1 files changed, 50 insertions, 0 deletions
diff --git a/grp/getgrgid.c b/grp/getgrgid.c
new file mode 100644
index 0000000000..1375f5ff56
--- /dev/null
+++ b/grp/getgrgid.c
@@ -0,0 +1,50 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <grp.h>
+
+/* Search for an entry with a matching group ID.  */
+struct group *
+DEFUN(getgrgid, (gid), register gid_t gid)
+{
+  static PTR info = NULL;
+  register FILE *stream;
+  register struct group *g;
+
+  if (info == NULL)
+    {
+      info = __grpalloc();
+      if (info == NULL)
+	return NULL;
+    }
+
+  stream = __grpopen();
+  if (stream == NULL)
+    return NULL;
+
+  while ((g = __grpread(stream, info)) != NULL)
+    if (g->gr_gid == (gid_t) gid)
+      break;
+
+  (void) fclose(stream);
+  return g;
+}