1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/libexec/lib/src/common.cc Sun Jun 12 17:50:58 2022 +0200
1.3 @@ -0,0 +1,59 @@
1.4 +/*
1.5 + * Common functionality.
1.6 + *
1.7 + * Copyright (C) 2022 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include <l4/util/elf.h>
1.26 +
1.27 +#include "common.h"
1.28 +
1.29 +
1.30 +
1.31 +/* Find the L4Re auxiliary structure from program argument details. */
1.32 +
1.33 +l4re_aux_t *exec_get_l4re_aux(int argc, char *argv[])
1.34 +{
1.35 + /* Start after the final terminator (at argc) of the argument vector. */
1.36 +
1.37 + l4_umword_t *arg = ((l4_umword_t *) &argv[argc]) + 1;
1.38 +
1.39 + /* The environment vector is traversed. */
1.40 +
1.41 + while (*arg)
1.42 + arg++;
1.43 +
1.44 + /* Skip the terminating null entry. */
1.45 +
1.46 + arg++;
1.47 +
1.48 + /* Traverse the auxiliary vector. */
1.49 +
1.50 + struct auxv_entry *entry = (struct auxv_entry *) arg;
1.51 +
1.52 + for (; entry->key; entry++)
1.53 + {
1.54 + if (entry->key == AT_L4_AUX)
1.55 + return (l4re_aux_t *) entry->value;
1.56 + }
1.57 +
1.58 + return NULL;
1.59 +}
1.60 +
1.61 +/* vim: tabstop=2 expandtab shiftwidth=2
1.62 +*/