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/* This testcase is part of GDB, the GNU debugger.
Copyright 2009-2023 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Test that GDB doesn't lose an event for a thread it didn't know
about, until an event is reported for it. */
#define _GNU_SOURCE
#include <sched.h>
#include <assert.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <features.h>
#ifdef __UCLIBC__
#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
#define HAS_NOMMU
#endif
#endif
#define STACK_SIZE 0x1000
static int
tkill (int lwpid, int signo)
{
return syscall (__NR_tkill, lwpid, signo);
}
static pid_t
local_gettid (void)
{
return syscall (__NR_gettid);
}
static int
fn (void *unused)
{
tkill (local_gettid (), SIGUSR1);
return 0;
}
int
main (int argc, char **argv)
{
unsigned char *stack;
int new_pid, status, ret;
stack = malloc (STACK_SIZE);
assert (stack != NULL);
new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
| CLONE_VM
#endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
, NULL, NULL, NULL, NULL);
assert (new_pid > 0);
/* Note the clone call above didn't use CLONE_THREAD, so it actually
put the new thread in a new thread group. However, the new clone
is still reported with PTRACE_EVENT_CLONE to GDB, since we didn't
use CLONE_VFORK (results in PTRACE_EVENT_VFORK) nor set the
termination signal to SIGCHLD (results in PTRACE_EVENT_FORK), so
GDB thinks of it as a new thread of the same inferior. It's a
bit of an odd setup, but it's not important for what we're
testing, and, it let's us conveniently use waitpid to wait for
the clone, which you can't with CLONE_THREAD. */
ret = waitpid (new_pid, &status, __WALL);
assert (ret == new_pid);
assert (WIFSIGNALED (status) && WTERMSIG (status) == SIGUSR1);
return 0;
}
|
