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/*
* libexplain - Explain errno values returned by libc functions
* Copyright (C) 2013 Peter Miller
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 3 of the License, or (at your
* option) any later version.
*
* This program 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 General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/stdio.h>
#include <libexplain/ac/stdlib.h>
#include <libexplain/ac/pwd.h>
#include <libexplain/ac/sys/types.h>
#include <libexplain/getgrouplist.h>
#include <libexplain/malloc.h>
#include <libexplain/output.h>
#include <libexplain/string_to_thing.h>
#include <libexplain/wrap_and_print.h>
#include <explain/syscall/getgrouplist.h>
void
explain_syscall_getgrouplist(int errnum, int argc, char **argv)
{
const char *user;
gid_t group;
int group_set = 0;
gid_t *groups;
int ngroups;
user = 0;
group = 0;
groups = 0;
ngroups = 0;
/*
* <user> [[ <group> [ <groups> ] ] <ngroups> ]
*/
switch (argc)
{
case 4:
ngroups = explain_parse_int_or_die(argv[3]);
groups = explain_parse_pointer_or_die(argv[3]);
group = explain_parse_gid_t_or_die(argv[1]);
group_set = 1;
user = argv[0];
break;
case 3:
ngroups = explain_parse_int_or_die(argv[3]);
group = explain_parse_gid_t_or_die(argv[1]);
group_set = 1;
user = argv[0];
break;
case 2:
ngroups = explain_parse_int_or_die(argv[3]);
user = argv[0];
break;
case 1:
user = argv[0];
break;
default:
explain_output_error_and_die
(
"getgrouplist: requires 4 arguments, not %d\n",
argc
);
}
if (!groups)
{
size_t groups_size = (ngroups < 1 ? 1 : ngroups) * sizeof(*groups);
groups = explain_malloc_or_die(groups_size);
}
if (!group_set)
{
struct passwd *pw = getpwnam(user);
if (!pw)
explain_output_error_and_die("user \"%s\" unknown", user);
group = pw->pw_gid;
}
explain_wrap_and_print
(
stdout,
explain_errno_getgrouplist(errnum, user, group, groups, &ngroups)
);
}
/* vim: set ts=8 sw=4 et : */
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