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50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* `group_member' -- test if process is in a given group.
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Copyright (C) 1995-2025 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <limits.h>
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#ifndef NGROUPS_MAX
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#define NGROUPS_MAX 16 /* First guess. */
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#endif
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int
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__group_member (gid_t gid)
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{
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int n, size;
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gid_t *groups;
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size = NGROUPS_MAX;
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do
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{
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groups = __alloca (size * sizeof *groups);
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n = __getgroups (size, groups);
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size *= 2;
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}
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while (n == size / 2);
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while (n-- > 0)
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if (groups[n] == gid)
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return 1;
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return 0;
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}
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weak_alias (__group_member, group_member)
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