diff options
Diffstat (limited to 'posix/group_member.c')
-rw-r--r-- | posix/group_member.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/posix/group_member.c b/posix/group_member.c new file mode 100644 index 0000000..7bd9c46 --- /dev/null +++ b/posix/group_member.c @@ -0,0 +1,50 @@ +/* `group_member' -- test if process is in a given group. + Copyright (C) 1995, 1997, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sys/types.h> +#include <unistd.h> +#include <stdlib.h> +#include <limits.h> + +#ifndef NGROUPS_MAX +#define NGROUPS_MAX 16 /* First guess. */ +#endif + +int +__group_member (gid) + gid_t gid; +{ + int n, size; + gid_t *groups; + + size = NGROUPS_MAX; + do + { + groups = __alloca (size * sizeof *groups); + n = __getgroups (size, groups); + size *= 2; + } while (n == size / 2); + + while (n >= 0) + if (groups[n--] == gid) + return 1; + + return 0; +} +weak_alias (__group_member, group_member) |