74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* Copyright (C) 1989, 1991, 1993 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <unistd.h>
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#include <string.h>
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#include <grp.h>
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#include <limits.h>
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#include <sys/types.h>
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/* Initialize the group set for the current user
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by reading the group database and using all groups
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of which USER is a member. Also include GROUP. */
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int
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DEFUN(initgroups, (user, group),
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CONST char *user AND gid_t group)
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{
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#ifdef NGROUPS_MAX
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#if NGROUPS_MAX == 0
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return 0;
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#else
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static PTR info = NULL;
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register FILE *stream;
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register struct group *g;
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gid_t groups[NGROUPS_MAX];
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register size_t n;
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if (info == NULL)
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{
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info = __grpalloc();
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if (info == NULL)
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return -1;
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}
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stream = __grpopen();
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if (stream == NULL)
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return -1;
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n = 0;
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groups[n++] = group;
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while (n < NGROUPS_MAX && (g = __grpread(stream, info)) != NULL)
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if (g->gr_gid != group)
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{
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register char **m;
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for (m = g->gr_mem; *m != NULL; ++m)
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if (!strcmp(*m, user))
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groups[n++] = g->gr_gid;
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}
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return setgroups(n, groups);
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#endif
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#else
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return 0;
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#endif
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}
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