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58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* provide consistent interface to getgroups for systems that don't allow N==0
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Copyright (C) 1996 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* written by Jim Meyering */
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#include <config.h>
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#include <stdio.h>
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#include <sys/types.h>
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char *xmalloc ();
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/* On Ultrix 4.3, getgroups (0, 0) always fails.
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This function handles that special case and lets the system-
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provided function handle all others. */
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int
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getgroups (n, group)
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size_t n;
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GETGROUPS_T *group;
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{
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int ng;
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GETGROUPS_T *gbuf;
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#undef getgroups
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if (n != 0)
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return getgroups (n, group);
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n = 20;
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gbuf = NULL;
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while (1)
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{
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gbuf = (GETGROUPS_T *) xrealloc (gbuf, n * sizeof (GETGROUPS_T));
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ng = getgroups (n, gbuf);
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if (ng < n)
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break;
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n += 10;
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}
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free (gbuf);
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return ng;
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}
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