darling-gdb/gdb/fork-child.c
Pedro Alves 6c95b8df7f 2009-10-19 Pedro Alves <pedro@codesourcery.com>
Stan Shebs	<stan@codesourcery.com>

	Add base multi-executable/process support to GDB.

	gdb/
	* Makefile.in (SFILES): Add progspace.c.
	(COMMON_OBS): Add progspace.o.
	* progspace.h: New.
	* progspace.c: New.

	* breakpoint.h (struct bp_target_info) <placed_address_space>: New
	field.
	(struct bp_location) <pspace>: New field.
	(struct breakpoint) <pspace>: New field.
	(bpstat_stop_status, breakpoint_here_p)
	(moribund_breakpoint_here_p, breakpoint_inserted_here_p)
	(regular_breakpoint_inserted_here_p)
	(software_breakpoint_inserted_here_p, breakpoint_thread_match)
	(set_default_breakpoint): Adjust prototypes.
	(remove_breakpoints_pid, breakpoint_program_space_exit): Declare.
	(insert_single_step_breakpoint, deprecated_insert_raw_breakpoint):
	Adjust prototypes.
	* breakpoint.c (executing_startup): Delete.
	(default_breakpoint_sspace): New.
	(breakpoint_restore_shadows): Skip if the address space doesn't
	match.
	(update_watchpoint): Record the frame's program space in the
	breakpoint location.
	(insert_bp_location): Record the address space in target_info.
	Adjust to pass the symbol space to solib_name_from_address.
	(breakpoint_program_space_exit): New.
	(insert_breakpoint_locations): Switch the symbol space and thread
	when inserting breakpoints.  Don't insert breakpoints in a vfork
	parent waiting for vfork done if we're not attached to the vfork
	child.
	(remove_breakpoints_pid): New.
	(reattach_breakpoints): Switch to a thread of PID.  Ignore
	breakpoints of other symbol spaces.
	(create_internal_breakpoint): Store the symbol space in the sal.
	(create_longjmp_master_breakpoint): Iterate over all symbol
	spaces.
	(update_breakpoints_after_exec): Ignore breakpoints for other
	symbol spaces.
	(remove_breakpoint): Rename to ...
	(remove_breakpoint_1): ... this.  Pass the breakpoints symbol
	space to solib_name_from_address.
	(remove_breakpoint): New.
	(mark_breakpoints_out): Ignore breakpoints from other symbol
	spaces.
	(breakpoint_init_inferior): Ditto.
	(breakpoint_here_p): Add an address space argument and adjust to
	use breakpoint_address_match.
	(moribund_breakpoint_here_p): Ditto.
	(regular_breakpoint_inserted_here_p): Ditto.
	(breakpoint_inserted_here_p): Ditto.
	(software_breakpoint_inserted_here_p): Ditto.
	(breakpoint_thread_match): Ditto.
	(bpstat_check_location): Ditto.
	(bpstat_stop_status): Ditto.
	(print_breakpoint_location): If there's a location to print,
	switch the current symbol space.
	(print_one_breakpoint_location): Add `allflag' argument.
	(print_one_breakpoint): Ditto.	Adjust.
	(do_captured_breakpoint_query): Adjust.
	(breakpoint_1): Adjust.
	(breakpoint_has_pc): Also match the symbol space.
	(describe_other_breakpoints): Add a symbol space argument and
	adjust.
	(set_default_breakpoint): Add a symbol space argument.	Set
	default_breakpoint_sspace.
	(breakpoint_address_match): New.
	(check_duplicates_for): Add an address space argument, and adjust.
	(set_raw_breakpoint): Record the symbol space in the location and
	in the breakpoint.
	(set_longjmp_breakpoint): Skip longjmp master breakpoints from
	other symbol spaces.
	(remove_thread_event_breakpoints, remove_solib_event_breakpoints)
	(disable_breakpoints_in_shlibs): Skip breakpoints from other
	symbol spaces.
	(disable_breakpoints_in_unloaded_shlib): Match symbol spaces.
	(create_catchpoint): Set the symbol space in the sal.
	(disable_breakpoints_before_startup): Skip breakpoints from other
	symbol spaces.	Set executing_startup in the current symbol space.
	(enable_breakpoints_after_startup): Clear executing_startup in the
	current symbol space.  Skip breakpoints from other symbol spaces.
	(clone_momentary_breakpoint): Also copy the symbol space.
	(add_location_to_breakpoint): Set the location's symbol space.
	(bp_loc_is_permanent): Switch thread and symbol space.
	(create_breakpoint): Adjust.
	(expand_line_sal_maybe): Expand comment to mention symbol spaces.
	Switch thread and symbol space when reading memory.
	(parse_breakpoint_sals): Set the symbol space in the sal.
	(break_command_really): Ditto.
	(skip_prologue_sal): Switch and space.
	(resolve_sal_pc): Ditto.
	(watch_command_1): Record the symbol space in the sal.
	(create_ada_exception_breakpoint): Adjust.
	(clear_command): Adjust.  Match symbol spaces.
	(update_global_location_list): Use breakpoint_address_match.
	(breakpoint_re_set_one): Switch thread and space.
	(breakpoint_re_set): Save symbol space.
	(breakpoint_re_set_thread): Also reset the symbol space.
	(deprecated_insert_raw_breakpoint): Add an address space argument.
	Adjust.
	(insert_single_step_breakpoint): Ditto.
	(single_step_breakpoint_inserted_here_p): Ditto.
	(clear_syscall_counts): New.
	(_initialize_breakpoint): Install it as inferior_exit observer.

	* exec.h: Include "progspace.h".
	(exec_bfd, exec_bfd_mtime): New defines.
	(exec_close): Declare.
	* exec.c: Include "gdbthread.h" and "progspace.h".
	(exec_bfd, exec_bfd_mtime, current_target_sections_1): Delete.
	(using_exec_ops): New.
	(exec_close_1): Rename to exec_close, and make public.
	(exec_close): Rename to exec_close_1, and adjust all callers.  Add
	description.  Remove target sections and close executables from
	all program spaces.
	(exec_file_attach): Add comment.
	(add_target_sections): Check on `using_exec_ops' to check if the
	target should be pushed.
	(remove_target_sections): Only unpush the target if there are no
	more target sections in any symbol space.
	* gdbcore.h: Include "exec.h".
	(exec_bfd, exec_bfd_mtime): Remove declarations.

	* frame.h (get_frame_program_space, get_frame_address_space)
	(frame_unwind_program_space): Declare.
	* frame.c (struct frame_info) <pspace, aspace>: New fields.
	(create_sentinel_frame): Add program space argument.  Set the
	pspace and aspace fields of the frame object.
	(get_current_frame, create_new_frame): Adjust.
	(get_frame_program_space): New.
	(frame_unwind_program_space): New.
	(get_frame_address_space): New.
	* stack.c (print_frame_info): Adjust.
	(print_frame): Use the frame's program space.

	* gdbthread.h (any_live_thread_of_process): Declare.
	* thread.c (any_live_thread_of_process): New.
	(switch_to_thread): Switch the program space as well.
	(restore_selected_frame): Don't warn if trying to restore frame
	level 0.

	* inferior.h: Include "progspace.h".
	(detach_fork): Declare.
	(struct inferior) <removable, aspace, pspace>
	<vfork_parent, vfork_child, pending_detach>
	<waiting_for_vfork_done>: New fields.
	<terminal_info>: Remove field.
	<data, num_data>: New fields.
	(register_inferior_data, register_inferior_data_with_cleanup)
	(clear_inferior_data, set_inferior_data, inferior_data): Declare.
	(exit_inferior, exit_inferior_silent, exit_inferior_num_silent)
	(inferior_appeared): Declare.
	(find_inferior_pid): Typo.
	(find_inferior_id, find_inferior_for_program_space): Declare.
	(set_current_inferior, save_current_inferior, prune_inferiors)
	(number_of_inferiors): Declare.
	(inferior_list): Declare.
	* inferior.c: Include "gdbcore.h" and "symfile.h".
	(inferior_list): Make public.
	(delete_inferior_1): Always delete thread silently.
	(find_inferior_id): Make public.
	(current_inferior_): New.
	(current_inferior): Use it.
	(set_current_inferior): New.
	(restore_inferior): New.
	(save_current_inferior): New.
	(free_inferior): Free the per-inferior data.
	(add_inferior_silent): Allocate per-inferior data.
	Call inferior_appeared.
	(delete_threads_of_inferior): New.
	(delete_inferior_1): Adjust interface to take an inferior pointer.
	(delete_inferior): Adjust.
	(delete_inferior_silent): Adjust.
	(exit_inferior_1): New.
	(exit_inferior): New.
	(exit_inferior_silent): New.
	(exit_inferior_num_silent): New.
	(detach_inferior): Adjust.
	(inferior_appeared): New.
	(discard_all_inferiors): Adjust.
	(find_inferior_id): Make public.  Assert pid is not zero.
	(find_inferior_for_program_space): New.
	(have_inferiors): Check if we have any inferior with pid not zero.
	(have_live_inferiors): Go over all pushed targets looking for
	process_stratum.
	(prune_inferiors): New.
	(number_of_inferiors): New.
	(print_inferior): Add executable column.  Print vfork parent/child
	relationships.
	(inferior_command): Adjust to cope with not running inferiors.
	(remove_inferior_command): New.
	(add_inferior_command): New.
	(clone_inferior_command): New.
	(struct inferior_data): New.
	(struct inferior_data_registration): New.
	(struct inferior_data_registry): New.
	(inferior_data_registry): New.
	(register_inferior_data_with_cleanup): New.
	(register_inferior_data): New.
	(inferior_alloc_data): New.
	(inferior_free_data): New.
	(clear_inferior_data): New.
	(set_inferior_data): New.
	(inferior_data): New.
	(initialize_inferiors): New.
	(_initialize_inferiors): Register "add-inferior",
	"remove-inferior" and "clone-inferior" commands.

	* objfiles.h: Include "progspace.h".
	(struct objfile) <pspace>: New field.
	(symfile_objfile, object_files): Don't declare.
	(ALL_PSPACE_OBJFILES): New.
	(ALL_PSPACE_OBJFILES_SAFE): New.
	(ALL_OBJFILES, ALL_OBJFILES_SAFE): Adjust.
	(ALL_PSPACE_SYMTABS): New.
	(ALL_PRIMARY_SYMTABS): Adjust.
	(ALL_PSPACE_PRIMARY_SYMTABS): New.
	(ALL_PSYMTABS): Adjust.
	(ALL_PSPACE_PSYMTABS): New.
	* objfiles.c (object_files, symfile_objfile): Delete.
	(struct objfile_sspace_info): New.
	(objfiles_pspace_data): New.
	(objfiles_pspace_data_cleanup): New.
	(get_objfile_pspace_data): New.
	(objfiles_changed_p): Delete.
	(allocate_objfile): Set the objfile's program space.  Adjust to
	reference objfiles_changed_p in pspace data.
	(free_objfile): Adjust to reference objfiles_changed_p in pspace
	data.
	(objfile_relocate): Ditto.
	(update_section_map): Add pspace argument.  Adjust to iterate over
	objfiles in the passed in pspace.
	(find_pc_section): Delete sections and num_sections statics.
	Adjust to refer to program space's objfiles_changed_p.	Adjust to
	refer to sections and num_sections store in the objfile's pspace
	data.
	(objfiles_changed): Adjust to reference objfiles_changed_p in
	pspace data.
	(_initialize_objfiles): New.
	* linespec.c (decode_all_digits, decode_dollar): Set the sal's
	program space.
	* source.c (current_source_pspace): New.
	(get_current_source_symtab_and_line): Set the sal's program space.
	(set_current_source_symtab_and_line): Set current_source_pspace.
	(select_source_symtab): Ditto.	Use ALL_OBJFILES.
	(forget_cached_source_info): Iterate over all program spaces.
	* symfile.c (clear_symtab_users): Adjust.
	* symmisc.c (print_symbol_bcache_statistics): Iterate over all
	program spaces.
	(print_objfile_statistics): Ditto.
	(maintenance_print_msymbols): Ditto.
	(maintenance_print_objfiles): Ditto.
	(maintenance_info_symtabs): Ditto.
	(maintenance_info_psymtabs): Ditto.
	* symtab.h (SYMTAB_PSPACE): New.
	(struct symtab_and_line) <pspace>: New field.
	* symtab.c (init_sal): Clear the sal's program space.
	(find_pc_sect_symtab): Set the sal's program space.  Switch thread
	and space.
	(append_expanded_sal): Add program space argument.  Iterate over
	all program spaces.
	(expand_line_sal): Iterate over all program spaces.  Switch
	program space.

	* target.h (enum target_waitkind) <TARGET_WAITKIND_VFORK_DONE>: New.
	(struct target_ops) <to_thread_address_space>: New field.
	(target_thread_address_space): Define.
	* target.c (target_detach): Only remove breakpoints from the
	inferior we're detaching.
	(target_thread_address_space): New.

	* defs.h (initialize_progspace): Declare.
	* top.c (gdb_init): Call it.

	* solist.h (struct so_list) <sspace>: New field.
	* solib.h (struct program_space): Forward declare.
	(solib_name_from_address): Adjust prototype.
	* solib.c (so_list_head): Replace with a macro referencing the
	program space.
	(update_solib_list): Set the so's program space.
	(solib_name_from_address): Add a program space argument and adjust.

	* solib-svr4.c (struct svr4_info) <pid>: Delete field.
	<interp_text_sect_low, interp_text_sect_high, interp_plt_sect_low>
	<interp_plt_sect_high>: New fields.
	(svr4_info_p, svr4_info): Delete.
	(solib_svr4_sspace_data): New.
	(get_svr4_info): Rewrite.
	(svr4_sspace_data_cleanup): New.
	(open_symbol_file_object): Adjust.
	(svr4_default_sos): Adjust.
	(svr4_fetch_objfile_link_map): Adjust.
	(interp_text_sect_low, interp_text_sect_high, interp_plt_sect_low)
	(interp_plt_sect_high): Delete.
	(svr4_in_dynsym_resolve_code): Adjust.
	(enable_break): Adjust.
	(svr4_clear_solib): Revert bit that removed the svr4_info here,
	and reinstate clearing debug_base, debug_loader_offset_p,
	debug_loader_offset and debug_loader_name.
	(_initialize_svr4_solib): Register solib_svr4_pspace_data.  Don't
	install an inferior_exit observer anymore.

	* printcmd.c (struct display) <pspace>: New field.
	(display_command): Set the display's sspace.
	(do_one_display): Match the display's sspace.
	(display_uses_solib_p): Ditto.

	* linux-fork.c (detach_fork): Moved to infrun.c.
	(_initialize_linux_fork): Moved "detach-on-fork" command to
	infrun.c.
	* infrun.c (detach_fork): Moved from linux-fork.c.
	(proceed_after_vfork_done): New.
	(handle_vfork_child_exec_or_exit): New.
	(follow_exec_mode_replace, follow_exec_mode_keep)
	(follow_exec_mode_names, follow_exec_mode_string)
	(show_follow_exec_mode_string): New.
	(follow_exec): New.  Reinstate the mark_breakpoints_out call.
	Remove shared libraries before attaching new executable.  If user
	wants to keep the inferior, keep it.
	(displaced_step_fixup): Adjust to pass an address space to the
	breakpoints module.
	(resume): Ditto.
	(clear_proceed_status): In all-stop mode, always clear the proceed
	status of all threads.
	(prepare_to_proceed): Adjust to pass an address space to the
	breakpoints module.
	(proceed): Ditto.
	(adjust_pc_after_break): Ditto.
	(handle_inferior_event): When handling a process exit, switch the
	program space to the inferior's that had exited.  Call
	handle_vfork_child_exec_or_exit.  Adjust to pass an address space
	to the breakpoints module.  In non-stop mode, when following a
	fork and detach-fork is off, also resume the other branch.  Handle
	TARGET_WAITKIND_VFORK_DONE.  Set the program space in sals.
	(normal_stop): Prune inferiors.
	(_initialize_infrun): Install the new "follow-exec-mode" command.
	"detach-on-fork" moved here.

	* regcache.h (get_regcache_aspace): Declare.
	* regcache.c (struct regcache) <aspace>: New field.
	(regcache_xmalloc): Clear the aspace.
	(get_regcache_aspace): New.
	(regcache_cpy): Copy the aspace field.
	(regcache_cpy_no_passthrough): Ditto.
	(get_thread_regcache): Fetch the thread's address space from the
	target, and store it in the regcache.

	* infcall.c (call_function_by_hand): Set the sal's pspace.

	* arch-utils.c (default_has_shared_address_space): New.
	* arch-utils.h (default_has_shared_address_space): Declare.

	* gdbarch.sh (has_shared_address_space): New.
	* gdbarch.h, gdbarch.c: Regenerate.

	* linux-tdep.c: Include auxv.h, target.h, elf/common.h.
	(linux_has_shared_address_space): New.
	(_initialize_linux_tdep): Declare.

	* arm-tdep.c (arm_software_single_step): Pass the frame's address
	space to insert_single_step_breakpoint.
	* arm-linux-tdep.c (arm_linux_software_single_step): Pass the
	frame's pspace to breakpoint functions.
	* cris-tdep.c (crisv32_single_step_through_delay): Ditto.
	(cris_software_single_step): Ditto.
	* mips-tdep.c (deal_with_atomic_sequence): Add frame argument.
	Pass the frame's pspace to breakpoint functions.
	(mips_software_single_step): Adjust.
	(mips_single_step_through_delay): Adjust.
	* rs6000-aix-tdep.c (rs6000_software_single_step): Adjust.
	* rs6000-tdep.c (ppc_deal_with_atomic_sequence): Adjust.
	* solib-irix.c (enable_break): Adjust to pass the current frame's
	address space to breakpoint functions.
	* sparc-tdep.c (sparc_software_single_step): Ditto.
	* spu-tdep.c (spu_software_single_step): Ditto.
	* alpha-tdep.c (alpha_software_single_step): Ditto.
	* record.c (record_wait): Adjust to pass an address space to the
	breakpoints module.

	* fork-child.c (fork_inferior): Set the new inferior's program and
	address spaces.
	* inf-ptrace.c (inf_ptrace_follow_fork): Copy the parent's program
	and address spaces.
	(inf_ptrace_attach): Set the inferior's program and address spaces.
	* linux-nat.c: Include "solib.h".
	(linux_child_follow_fork): Manage parent and child's program and
	address spaces.	 Clone the parent's program space if necessary.
	Don't wait for the vfork to be done here.  Refuse to resume if
	following the vfork parent while leaving the child stopped.
	(resume_callback): Don't resume a vfork parent.
	(linux_nat_resume): Also check for pending events in the
	lp->waitstatus field.
	(linux_handle_extended_wait): Report TARGET_WAITKIND_VFORK_DONE
	events to the core.
	(stop_wait_callback): Don't wait for SIGSTOP on vfork parents.
	(cancel_breakpoint): Adjust.
	* linux-thread-db.c (thread_db_wait): Don't remove thread event
	breakpoints here.
	(thread_db_mourn_inferior): Don't mark breakpoints out here.
	Remove thread event breakpoints after mourning.
	* corelow.c: Include progspace.h.
	(core_open): Set the inferior's program and address spaces.
	* remote.c (remote_add_inferior): Set the new inferior's program
	and address spaces.
	(remote_start_remote): Update address spaces.
	(extended_remote_create_inferior_1): Don't init the thread list if
	we already debugging other inferiors.
	* darwin-nat.c (darwin_attach): Set the new inferior's program and
	address spaces.
	* gnu-nat.c (gnu_attach): Ditto.
	* go32-nat.c (go32_create_inferior): Ditto.
	* inf-ttrace.c (inf_ttrace_follow_fork, inf_ttrace_attach): Ditto.
	* monitor.c (monitor_open): Ditto.
	* nto-procfs.c (procfs_attach, procfs_create_inferior): Ditto.
	* procfs.c (do_attach): Ditto.
	* windows-nat.c (do_initial_windows_stuff): Ditto.

	* inflow.c (inferior_process_group)
	(terminal_init_inferior_with_pgrp, terminal_inferior,
	(terminal_ours_1, inflow_inferior_exit, copy_terminal_info)
	(child_terminal_info, new_tty_postfork, set_sigint_trap): Adjust
	to use per-inferior data instead of inferior->terminal_info.
	(inflow_inferior_data): New.
	(inflow_new_inferior): Delete.
	(inflow_inferior_data_cleanup): New.
	(get_inflow_inferior_data): New.

	* mi/mi-interp.c (mi_new_inferior): Rename to...
	(mi_inferior_appeared): ... this.
	(mi_interpreter_init): Adjust.

	* tui/tui-disasm.c: Include "progspace.h".
	(tui_set_disassem_content): Pass an address space to
	breakpoint_here_p.

	* NEWS: Mention multi-program debugging support.  Mention new
	commands "add-inferior", "clone-inferior", "remove-inferior",
	"maint info program-spaces", and new option "set
	follow-exec-mode".

2009-10-19  Pedro Alves	 <pedro@codesourcery.com>
	    Stan Shebs	<stan@codesourcery.com>

	gdb/doc/
	* observer.texi (new_inferior): Rename to...
	(inferior_appeared): ... this.

2009-10-19  Pedro Alves	 <pedro@codesourcery.com>
	    Stan Shebs	<stan@codesourcery.com>

	gdb/testsuite/
	* gdb.base/foll-vfork.exp: Adjust to spell out "follow-fork".
	* gdb.base/foll-exec.exp: Adjust to expect a process id before
	"Executing new program".
	* gdb.base/foll-fork.exp: Adjust to spell out "follow-fork".
	* gdb.base/multi-forks.exp: Ditto.  Adjust to the inferior being
	left listed after having been killed.
	* gdb.base/attach.exp: Adjust to spell out "symbol-file".
	* gdb.base/maint.exp: Adjust test.

	* Makefile.in (ALL_SUBDIRS): Add gdb.multi.
	* gdb.multi/Makefile.in: New.
	* gdb.multi/base.exp: New.
	* gdb.multi/goodbye.c: New.
	* gdb.multi/hangout.c: New.
	* gdb.multi/hello.c: New.
	* gdb.multi/bkpt-multi-exec.c: New.
	* gdb.multi/bkpt-multi-exec.exp: New.
	* gdb.multi/crashme.c: New.

2009-10-19  Pedro Alves	 <pedro@codesourcery.com>
	    Stan Shebs	<stan@codesourcery.com>

	gdb/doc/
	* gdb.texinfo (Inferiors): Rename node to ...
	(Inferiors and Programs): ... this.  Mention running multiple
	programs in the same debug session.
	<info inferiors>: Mention the new 'Executable' column if "info
	inferiors".  Update examples.  Document the "add-inferior",
	"clone-inferior", "remove-inferior" and "maint info
	program-spaces" commands.
	(Process): Rename node to...
	(Forks): ... this.  Document "set|show follow-exec-mode".
2009-10-19 09:51:43 +00:00

567 lines
16 KiB
C

/* Fork a Unix child process, and set up to debug it, for GDB.
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
2001, 2004, 2005, 2006, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdb_string.h"
#include "inferior.h"
#include "terminal.h"
#include "target.h"
#include "gdb_wait.h"
#include "gdb_vfork.h"
#include "gdbcore.h"
#include "terminal.h"
#include "gdbthread.h"
#include "command.h" /* for dont_repeat () */
#include "gdbcmd.h"
#include "solib.h"
#include <signal.h>
/* This just gets used as a default if we can't find SHELL. */
#define SHELL_FILE "/bin/sh"
extern char **environ;
static char *exec_wrapper;
/* Break up SCRATCH into an argument vector suitable for passing to
execvp and store it in ARGV. E.g., on "run a b c d" this routine
would get as input the string "a b c d", and as output it would
fill in ARGV with the four arguments "a", "b", "c", "d". */
static void
breakup_args (char *scratch, char **argv)
{
char *cp = scratch;
for (;;)
{
/* Scan past leading separators */
while (*cp == ' ' || *cp == '\t' || *cp == '\n')
cp++;
/* Break if at end of string. */
if (*cp == '\0')
break;
/* Take an arg. */
*argv++ = cp;
/* Scan for next arg separator. */
cp = strchr (cp, ' ');
if (cp == NULL)
cp = strchr (cp, '\t');
if (cp == NULL)
cp = strchr (cp, '\n');
/* No separators => end of string => break. */
if (cp == NULL)
break;
/* Replace the separator with a terminator. */
*cp++ = '\0';
}
/* Null-terminate the vector. */
*argv = NULL;
}
/* When executing a command under the given shell, return non-zero if
the '!' character should be escaped when embedded in a quoted
command-line argument. */
static int
escape_bang_in_quoted_argument (const char *shell_file)
{
const int shell_file_len = strlen (shell_file);
/* Bang should be escaped only in C Shells. For now, simply check
that the shell name ends with 'csh', which covers at least csh
and tcsh. This should be good enough for now. */
if (shell_file_len < 3)
return 0;
if (shell_file[shell_file_len - 3] == 'c'
&& shell_file[shell_file_len - 2] == 's'
&& shell_file[shell_file_len - 1] == 'h')
return 1;
return 0;
}
/* 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. SHELL_FILE is the shell file, or NULL if we should pick
one. */
/* This function is NOT reentrant. Some of the variables have been
made static to ensure that they survive the vfork call. */
int
fork_inferior (char *exec_file_arg, char *allargs, char **env,
void (*traceme_fun) (void), void (*init_trace_fun) (int),
void (*pre_trace_fun) (void), char *shell_file_arg)
{
int pid;
char *shell_command;
static char default_shell_file[] = SHELL_FILE;
int len;
/* Set debug_fork then attach to the child while it sleeps, to debug. */
static int debug_fork = 0;
/* This is set to the result of setpgrp, which if vforked, will be visible
to you in the parent process. It's only used by humans for debugging. */
static int debug_setpgrp = 657473;
static char *shell_file;
static char *exec_file;
char **save_our_env;
int shell = 0;
static char **argv;
const char *inferior_io_terminal = get_inferior_io_terminal ();
struct inferior *inf;
/* If no exec file handed to us, get it from the exec-file command
-- with a good, common error message if none is specified. */
exec_file = exec_file_arg;
if (exec_file == 0)
exec_file = get_exec_file (1);
/* STARTUP_WITH_SHELL is defined in inferior.h. If 0,e we'll just
do a fork/exec, no shell, so don't bother figuring out what
shell. */
shell_file = shell_file_arg;
if (STARTUP_WITH_SHELL)
{
/* Figure out what shell to start up the user program under. */
if (shell_file == NULL)
shell_file = getenv ("SHELL");
if (shell_file == NULL)
shell_file = default_shell_file;
shell = 1;
}
/* Multiplying the length of exec_file by 4 is to account for the
fact that it may expand when quoted; it is a worst-case number
based on every character being '. */
len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop */ 12;
if (exec_wrapper)
len += strlen (exec_wrapper) + 1;
shell_command = (char *) alloca (len);
shell_command[0] = '\0';
if (!shell)
{
/* We're going to call execvp. Create argument vector.
Calculate an upper bound on the length of the vector by
assuming that every other character is a separate
argument. */
int argc = (strlen (allargs) + 1) / 2 + 2;
argv = (char **) xmalloc (argc * sizeof (*argv));
argv[0] = exec_file;
breakup_args (allargs, &argv[1]);
}
else
{
/* We're going to call a shell. */
char *p;
int need_to_quote;
const int escape_bang = escape_bang_in_quoted_argument (shell_file);
strcat (shell_command, "exec ");
/* Add any exec wrapper. That may be a program name with arguments, so
the user must handle quoting. */
if (exec_wrapper)
{
strcat (shell_command, exec_wrapper);
strcat (shell_command, " ");
}
/* Now add exec_file, quoting as necessary. */
/* Quoting in this style is said to work with all shells. But
csh on IRIX 4.0.1 can't deal with it. So we only quote it if
we need to. */
p = exec_file;
while (1)
{
switch (*p)
{
case '\'':
case '!':
case '"':
case '(':
case ')':
case '$':
case '&':
case ';':
case '<':
case '>':
case ' ':
case '\n':
case '\t':
need_to_quote = 1;
goto end_scan;
case '\0':
need_to_quote = 0;
goto end_scan;
default:
break;
}
++p;
}
end_scan:
if (need_to_quote)
{
strcat (shell_command, "'");
for (p = exec_file; *p != '\0'; ++p)
{
if (*p == '\'')
strcat (shell_command, "'\\''");
else if (*p == '!' && escape_bang)
strcat (shell_command, "\\!");
else
strncat (shell_command, p, 1);
}
strcat (shell_command, "'");
}
else
strcat (shell_command, exec_file);
strcat (shell_command, " ");
strcat (shell_command, allargs);
}
/* On some systems an exec will fail if the executable is open. */
close_exec_file ();
/* Retain a copy of our environment variables, since the child will
replace the value of environ and if we're vforked, we have to
restore it. */
save_our_env = environ;
/* Tell the terminal handling subsystem what tty we plan to run on;
it will just record the information for later. */
new_tty_prefork (inferior_io_terminal);
/* It is generally good practice to flush any possible pending stdio
output prior to doing a fork, to avoid the possibility of both
the parent and child flushing the same data after the fork. */
gdb_flush (gdb_stdout);
gdb_flush (gdb_stderr);
/* If there's any initialization of the target layers that must
happen to prepare to handle the child we're about fork, do it
now... */
if (pre_trace_fun != NULL)
(*pre_trace_fun) ();
/* Create the child process. Since the child process is going to
exec(3) shortly afterwards, try to reduce the overhead by
calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's
likely that this optimization won't work since there's too much
work to do between the vfork(2) and the exec(3). This is known
to be the case on ttrace(2)-based HP-UX, where some handshaking
between parent and child needs to happen between fork(2) and
exec(2). However, since the parent is suspended in the vforked
state, this doesn't work. Also note that the vfork(2) call might
actually be a call to fork(2) due to the fact that autoconf will
``#define vfork fork'' on certain platforms. */
if (pre_trace_fun || debug_fork)
pid = fork ();
else
pid = vfork ();
if (pid < 0)
perror_with_name (("vfork"));
if (pid == 0)
{
if (debug_fork)
sleep (debug_fork);
/* Create a new session for the inferior process, if necessary.
It will also place the inferior in a separate process group. */
if (create_tty_session () <= 0)
{
/* No session was created, but we still want to run the inferior
in a separate process group. */
debug_setpgrp = gdb_setpgid ();
if (debug_setpgrp == -1)
perror ("setpgrp failed in child");
}
/* Ask the tty subsystem to switch to the one we specified
earlier (or to share the current terminal, if none was
specified). */
new_tty ();
/* Changing the signal handlers for the inferior after
a vfork can also change them for the superior, so we don't mess
with signals here. See comments in
initialize_signals for how we get the right signal handlers
for the inferior. */
/* "Trace me, Dr. Memory!" */
(*traceme_fun) ();
/* The call above set this process (the "child") as debuggable
by the original gdb process (the "parent"). Since processes
(unlike people) can have only one parent, if you are debugging
gdb itself (and your debugger is thus _already_ the
controller/parent for this child), code from here on out is
undebuggable. Indeed, you probably got an error message
saying "not parent". Sorry; you'll have to use print
statements! */
/* There is no execlpe call, so we have to set the environment
for our child in the global variable. If we've vforked, this
clobbers the parent, but environ is restored a few lines down
in the parent. By the way, yes we do need to look down the
path to find $SHELL. Rich Pixley says so, and I agree. */
environ = env;
/* If we decided above to start up with a shell, we exec the
shell, "-c" says to interpret the next arg as a shell command
to execute, and this command is "exec <target-program>
<args>". */
if (shell)
{
execlp (shell_file, shell_file, "-c", shell_command, (char *) 0);
/* If we get here, it's an error. */
fprintf_unfiltered (gdb_stderr, "Cannot exec %s: %s.\n", shell_file,
safe_strerror (errno));
gdb_flush (gdb_stderr);
_exit (0177);
}
else
{
/* Otherwise, we directly exec the target program with
execvp. */
int i;
char *errstring;
execvp (exec_file, argv);
/* If we get here, it's an error. */
errstring = safe_strerror (errno);
fprintf_unfiltered (gdb_stderr, "Cannot exec %s ", exec_file);
i = 1;
while (argv[i] != NULL)
{
if (i != 1)
fprintf_unfiltered (gdb_stderr, " ");
fprintf_unfiltered (gdb_stderr, "%s", argv[i]);
i++;
}
fprintf_unfiltered (gdb_stderr, ".\n");
#if 0
/* This extra info seems to be useless. */
fprintf_unfiltered (gdb_stderr, "Got error %s.\n", errstring);
#endif
gdb_flush (gdb_stderr);
_exit (0177);
}
}
/* Restore our environment in case a vforked child clob'd it. */
environ = save_our_env;
if (!have_inferiors ())
init_thread_list ();
inf = current_inferior ();
inferior_appeared (inf, pid);
/* Needed for wait_for_inferior stuff below. */
inferior_ptid = pid_to_ptid (pid);
new_tty_postfork ();
/* We have something that executes now. We'll be running through
the shell at this point, but the pid shouldn't change. Targets
supporting MT should fill this task's ptid with more data as soon
as they can. */
add_thread_silent (inferior_ptid);
/* Now that we have a child process, make it our target, and
initialize anything target-vector-specific that needs
initializing. */
if (init_trace_fun)
(*init_trace_fun) (pid);
/* We are now in the child process of interest, having exec'd the
correct program, and are poised at the first instruction of the
new program. */
return pid;
}
/* Accept NTRAPS traps from the inferior. */
void
startup_inferior (int ntraps)
{
int pending_execs = ntraps;
int terminal_initted = 0;
ptid_t resume_ptid;
if (target_supports_multi_process ())
resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
else
resume_ptid = minus_one_ptid;
/* The process was started by the fork that created it, but it will
have stopped one instruction after execing the shell. Here we
must get it up to actual execution of the real program. */
if (exec_wrapper)
pending_execs++;
while (1)
{
int resume_signal = TARGET_SIGNAL_0;
ptid_t event_ptid;
struct target_waitstatus ws;
memset (&ws, 0, sizeof (ws));
event_ptid = target_wait (resume_ptid, &ws, 0);
if (ws.kind == TARGET_WAITKIND_IGNORE)
/* The inferior didn't really stop, keep waiting. */
continue;
switch (ws.kind)
{
case TARGET_WAITKIND_SPURIOUS:
case TARGET_WAITKIND_LOADED:
case TARGET_WAITKIND_FORKED:
case TARGET_WAITKIND_VFORKED:
case TARGET_WAITKIND_SYSCALL_ENTRY:
case TARGET_WAITKIND_SYSCALL_RETURN:
/* Ignore gracefully during startup of the inferior. */
switch_to_thread (event_ptid);
break;
case TARGET_WAITKIND_SIGNALLED:
target_terminal_ours ();
target_mourn_inferior ();
error (_("During startup program terminated with signal %s, %s."),
target_signal_to_name (ws.value.sig),
target_signal_to_string (ws.value.sig));
return;
case TARGET_WAITKIND_EXITED:
target_terminal_ours ();
target_mourn_inferior ();
if (ws.value.integer)
error (_("During startup program exited with code %d."),
ws.value.integer);
else
error (_("During startup program exited normally."));
return;
case TARGET_WAITKIND_EXECD:
/* Handle EXEC signals as if they were SIGTRAP signals. */
xfree (ws.value.execd_pathname);
resume_signal = TARGET_SIGNAL_TRAP;
switch_to_thread (event_ptid);
break;
case TARGET_WAITKIND_STOPPED:
resume_signal = ws.value.sig;
switch_to_thread (event_ptid);
break;
}
if (resume_signal != TARGET_SIGNAL_TRAP)
{
/* Let shell child handle its own signals in its own way. */
target_resume (resume_ptid, 0, resume_signal);
}
else
{
/* We handle SIGTRAP, however; it means child did an exec. */
if (!terminal_initted)
{
/* Now that the child has exec'd we know it has already
set its process group. On POSIX systems, tcsetpgrp
will fail with EPERM if we try it before the child's
setpgid. */
/* Set up the "saved terminal modes" of the inferior
based on what modes we are starting it with. */
target_terminal_init ();
/* Install inferior's terminal modes. */
target_terminal_inferior ();
terminal_initted = 1;
}
if (--pending_execs == 0)
break;
/* Just make it go on. */
target_resume (resume_ptid, 0, TARGET_SIGNAL_0);
}
}
/* Mark all threads non-executing. */
set_executing (resume_ptid, 0);
}
/* Implement the "unset exec-wrapper" command. */
static void
unset_exec_wrapper_command (char *args, int from_tty)
{
xfree (exec_wrapper);
exec_wrapper = NULL;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_fork_child;
void
_initialize_fork_child (void)
{
add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\
Set a wrapper for running programs.\n\
The wrapper prepares the system and environment for the new program."),
_("\
Show the wrapper for running programs."), NULL,
NULL, NULL,
&setlist, &showlist);
add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command,
_("Disable use of an execution wrapper."),
&unsetlist);
}