gdb/inf-child.h

   1 /* Base/prototype target for default child (native) targets.
   2
   3    Copyright (C) 2004-2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef INF_CHILD_H
  21 #define INF_CHILD_H
  22
  23 #include "target.h"
  24
  25 /* A prototype child target.  The client can override it with local
  26    methods.  */
  27
  28 class inf_child_target
  29   : public memory_breakpoint_target<target_ops>
  30 {
  31 public:
  32   inf_child_target ();
  33   ~inf_child_target () override = 0;
  34
  35   const target_info &info () const override;
  36
  37   void close () override;
  38
  39   void disconnect (const char *, int) override;
  40
  41   void fetch_registers (struct regcache *, int) override = 0;
  42   void store_registers (struct regcache *, int) override = 0;
  43
  44   void prepare_to_store (struct regcache *) override;
  45
  46   bool supports_terminal_ours () override;
  47   void terminal_init () override;
  48   void terminal_inferior () override;
  49   void terminal_save_inferior () override;
  50   void terminal_ours_for_output () override;
  51   void terminal_ours () override;
  52   void terminal_info (const char *, int) override;
  53
  54   void interrupt () override;
  55   void pass_ctrlc () override;
  56
  57   void post_startup_inferior (ptid_t) override;
  58
  59   void mourn_inferior () override;
  60
  61   bool can_run () override;
  62
  63   bool can_create_inferior () override;
  64   void create_inferior (const char *, const std::string &,
  65                         char **, int) override = 0;
  66
  67   bool can_attach () override;
  68   void attach (const char *, int) override = 0;
  69
  70   void post_attach (int) override;
  71
  72   /* We must default these because they must be implemented by any
  73      target that can run.  */
  74   bool can_async_p ()  override { return false; }
  75   bool supports_non_stop ()  override { return false; }
  76   bool supports_disable_randomization () override { return false; }
  77
  78   char *pid_to_exec_file (int pid) override;
  79
  80   bool has_all_memory () override;
  81   bool has_memory () override;
  82   bool has_stack () override;
  83   bool has_registers () override;
  84   bool has_execution (ptid_t) override;
  85
  86   int fileio_open (struct inferior *inf, const char *filename,
  87                    int flags, int mode, int warn_if_slow,
  88                    int *target_errno) override;
  89   int fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
  90                      ULONGEST offset, int *target_errno) override;
  91   int fileio_pread (int fd, gdb_byte *read_buf, int len,
  92                     ULONGEST offset, int *target_errno) override;
  93   int fileio_fstat (int fd, struct stat *sb, int *target_errno) override;
  94   int fileio_close (int fd, int *target_errno) override;
  95   int fileio_unlink (struct inferior *inf,
  96                      const char *filename,
  97                      int *target_errno) override;
  98   gdb::optional<std::string> fileio_readlink (struct inferior *inf,
  99                                               const char *filename,
 100                                               int *target_errno) override;
 101   bool use_agent (bool use) override;
 102
 103   bool can_use_agent () override;
 104
 105 protected:
 106   /* Unpush the target if it wasn't explicitly open with "target native"
 107      and there are no live inferiors left.  Note: if calling this as a
 108      result of a mourn or detach, the current inferior shall already
 109      have its PID cleared, so it isn't counted as live.  That's usually
 110      done by calling either generic_mourn_inferior or
 111      detach_inferior.  */
 112   void maybe_unpush_target ();
 113 };
 114
 115 /* Functions for helping to write a native target.  */
 116
 117 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
 118 extern void store_waitstatus (struct target_waitstatus *, int);
 119
 120 /* Register TARGET as native target and set it up to respond to the
 121    "target native" command.  */
 122 extern void add_inf_child_target (inf_child_target *target);
 123
 124 /* target_open_ftype callback for inf-child targets.  Used by targets
 125    that want to register an alternative target_info object.  Most
 126    targets use add_inf_child_target instead.  */
 127 extern void inf_child_open_target (const char *arg, int from_tty);
 128
 129 #endif