util-linux/setarch.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * linux32/linux64 allows for changing uname emulation.
   4  *
   5  * Copyright 2002 Andi Kleen, SuSE Labs.
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 //usage:#define setarch_trivial_usage
  11 //usage:       "personality PROG ARGS"
  12 //usage:#define setarch_full_usage "\n\n"
  13 //usage:       "Personality may be:\n"
  14 //usage:       "        linux32         Set 32bit uname emulation\n"
  15 //usage:       "        linux64         Set 64bit uname emulation"
  16 //usage:
  17 //usage:#define linux32_trivial_usage NOUSAGE_STR
  18 //usage:#define linux32_full_usage ""
  19 //usage:
  20 //usage:#define linux64_trivial_usage NOUSAGE_STR
  21 //usage:#define linux64_full_usage ""
  22
  23 #include <sys/personality.h>
  24
  25 #include "libbb.h"
  26
  27 int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  28 int setarch_main(int argc UNUSED_PARAM, char **argv)
  29 {
  30         int pers;
  31
  32         /* Figure out what personality we are supposed to switch to ...
  33          * we can be invoked as either:
  34          * argv[0],argv[1] == "setarch","personality"
  35          * argv[0]         == "personality"
  36          */
  37         if (ENABLE_SETARCH && applet_name[0] == 's'
  38          && argv[1] && strncpy(argv[1], "linux", 5)
  39         ) {
  40                 applet_name = argv[1];
  41                 argv++;
  42         }
  43         if (applet_name[5] == '6') /* linux64 */
  44                 pers = PER_LINUX;
  45         else if (applet_name[5] == '3') /* linux32 */
  46                 pers = PER_LINUX32;
  47         else
  48                 bb_show_usage();
  49
  50         argv++;
  51         if (argv[0] == NULL)
  52                 bb_show_usage();
  53
  54         /* Try to set personality */
  55         if (personality(pers) >= 0) {
  56                 /* Try to execute the program */
  57                 BB_EXECVP(argv[0], argv);
  58         }
  59
  60         bb_simple_perror_msg_and_die(argv[0]);
  61 }