source: MondoRescue/branches/3.2/mindi-busybox/util-linux/setarch.c

/* vi: set sw=4 ts=4: */
/*
 * linux32/linux64 allows for changing uname emulation.
 *
 * Copyright 2002 Andi Kleen, SuSE Labs.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define setarch_trivial_usage
//usage:       "personality PROG ARGS"
//usage:#define setarch_full_usage "\n\n"
//usage:       "Personality may be:\n"
//usage:       "    linux32     Set 32bit uname emulation\n"
//usage:       "    linux64     Set 64bit uname emulation"
//usage:
//usage:#define linux32_trivial_usage NOUSAGE_STR
//usage:#define linux32_full_usage ""
//usage:
//usage:#define linux64_trivial_usage NOUSAGE_STR
//usage:#define linux64_full_usage ""

#include <sys/personality.h>

#include "libbb.h"

int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setarch_main(int argc UNUSED_PARAM, char **argv)
{
    int pers;

    /* Figure out what personality we are supposed to switch to ...
     * we can be invoked as either:
     * argv[0],argv[1] == "setarch","personality"
     * argv[0]         == "personality"
     */
    if (ENABLE_SETARCH && applet_name[0] == 's'
     && argv[1] && strncpy(argv[1], "linux", 5)
    ) {
        applet_name = argv[1];
        argv++;
    }
    if (applet_name[5] == '6') /* linux64 */
        pers = PER_LINUX;
    else if (applet_name[5] == '3') /* linux32 */
        pers = PER_LINUX32;
    else
        bb_show_usage();

    argv++;
    if (argv[0] == NULL)
        bb_show_usage();

    /* Try to set personality */
    if (personality(pers) >= 0) {
        /* Try to execute the program */
        BB_EXECVP(argv[0], argv);
    }

    bb_simple_perror_msg_and_die(argv[0]);
}