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152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
/* Copyright (C) 2001,02 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ucontext.h>
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static ucontext_t ctx[3];
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static int was_in_f1;
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static int was_in_f2;
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static char st2[8192];
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static void
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f1 (long a0, long a1, long a2, long a3)
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{
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printf ("start f1(a0=%lx,a1=%lx,a2=%lx,a3=%lx)\n", a0, a1, a2, a3);
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if (a0 != 1 || a1 != 2 || a2 != 3 || a3 != -4)
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{
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puts ("arg mismatch");
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exit (-1);
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}
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if (swapcontext (&ctx[1], &ctx[2]) != 0)
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{
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printf ("%s: swapcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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puts ("finish f1");
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was_in_f1 = 1;
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}
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static void
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f2 (void)
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{
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char on_stack[1];
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puts ("start f2");
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printf ("&on_stack=%p\n", on_stack);
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if (on_stack < st2 || on_stack >= st2 + sizeof (st2))
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{
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printf ("%s: memory stack is not where it belongs!", __FUNCTION__);
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exit (1);
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}
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if (swapcontext (&ctx[2], &ctx[1]) != 0)
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{
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printf ("%s: swapcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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puts ("finish f2");
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was_in_f2 = 1;
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}
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volatile int global;
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int
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main (void)
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{
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char st1[8192];
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puts ("making contexts");
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if (getcontext (&ctx[1]) != 0)
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{
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if (errno == ENOSYS)
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exit (0);
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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/* Play some tricks with this context. */
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if (++global == 1)
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if (setcontext (&ctx[1]) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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if (global != 2)
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{
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printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
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exit (1);
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}
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ctx[1].uc_stack.ss_sp = st1;
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ctx[1].uc_stack.ss_size = sizeof st1;
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ctx[1].uc_link = &ctx[0];
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{
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ucontext_t tempctx = ctx[1];
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makecontext (&ctx[1], (void (*) (void)) f1, 4, 1, 2, 3, -4);
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/* Without this check, a stub makecontext can make us spin forever. */
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if (memcmp (&tempctx, &ctx[1], sizeof ctx[1]) == 0)
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{
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puts ("makecontext was a no-op, presuming not implemented");
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return 0;
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}
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}
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if (getcontext (&ctx[2]) != 0)
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{
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printf ("%s: second getcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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ctx[2].uc_stack.ss_sp = st2;
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ctx[2].uc_stack.ss_size = sizeof st2;
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ctx[2].uc_link = &ctx[1];
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makecontext (&ctx[2], f2, 0);
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puts ("swapping contexts");
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if (swapcontext (&ctx[0], &ctx[2]) != 0)
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{
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printf ("%s: swapcontext: %m\n", __FUNCTION__);
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exit (1);
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}
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puts ("back at main program");
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if (was_in_f1 == 0)
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{
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puts ("didn't reach f1");
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exit (1);
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}
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if (was_in_f2 == 0)
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{
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puts ("didn't reach f2");
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exit (1);
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}
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puts ("test succeeded");
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return 0;
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}
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