1 files changed, 60 insertions, 0 deletions
diff --git a/include/nss_files.h b/include/nss_files.h
index 6a0dcdb85b..7bf1951496 100644
--- a/include/nss_files.h
+++ b/include/nss_files.h
@@ -20,6 +20,9 @@
 #define _NSS_FILES_H
 
 #include <stdio.h>
+#if IS_IN (libc)
+#include <libc-lock.h>
+#endif
 
 /* Open PATH for reading, as a data source for nss_files.  */
 FILE *__nss_files_fopen (const char *path);
@@ -47,6 +50,63 @@ int __nss_readline_seek (FILE *fp, off64_t offset) attribute_hidden;
 int __nss_parse_line_result (FILE *fp, off64_t offset, int parse_line_result);
 libc_hidden_proto (__nss_parse_line_result)
 
+/* Per-file data.  Used by the *ent functions that need to preserve
+   state across calls.  */
+struct nss_files_per_file_data
+{
+  FILE *stream;
+#if IS_IN (libc)
+  /* The size of locks changes between libc and nss_files, so this
+     member must be last and is only available in libc.  */
+  __libc_lock_define (, lock);
+#endif
+};
+
+/* File index for __nss_files_data_get.  */
+enum nss_files_file
+  {
+    nss_file_aliasent,
+    nss_file_etherent,
+    nss_file_grent,
+    nss_file_hostent,
+    nss_file_netent,
+    nss_file_protoent,
+    nss_file_pwent,
+    nss_file_rpcent,
+    nss_file_servent,
+    nss_file_sgent,
+    nss_file_spent,
+
+    nss_file_count
+  };
+
+/* Obtains a pointer to the per-file data for FILE, which is written
+   to *PDATA, and tries to open the file at PATH for it.  On success,
+   returns NSS_STATUS_SUCCESS, and the caller must later call
+   __nss_files_data_put.  On failure, NSS_STATUS_TRYAGAIN is returned,
+   and *ERRNOP and *HERRNOP are updated if these pointers are not
+   null.  */
+enum nss_status __nss_files_data_open (struct nss_files_per_file_data **pdata,
+                                       enum nss_files_file file,
+                                       const char *path,
+                                       int *errnop, int *herrnop);
+libc_hidden_proto (__nss_files_data_open)
+
+/* Unlock the per-file data, previously obtained by
+   __nss_files_data_open.  */
+void __nss_files_data_put (struct nss_files_per_file_data *data);
+libc_hidden_proto (__nss_files_data_put)
+
+/* Performs the set*ent operation for FILE.  PATH is the file to
+   open.  */
+enum nss_status __nss_files_data_setent (enum nss_files_file file,
+                                           const char *path);
+libc_hidden_proto (__nss_files_data_setent)
+
+/* Performs the end*ent operation for FILE.  */
+enum nss_status __nss_files_data_endent (enum nss_files_file file);
+libc_hidden_proto (__nss_files_data_endent)
+
 struct parser_data;
 
 /* Instances of the parse_line function from