const char *func_name, int all)
+setup (void **fctp, const char *func_name, int all, service_user **nipp)
{
/* Remember the first service_entry, it's always the same. */
static service_user *startp;
@@ -53,19 +49,21 @@ setup (void **fctp, const char *func_name, int all)
if (startp == NULL)
{
- no_more = __nss_netgroup_lookup (&nip, func_name, fctp);
- startp = no_more ? (service_user *) -1 : nip;
+ /* Executing this more than once at the same time must yield the
+ same result every time. So we need no locking. */
+ no_more = __nss_netgroup_lookup (nipp, func_name, fctp);
+ startp = no_more ? (service_user *) -1 : *nipp;
}
else if (startp == (service_user *) -1)
/* No services at all. */
return 1;
else
{
- if (all || !nip)
+ if (all || *nipp == NULL)
/* Reset to the beginning of the service list. */
- nip = startp;
+ *nipp = startp;
/* Look up the first function. */
- no_more = __nss_lookup (&nip, func_name, fctp);
+ no_more = __nss_lookup (nipp, func_name, fctp);
}
return no_more;
}
@@ -101,16 +99,15 @@ __internal_setnetgrent_reuse (const char *group, struct __netgrent *datap,
} fct;
enum nss_status status = NSS_STATUS_UNAVAIL;
struct name_list *new_elem;
- int no_more;
/* Cycle through all the services and run their setnetgrent functions. */
- no_more = setup (&fct.ptr, "setnetgrent", 1);
+ int no_more = setup (&fct.ptr, "setnetgrent", 1, &datap->nip);
while (! no_more)
{
/* Ignore status, we force check in `__nss_next'. */
status = (*fct.f) (group, datap);
- no_more = __nss_next (&nip, "setnetgrent", &fct.ptr, status, 0);
+ no_more = __nss_next (&datap->nip, "setnetgrent", &fct.ptr, status, 0);
}
/* Add the current group to the list of known groups. */
@@ -173,20 +170,19 @@ internal_endnetgrent (struct __netgrent *datap)
enum nss_status (*f) (struct __netgrent *);
void *ptr;
} fct;
- int no_more;
/* Remember which was the last used service. */
- old_nip = nip;
+ old_nip = datap->nip;
/* Cycle through all the services and run their endnetgrent functions. */
- no_more = setup (&fct.ptr, "endnetgrent", 1);
+ int no_more = setup (&fct.ptr, "endnetgrent", 1, &datap->nip);
while (! no_more)
{
/* Ignore status, we force check in `__nss_next'. */
(void) (*fct.f) (datap);
- no_more = (nip == old_nip
- || __nss_next (&nip, "endnetgrent", &fct.ptr, 0, 1));
+ no_more = (datap->nip == old_nip
+ || __nss_next (&datap->nip, "endnetgrent", &fct.ptr, 0, 1));
}
/* Now free list of all netgroup names from last run. */
@@ -222,7 +218,6 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
enum nss_status (*f) (struct __netgrent *, char *, size_t, int *);
void *ptr;
} fct;
- int no_more;
/* Initialize status to return if no more functions are found. */
enum nss_status status = NSS_STATUS_NOTFOUND;
@@ -230,7 +225,7 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
/* Run through available functions, starting with the same function last
run. We will repeat each function as long as it succeeds, and then go
on to the next service action. */
- no_more = setup (&fct.ptr, "getnetgrent_r", 0);
+ int no_more = setup (&fct.ptr, "getnetgrent_r", 0, &datap->nip);
while (! no_more)
{
status = (*fct.f) (datap, buffer, buflen, &errno);
@@ -284,7 +279,7 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
}
}
- no_more = __nss_next (&nip, "getnetgrent_r", &fct.ptr, status, 0);
+ no_more = __nss_next (&datap->nip, "getnetgrent_r", &fct.ptr, status, 0);
}
if (status == NSS_STATUS_SUCCESS)
@@ -337,14 +332,12 @@ innetgr (const char *netgroup, const char *host, const char *user,
int (*f) (struct __netgrent *, char *, size_t, int *);
void *ptr;
} getfct;
- struct name_list *known = NULL;
- struct name_list *needed = NULL;
+ struct __netgrent entry;
int result = 0;
- int no_more;
const char *current_group = netgroup;
int real_entry = 0;
- __libc_lock_lock (lock);
+ memset (&entry, '\0', sizeof (entry));
/* Walk through the services until we found an answer or we shall
not work further. We can do some optimization here. Since all
@@ -352,19 +345,14 @@ innetgr (const char *netgroup, const char *host, const char *user,
the work during one walk through the service list. */
while (1)
{
- no_more = setup (&setfct.ptr, "setnetgrent", 1);
+ int no_more = setup (&setfct.ptr, "setnetgrent", 1, &entry.nip);
while (! no_more)
{
- enum nss_status status;
- struct __netgrent entry;
-
- /* Clear the space for the netgroup data. */
- __bzero (&entry, sizeof (entry));
-
/* Open netgroup. */
- status = (*setfct.f) (current_group, &entry);
+ enum nss_status status = (*setfct.f) (current_group, &entry);
+
if (status == NSS_STATUS_SUCCESS
- && __nss_lookup (&nip, "getnetgrent_r", &getfct.ptr) == 0)
+ && __nss_lookup (&entry.nip, "getnetgrent_r", &getfct.ptr) == 0)
{
char buffer[1024];
@@ -376,7 +364,8 @@ innetgr (const char *netgroup, const char *host, const char *user,
/* Make sure we haven't seen the name before. */
struct name_list *namep;
- for (namep = known; namep != NULL; namep = namep->next)
+ for (namep = entry.known_groups; namep != NULL;
+ namep = namep->next)
if (strcmp (entry.val.group, namep->name) == 0)
break;
if (namep == NULL
@@ -393,9 +382,9 @@ innetgr (const char *netgroup, const char *host, const char *user,
break;
}
- namep->next = needed;
+ namep->next = entry.needed_groups;
memcpy (namep->name, entry.val.group, group_len);
- needed = namep;
+ entry.needed_groups = namep;
}
}
else
@@ -425,21 +414,21 @@ innetgr (const char *netgroup, const char *host, const char *user,
}
/* Free all resources of the service. */
- if (__nss_lookup (&nip, "endnetgrent", &endfct.ptr) == 0)
+ if (__nss_lookup (&entry.nip, "endnetgrent", &endfct.ptr) == 0)
(*endfct.f) (&entry);
/* Look for the next service. */
- no_more = __nss_next (&nip, "setnetgrent",
+ no_more = __nss_next (&entry.nip, "setnetgrent",
&setfct.ptr, status, 0);
}
- if (result == 0 && needed != NULL)
+ if (result == 0 && entry.needed_groups != NULL)
{
- struct name_list *tmp = needed;
- needed = tmp->next;
- tmp->next = known;
- known = tmp;
- current_group = known->name;
+ struct name_list *tmp = entry.needed_groups;
+ entry.needed_groups = tmp->next;
+ tmp->next = entry.known_groups;
+ entry.known_groups = tmp;
+ current_group = entry.known_groups->name;
continue;
}
@@ -447,22 +436,9 @@ innetgr (const char *netgroup, const char *host, const char *user,
break;
}
- __libc_lock_unlock (lock);
-
/* Free the memory. */
- while (known != NULL)
- {
- struct name_list *tmp = known;
- known = known->next;
- free (tmp);
- }
- while (needed != NULL)
- {
- struct name_list *tmp = needed;
- needed = needed->next;
- free (tmp);
- }
+ free_memory (&entry);
- return result == 1;
+ return result;
}
libc_hidden_def (innetgr)
diff --git a/inet/netgroup.h b/inet/netgroup.h
index aea52188d9..c6b77ba520 100644
--- a/inet/netgroup.h
+++ b/inet/netgroup.h
@@ -20,6 +20,8 @@
#ifndef _NETGROUP_H
#define _NETGROUP_H 1
+#include <nsswitch.h>
+
/* A netgroup can consist of names of other netgroups. We have to
track which netgroups were read and which still have to be read. */
struct name_list
@@ -51,11 +53,19 @@ struct __netgrent
functions. We must avoid global variables. */
char *data;
size_t data_size;
- char *cursor;
+ union
+ {
+ char *cursor;
+ unsigned long int position;
+ };
int first;
struct name_list *known_groups;
struct name_list *needed_groups;
+
+ /* This handle for the NSS data base is shared between all
+ set/get/endXXXent functions. */
+ service_user *nip;
};
diff --git a/nis/nss_nis/nis-netgrp.c b/nis/nss_nis/nis-netgrp.c
index e9318d6e95..d339dd5097 100644
--- a/nis/nss_nis/nis-netgrp.c
+++ b/nis/nss_nis/nis-netgrp.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996,1997,1999,2000,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1996,1997,1999,2000,2002,2003,2004
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
@@ -17,11 +18,12 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
-#include <nss.h>
+#include <assert.h>
#include <ctype.h>
#include <errno.h>
-#include <bits/libc-lock.h>
+#include <malloc.h>
#include <netdb.h>
+#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -31,36 +33,28 @@
#include "nss-nis.h"
-/* Locks the static variables in this file. */
-__libc_lock_define_initialized (static, lock)
-
-static char *data;
-static size_t data_size;
-static char *cursor;
-
extern enum nss_status
-_nss_netgroup_parseline (char **cursor, struct __netgrent *result,
+_nss_netgroup_parseline (char **cursor, struct __netgrent *netgrp,
char *buffer, size_t buflen, int *errnop);
static void
-internal_nis_endnetgrent (void)
+internal_nis_endnetgrent (struct __netgrent *netgrp)
{
- if (data != NULL)
+ if (netgrp->data != NULL)
{
- free (data);
- data = NULL;
- data_size = 0;
- cursor = NULL;
+ free (netgrp->data);
+ netgrp->data = NULL;
+ netgrp->data_size = 0;
+ netgrp->cursor = NULL;
}
}
enum nss_status
-_nss_nis_setnetgrent (const char *group, struct __netgrent *dummy)
+_nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
{
char *domain;
- char *result;
- int len, group_len;
+ int len;
enum nss_status status;
status = NSS_STATUS_SUCCESS;
@@ -71,41 +65,32 @@ _nss_nis_setnetgrent (const char *group, struct __netgrent *dummy)
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
- __libc_lock_lock (lock);
+ internal_nis_endnetgrent (netgrp);
- internal_nis_endnetgrent ();
-
- group_len = strlen (group);
-
- status = yperr2nss (yp_match (domain, "netgroup", group, group_len,
- &result, &len));
+ status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
+ &netgrp->data, &len));
if (status == NSS_STATUS_SUCCESS)
{
- if (len > 0 && (data = malloc (len + 1)) != NULL)
- {
- data_size = len;
- cursor = strncpy (data, result, len + 1);
- data[len] = '\0';
- free (result);
- }
- else
- status = NSS_STATUS_NOTFOUND;
+ /* Our implementation of yp_match already allocates a buffer
+ which is one byte larger than the value in LEN specifies
+ and the last byte is filled with NUL. So we can simply
+ use that buffer. */
+ assert (len > 0);
+ assert (malloc_usable_size (netgrp->data) >= len + 1);
+ assert (netgrp->data[len] == '\0');
+
+ netgrp->data_size = len;
+ netgrp->cursor = netgrp->data;
}
- __libc_lock_unlock (lock);
-
return status;
}
enum nss_status
-_nss_nis_endnetgrent (struct __netgrent *dummy)
+_nss_nis_endnetgrent (struct __netgrent *netgrp)
{
- __libc_lock_lock (lock);
-
- internal_nis_endnetgrent ();
-
- __libc_lock_unlock (lock);
+ internal_nis_endnetgrent (netgrp);
return NSS_STATUS_SUCCESS;
}
@@ -114,16 +99,9 @@ enum nss_status
_nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
int *errnop)
{
- enum nss_status status;
-
- if (cursor == NULL)
+ if (result->cursor == NULL)
return NSS_STATUS_NOTFOUND;
- __libc_lock_lock (lock);
-
- status = _nss_netgroup_parseline (&cursor, result, buffer, buflen, errnop);
-
- __libc_lock_unlock (lock);
-
- return status;
+ return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
+ errnop);
}
diff --git a/nis/nss_nisplus/nisplus-netgrp.c b/nis/nss_nisplus/nisplus-netgrp.c
index 2d5ddf084e..c56a6854a4 100644
--- a/nis/nss_nisplus/nisplus-netgrp.c
+++ b/nis/nss_nisplus/nisplus-netgrp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
@@ -23,51 +23,47 @@
#include <netdb.h>
#include <string.h>
#include <netgroup.h>
-#include <bits/libc-lock.h>
#include <rpcsvc/nis.h>
#include "nss-nisplus.h"
-__libc_lock_define_initialized (static, lock)
-
-static nis_result *data = NULL;
-static unsigned long data_size = 0;
-static unsigned long position = 0;
-
#define NISENTRYVAL(idx,col,res) \
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
#define NISENTRYLEN(idx,col,res) \
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
-static enum nss_status
-_nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
- size_t buflen, int *errnop)
+enum nss_status
+_nss_nisplus_getnetgrent_r (struct __netgrent *result, char *buffer,
+ size_t buflen, int *errnop)
{
enum nss_status status;
/* Some sanity checks. */
- if (data == NULL || data_size == 0)
+ if (result->data == NULL || result->data_size == 0)
return NSS_STATUS_NOTFOUND;
- if (position == data_size)
+ if (result->position == result->data_size)
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
- if (NISENTRYLEN (position, 1, data) > 0)
+ unsigned int entrylen
+ = NISENTRYLEN (result->position, 1, (nis_result *) result->data);
+ if (entrylen > 0)
{
/* We have a list of other netgroups. */
result->type = group_val;
- if (NISENTRYLEN (position, 1, data) >= buflen)
+ if (entrylen >= buflen)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
- strncpy (buffer, NISENTRYVAL (position, 1, data),
- NISENTRYLEN (position, 1, data));
- buffer[NISENTRYLEN (position, 1, data)] = '\0';
+ strncpy (buffer, NISENTRYVAL (result->position, 1,
+ (nis_result *) result->data),
+ entrylen);
+ buffer[entrylen] = '\0';
result->val.group = buffer;
- ++position;
+ ++result->position;
result->first = 0;
return NSS_STATUS_SUCCESS;
@@ -75,8 +71,13 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
/* Before we can copy the entry to the private buffer we have to make
sure it is big enough. */
- if (NISENTRYLEN (position, 2, data) + NISENTRYLEN (position, 3, data) +
- NISENTRYLEN (position, 4, data) + 6 > buflen)
+ unsigned int hostlen
+ = NISENTRYLEN (result->position, 2, (nis_result *) result->data);
+ unsigned int userlen
+ = NISENTRYLEN (result->position, 3, (nis_result *) result->data);
+ unsigned int domainlen
+ = NISENTRYLEN (result->position, 4, (nis_result *) result->data);
+ if (hostlen + userlen + domainlen + 6 > buflen)
{
*errnop = ERANGE;
status = NSS_STATUS_TRYAGAIN;
@@ -87,40 +88,43 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
result->type = triple_val;
- if (NISENTRYLEN (position, 2, data) == 0)
+ if (hostlen == 0)
result->val.triple.host = NULL;
else
{
result->val.triple.host = cp;
- cp = __stpncpy (cp, NISENTRYVAL (position, 2, data),
- NISENTRYLEN (position, 2, data));
+ cp = __stpncpy (cp, NISENTRYVAL (result->position, 2,
+ (nis_result *) result->data),
+ hostlen);
*cp++ = '\0';
}
- if (NISENTRYLEN (position, 3, data) == 0)
+ if (userlen == 0)
result->val.triple.user = NULL;
else
{
result->val.triple.user = cp;
- cp = __stpncpy (cp, NISENTRYVAL (position, 3, data),
- NISENTRYLEN (position, 3, data));
+ cp = __stpncpy (cp, NISENTRYVAL (result->position, 3,
+ (nis_result *) result->data),
+ userlen);
*cp++ = '\0';
}
- if (NISENTRYLEN (position, 4, data) == 0)
+ if (domainlen == 0)
result->val.triple.domain = NULL;
else
{
result->val.triple.domain = cp;
- cp = __stpncpy (cp, NISENTRYVAL (position, 4, data),
- NISENTRYLEN (position, 4, data));
+ cp = __stpncpy (cp, NISENTRYVAL (result->position, 4,
+ (nis_result *) result->data),
+ domainlen);
*cp = '\0';
}
status = NSS_STATUS_SUCCESS;
/* Remember where we stopped reading. */
- ++position;
+ ++result->position;
result->first = 0;
}
@@ -128,8 +132,20 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
return status;
}
+static void
+internal_endnetgrent (struct __netgrent *netgrp)
+{
+ if (netgrp->data != NULL)
+ {
+ nis_freeresult ((nis_result *) netgrp->data);
+ netgrp->data = NULL;
+ netgrp->data_size = 0;
+ netgrp->position = 0;
+ }
+}
+
enum nss_status
-_nss_nisplus_setnetgrent (const char *group, struct __netgrent *dummy)
+_nss_nisplus_setnetgrent (const char *group, struct __netgrent *netgrp)
{
enum nss_status status;
char buf[strlen (group) + 30];
@@ -139,68 +155,38 @@ _nss_nisplus_setnetgrent (const char *group, struct __netgrent *dummy)
status = NSS_STATUS_SUCCESS;
- __libc_lock_lock (lock);
-
- if (data != NULL)
- {
- nis_freeresult (data);
- data = NULL;
- data_size = 0;
- position = 0;
- }
+ internal_endnetgrent (netgrp);
sprintf (buf, "[name=%s],netgroup.org_dir", group);
- data = nis_list (buf, EXPAND_NAME, NULL, NULL);
+ netgrp->data = (char *) nis_list (buf, EXPAND_NAME, NULL, NULL);
- if (data == NULL)
+ if (netgrp->data == NULL)
{
__set_errno (ENOMEM);
status = NSS_STATUS_TRYAGAIN;
}
- else if (niserr2nss (data->status) != NSS_STATUS_SUCCESS)
+ else if (niserr2nss (((nis_result *) netgrp->data)->status)
+ != NSS_STATUS_SUCCESS)
{
- status = niserr2nss (data->status);
- nis_freeresult (data);
- data = NULL;
+ status = niserr2nss (((nis_result *) netgrp->data)->status);
+
+ internal_endnetgrent (netgrp);
}
else
- data_size = data->objects.objects_len;
-
- __libc_lock_unlock (lock);
-
- return status;
-}
-
-enum nss_status
-_nss_nisplus_endnetgrent (struct __netgrent *dummy)
-{
- __libc_lock_lock (lock);
-
- if (data != NULL)
{
- nis_freeresult (data);
- data = NULL;
- data_size = 0;
- position = 0;
+ netgrp->data_size = ((nis_result *) netgrp->data)->objects.objects_len;
+ netgrp->position = 0;
+ netgrp->first = 1;
}
- __libc_lock_unlock (lock);
-
- return NSS_STATUS_SUCCESS;
+ return status;
}
enum nss_status
-_nss_nisplus_getnetgrent_r (struct __netgrent *result,
- char *buffer, size_t buflen, int *errnop)
+_nss_nisplus_endnetgrent (struct __netgrent *netgrp)
{
- enum nss_status status;
-
- __libc_lock_lock (lock);
-
- status = _nss_nisplus_parse_netgroup (result, buffer, buflen, errnop);
+ internal_endnetgrent (netgrp);
- __libc_lock_unlock (lock);
-
- return status;
+ return NSS_STATUS_SUCCESS;
}