/* Low-level child interface to ptrace.
- Copyright (C) 1988-2020 Free Software Foundation, Inc.
+ Copyright (C) 1988-2022 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "command.h"
#include "inferior.h"
-#include "inflow.h"
#include "terminal.h"
#include "gdbcore.h"
#include "regcache.h"
#endif
}
-/* A unique_ptr helper to unpush a target. */
-
-struct target_unpusher
-{
- void operator() (struct target_ops *ops) const
- {
- unpush_target (ops);
- }
-};
-
-/* A unique_ptr that unpushes a target on destruction. */
-
-typedef std::unique_ptr<struct target_ops, target_unpusher> target_unpush_up;
-
-\f
+/* The event pipe registered as a waitable file in the event loop. */
+event_pipe inf_ptrace_target::m_event_pipe;
inf_ptrace_target::~inf_ptrace_target ()
{}
-#ifdef PT_GET_PROCESS_STATE
-
-/* Target hook for follow_fork. On entry and at return inferior_ptid is
- the ptid of the followed inferior. */
-
-bool
-inf_ptrace_target::follow_fork (bool follow_child, bool detach_fork)
-{
- if (!follow_child)
- {
- struct thread_info *tp = inferior_thread ();
- pid_t child_pid = tp->pending_follow.value.related_pid.pid ();
-
- /* Breakpoints have already been detached from the child by
- infrun.c. */
-
- if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
- perror_with_name (("ptrace"));
- }
-
- return false;
-}
-
-int
-inf_ptrace_target::insert_fork_catchpoint (int pid)
-{
- return 0;
-}
-
-int
-inf_ptrace_target::remove_fork_catchpoint (int pid)
-{
- return 0;
-}
-
-#endif /* PT_GET_PROCESS_STATE */
\f
/* Prepare to be traced. */
const std::string &allargs,
char **env, int from_tty)
{
- pid_t pid;
- ptid_t ptid;
+ inferior *inf = current_inferior ();
/* Do not change either targets above or the same target if already present.
The reason is the target stack is shared across multiple inferiors. */
- int ops_already_pushed = target_is_pushed (this);
+ int ops_already_pushed = inf->target_is_pushed (this);
target_unpush_up unpusher;
if (! ops_already_pushed)
{
/* Clear possible core file with its process_stratum. */
- push_target (this);
+ inf->push_target (this);
unpusher.reset (this);
}
- pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL,
- NULL, NULL, NULL);
+ pid_t pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL,
+ NULL, NULL, NULL);
- ptid = ptid_t (pid);
+ ptid_t ptid (pid);
/* We have something that executes now. We'll be running through
the shell at this point (if startup-with-shell is true), but the
pid shouldn't change. */
- add_thread_silent (this, ptid);
+ thread_info *thr = add_thread_silent (this, ptid);
+ switch_to_thread (thr);
unpusher.release ();
/* On some targets, there must be some explicit actions taken after
the inferior has been started up. */
- target_post_startup_inferior (ptid);
+ post_startup_inferior (ptid);
}
-#ifdef PT_GET_PROCESS_STATE
-
-void
-inf_ptrace_target::post_startup_inferior (ptid_t pid)
-{
- ptrace_event_t pe;
-
- /* Set the initial event mask. */
- memset (&pe, 0, sizeof pe);
- pe.pe_set_event |= PTRACE_FORK;
- if (ptrace (PT_SET_EVENT_MASK, pid.pid (),
- (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
- perror_with_name (("ptrace"));
-}
-
-#endif
-
/* Clean up a rotting corpse of an inferior after it died. */
void
void
inf_ptrace_target::attach (const char *args, int from_tty)
{
- pid_t pid;
- struct inferior *inf;
+ inferior *inf = current_inferior ();
/* Do not change either targets above or the same target if already present.
The reason is the target stack is shared across multiple inferiors. */
- int ops_already_pushed = target_is_pushed (this);
+ int ops_already_pushed = inf->target_is_pushed (this);
- pid = parse_pid_to_attach (args);
+ pid_t pid = parse_pid_to_attach (args);
if (pid == getpid ()) /* Trying to masturbate? */
error (_("I refuse to debug myself!"));
{
/* target_pid_to_str already uses the target. Also clear possible core
file with its process_stratum. */
- push_target (this);
+ inf->push_target (this);
unpusher.reset (this);
}
- if (from_tty)
- {
- const char *exec_file = get_exec_file (0);
-
- if (exec_file)
- printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
- target_pid_to_str (ptid_t (pid)).c_str ());
- else
- printf_unfiltered (_("Attaching to %s\n"),
- target_pid_to_str (ptid_t (pid)).c_str ());
- }
+ target_announce_attach (from_tty, pid);
#ifdef PT_ATTACH
errno = 0;
error (_("This system does not support attaching to a process"));
#endif
- inf = current_inferior ();
inferior_appeared (inf, pid);
inf->attach_flag = 1;
- inferior_ptid = ptid_t (pid);
/* Always add a main thread. If some target extends the ptrace
target, it should decorate the ptid later with more info. */
- thread_info *thr = add_thread_silent (this, inferior_ptid);
+ thread_info *thr = add_thread_silent (this, ptid_t (pid));
+ switch_to_thread (thr);
+
/* Don't consider the thread stopped until we've processed its
initial SIGSTOP stop. */
set_executing (this, thr->ptid, true);
unpusher.release ();
}
-#ifdef PT_GET_PROCESS_STATE
-
-void
-inf_ptrace_target::post_attach (int pid)
-{
- ptrace_event_t pe;
-
- /* Set the initial event mask. */
- memset (&pe, 0, sizeof pe);
- pe.pe_set_event |= PTRACE_FORK;
- if (ptrace (PT_SET_EVENT_MASK, pid,
- (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
- perror_with_name (("ptrace"));
-}
-
-#endif
-
/* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */
void
void
inf_ptrace_target::detach_success (inferior *inf)
{
- inferior_ptid = null_ptid;
+ switch_to_no_thread ();
detach_inferior (inf);
maybe_unpush_target ();
ptid_t
inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
- int options)
+ target_wait_flags target_options)
{
pid_t pid;
- int status, save_errno;
+ int options, status, save_errno;
+
+ options = 0;
+ if (target_options & TARGET_WNOHANG)
+ options |= WNOHANG;
do
{
do
{
- pid = waitpid (ptid.pid (), &status, 0);
+ pid = waitpid (ptid.pid (), &status, options);
save_errno = errno;
}
while (pid == -1 && errno == EINTR);
clear_sigint_trap ();
- if (pid == -1)
+ if (pid == 0)
{
- fprintf_unfiltered (gdb_stderr,
- _("Child process unexpectedly missing: %s.\n"),
- safe_strerror (save_errno));
-
- /* Claim it exited with unknown signal. */
- ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
- return inferior_ptid;
+ gdb_assert (target_options & TARGET_WNOHANG);
+ ourstatus->set_ignore ();
+ return minus_one_ptid;
}
- /* Ignore terminated detached child processes. */
- if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ())
- pid = -1;
- }
- while (pid == -1);
-
-#ifdef PT_GET_PROCESS_STATE
- if (WIFSTOPPED (status))
- {
- ptrace_state_t pe;
- pid_t fpid;
-
- if (ptrace (PT_GET_PROCESS_STATE, pid,
- (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
- perror_with_name (("ptrace"));
-
- switch (pe.pe_report_event)
+ if (pid == -1)
{
- case PTRACE_FORK:
- ourstatus->kind = TARGET_WAITKIND_FORKED;
- ourstatus->value.related_pid = ptid_t (pe.pe_other_pid);
-
- /* Make sure the other end of the fork is stopped too. */
- fpid = waitpid (pe.pe_other_pid, &status, 0);
- if (fpid == -1)
- perror_with_name (("waitpid"));
-
- if (ptrace (PT_GET_PROCESS_STATE, fpid,
- (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
- perror_with_name (("ptrace"));
-
- gdb_assert (pe.pe_report_event == PTRACE_FORK);
- gdb_assert (pe.pe_other_pid == pid);
- if (fpid == inferior_ptid.pid ())
+ /* In async mode the SIGCHLD might have raced and triggered
+ a check for an event that had already been reported. If
+ the event was the exit of the only remaining child,
+ waitpid() will fail with ECHILD. */
+ if (ptid == minus_one_ptid && save_errno == ECHILD)
{
- ourstatus->value.related_pid = ptid_t (pe.pe_other_pid);
- return ptid_t (fpid);
+ ourstatus->set_no_resumed ();
+ return minus_one_ptid;
}
- return ptid_t (pid);
+ gdb_printf (gdb_stderr,
+ _("Child process unexpectedly missing: %s.\n"),
+ safe_strerror (save_errno));
+
+ ourstatus->set_ignore ();
+ return minus_one_ptid;
}
+
+ /* Ignore terminated detached child processes. */
+ if (!WIFSTOPPED (status) && find_inferior_pid (this, pid) == nullptr)
+ pid = -1;
}
-#endif
+ while (pid == -1);
+
+ *ourstatus = host_status_to_waitstatus (status);
- store_waitstatus (ourstatus, status);
return ptid_t (pid);
}
{
struct inferior *inf = current_inferior ();
- printf_filtered (_("\tUsing the running image of %s %s.\n"),
- inf->attach_flag ? "attached" : "child",
- target_pid_to_str (inferior_ptid).c_str ());
+ gdb_printf (_("\tUsing the running image of %s %s.\n"),
+ inf->attach_flag ? "attached" : "child",
+ target_pid_to_str (inferior_ptid).c_str ());
}
std::string
{
return normal_pid_to_str (ptid);
}
+
+/* Implement the "close" target method. */
+
+void
+inf_ptrace_target::close ()
+{
+ /* Unregister from the event loop. */
+ if (is_async_p ())
+ async (0);
+
+ inf_child_target::close ();
+}
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