/* Check setcontext on the context from makecontext. Copyright (C) 2018-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #include <stdio.h> #include <stdlib.h> #include <ucontext.h> #include <unistd.h> #include <stdatomic.h> static ucontext_t ctx[5]; static atomic_int done; static void f1 (void) { puts ("start f1"); if (!done) { if (getcontext (&ctx[2]) != 0) { printf ("%s: getcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } if (done) { puts ("set context in f1"); if (setcontext (&ctx[3]) != 0) { printf ("%s: setcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } } } done++; puts ("swap contexts in f1"); if (swapcontext (&ctx[4], &ctx[2]) != 0) { printf ("%s: setcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } puts ("end f1"); exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE); } static int do_test (void) { char st1[32768]; puts ("making contexts"); if (getcontext (&ctx[0]) != 0) { printf ("%s: getcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } if (getcontext (&ctx[1]) != 0) { printf ("%s: getcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } ctx[1].uc_stack.ss_sp = st1; ctx[1].uc_stack.ss_size = sizeof st1; ctx[1].uc_link = &ctx[0]; makecontext (&ctx[1], (void (*) (void)) f1, 0); puts ("swap contexts"); if (swapcontext (&ctx[3], &ctx[1]) != 0) { printf ("%s: setcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } if (done != 1) exit (EXIT_FAILURE); done++; puts ("set context"); if (setcontext (&ctx[4]) != 0) { printf ("%s: setcontext: %m\n", __FUNCTION__); exit (EXIT_FAILURE); } exit (EXIT_FAILURE); } #include <support/test-driver.c>