busybox/util-linux/setarch.c

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/* vi: set sw=4 ts=4: */
/*
* linux32/linux64 allows for changing uname emulation.
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*
* 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 ""
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#include <sys/personality.h>
#include "libbb.h"
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int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int setarch_main(int argc UNUSED_PARAM, char **argv)
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{
int pers;
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/* 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"
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*/
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 */
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pers = PER_LINUX;
else if (applet_name[5] == '3') /* linux32 */
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pers = PER_LINUX32;
else
bb_show_usage();
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argv++;
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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);
}
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bb_simple_perror_msg_and_die(argv[0]);
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}