76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Do not use threads as we need to exploit a bug in LWP code masked by the
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threads code otherwise.
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INFERIOR_PTID must point to exited LWP. Here we use the initial LWP as it
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is automatically INFERIOR_PTID for GDB.
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Finally we need to call target_resume (RESUME_ALL, ...) which we invoke by
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NEW_THREAD_EVENT (called from the new LWP as initial LWP is exited now). */
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#define _GNU_SOURCE
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#include <sched.h>
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#include <assert.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define STACK_SIZE 0x1000
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static int
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fn_return (void *unused)
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{
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return 0; /* at-fn_return */
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}
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static int
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fn (void *unused)
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{
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int i;
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unsigned char *stack;
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int new_pid;
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i = sleep (1);
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assert (i == 0);
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stack = malloc (STACK_SIZE);
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assert (stack != NULL);
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new_pid = clone (fn_return, stack + STACK_SIZE, CLONE_FILES | CLONE_VM, NULL,
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NULL, NULL, NULL);
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assert (new_pid > 0);
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return 0;
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}
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int
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main (int argc, char **argv)
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{
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unsigned char *stack;
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int new_pid;
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stack = malloc (STACK_SIZE);
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assert (stack != NULL);
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new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES | CLONE_VM, NULL, NULL,
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NULL, NULL);
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assert (new_pid > 0);
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return 0;
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}
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