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Member "stress-ng-0.09.56/test/test-swapcontext.c" (15 Mar 2019, 1400 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 #include <ucontext.h>
   26 
   27 void func(void)
   28 {
   29     /* Just return */
   30 }
   31 
   32 
   33 int main(void)
   34 {
   35     static unsigned char stack[63336];
   36 
   37     ucontext_t u1, u2;
   38     if (getcontext(&u2) < 0)
   39         return -1;
   40     u2.uc_stack.ss_sp = stack;
   41     u2.uc_stack.ss_size = sizeof(stack);
   42     u2.uc_link = &u1;
   43 
   44     makecontext(&u2, func, 0);
   45 
   46     if (swapcontext(&u1, &u2) < 0)
   47         return -1;
   48     return 0;
   49 }