-/* Multi-threaded debugging support for Linux (LWP layer).
+/* Multi-threaded debugging support for GNU/Linux (LWP layer).
Copyright 2000, 2001 Free Software Foundation, Inc.
This file is part of GDB.
static int debug_lin_lwp;
extern const char *strsignal (int sig);
-/* On Linux there are no real LWP's. The closest thing to LWP's are
- processes sharing the same VM space. A multi-threaded process is
- basically a group of such processes. However, such a grouping is
- almost entirely a user-space issue; the kernel doesn't enforce such
- a grouping at all (this might change in the future). In general,
- we'll rely on the threads library (i.e. the LinuxThreads library)
- to provide such a grouping.
+/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
+ are processes sharing the same VM space. A multi-threaded process
+ is basically a group of such processes. However, such a grouping
+ is almost entirely a user-space issue; the kernel doesn't enforce
+ such a grouping at all (this might change in the future). In
+ general, we'll rely on the threads library (i.e. the GNU/Linux
+ Threads library) to provide such a grouping.
It is perfectly well possible to write a multi-threaded application
without the assistance of a threads library, by using the clone
system call directly. This module should be able to give some
rudimentary support for debugging such applications if developers
specify the CLONE_PTRACE flag in the clone system call, and are
- using Linux 2.4 or above.
+ using the Linux kernel 2.4 or above.
- Note that there are some peculiarities in Linux that affect this
- code:
+ Note that there are some peculiarities in GNU/Linux that affect
+ this code:
- In general one should specify the __WCLONE flag to waitpid in
order to make it report events for any of the cloned processes
(and leave it out for the initial process). However, if a cloned
process has exited the exit status is only reported if the
- __WCLONE flag is absent. Linux 2.4 has a __WALL flag, but we
- cannot use it since GDB must work on older systems too.
+ __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
+ we cannot use it since GDB must work on older systems too.
- When a traced, cloned process exits and is waited for by the
debugger, the kernel reassigns it to the original parent and
- keeps it around as a "zombie". Somehow, the LinuxThreads library
- doesn't notice this, which leads to the "zombie problem": When
- debugged a multi-threaded process that spawns a lot of threads
- will run out of processes, even if the threads exit, because the
- "zombies" stay around. */
+ keeps it around as a "zombie". Somehow, the GNU/Linux Threads
+ library doesn't notice this, which leads to the "zombie problem":
+ When debugged a multi-threaded process that spawns a lot of
+ threads will run out of processes, even if the threads exit,
+ because the "zombies" stay around. */
/* Structure describing a LWP. */
struct lwp_info
and overall process id. */
ptid_t ptid;
+ /* Non-zero if this LWP is cloned. In this context "cloned" means
+ that the LWP is reporting to its parent using a signal other than
+ SIGCHLD. */
+ int cloned;
+
/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
it back yet). */
int signalled;
#define is_lwp(ptid) (GET_LWP (ptid) != 0)
#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
-#define is_cloned(pid) (GET_LWP (pid) != GET_PID (pid))
-
/* If the last reported event was a SIGTRAP, this variable is set to
the process id of the LWP/thread that got it. */
ptid_t trap_ptid;
/* Prototypes for local functions. */
static int stop_wait_callback (struct lwp_info *lp, void *data);
\f
+/* Convert wait status STATUS to a string. Used for printing debug
+ messages only. */
+
+static char *
+status_to_str (int status)
+{
+ static char buf[64];
+ if (WIFSTOPPED (status))
+ snprintf (buf, sizeof (buf), "%s (stopped)",
+ strsignal (WSTOPSIG (status)));
+ else if (WIFSIGNALED (status))
+ snprintf (buf, sizeof (buf), "%s (terminated)",
+ strsignal (WSTOPSIG (status)));
+ else
+ snprintf (buf, sizeof (buf), "%d (exited)",
+ WEXITSTATUS (status));
+
+ return buf;
+}
+\f
/* Initialize the list of LWPs. Note that this module, contrary to
what GDB's generic threads layer does for its thread list,
re-initializes the LWP lists whenever we mourn or detach (which
}
\f
-/* Implementation of the PREPARE_TO_PROCEED hook for the Linux LWP
+/* Implementation of the PREPARE_TO_PROCEED hook for the GNU/Linux LWP
layer.
Note that this implementation is potentially redundant now that
gdb_assert (is_lwp (ptid));
+ /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events
+ to interrupt either the ptrace() or waitpid() calls below. */
+ if (! sigismember (&blocked_mask, SIGCHLD))
+ {
+ sigaddset (&blocked_mask, SIGCHLD);
+ sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
+ }
+
if (verbose)
printf_filtered ("[New %s]\n", target_pid_to_str (ptid));
- /* We assume that we're already tracing the initial process. */
- if (is_cloned (ptid) && ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
- error ("Can't attach %s: %s", target_pid_to_str (ptid), strerror (errno));
-
lp = find_lwp_pid (ptid);
if (lp == NULL)
lp = add_lwp (ptid);
- if (is_cloned (ptid))
+ /* We assume that we're already attached to any LWP that has an
+ id equal to the overall process id. */
+ if (GET_LWP (ptid) != GET_PID (ptid))
{
- lp->signalled = 1;
- stop_wait_callback (lp, NULL);
+ pid_t pid;
+ int status;
+
+ if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
+ error ("Can't attach %s: %s", target_pid_to_str (ptid),
+ safe_strerror (errno));
+
+ pid = waitpid (GET_LWP (ptid), &status, 0);
+ if (pid == -1 && errno == ECHILD)
+ {
+ /* Try again with __WCLONE to check cloned processes. */
+ pid = waitpid (GET_LWP (ptid), &status, __WCLONE);
+ lp->cloned = 1;
+ }
+
+ gdb_assert (pid == GET_LWP (ptid)
+ && WIFSTOPPED (status) && WSTOPSIG (status));
+
+ lp->stopped = 1;
+ }
+ else
+ {
+ /* We assume that the LWP representing the original process
+ is already stopped. Mark it as stopped in the data structure
+ that the lin-lwp layer uses to keep track of threads. Note
+ that this won't have already been done since the main thread
+ will have, we assume, been stopped by an attach from a
+ different layer. */
+ lp->stopped = 1;
}
}
lin_lwp_attach (char *args, int from_tty)
{
struct lwp_info *lp;
+ pid_t pid;
+ int status;
/* FIXME: We should probably accept a list of process id's, and
attach all of them. */
child_ops.to_attach (args, from_tty);
/* Add the initial process as the first LWP to the list. */
- lp = add_lwp (BUILD_LWP (PIDGET (inferior_ptid), PIDGET (inferior_ptid)));
+ lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)));
/* Make sure the initial process is stopped. The user-level threads
layer might want to poke around in the inferior, and that won't
work if things haven't stabilized yet. */
- lp->signalled = 1;
- stop_wait_callback (lp, NULL);
- gdb_assert (lp->status == 0);
+ pid = waitpid (GET_PID (inferior_ptid), &status, 0);
+ if (pid == -1 && errno == ECHILD)
+ {
+ warning ("%s is a cloned process", target_pid_to_str (inferior_ptid));
+
+ /* Try again with __WCLONE to check cloned processes. */
+ pid = waitpid (GET_PID (inferior_ptid), &status, __WCLONE);
+ lp->cloned = 1;
+ }
+
+ gdb_assert (pid == GET_PID (inferior_ptid)
+ && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP);
+
+ lp->stopped = 1;
/* Fake the SIGSTOP that core GDB expects. */
lp->status = W_STOPCODE (SIGSTOP);
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
WSTOPSIG (lp->status)) < 0)
error ("Can't continue %s: %s", target_pid_to_str (lp->ptid),
- strerror (errno));
+ safe_strerror (errno));
lp->stopped = 0;
lp->signalled = 0;
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
}
- if (is_cloned (lp->ptid))
+ /* We don't actually detach from the LWP that has an id equal to the
+ overall process id just yet. */
+ if (GET_LWP (lp->ptid) != GET_PID (lp->ptid))
{
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
WSTOPSIG (lp->status)) < 0)
error ("Can't detach %s: %s", target_pid_to_str (lp->ptid),
- strerror (errno));
+ safe_strerror (errno));
delete_lwp (lp->ptid);
}
{
iterate_over_lwps (detach_callback, NULL);
- /* Only the initial (uncloned) process should be left right now. */
+ /* Only the initial process should be left right now. */
gdb_assert (num_lwps == 1);
trap_ptid = null_ptid;
{
struct thread_info *tp;
-#if 1
+#if 0
/* FIXME: kettenis/2000-08-26: This should really be handled
properly by core GDB. */
return 0;
}
-/* Wait until LP is stopped. */
+/* Wait until LP is stopped. If DATA is non-null it is interpreted as
+ a pointer to a set of signals to be flushed immediately. */
static int
stop_wait_callback (struct lwp_info *lp, void *data)
{
+ sigset_t *flush_mask = data;
+
if (! lp->stopped && lp->signalled)
{
pid_t pid;
int status;
- get_another_event:
gdb_assert (lp->status == 0);
- pid = waitpid (GET_LWP (lp->ptid), &status,
- is_cloned (lp->ptid) ? __WCLONE : 0);
+ pid = waitpid (GET_LWP (lp->ptid), &status, lp->cloned ? __WCLONE : 0);
if (pid == -1 && errno == ECHILD)
/* OK, the proccess has disappeared. We'll catch the actual
exit event in lin_lwp_wait. */
}
gdb_assert (WIFSTOPPED (status));
- lp->stopped = 1;
+
+ /* Ignore any signals in FLUSH_MASK. */
+ if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
+ {
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ return stop_wait_callback (lp, flush_mask);
+ }
if (WSTOPSIG (status) != SIGSTOP)
{
- if (WSTOPSIG (status) == SIGTRAP
- && breakpoint_inserted_here_p (read_pc_pid (pid_to_ptid (pid))
- - DECR_PC_AFTER_BREAK))
+ if (WSTOPSIG (status) == SIGTRAP)
{
/* If a LWP other than the LWP that we're reporting an
event for has hit a GDB breakpoint (as opposed to
user will delete or disable the breakpoint, but the
thread will have already tripped on it. */
- if (debug_lin_lwp)
- fprintf_unfiltered (gdb_stdlog,
- "Tripped breakpoint at %lx in LWP %d"
- " while waiting for SIGSTOP.\n",
- (long) read_pc_pid (lp->ptid), pid);
-
- /* Set the PC to before the trap. */
- if (DECR_PC_AFTER_BREAK)
- write_pc_pid (read_pc_pid (pid_to_ptid (pid))
- - DECR_PC_AFTER_BREAK,
- pid_to_ptid (pid));
-
/* Now resume this LWP and get the SIGSTOP event. */
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- goto get_another_event;
- }
- else if (WSTOPSIG (status) == SIGINT &&
- signal_pass_state (SIGINT) == 0)
- {
- /* Since SIGINT gets forwarded to the entire process group
- (in the case where ^C/BREAK is typed at the tty/console),
- just ignore all SIGINT events from all lwp's except for
- the one that was caught by lin_lwp_wait. */
-
- /* Now resume this LWP and get the SIGSTP event. */
- ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- goto get_another_event;
+ if (debug_lin_lwp)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "SWC: Candidate SIGTRAP event in %ld\n",
+ GET_LWP (lp->ptid));
+ }
+ /* Hold the SIGTRAP for handling by lin_lwp_wait. */
+ stop_wait_callback (lp, data);
+ /* If there's another event, throw it back into the queue. */
+ if (lp->status)
+ kill (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
+ /* Save the sigtrap event. */
+ lp->status = status;
+ return 0;
}
else
{
+ /* The thread was stopped with a signal other than
+ SIGSTOP, and didn't accidentally trip a breakpoint. */
+
if (debug_lin_lwp)
- fprintf_unfiltered (gdb_stdlog,
- "Received %s in LWP %d while waiting for SIGSTOP.\n",
- strsignal (WSTOPSIG (status)), pid);
+ {
+ fprintf_unfiltered (gdb_stderr,
+ "SWC: Pending event %d in %ld\n",
+ WSTOPSIG (status), GET_LWP (lp->ptid));
+ }
+ /* Now resume this LWP and get the SIGSTOP event. */
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- /* The thread was stopped with a signal other than
- SIGSTOP, and didn't accidentally trip a breakpoint.
- Record the wait status. */
- lp->status = status;
+ /* Hold this event/waitstatus while we check to see if
+ there are any more (we still want to get that SIGSTOP). */
+ stop_wait_callback (lp, data);
+ /* If the lp->status field is still empty, use it to hold
+ this event. If not, then this event must be returned
+ to the event queue of the LWP. */
+ if (lp->status == 0)
+ lp->status = status;
+ else
+ kill (GET_LWP (lp->ptid), WSTOPSIG (status));
+ return 0;
}
}
else
{
/* We caught the SIGSTOP that we intended to catch, so
there's no SIGSTOP pending. */
+ lp->stopped = 1;
lp->signalled = 0;
}
}
return (lp->stopped == 0);
}
+/* Count the LWP's that have had events. */
+
+static int
+count_events_callback (struct lwp_info *lp, void *data)
+{
+ int *count = data;
+
+ gdb_assert (count != NULL);
+
+ /* Count only LWPs that have a SIGTRAP event pending. */
+ if (lp->status != 0
+ && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
+ (*count)++;
+
+ return 0;
+}
+
+/* Select the LWP (if any) that is currently being single-stepped. */
+
+static int
+select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
+{
+ if (lp->step && lp->status != 0)
+ return 1;
+ else
+ return 0;
+}
+
+/* Select the Nth LWP that has had a SIGTRAP event. */
+
+static int
+select_event_lwp_callback (struct lwp_info *lp, void *data)
+{
+ int *selector = data;
+
+ gdb_assert (selector != NULL);
+
+ /* Select only LWPs that have a SIGTRAP event pending. */
+ if (lp->status != 0
+ && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
+ if ((*selector)-- == 0)
+ return 1;
+
+ return 0;
+}
+
+static int
+cancel_breakpoints_callback (struct lwp_info *lp, void *data)
+{
+ struct lwp_info *event_lp = data;
+
+ /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
+ if (lp == event_lp)
+ return 0;
+
+ /* If a LWP other than the LWP that we're reporting an event for has
+ hit a GDB breakpoint (as opposed to some random trap signal),
+ then just arrange for it to hit it again later. We don't keep
+ the SIGTRAP status and don't forward the SIGTRAP signal to the
+ LWP. We will handle the current event, eventually we will resume
+ all LWPs, and this one will get its breakpoint trap again.
+
+ If we do not do this, then we run the risk that the user will
+ delete or disable the breakpoint, but the LWP will have already
+ tripped on it. */
+
+ if (lp->status != 0
+ && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
+ && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
+ DECR_PC_AFTER_BREAK))
+ {
+ if (debug_lin_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "Push back breakpoint for LWP %ld\n",
+ GET_LWP (lp->ptid));
+
+ /* Back up the PC if necessary. */
+ if (DECR_PC_AFTER_BREAK)
+ write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid);
+
+ /* Throw away the SIGTRAP. */
+ lp->status = 0;
+ }
+
+ return 0;
+}
+
+/* Select one LWP out of those that have events pending. */
+
+static void
+select_event_lwp (struct lwp_info **orig_lp, int *status)
+{
+ int num_events = 0;
+ int random_selector;
+ struct lwp_info *event_lp;
+
+ /* Record the wait status for the origional LWP. */
+ (*orig_lp)->status = *status;
+
+ /* Give preference to any LWP that is being single-stepped. */
+ event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL);
+ if (event_lp != NULL)
+ {
+ if (debug_lin_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "Select single-step LWP %ld\n",
+ GET_LWP (event_lp->ptid));
+ }
+ else
+ {
+ /* No single-stepping LWP. Select one at random, out of those
+ which have had SIGTRAP events. */
+
+ /* First see how many SIGTRAP events we have. */
+ iterate_over_lwps (count_events_callback, &num_events);
+
+ /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
+ random_selector = (int)
+ ((num_events * (double) rand ()) / (RAND_MAX + 1.0));
+
+ if (debug_lin_lwp && num_events > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Found %d SIGTRAP events, selecting #%d\n",
+ num_events, random_selector);
+
+ event_lp = iterate_over_lwps (select_event_lwp_callback,
+ &random_selector);
+ }
+
+ if (event_lp != NULL)
+ {
+ /* Switch the event LWP. */
+ *orig_lp = event_lp;
+ *status = event_lp->status;
+ }
+
+ /* Flush the wait status for the event LWP. */
+ (*orig_lp)->status = 0;
+}
+
/* Return non-zero if LP has been resumed. */
static int
return lp->resumed;
}
+#ifdef CHILD_WAIT
+
+/* We need to override child_wait to support attaching to cloned
+ processes, since a normal wait (as done by the default version)
+ ignores those processes. */
+
+/* Wait for child PTID to do something. Return id of the child,
+ minus_one_ptid in case of error; store status into *OURSTATUS. */
+
+ptid_t
+child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+{
+ int save_errno;
+ int status;
+ pid_t pid;
+
+ do
+ {
+ set_sigint_trap (); /* Causes SIGINT to be passed on to the
+ attached process. */
+ set_sigio_trap ();
+
+ pid = waitpid (GET_PID (ptid), &status, 0);
+ if (pid == -1 && errno == ECHILD)
+ /* Try again with __WCLONE to check cloned processes. */
+ pid = waitpid (GET_PID (ptid), &status, __WCLONE);
+ save_errno = errno;
+
+ clear_sigio_trap ();
+ clear_sigint_trap ();
+ }
+ while (pid == -1 && save_errno == EINTR);
+
+ if (pid == -1)
+ {
+ warning ("Child process unexpectedly missing: %s", safe_strerror (errno));
+
+ /* Claim it exited with unknown signal. */
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ return minus_one_ptid;
+ }
+
+ store_waitstatus (ourstatus, status);
+ return pid_to_ptid (pid);
+}
+
+#endif
+
static ptid_t
lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
{
int options = 0;
int status = 0;
pid_t pid = PIDGET (ptid);
+ sigset_t flush_mask;
+
+ sigemptyset (&flush_mask);
/* Make sure SIGCHLD is blocked. */
if (! sigismember (&blocked_mask, SIGCHLD))
retry:
- /* Make sure there is at least one thread that has been resumed. */
- gdb_assert (iterate_over_lwps (resumed_callback, NULL));
+ /* Make sure there is at least one LWP that has been resumed, at
+ least if there are any LWPs at all. */
+ gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL));
/* First check if there is a LWP with a wait status pending. */
if (pid == -1)
{
- /* Any LWP will do. */
+ /* Any LWP that's been resumed will do. */
lp = iterate_over_lwps (status_callback, NULL);
if (lp)
{
- if (debug_lin_lwp)
- fprintf_unfiltered (gdb_stdlog,
- "Using pending wait status for LWP %ld.\n",
- GET_LWP (lp->ptid));
-
status = lp->status;
lp->status = 0;
+
+ if (debug_lin_lwp && status)
+ fprintf_unfiltered (gdb_stdlog,
+ "Using pending wait status %s for LWP %ld.\n",
+ status_to_str (status), GET_LWP (lp->ptid));
}
/* But if we don't fine one, we'll have to wait, and check both
status = lp->status;
lp->status = 0;
- if (debug_lin_lwp)
- if (status)
- fprintf_unfiltered (gdb_stdlog,
- "Using pending wait status for LWP %ld.\n",
- GET_LWP (lp->ptid));
+ if (debug_lin_lwp && status)
+ fprintf_unfiltered (gdb_stdlog,
+ "Using pending wait status %s for LWP %ld.\n",
+ status_to_str (status), GET_LWP (lp->ptid));
/* If we have to wait, take into account whether PID is a cloned
process or not. And we have to convert it to something that
the layer beneath us can understand. */
- options = is_cloned (lp->ptid) ? __WCLONE : 0;
+ options = lp->cloned ? __WCLONE : 0;
pid = GET_LWP (ptid);
}
if (! lp)
{
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
+ if (options & __WCLONE)
+ lp->cloned = 1;
+
if (threaded)
{
gdb_assert (WIFSTOPPED (status)
status = 0;
goto retry;
}
+
+ if (signo == TARGET_SIGNAL_INT
+ && signal_pass_state (signo) == 0)
+ {
+ /* If ^C/BREAK is typed at the tty/console, SIGINT gets
+ forwarded to the entire process group, that is, all LWP's
+ will receive it. Since we only want to report it once,
+ we try to flush it from all LWPs except this one. */
+ sigaddset (&flush_mask, SIGINT);
+ }
}
/* This LWP is stopped now. */
lp->stopped = 1;
+ if (debug_lin_lwp)
+ fprintf_unfiltered (gdb_stdlog, "Candidate event %s in LWP %ld.\n",
+ status_to_str (status), GET_LWP (lp->ptid));
+
/* Now stop all other LWP's ... */
iterate_over_lwps (stop_callback, NULL);
/* ... and wait until all of them have reported back that they're no
longer running. */
- iterate_over_lwps (stop_wait_callback, NULL);
+ iterate_over_lwps (stop_wait_callback, &flush_mask);
+
+ /* If we're not waiting for a specific LWP, choose an event LWP from
+ among those that have had events. Giving equal priority to all
+ LWPs that have had events helps prevent starvation. */
+ if (pid == -1)
+ select_event_lwp (&lp, &status);
+
+ /* Now that we've selected our final event LWP, cancel any
+ breakpoints in other LWPs that have hit a GDB breakpoint. See
+ the comment in cancel_breakpoints_callback to find out why. */
+ iterate_over_lwps (cancel_breakpoints_callback, lp);
/* If we're not running in "threaded" mode, we'll report the bare
process id. */
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
- trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
+ {
+ trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
+ if (debug_lin_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: trap_ptid is %ld\n",
+ GET_LWP (trap_ptid));
+ }
else
trap_ptid = null_ptid;
/* For cloned processes we must check both with __WCLONE and
without, since the exit status of a cloned process isn't reported
with __WCLONE. */
- if (is_cloned (lp->ptid))
+ if (lp->cloned)
{
do
{
add_show_from_set (add_set_cmd ("lin-lwp", no_class, var_zinteger,
(char *) &debug_lin_lwp,
- "Set debugging of linux lwp module.\n\
+ "Set debugging of GNU/Linux lwp module.\n\
Enables printf debugging output.\n",
&setdebuglist),
&showdebuglist);
\f
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
- the LinuxThreads library and therefore doesn't really belong here. */
+ the GNU/Linux Threads library and therefore doesn't really belong
+ here. */
/* Read variable NAME in the target and return its value if found.
Otherwise return zero. It is assumed that the type of the variable
sigaddset (set, restart);
sigaddset (set, cancel);
- /* The LinuxThreads library makes terminating threads send a special
- "cancel" signal instead of SIGCHLD. Make sure we catch those (to
- prevent them from terminating GDB itself, which is likely to be
- their default action) and treat them the same way as SIGCHLD. */
+ /* The GNU/Linux Threads library makes terminating threads send a
+ special "cancel" signal instead of SIGCHLD. Make sure we catch
+ those (to prevent them from terminating GDB itself, which is
+ likely to be their default action) and treat them the same way as
+ SIGCHLD. */
action.sa_handler = sigchld_handler;
sigemptyset (&action.sa_mask);
projects / deliverable / binutils-gdb.git / blobdiff