| /* Target-vector operations for controlling Unix child processes, for GDB. |
| |
| Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
| 2000, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
| |
| Contributed by Cygnus Support. |
| |
| ## Contains temporary hacks.. |
| |
| 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., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "defs.h" |
| #include "frame.h" /* required by inferior.h */ |
| #include "inferior.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "command.h" |
| #include "gdb_stat.h" |
| #include <signal.h> |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include "gdb_wait.h" |
| #include "inflow.h" |
| |
| extern struct symtab_and_line *child_enable_exception_callback (enum |
| exception_event_kind, |
| int); |
| |
| extern struct exception_event_record |
| *child_get_current_exception_event (void); |
| |
| extern void _initialize_inftarg (void); |
| |
| static void child_prepare_to_store (void); |
| |
| #ifndef CHILD_WAIT |
| static ptid_t child_wait (ptid_t, struct target_waitstatus *); |
| #endif /* CHILD_WAIT */ |
| |
| static void child_open (char *, int); |
| |
| static void child_files_info (struct target_ops *); |
| |
| static void child_detach (char *, int); |
| |
| static void child_attach (char *, int); |
| |
| #if !defined(CHILD_POST_ATTACH) |
| extern void child_post_attach (int); |
| #endif |
| |
| static void ptrace_me (void); |
| |
| static void ptrace_him (int); |
| |
| static void child_create_inferior (char *, char *, char **, int); |
| |
| static void child_mourn_inferior (void); |
| |
| static int child_can_run (void); |
| |
| static void child_stop (void); |
| |
| #ifndef CHILD_THREAD_ALIVE |
| int child_thread_alive (ptid_t); |
| #endif |
| |
| static void init_child_ops (void); |
| |
| extern char **environ; |
| |
| int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to |
| be a runnable target. Used by targets |
| that can sit atop inftarg, such as HPUX |
| thread support. */ |
| |
| #ifndef CHILD_WAIT |
| |
| /* Wait for child to do something. Return pid of child, or -1 in case |
| of error; store status through argument pointer OURSTATUS. */ |
| |
| static ptid_t |
| child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) |
| { |
| int save_errno; |
| int status; |
| char *execd_pathname = NULL; |
| int exit_status; |
| int syscall_id; |
| enum target_waitkind kind; |
| int pid; |
| |
| do |
| { |
| set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| attached process. */ |
| set_sigio_trap (); |
| |
| pid = wait (&status); |
| |
| save_errno = errno; |
| |
| clear_sigio_trap (); |
| |
| clear_sigint_trap (); |
| |
| if (pid == -1) |
| { |
| if (save_errno == EINTR) |
| continue; |
| |
| 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 = TARGET_SIGNAL_UNKNOWN; |
| return pid_to_ptid (-1); |
| } |
| |
| /* Did it exit? |
| */ |
| if (target_has_exited (pid, status, &exit_status)) |
| { |
| /* ??rehrauer: For now, ignore this. */ |
| continue; |
| } |
| |
| if (!target_thread_alive (pid_to_ptid (pid))) |
| { |
| ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| return pid_to_ptid (pid); |
| } |
| } while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */ |
| |
| store_waitstatus (ourstatus, status); |
| return pid_to_ptid (pid); |
| } |
| #endif /* CHILD_WAIT */ |
| |
| #ifndef CHILD_THREAD_ALIVE |
| |
| /* Check to see if the given thread is alive. |
| |
| FIXME: Is kill() ever the right way to do this? I doubt it, but |
| for now we're going to try and be compatable with the old thread |
| code. */ |
| int |
| child_thread_alive (ptid_t ptid) |
| { |
| pid_t pid = PIDGET (ptid); |
| |
| return (kill (pid, 0) != -1); |
| } |
| |
| #endif |
| |
| /* Attach to process PID, then initialize for debugging it. */ |
| |
| static void |
| child_attach (char *args, int from_tty) |
| { |
| char *exec_file; |
| int pid; |
| char *dummy; |
| |
| if (!args) |
| error_no_arg (_("process-id to attach")); |
| |
| dummy = args; |
| pid = strtol (args, &dummy, 0); |
| /* Some targets don't set errno on errors, grrr! */ |
| if ((pid == 0) && (args == dummy)) |
| error (_("Illegal process-id: %s."), args); |
| |
| if (pid == getpid ()) /* Trying to masturbate? */ |
| error (_("I refuse to debug myself!")); |
| |
| if (from_tty) |
| { |
| exec_file = (char *) get_exec_file (0); |
| |
| if (exec_file) |
| printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
| target_pid_to_str (pid_to_ptid (pid))); |
| else |
| printf_unfiltered (_("Attaching to %s\n"), |
| target_pid_to_str (pid_to_ptid (pid))); |
| |
| gdb_flush (gdb_stdout); |
| } |
| |
| attach (pid); |
| |
| inferior_ptid = pid_to_ptid (pid); |
| push_target (&deprecated_child_ops); |
| } |
| |
| #if !defined(CHILD_POST_ATTACH) |
| void |
| child_post_attach (int pid) |
| { |
| /* This version of Unix doesn't require a meaningful "post attach" |
| operation by a debugger. */ |
| } |
| #endif |
| |
| /* Take a program previously attached to and detaches it. |
| The program resumes execution and will no longer stop |
| on signals, etc. We'd 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 (char *args, int from_tty) |
| { |
| int siggnal = 0; |
| int pid = PIDGET (inferior_ptid); |
| |
| if (from_tty) |
| { |
| char *exec_file = get_exec_file (0); |
| if (exec_file == 0) |
| exec_file = ""; |
| printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
| target_pid_to_str (pid_to_ptid (pid))); |
| gdb_flush (gdb_stdout); |
| } |
| if (args) |
| siggnal = atoi (args); |
| |
| detach (siggnal); |
| |
| inferior_ptid = null_ptid; |
| unpush_target (&deprecated_child_ops); |
| } |
| |
| /* 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 (void) |
| { |
| #ifdef CHILD_PREPARE_TO_STORE |
| CHILD_PREPARE_TO_STORE (); |
| #endif |
| } |
| |
| /* Print status information about what we're accessing. */ |
| |
| static void |
| child_files_info (struct target_ops *ignore) |
| { |
| printf_unfiltered (_("\tUsing the running image of %s %s.\n"), |
| attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid)); |
| } |
| |
| static void |
| child_open (char *arg, int from_tty) |
| { |
| error (_("Use the \"run\" command to start a Unix child process.")); |
| } |
| |
| /* Stub function which causes the inferior that runs it, to be ptrace-able |
| by its parent process. */ |
| |
| static void |
| ptrace_me (void) |
| { |
| /* "Trace me, Dr. Memory!" */ |
| call_ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0); |
| } |
| |
| /* Stub function which causes the GDB that runs it, to start ptrace-ing |
| the child process. */ |
| |
| static void |
| ptrace_him (int pid) |
| { |
| push_target (&deprecated_child_ops); |
| |
| /* On some targets, there must be some explicit synchronization |
| between the parent and child processes after the debugger |
| forks, and before the child execs the debuggee program. This |
| call basically gives permission for the child to exec. |
| */ |
| |
| target_acknowledge_created_inferior (pid); |
| |
| /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, |
| * and will be 1 or 2 depending on whether we're starting |
| * without or with a shell. |
| */ |
| startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| |
| /* On some targets, there must be some explicit actions taken after |
| the inferior has been started up. |
| */ |
| target_post_startup_inferior (pid_to_ptid (pid)); |
| } |
| |
| /* Start an inferior Unix child process and sets inferior_ptid to its pid. |
| EXEC_FILE is the file to run. |
| ALLARGS is a string containing the arguments to the program. |
| ENV is the environment vector to pass. Errors reported with error(). */ |
| |
| static void |
| child_create_inferior (char *exec_file, char *allargs, char **env, |
| int from_tty) |
| { |
| fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL); |
| } |
| |
| #if !defined(CHILD_POST_STARTUP_INFERIOR) |
| void |
| child_post_startup_inferior (ptid_t ptid) |
| { |
| /* This version of Unix doesn't require a meaningful "post startup inferior" |
| operation by a debugger. |
| */ |
| } |
| #endif |
| |
| #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR) |
| void |
| child_acknowledge_created_inferior (int pid) |
| { |
| /* This version of Unix doesn't require a meaningful "acknowledge created inferior" |
| operation by a debugger. |
| */ |
| } |
| #endif |
| |
| |
| #if !defined(CHILD_INSERT_FORK_CATCHPOINT) |
| void |
| child_insert_fork_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of fork |
| events. */ |
| } |
| #endif |
| |
| #if !defined(CHILD_REMOVE_FORK_CATCHPOINT) |
| int |
| child_remove_fork_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of fork events. */ |
| return 0; |
| } |
| #endif |
| |
| #if !defined(CHILD_INSERT_VFORK_CATCHPOINT) |
| void |
| child_insert_vfork_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of vfork |
| events. */ |
| } |
| #endif |
| |
| #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT) |
| int |
| child_remove_vfork_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of vfork events. */ |
| return 0; |
| } |
| #endif |
| |
| #if !defined(CHILD_FOLLOW_FORK) |
| int |
| child_follow_fork (struct target_ops *ops, int follow_child) |
| { |
| /* This version of Unix doesn't support following fork or vfork events. */ |
| return 0; |
| } |
| #endif |
| |
| #if !defined(CHILD_INSERT_EXEC_CATCHPOINT) |
| void |
| child_insert_exec_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of exec |
| events. */ |
| } |
| #endif |
| |
| #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT) |
| int |
| child_remove_exec_catchpoint (int pid) |
| { |
| /* This version of Unix doesn't support notification of exec events. */ |
| return 0; |
| } |
| #endif |
| |
| #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) |
| int |
| child_reported_exec_events_per_exec_call (void) |
| { |
| /* This version of Unix doesn't support notification of exec events. |
| */ |
| return 1; |
| } |
| #endif |
| |
| #if !defined(CHILD_HAS_EXITED) |
| int |
| child_has_exited (int pid, int wait_status, int *exit_status) |
| { |
| if (WIFEXITED (wait_status)) |
| { |
| *exit_status = WEXITSTATUS (wait_status); |
| return 1; |
| } |
| |
| if (WIFSIGNALED (wait_status)) |
| { |
| *exit_status = 0; /* ?? Don't know what else to say here. */ |
| return 1; |
| } |
| |
| /* ?? Do we really need to consult the event state, too? Assume the |
| wait_state alone suffices. |
| */ |
| return 0; |
| } |
| #endif |
| |
| |
| static void |
| child_mourn_inferior (void) |
| { |
| unpush_target (&deprecated_child_ops); |
| generic_mourn_inferior (); |
| } |
| |
| static int |
| child_can_run (void) |
| { |
| /* This variable is controlled by modules that sit atop inftarg that may layer |
| their own process structure atop that provided here. hpux-thread.c does |
| this because of the Hpux user-mode level thread model. */ |
| |
| return !child_suppress_run; |
| } |
| |
| /* Send a SIGINT to the process group. This acts just like the user typed a |
| ^C on the controlling terminal. |
| |
| XXX - This may not be correct for all systems. Some may want to use |
| killpg() instead of kill (-pgrp). */ |
| |
| static void |
| child_stop (void) |
| { |
| kill (-inferior_process_group, SIGINT); |
| } |
| |
| #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK) |
| struct symtab_and_line * |
| child_enable_exception_callback (enum exception_event_kind kind, int enable) |
| { |
| return (struct symtab_and_line *) NULL; |
| } |
| #endif |
| |
| #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT) |
| struct exception_event_record * |
| child_get_current_exception_event (void) |
| { |
| return (struct exception_event_record *) NULL; |
| } |
| #endif |
| |
| |
| #if !defined(CHILD_PID_TO_EXEC_FILE) |
| char * |
| child_pid_to_exec_file (int pid) |
| { |
| /* This version of Unix doesn't support translation of a process ID |
| to the filename of the executable file. |
| */ |
| return NULL; |
| } |
| #endif |
| |
| char * |
| child_core_file_to_sym_file (char *core) |
| { |
| /* The target stratum for a running executable need not support |
| this operation. |
| */ |
| return NULL; |
| } |
| |
| /* Perform a partial transfer to/from the specified object. For |
| memory transfers, fall back to the old memory xfer functions. */ |
| |
| static LONGEST |
| child_xfer_partial (struct target_ops *ops, enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, LONGEST len) |
| { |
| switch (object) |
| { |
| case TARGET_OBJECT_MEMORY: |
| if (readbuf) |
| return child_xfer_memory (offset, readbuf, len, 0/*write*/, |
| NULL, ops); |
| if (writebuf) |
| return child_xfer_memory (offset, (void *) writebuf, len, 1/*write*/, |
| NULL, ops); |
| return -1; |
| |
| case TARGET_OBJECT_UNWIND_TABLE: |
| #ifndef NATIVE_XFER_UNWIND_TABLE |
| #define NATIVE_XFER_UNWIND_TABLE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1) |
| #endif |
| return NATIVE_XFER_UNWIND_TABLE (ops, object, annex, readbuf, writebuf, |
| offset, len); |
| |
| case TARGET_OBJECT_AUXV: |
| #ifndef NATIVE_XFER_AUXV |
| #define NATIVE_XFER_AUXV(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1) |
| #endif |
| return NATIVE_XFER_AUXV (ops, object, annex, readbuf, writebuf, |
| offset, len); |
| |
| default: |
| return -1; |
| } |
| } |
| |
| #if !defined(CHILD_PID_TO_STR) |
| char * |
| child_pid_to_str (ptid_t ptid) |
| { |
| return normal_pid_to_str (ptid); |
| } |
| #endif |
| |
| static void |
| init_child_ops (void) |
| { |
| deprecated_child_ops.to_shortname = "child"; |
| deprecated_child_ops.to_longname = "Unix child process"; |
| deprecated_child_ops.to_doc = "Unix child process (started by the \"run\" command)."; |
| deprecated_child_ops.to_open = child_open; |
| deprecated_child_ops.to_attach = child_attach; |
| deprecated_child_ops.to_post_attach = child_post_attach; |
| deprecated_child_ops.to_detach = child_detach; |
| deprecated_child_ops.to_resume = child_resume; |
| deprecated_child_ops.to_wait = child_wait; |
| deprecated_child_ops.to_fetch_registers = fetch_inferior_registers; |
| deprecated_child_ops.to_store_registers = store_inferior_registers; |
| deprecated_child_ops.to_prepare_to_store = child_prepare_to_store; |
| deprecated_child_ops.deprecated_xfer_memory = child_xfer_memory; |
| deprecated_child_ops.to_xfer_partial = child_xfer_partial; |
| deprecated_child_ops.to_files_info = child_files_info; |
| deprecated_child_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| deprecated_child_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| deprecated_child_ops.to_terminal_init = terminal_init_inferior; |
| deprecated_child_ops.to_terminal_inferior = terminal_inferior; |
| deprecated_child_ops.to_terminal_ours_for_output = terminal_ours_for_output; |
| deprecated_child_ops.to_terminal_save_ours = terminal_save_ours; |
| deprecated_child_ops.to_terminal_ours = terminal_ours; |
| deprecated_child_ops.to_terminal_info = child_terminal_info; |
| deprecated_child_ops.to_kill = kill_inferior; |
| deprecated_child_ops.to_create_inferior = child_create_inferior; |
| deprecated_child_ops.to_post_startup_inferior = child_post_startup_inferior; |
| deprecated_child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior; |
| deprecated_child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; |
| deprecated_child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint; |
| deprecated_child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; |
| deprecated_child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint; |
| deprecated_child_ops.to_follow_fork = child_follow_fork; |
| deprecated_child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; |
| deprecated_child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint; |
| deprecated_child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call; |
| deprecated_child_ops.to_has_exited = child_has_exited; |
| deprecated_child_ops.to_mourn_inferior = child_mourn_inferior; |
| deprecated_child_ops.to_can_run = child_can_run; |
| deprecated_child_ops.to_thread_alive = child_thread_alive; |
| deprecated_child_ops.to_pid_to_str = child_pid_to_str; |
| deprecated_child_ops.to_stop = child_stop; |
| deprecated_child_ops.to_enable_exception_callback = child_enable_exception_callback; |
| deprecated_child_ops.to_get_current_exception_event = child_get_current_exception_event; |
| deprecated_child_ops.to_pid_to_exec_file = child_pid_to_exec_file; |
| deprecated_child_ops.to_stratum = process_stratum; |
| deprecated_child_ops.to_has_all_memory = 1; |
| deprecated_child_ops.to_has_memory = 1; |
| deprecated_child_ops.to_has_stack = 1; |
| deprecated_child_ops.to_has_registers = 1; |
| deprecated_child_ops.to_has_execution = 1; |
| deprecated_child_ops.to_magic = OPS_MAGIC; |
| } |
| |
| void |
| _initialize_inftarg (void) |
| { |
| #ifdef HAVE_OPTIONAL_PROC_FS |
| char procname[32]; |
| int fd; |
| |
| /* If we have an optional /proc filesystem (e.g. under OSF/1), |
| don't add ptrace support if we can access the running GDB via /proc. */ |
| #ifndef PROC_NAME_FMT |
| #define PROC_NAME_FMT "/proc/%05d" |
| #endif |
| sprintf (procname, PROC_NAME_FMT, getpid ()); |
| fd = open (procname, O_RDONLY); |
| if (fd >= 0) |
| { |
| close (fd); |
| return; |
| } |
| #endif |
| |
| init_child_ops (); |
| add_target (&deprecated_child_ops); |
| } |