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Member "stress-ng-0.09.56/test/test-modify-ldt.c" (15 Mar 2019, 1679 Bytes) of package /linux/privat/stress-ng-0.09.56.tar.xz:


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    1 /*
    2  * Copyright (C) 2013-2019 Canonical, Ltd.
    3  *
    4  * This program is free software; you can redistribute it and/or
    5  * modify it under the terms of the GNU General Public License
    6  * as published by the Free Software Foundation; either version 2
    7  * of the License, or (at your option) any later version.
    8  *
    9  * This program is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12  * GNU General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU General Public License
   15  * along with this program; if not, write to the Free Software
   16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   17  *
   18  * This code is a complete clean re-write of the stress tool by
   19  * Colin Ian King <colin.king@canonical.com> and attempts to be
   20  * backwardly compatible with the stress tool by Amos Waterland
   21  * <apw@rossby.metr.ou.edu> but has more stress tests and more
   22  * functionality.
   23  *
   24  */
   25 #define _GNU_SOURCE
   26 
   27 #include <unistd.h>
   28 #include <sys/syscall.h>
   29 #include <sys/types.h>
   30 #include <asm/ldt.h>
   31 #include <string.h>
   32 
   33 #if !defined(__NR_modify_ldt)
   34 #error modify_ldt syscall not defined
   35 #endif
   36 
   37 /* Arch specific, x86 */
   38 #if defined(__x86_64__) || defined(__x86_64) || \
   39     defined(__i386__)   || defined(__i386)
   40 #else
   41 #error modify_ldt syscall not applicable for non-x86 architectures
   42 #endif
   43 
   44 int main(void)
   45 {
   46     struct user_desc ud;
   47     int ret;
   48 
   49     (void)memset(&ud, 0, sizeof(ud));
   50     ret = syscall(__NR_modify_ldt, 0, &ud, sizeof(ud));
   51     if (ret == 0)
   52         ret = syscall(__NR_modify_ldt, 1, &ud, sizeof(ud));
   53 
   54     return ret;
   55 }