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- /* Subroutines for handling an "inferior" (child) process as a target
- for debugging, in GDB.
- Copyright 1990, 1991 Free Software Foundation, Inc.
- Contributed by Cygnus Support.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "frame.h" /* required by inferior.h */
- #include "inferior.h"
- #include "target.h"
- #include "wait.h"
- #include "gdbcore.h"
- #include "ieee-float.h" /* Required by REGISTER_CONVERT_TO_XXX */
-
- static void
- child_prepare_to_store PARAMS ((void));
-
- static int
- child_wait PARAMS ((int *));
-
- static void
- child_open PARAMS ((char *, int));
-
- static void
- child_files_info PARAMS ((struct target_ops *));
-
- static void
- child_detach PARAMS ((char *, int));
-
- /* Forward declaration */
- extern struct target_ops child_ops;
-
- /* Wait for child to do something. Return pid of child, or -1 in case
- of error; store status through argument pointer STATUS. */
-
- static int
- child_wait (status)
- int *status;
- {
- int pid;
-
- do {
- #ifdef USE_PROC_FS
- pid = proc_wait (status);
- #else
- pid = wait (status);
- #endif
- if (pid == -1) /* No more children to wait for */
- {
- fprintf (stderr, "Child process unexpectedly missing.\n");
- *status = 42; /* Claim it exited with signal 42 */
- return -1;
- }
- } while (pid != inferior_pid); /* Some other child died or stopped */
- return pid;
- }
-
-
- /*
- * child_detach()
- * takes a program previously attached to and detaches it.
- * The program resumes execution and will no longer stop
- * on signals, etc. We better not have left any breakpoints
- * in the program or it'll die when it hits one. For this
- * to work, it may be necessary for the process to have been
- * previously attached. It *might* work if the program was
- * started via the normal ptrace (PTRACE_TRACEME).
- */
-
- static void
- child_detach (args, from_tty)
- char *args;
- int from_tty;
- {
- int siggnal = 0;
-
- #ifdef ATTACH_DETACH
- if (from_tty)
- {
- char *exec_file = get_exec_file (0);
- if (exec_file == 0)
- exec_file = "";
- printf ("Detaching program: %s pid %d\n",
- exec_file, inferior_pid);
- fflush (stdout);
- }
- if (args)
- siggnal = atoi (args);
-
- detach (siggnal);
- inferior_pid = 0;
- unpush_target (&child_ops); /* Pop out of handling an inferior */
- #else
- error ("This version of Unix does not support detaching a process.");
- #endif
- }
-
- /* Get ready to modify the registers array. On machines which store
- individual registers, this doesn't need to do anything. On machines
- which store all the registers in one fell swoop, this makes sure
- that registers contains all the registers from the program being
- debugged. */
-
- static void
- child_prepare_to_store ()
- {
- #ifdef CHILD_PREPARE_TO_STORE
- CHILD_PREPARE_TO_STORE ();
- #endif
- }
-
- /* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
- /* Some machines won't need to use regnum. */
- /* ARGSUSED */
- void
- host_convert_to_virtual (regnum, from, to)
- int regnum;
- char *from;
- char *to;
- {
- REGISTER_CONVERT_TO_VIRTUAL (regnum, from, to);
- }
-
- /* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
- /* ARGSUSED */
- void
- host_convert_from_virtual (regnum, from, to)
- int regnum;
- char *from;
- char *to;
- {
- REGISTER_CONVERT_TO_RAW (regnum, from, to);
- }
-
- /* Print status information about what we're accessing. */
-
- static void
- child_files_info (ignore)
- struct target_ops *ignore;
- {
- printf ("\tUsing the running image of %s process %d.\n",
- attach_flag? "attached": "child", inferior_pid);
- }
-
- /* ARGSUSED */
- static void
- child_open (arg, from_tty)
- char *arg;
- int from_tty;
- {
- error ("Use the \"run\" command to start a Unix child process.");
- }
-
- struct target_ops child_ops = {
- "child", /* to_shortname */
- "Unix child process", /* to_longname */
- "Unix child process (started by the \"run\" command).", /* to_doc */
- child_open, /* to_open */
- 0, /* to_close */
- child_attach, /* to_attach */
- child_detach, /* to_detach */
- child_resume, /* to_resume */
- child_wait, /* to_wait */
- fetch_inferior_registers, /* to_fetch_registers */
- store_inferior_registers, /* to_store_registers */
- child_prepare_to_store, /* to_prepare_to_store */
- host_convert_to_virtual, /* to_convert_to_virtual */
- host_convert_from_virtual, /* to_convert_from_virtual */
- child_xfer_memory, /* to_xfer_memory */
- child_files_info, /* to_files_info */
- memory_insert_breakpoint, /* to_insert_breakpoint */
- memory_remove_breakpoint, /* to_remove_breakpoint */
- terminal_init_inferior, /* to_terminal_init */
- terminal_inferior, /* to_terminal_inferior */
- terminal_ours_for_output, /* to_terminal_ours_for_output */
- terminal_ours, /* to_terminal_ours */
- child_terminal_info, /* to_terminal_info */
- kill_inferior, /* to_kill */
- 0, /* to_load */
- 0, /* to_lookup_symbol */
- child_create_inferior, /* to_create_inferior */
- child_mourn_inferior, /* to_mourn_inferior */
- process_stratum, /* to_stratum */
- 0, /* to_next */
- 1, /* to_has_all_memory */
- 1, /* to_has_memory */
- 1, /* to_has_stack */
- 1, /* to_has_registers */
- 1, /* to_has_execution */
- 0, /* sections */
- 0, /* sections_end */
- OPS_MAGIC /* to_magic */
- };
-
- void
- _initialize_inftarg ()
- {
- add_target (&child_ops);
- }
-