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/* Target-vector operations for controlling Unix child processes, for GDB. Copyright 1990, 1991, 1992, 1993, 1994, 1995 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 "command.h" #include <signal.h> #include <sys/types.h> #include <fcntl.h> static void child_prepare_to_store PARAMS ((void)); #ifndef CHILD_WAIT static int child_wait PARAMS ((int, struct target_waitstatus *)); #endif /* CHILD_WAIT */ static void child_open PARAMS ((char *, int)); static void child_files_info PARAMS ((struct target_ops *)); static void child_detach PARAMS ((char *, int)); static void child_attach PARAMS ((char *, int)); static void ptrace_me PARAMS ((void)); static void ptrace_him PARAMS ((int)); static void child_create_inferior PARAMS ((char *, char *, char **)); #ifdef NeXT void #else static void #endif /* NeXT */ child_mourn_inferior PARAMS ((void)); static int child_can_run PARAMS ((void)); extern char **environ; /* Forward declaration */ extern struct target_ops child_ops; #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 int child_wait (pid, ourstatus) int pid; struct target_waitstatus *ourstatus; { int save_errno; int status; do { set_sigint_trap(); /* Causes SIGINT to be passed on to the attached process. */ set_sigio_trap (); pid = proc_wait (inferior_pid, &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 -1; } } while (pid != inferior_pid); /* Some other child died or stopped */ store_waitstatus (ourstatus, status); return pid; } #endif /* CHILD_WAIT */ /* Attach to process PID, then initialize for debugging it. */ static void child_attach (args, from_tty) char *args; int from_tty; { if (!args) error_no_arg ("process-id to attach"); #ifndef ATTACH_DETACH error ("Can't attach to a process on this machine."); #else { char *exec_file; int pid; #ifdef NeXT pid = isdigit (*args) ? atoi (args) : -1; #else pid = atoi (args); #endif /* NeXT */ 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)); else printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid)); gdb_flush (gdb_stdout); } attach (pid); inferior_pid = pid; push_target (&child_ops); #ifdef CREATE_INFERIOR_HOOK /* NeXT added */ { struct cleanup *old_chain = make_cleanup(pop_target, &child_ops); CREATE_INFERIOR_HOOK(args, pid); discard_cleanups(old_chain); } #endif /* CREATE_INFERIOR_HOOK */ } #endif /* ATTACH_DETACH */ } /* 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 (args, from_tty) char *args; int from_tty; { #ifdef ATTACH_DETACH { int siggnal = 0; 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 (inferior_pid)); gdb_flush (gdb_stdout); } if (args) siggnal = atoi (args); detach (siggnal); inferior_pid = 0; unpush_target (&child_ops); } #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 } /* Print status information about what we're accessing. */ static void child_files_info (ignore) struct target_ops *ignore; { printf_unfiltered ("\tUsing the running image of %s %s.\n", attach_flag? "attached": "child", target_pid_to_str (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."); } /* Stub function which causes the inferior that runs it, to be ptrace-able by its parent process. */ static void ptrace_me () { /* "Trace me, Dr. Memory!" */ call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); } /* Stub function which causes the GDB that runs it, to start ptrace-ing the child process. */ static void ptrace_him (pid) int pid; { push_target (&child_ops); #ifdef START_INFERIOR_TRAPS_EXPECTED startup_inferior (START_INFERIOR_TRAPS_EXPECTED); #else /* One trap to exec the shell, one to exec the program being debugged. */ startup_inferior (2); #endif } /* Start an inferior Unix child process and sets inferior_pid 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 (exec_file, allargs, env) char *exec_file; char *allargs; char **env; { fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL); /* We are at the first instruction we care about. */ /* Pedal to the metal... */ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); } #ifdef NeXT void #else static void #endif /* NeXT */ child_mourn_inferior () { unpush_target (&child_ops); proc_remove_foreign (inferior_pid); generic_mourn_inferior (); } static int child_can_run () { return(1); } /* 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). */ void child_stop () { #ifndef NeXT extern pid_t inferior_process_group; #else extern int inferior_process_group; #endif /* NeXT */ kill (-inferior_process_group, SIGINT); } 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 */ 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 */ child_can_run, /* to_can_run */ 0, /* to_notice_signals */ child_stop, /* to_stop */ 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, /* to_sections */ 0, /* to_sections_end */ OPS_MAGIC /* to_magic */ }; void _initialize_inftarg () { #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 ()); if ((fd = open (procname, O_RDONLY)) >= 0) { close (fd); return; } #endif add_target (&child_ops); }
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.