116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/* Low level child interface to ptrace.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef INF_PTRACE_H
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#define INF_PTRACE_H
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#include "gdbsupport/event-pipe.h"
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#include "inf-child.h"
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/* An abstract prototype ptrace target. The client can override it
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with local methods. */
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struct inf_ptrace_target : public inf_child_target
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{
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~inf_ptrace_target () override = 0;
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void attach (const char *, int) override;
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void detach (inferior *inf, int) override;
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void close () override;
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void resume (ptid_t, int, enum gdb_signal) override;
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ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
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void files_info () override;
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void kill () override;
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void create_inferior (const char *, const std::string &,
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char **, int) override;
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void mourn_inferior () override;
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bool thread_alive (ptid_t ptid) override;
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std::string pid_to_str (ptid_t) override;
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enum target_xfer_status xfer_partial (enum target_object object,
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const char *annex,
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gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len) override;
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bool is_async_p () override
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{ return m_event_pipe.is_open (); }
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int async_wait_fd () override
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{ return m_event_pipe.event_fd (); }
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/* Helper routine used from SIGCHLD handlers to signal the async
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event pipe. */
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static void async_file_mark_if_open ()
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{
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if (m_event_pipe.is_open ())
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m_event_pipe.mark ();
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}
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protected:
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/* Helper routines for interacting with the async event pipe. */
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bool async_file_open ()
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{ return m_event_pipe.open_pipe (); }
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void async_file_close ()
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{ m_event_pipe.close_pipe (); }
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void async_file_flush ()
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{ m_event_pipe.flush (); }
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void async_file_mark ()
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{ m_event_pipe.mark (); }
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/* Cleanup the inferior after a successful ptrace detach. */
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void detach_success (inferior *inf);
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/* Some targets don't allow us to request notification of inferior events
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such as fork and vfork immediately after the inferior is created.
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(This is because of how gdb creates inferiors via invoking a shell to
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do it. In such a scenario, if the shell init file has commands in it,
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the shell will fork and exec for each of those commands, and we will
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see each such fork event. Very bad.)
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Such targets will supply an appropriate definition for this
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function. */
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virtual void post_startup_inferior (ptid_t ptid) = 0;
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private:
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static event_pipe m_event_pipe;
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};
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#ifndef __NetBSD__
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/* Return which PID to pass to ptrace in order to observe/control the
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tracee identified by PTID.
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Unlike most other Operating Systems, NetBSD tracks both pid and lwp
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and avoids this function. */
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extern pid_t get_ptrace_pid (ptid_t);
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#endif
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#endif
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