1 /* getugroups.c -- return a list of the groups a user is in
3 Copyright (C) 1990-1991, 1998-2000, 2003-2011 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by David MacKenzie. */
22 #include "getugroups.h"
26 #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
32 /* Mingw lacks all things related to group management. The best we
33 can do is fail with ENOSYS. */
36 getugroups (int maxcount _GL_UNUSED,
37 gid_t *grouplist _GL_UNUSED,
38 char const *username _GL_UNUSED,
45 #else /* HAVE_GRP_H */
48 # define STREQ(a, b) (strcmp (a, b) == 0)
50 /* Like `getgroups', but for user USERNAME instead of for the current
51 process. Store at most MAXCOUNT group IDs in the GROUPLIST array.
52 If GID is not -1, store it first (if possible). GID should be the
53 group ID (pw_gid) obtained from getpwuid, in case USERNAME is not
54 listed in /etc/groups. Upon failure, set errno and return -1.
55 Otherwise, return the number of IDs we've written into GROUPLIST. */
58 getugroups (int maxcount, gid_t *grouplist, char const *username,
63 if (gid != (gid_t) -1)
66 grouplist[count] = gid;
81 for (cp = grp->gr_mem; *cp; ++cp)
85 if ( ! STREQ (username, *cp))
88 /* See if this group number is already on the list. */
89 for (n = 0; n < count; ++n)
90 if (grouplist && grouplist[n] == grp->gr_gid)
93 /* If it's a new group number, then try to add it to the list. */
98 if (count >= maxcount)
100 grouplist[count] = grp->gr_gid;
102 if (count == INT_MAX)
117 int saved_errno = errno;
125 #endif /* HAVE_GRP_H */