Avoid unnecessary setXXent calls into the backend NSS module. If backend setXXent call failed, don't have internal_setXXent fail. Just remember this until it is needed.

1 files changed, 15 insertions, 14 deletions

diff --git a/nis/nss_compat/compat-grp.c b/nis/nss_compat/compat-grp.c
index 093876fd74..f2f7195be1 100644
--- a/nis/nss_compat/compat-grp.c
+++ b/nis/nss_compat/compat-grp.c
@@ -59,12 +59,13 @@ struct blacklist_t
 struct ent_t
 {
   bool_t files;
+  enum nss_status setent_status;
   FILE *stream;
   struct blacklist_t blacklist;
 };
 typedef struct ent_t ent_t;
 
-static ent_t ext_ent = {TRUE, NULL, {NULL, 0, 0}};
+static ent_t ext_ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
 
 /* Protect global state against multiple changers.  */
 __libc_lock_define_initialized (static, lock)
@@ -89,7 +90,7 @@ init_nss_interface (void)
 }
 
 static enum nss_status
-internal_setgrent (ent_t *ent, int stayopen)
+internal_setgrent (ent_t *ent, int stayopen, int needent)
 {
   enum nss_status status = NSS_STATUS_SUCCESS;
 
@@ -137,12 +138,8 @@ internal_setgrent (ent_t *ent, int stayopen)
   else
     rewind (ent->stream);
 
-  if (status == NSS_STATUS_SUCCESS && nss_setgrent)
-    {
-      status = nss_setgrent (stayopen);
-      if (status == NSS_STATUS_UNAVAIL)
-        status = NSS_STATUS_SUCCESS;
-    }
+  if (needent && status == NSS_STATUS_SUCCESS && nss_setgrent)
+    ent->setent_status = nss_setgrent (stayopen);
 
   return status;
 }
@@ -158,7 +155,7 @@ _nss_compat_setgrent (int stayopen)
   if (ni == NULL)
     init_nss_interface ();
 
-  result = internal_setgrent (&ext_ent, stayopen);
+  result = internal_setgrent (&ext_ent, stayopen, 1);
 
   __libc_lock_unlock (lock);
 
@@ -212,6 +209,10 @@ getgrent_next_nss (struct group *result, ent_t *ent, char *buffer,
   if (!nss_getgrent_r)
     return NSS_STATUS_UNAVAIL;
 
+  /* If the setgrent call failed, say so.  */
+  if (ent->setent_status != NSS_STATUS_SUCCESS)
+    return ent->setent_status;
+
   do
     {
       enum nss_status status;
@@ -363,7 +364,7 @@ _nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen,
     init_nss_interface ();
 
   if (ext_ent.stream == NULL)
-    result = internal_setgrent (&ext_ent, 1);
+    result = internal_setgrent (&ext_ent, 1, 1);
 
   if (result == NSS_STATUS_SUCCESS)
     {
@@ -485,7 +486,7 @@ enum nss_status
 _nss_compat_getgrnam_r (const char *name, struct group *grp,
 			char *buffer, size_t buflen, int *errnop)
 {
-  ent_t ent = {TRUE, NULL, {NULL, 0, 0}};
+  ent_t ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
   enum nss_status result;
 
   if (name[0] == '-' || name[0] == '+')
@@ -498,7 +499,7 @@ _nss_compat_getgrnam_r (const char *name, struct group *grp,
 
   __libc_lock_unlock (lock);
 
-  result = internal_setgrent (&ent, 0);
+  result = internal_setgrent (&ent, 0, 0);
 
   if (result == NSS_STATUS_SUCCESS)
     result = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);
@@ -613,7 +614,7 @@ enum nss_status
 _nss_compat_getgrgid_r (gid_t gid, struct group *grp,
 			char *buffer, size_t buflen, int *errnop)
 {
-  ent_t ent = {TRUE, NULL, {NULL, 0, 0}};
+  ent_t ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
   enum nss_status result;
 
   __libc_lock_lock (lock);
@@ -623,7 +624,7 @@ _nss_compat_getgrgid_r (gid_t gid, struct group *grp,
 
   __libc_lock_unlock (lock);
 
-  result = internal_setgrent (&ent, 0);
+  result = internal_setgrent (&ent, 0, 0);
 
   if (result == NSS_STATUS_SUCCESS)
     result = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);