/* 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 ()
{}
const std::string &allargs,
char **env, int from_tty)
{
+ 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);
}
/* 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);
}
/* Clean up a rotting corpse of an inferior after it died. */
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;
ptid_t
inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
- target_wait_flags 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 == 0)
+ {
+ gdb_assert (target_options & TARGET_WNOHANG);
+ ourstatus->set_ignore ();
+ return minus_one_ptid;
+ }
+
if (pid == -1)
{
- 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;
+ /* 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->set_no_resumed ();
+ return minus_one_ptid;
+ }
+
+ 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. */
}
while (pid == -1);
- store_waitstatus (ourstatus, status);
+ *ourstatus = host_status_to_waitstatus (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 ();
+}
projects / binutils-gdb.git / blobdiff