/* provide consistent interface to getgroups for systems that don't allow N==0
- Copyright (C) 1996, 1999, 2003 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1996, 1999, 2003, 2006, 2007, 2008, 2009 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>
-#include <stdio.h>
-#include <sys/types.h>
+
+#include <unistd.h>
+
#include <errno.h>
#include <stdlib.h>
-#include "xalloc.h"
+#if !HAVE_GETGROUPS
-/* 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. This function handles that special case and lets the system-
- provided function handle all others. */
+/* Provide a stub that fails with ENOSYS, since there is no group
+ information available on mingw. */
+int
+getgroups (int n _UNUSED_PARAMETER_, GETGROUPS_T *groups _UNUSED_PARAMETER_)
+{
+ errno = ENOSYS;
+ return -1;
+}
+
+#else /* HAVE_GETGROUPS */
+
+# undef getgroups
+
+/* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, NULL) always
+ fails. On other systems, it returns the number of supplemental
+ groups for the process. This function handles that special case
+ and lets the system-provided function handle all others. However,
+ it can fail with ENOMEM if memory is tight. It is unspecified
+ whether the effective group id is included in the list. */
int
-getgroups (int n, GETGROUPS_T *group)
+rpl_getgroups (int n, GETGROUPS_T *group)
{
int n_groups;
GETGROUPS_T *gbuf;
int saved_errno;
-#undef getgroups
-
if (n != 0)
return getgroups (n, group);
while (1)
{
/* 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);
+ since the ancient systems that we're running on have low
+ limits on the number of secondary groups. */
+ gbuf = malloc (n * sizeof *gbuf);
+ if (!gbuf)
+ return -1;
n_groups = getgroups (n, gbuf);
- if (n_groups < n)
- break;
+ if (n_groups == -1 ? errno != EINVAL : n_groups < n)
+ break;
free (gbuf);
- n += 10;
+ n *= 2;
}
saved_errno = errno;
return n_groups;
}
+
+#endif /* HAVE_GETGROUPS */