#include <unistd.h>
#include <sys/syscall.h>
#endif
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include "linux-nat.h"
#include "nat/linux-ptrace.h"
#include "nat/linux-procfs.h"
#endif
/* Does the current host support PTRACE_GETREGSET? */
-int have_ptrace_getregset = -1;
+enum tribool have_ptrace_getregset = TRIBOOL_UNKNOWN;
/* The single-threaded native GNU/Linux target_ops. We save a pointer for
the use of the multi-threaded target. */
true, the new LWP remains stopped, otherwise it is continued. */
static int
-linux_handle_extended_wait (struct lwp_info *lp, int status,
- int stopping)
+linux_handle_extended_wait (struct lwp_info *lp, int status)
{
int pid = ptid_get_lwp (lp->ptid);
struct target_waitstatus *ourstatus = &lp->waitstatus;
ourstatus->kind = TARGET_WAITKIND_FORKED;
else if (event == PTRACE_EVENT_VFORK)
ourstatus->kind = TARGET_WAITKIND_VFORKED;
- else
+ else if (event == PTRACE_EVENT_CLONE)
{
struct lwp_info *new_lp;
new_lp = add_lwp (ptid_build (ptid_get_pid (lp->ptid), new_pid, 0));
new_lp->cloned = 1;
new_lp->stopped = 1;
-
- if (WSTOPSIG (status) != SIGSTOP)
- {
- /* This can happen if someone starts sending signals to
- the new thread before it gets a chance to run, which
- have a lower number than SIGSTOP (e.g. SIGUSR1).
- This is an unlikely case, and harder to handle for
- fork / vfork than for clone, so we do not try - but
- we handle it for clone events here. We'll send
- the other signal on to the thread below. */
-
- new_lp->signalled = 1;
- }
- else
- {
- struct thread_info *tp;
-
- /* When we stop for an event in some other thread, and
- pull the thread list just as this thread has cloned,
- we'll have seen the new thread in the thread_db list
- before handling the CLONE event (glibc's
- pthread_create adds the new thread to the thread list
- before clone'ing, and has the kernel fill in the
- thread's tid on the clone call with
- CLONE_PARENT_SETTID). If that happened, and the core
- had requested the new thread to stop, we'll have
- killed it with SIGSTOP. But since SIGSTOP is not an
- RT signal, it can only be queued once. We need to be
- careful to not resume the LWP if we wanted it to
- stop. In that case, we'll leave the SIGSTOP pending.
- It will later be reported as GDB_SIGNAL_0. */
- tp = find_thread_ptid (new_lp->ptid);
- if (tp != NULL && tp->stop_requested)
- new_lp->last_resume_kind = resume_stop;
- else
- status = 0;
- }
+ new_lp->resumed = 1;
/* If the thread_db layer is active, let it record the user
level thread id and status, and add the thread to GDB's
}
/* Even if we're stopping the thread for some reason
- internal to this module, from the user/frontend's
- perspective, this new thread is running. */
+ internal to this module, from the perspective of infrun
+ and the user/frontend, this new thread is running until
+ it next reports a stop. */
set_running (new_lp->ptid, 1);
- if (!stopping)
- {
- set_executing (new_lp->ptid, 1);
- /* thread_db_attach_lwp -> lin_lwp_attach_lwp forced
- resume_stop. */
- new_lp->last_resume_kind = resume_continue;
- }
+ set_executing (new_lp->ptid, 1);
- if (status != 0)
+ if (WSTOPSIG (status) != SIGSTOP)
{
+ /* This can happen if someone starts sending signals to
+ the new thread before it gets a chance to run, which
+ have a lower number than SIGSTOP (e.g. SIGUSR1).
+ This is an unlikely case, and harder to handle for
+ fork / vfork than for clone, so we do not try - but
+ we handle it for clone events here. */
+
+ new_lp->signalled = 1;
+
/* We created NEW_LP so it cannot yet contain STATUS. */
gdb_assert (new_lp->status == 0);
new_lp->status = status;
}
- new_lp->resumed = !stopping;
return 1;
}
/* Check if the thread has exited. */
if (WIFEXITED (status) || WIFSIGNALED (status))
{
+ if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "WL: Process %d exited.\n",
+ ptid_get_pid (lp->ptid));
+
+ /* This is the leader exiting, it means the whole
+ process is gone. Store the status to report to the
+ core. Store it in lp->waitstatus, because lp->status
+ would be ambiguous (W_EXITCODE(0,0) == 0). */
+ store_waitstatus (&lp->waitstatus, status);
+ return 0;
+ }
+
thread_dead = 1;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
fprintf_unfiltered (gdb_stdlog,
"WL: Handling extended status 0x%06x\n",
status);
- linux_handle_extended_wait (lp, status, 1);
+ linux_handle_extended_wait (lp, status);
return 0;
}
fprintf_unfiltered (gdb_stdlog,
"LLW: Handling extended status 0x%06x\n",
status);
- if (linux_handle_extended_wait (lp, status, 0))
+ if (linux_handle_extended_wait (lp, status))
return NULL;
}
}
}
- gdb_assert (lp->resumed);
-
+ /* Note that even if the leader was ptrace-stopped, it can still
+ exit, if e.g., some other thread brings down the whole
+ process (calls `exit'). So don't assert that the lwp is
+ resumed. */
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
- "Process %ld exited\n",
- ptid_get_lwp (lp->ptid));
+ "Process %ld exited (resumed=%d)\n",
+ ptid_get_lwp (lp->ptid), lp->resumed);
/* This was the last lwp in the process. Since events are
serialized to GDB core, we may not be able report this one
{
ptid_t *wait_ptid_p = data;
- if (lp->stopped
- && lp->resumed
- && !lwp_status_pending_p (lp))
+ if (!lp->stopped)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RSRL: NOT resuming LWP %s, not stopped\n",
+ target_pid_to_str (lp->ptid));
+ }
+ else if (!lp->resumed)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RSRL: NOT resuming LWP %s, not resumed\n",
+ target_pid_to_str (lp->ptid));
+ }
+ else if (lwp_status_pending_p (lp))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RSRL: NOT resuming LWP %s, has pending status\n",
+ target_pid_to_str (lp->ptid));
+ }
+ else
{
struct regcache *regcache = get_thread_regcache (lp->ptid);
struct gdbarch *gdbarch = get_regcache_arch (regcache);
char filename[64];
if (object != TARGET_OBJECT_MEMORY || !readbuf)
- return 0;
+ return TARGET_XFER_EOF;
/* Don't bother for one word. */
if (len < 3 * sizeof (long))
projects / deliverable / binutils-gdb.git / blobdiff