release/src/router/busybox/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 #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 argc UNUSED_PARAM, char **argv)
  16 {
  17         int pers;
  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         if (ENABLE_SETARCH && applet_name[0] == 's'
  25          && argv[1] && strncpy(argv[1], "linux", 5)
  26         ) {
  27                 applet_name = argv[1];
  28                 argv++;
  29         }
  30         if (applet_name[5] == '6') /* linux64 */
  31                 pers = PER_LINUX;
  32         else if (applet_name[5] == '3') /* linux32 */
  33                 pers = PER_LINUX32;
  34         else
  35                 bb_show_usage();
  36
  37         argv++;
  38         if (argv[0] == NULL)
  39                 bb_show_usage();
  40
  41         /* Try to set personality */
  42         if (personality(pers) >= 0) {
  43                 /* Try to execute the program */
  44                 BB_EXECVP(argv[0], argv);
  45         }
  46
  47         bb_simple_perror_msg_and_die(argv[0]);
  48 }