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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 /inet
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.
Diffstat (limited to 'inet')
-rw-r--r--inet/getnetgrent_r.c96
-rw-r--r--inet/netgroup.h12
2 files changed, 47 insertions, 61 deletions
diff --git a/inet/getnetgrent_r.c b/inet/getnetgrent_r.c
index 8785398..640210a 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 aea5218..c6b77ba 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;
};