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 GPL v2 or later, see file License for details.
   8 */
   9
  10 #include <sys/personality.h>
  11
  12 #include "libbb.h"
  13
  14 int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  15 int setarch_main(int ATTRIBUTE_UNUSED argc, char **argv)
  16 {
  17         int pers = -1;
  18
  19         /* Figure out what personality we are supposed to switch to ...
  20          * we can be invoked as either:
  21          * argv[0],argv[1] -> "setarch","personality"
  22          * argv[0]         -> "personality"
  23          */
  24 retry:
  25         if (argv[0][5] == '6') /* linux64 */
  26                 pers = PER_LINUX;
  27         else if (argv[0][5] == '3') /* linux32 */
  28                 pers = PER_LINUX32;
  29         else if (pers == -1 && argv[1] != NULL) {
  30                 pers = PER_LINUX32;
  31                 ++argv;
  32                 goto retry;
  33         }
  34
  35         /* make user actually gave us something to do */
  36         ++argv;
  37         if (argv[0] == NULL)
  38                 bb_show_usage();
  39
  40         /* Try to set personality */
  41         if (personality(pers) >= 0) {
  42
  43                 /* Try to execute the program */
  44                 BB_EXECVP(argv[0], argv);
  45         }
  46
  47         bb_simple_perror_msg_and_die(argv[0]);
  48 }