/* provide consistent interface to getgroups for systems that don't allow N==0
- Copyright (C) 1996, 1999 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1996, 1999, 2003, 2006, 2007, 2008 Free Software
+ Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
+
+#undef getgroups
+
#include <stdio.h>
#include <sys/types.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
-char *xmalloc ();
+#include "xalloc.h"
/* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, 0) always fails.
On other systems, it returns the number of supplemental groups for the
- process is returned.
- This function handles that special case and lets the system-
- provided function handle all others. */
+ process. This function handles that special case and lets the system-
+ provided function handle all others. */
int
-getgroups (size_t n, GETGROUPS_T *group)
+rpl_getgroups (int n, GETGROUPS_T *group)
{
int n_groups;
GETGROUPS_T *gbuf;
-
-#undef getgroups
+ int saved_errno;
if (n != 0)
return getgroups (n, group);
n = 20;
- gbuf = NULL;
while (1)
{
- gbuf = (GETGROUPS_T *) xrealloc (gbuf, n * sizeof (GETGROUPS_T));
+ /* No need to worry about address arithmetic overflow here,
+ since the ancient systems that we're running on have low
+ limits on the number of secondary groups. */
+ gbuf = xmalloc (n * sizeof *gbuf);
n_groups = getgroups (n, gbuf);
if (n_groups < n)
break;
+ free (gbuf);
n += 10;
}
+ saved_errno = errno;
free (gbuf);
+ errno = saved_errno;
return n_groups;
}