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author | Roland McGrath <roland@gnu.org> | 1995-02-18 01:27:10 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 1995-02-18 01:27:10 +0000 |
commit | 28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch) | |
tree | 15f07c4c43d635959c6afee96bde71fb1b3614ee /grp/initgroups.c | |
download | glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.zip glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.bz2 |
initial import
Diffstat (limited to 'grp/initgroups.c')
-rw-r--r-- | grp/initgroups.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/grp/initgroups.c b/grp/initgroups.c new file mode 100644 index 0000000..5af1926 --- /dev/null +++ b/grp/initgroups.c @@ -0,0 +1,73 @@ +/* Copyright (C) 1989, 1991, 1993 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <unistd.h> +#include <string.h> +#include <grp.h> +#include <limits.h> +#include <sys/types.h> + + +/* Initialize the group set for the current user + by reading the group database and using all groups + of which USER is a member. Also include GROUP. */ +int +DEFUN(initgroups, (user, group), + CONST char *user AND gid_t group) +{ +#ifdef NGROUPS_MAX +#if NGROUPS_MAX == 0 + return 0; +#else + static PTR info = NULL; + register FILE *stream; + register struct group *g; + gid_t groups[NGROUPS_MAX]; + register size_t n; + + if (info == NULL) + { + info = __grpalloc(); + if (info == NULL) + return -1; + } + + stream = __grpopen(); + if (stream == NULL) + return -1; + + n = 0; + groups[n++] = group; + + while (n < NGROUPS_MAX && (g = __grpread(stream, info)) != NULL) + if (g->gr_gid != group) + { + register char **m; + + for (m = g->gr_mem; *m != NULL; ++m) + if (!strcmp(*m, user)) + groups[n++] = g->gr_gid; + } + + return setgroups(n, groups); +#endif +#else + return 0; +#endif +} |