/* provide consistent interface to getgroups for systems that don't allow N==0
- Copyright (C) 1996, 1999, 2003, 2006, 2007, 2008, 2009 Free
- Software Foundation, Inc.
+ Copyright (C) 1996, 1999, 2003, 2006-2010 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
/* 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_)
+getgroups (int n _GL_UNUSED, GETGROUPS_T *groups _GL_UNUSED)
{
errno = ENOSYS;
return -1;
#else /* HAVE_GETGROUPS */
# undef getgroups
+# ifndef GETGROUPS_ZERO_BUG
+# define GETGROUPS_ZERO_BUG 0
+# endif
/* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, NULL) always
fails. On other systems, it returns the number of supplemental
whether the effective group id is included in the list. */
int
-rpl_getgroups (int n, GETGROUPS_T *group)
+rpl_getgroups (int n, gid_t *group)
{
int n_groups;
GETGROUPS_T *gbuf;
int saved_errno;
- if (n != 0)
- return getgroups (n, group);
+ if (n < 0)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (n != 0 || !GETGROUPS_ZERO_BUG)
+ {
+ int result;
+ if (sizeof *group == sizeof *gbuf)
+ return getgroups (n, (GETGROUPS_T *) group);
+
+ if (SIZE_MAX / sizeof *gbuf <= n)
+ {
+ errno = ENOMEM;
+ return -1;
+ }
+ gbuf = malloc (n * sizeof *gbuf);
+ if (!gbuf)
+ return -1;
+ result = getgroups (n, gbuf);
+ if (0 <= result)
+ {
+ n = result;
+ while (n--)
+ group[n] = gbuf[n];
+ }
+ saved_errno = errno;
+ free (gbuf);
+ errno == saved_errno;
+ return result;
+ }
n = 20;
while (1)