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annotate lib/getgroups.c @ 1732:16c93d56c8f6

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fix typo in comment.
author Jim Meyering <jim@meyering.net>
date Tue, 09 Mar 1999 18:53:54 +0000
parents 03d2d4430bf2
children 5994c6f939c5
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1 /* provide consistent interface to getgroups for systems that don't allow N==0
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2 Copyright (C) 1996, 1999 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 /* written by Jim Meyering */
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19
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20 #include <config.h>
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21 #include <stdio.h>
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22 #include <sys/types.h>
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23
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24 char *xmalloc ();
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25
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26 /* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, 0) always fails.
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27 On other systems, it returns the number of supplemental groups for the
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28 process. This function handles that special case and lets the system-
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29 provided function handle all others. */
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30
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31 int
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32 getgroups (size_t n, GETGROUPS_T *group)
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33 {
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34 int n_groups;
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35 GETGROUPS_T *gbuf;
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36
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37 #undef getgroups
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38
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39 if (n != 0)
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40 return getgroups (n, group);
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41
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42 n = 20;
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43 gbuf = NULL;
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44 while (1)
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45 {
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46 gbuf = (GETGROUPS_T *) xrealloc (gbuf, n * sizeof (GETGROUPS_T));
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47 n_groups = getgroups (n, gbuf);
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48 if (n_groups < n)
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49 break;
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50 n += 10;
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51 }
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52
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53 free (gbuf);
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54
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55 return n_groups;
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56 }