Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/getgroups.c @ 4795:ac6111c4f643
Include <errno.h>, <stdlib.h>.
(getgroups): First arg is int, not size_t.
Don't let 'free' mangle errno.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Thu, 16 Oct 2003 07:30:56 +0000 |
| parents | 66dca1409f3e |
| children | b3e190d8e109 |
| rev | line source |
|---|---|
| 818 | 1 /* provide consistent interface to getgroups for systems that don't allow N==0 |
|
4504
66dca1409f3e
Include "xalloc.h" instead of declaring xalloc fns; from Dmitry V. Levin.
Paul Eggert <eggert@cs.ucla.edu>
parents:
2807
diff
changeset
|
2 Copyright (C) 1996, 1999, 2003 Free Software Foundation, Inc. |
| 818 | 3 |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program; if not, write to the Free Software Foundation, | |
| 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 17 | |
| 18 /* written by Jim Meyering */ | |
| 19 | |
| 20 #include <config.h> | |
| 21 #include <stdio.h> | |
| 22 #include <sys/types.h> | |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
23 #include <errno.h> |
|
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
24 #include <stdlib.h> |
| 818 | 25 |
|
4504
66dca1409f3e
Include "xalloc.h" instead of declaring xalloc fns; from Dmitry V. Levin.
Paul Eggert <eggert@cs.ucla.edu>
parents:
2807
diff
changeset
|
26 #include "xalloc.h" |
| 818 | 27 |
| 834 | 28 /* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, 0) always fails. |
| 29 On other systems, it returns the number of supplemental groups for the | |
| 1732 | 30 process. This function handles that special case and lets the system- |
| 31 provided function handle all others. */ | |
| 818 | 32 |
| 33 int | |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
34 getgroups (int n, GETGROUPS_T *group) |
| 818 | 35 { |
| 834 | 36 int n_groups; |
| 818 | 37 GETGROUPS_T *gbuf; |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
38 int saved_errno; |
| 818 | 39 |
| 40 #undef getgroups | |
| 41 | |
| 42 if (n != 0) | |
| 43 return getgroups (n, group); | |
| 44 | |
| 45 n = 20; | |
| 46 gbuf = NULL; | |
| 47 while (1) | |
| 48 { | |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
49 /* No need to worry about address arithmetic overflow here, |
|
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
50 since the ancient systems that we're running on have low |
|
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
51 limits on the number of secondary groups. */ |
|
4504
66dca1409f3e
Include "xalloc.h" instead of declaring xalloc fns; from Dmitry V. Levin.
Paul Eggert <eggert@cs.ucla.edu>
parents:
2807
diff
changeset
|
52 gbuf = xrealloc (gbuf, n * sizeof (GETGROUPS_T)); |
| 834 | 53 n_groups = getgroups (n, gbuf); |
| 54 if (n_groups < n) | |
| 818 | 55 break; |
| 56 n += 10; | |
| 57 } | |
| 58 | |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
59 saved_errno = errno; |
| 818 | 60 free (gbuf); |
|
4795
ac6111c4f643
Include <errno.h>, <stdlib.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4504
diff
changeset
|
61 errno = saved_errno; |
| 818 | 62 |
| 834 | 63 return n_groups; |
| 818 | 64 } |