/* Fork a Unix child process, and set up to debug it, for GDB.
- Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
- 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 1990-2020 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
+ 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,
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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
-#include "frame.h" /* required by inferior.h */
#include "inferior.h"
-#include "target.h"
-#include "gdb_wait.h"
-#include "gdb_vfork.h"
-#include "gdbcore.h"
+#include "gdbcmd.h"
#include "terminal.h"
#include "gdbthread.h"
-#include "command.h" /* for dont_repeat () */
+#include "top.h"
+#include "gdbsupport/job-control.h"
+#include "gdbsupport/filestuff.h"
+#include "nat/fork-inferior.h"
+#include "gdbsupport/common-inferior.h"
-#include <signal.h>
+/* The exec-wrapper, if any, that will be used when starting the
+ inferior. */
-/* This just gets used as a default if we can't find SHELL */
-#ifndef SHELL_FILE
-#define SHELL_FILE "/bin/sh"
-#endif
+static char *exec_wrapper = NULL;
-extern char **environ;
+/* See gdbsupport/common-inferior.h. */
-/* This function breaks up an argument string into an argument
- * vector suitable for passing to execvp().
- * 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)
+const char *
+get_exec_wrapper ()
{
- 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';
- }
+ return exec_wrapper;
+}
- /* execv requires a null-terminated arg vector */
- *argv = NULL;
+/* See nat/fork-inferior.h. */
+void
+gdb_flush_out_err ()
+{
+ gdb_flush (main_ui->m_gdb_stdout);
+ gdb_flush (main_ui->m_gdb_stderr);
}
+/* The ui structure that will be saved on 'prefork_hook' and
+ restored on 'postfork_hook'. */
+static struct ui *saved_ui = NULL;
-/* 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. Errors reported with error(). */
-
-/* This function is NOT-REENTRANT. Some of the variables have been
- made static to ensure that they survive the vfork() call. */
+/* See nat/fork-inferior.h. */
void
-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)
+prefork_hook (const char *args)
{
- 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;
-
- /* 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, 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 desired, concat something onto the front of ALLARGS.
- SHELL_COMMAND is the result. */
-#ifdef SHELL_COMMAND_CONCAT
- shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len);
- strcpy (shell_command, SHELL_COMMAND_CONCAT);
-#else
- shell_command = (char *) alloca (len);
- shell_command[0] = '\0';
-#endif
-
- if (!shell)
- {
- /* We're going to call execvp. Create argv */
- /* Largest case: every other character is a separate arg */
- argv = (char **) xmalloc (((strlen (allargs) + 1) / (unsigned) 2 + 2) * sizeof (*argv));
- argv[0] = exec_file;
- breakup_args (allargs, &argv[1]);
+ const char *inferior_io_terminal = get_inferior_io_terminal ();
- }
- else
- {
+ gdb_assert (saved_ui == NULL);
+ /* Retain a copy of our UI, since the child will replace this value
+ and if we're vforked, we have to restore it. */
+ saved_ui = current_ui;
- /* We're going to call a shell */
-
- /* Now add exec_file, quoting as necessary. */
-
- char *p;
- int need_to_quote;
-
- strcat (shell_command, "exec ");
-
- /* 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 == '!')
- 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);
-
- }
+ /* 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);
+}
- /* exec is said to fail if the executable is open. */
- close_exec_file ();
+/* See nat/fork-inferior.h. */
- /* 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;
+void
+postfork_hook (pid_t pid)
+{
+ inferior *inf = current_inferior ();
- /* Tell the terminal handling subsystem what tty we plan to run on;
- it will just record the information for later. */
+ inferior_appeared (inf, pid);
- new_tty_prefork (inferior_io_terminal);
+ /* Needed for wait_for_inferior stuff. */
+ inferior_ptid = ptid_t (pid);
- /* 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_assert (saved_ui != NULL);
+ current_ui = saved_ui;
+ saved_ui = NULL;
- gdb_flush (gdb_stdout);
- gdb_flush (gdb_stderr);
+ new_tty_postfork ();
+}
- /* 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) ();
+/* See nat/fork-inferior.h. */
- /* Create the child process. Note that the apparent call to vfork()
- below *might* actually be a call to fork() due to the fact that
- autoconf will ``#define vfork fork'' on certain platforms. */
- if (debug_fork)
- pid = fork ();
- else
- pid = vfork ();
+void
+postfork_child_hook ()
+{
+ /* 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;
- if (pid < 0)
- perror_with_name ("vfork");
+ /* Make sure we switch to main_ui here in order to be able to
+ use the fprintf_unfiltered/warning/error functions. */
+ current_ui = main_ui;
- if (pid == 0)
+ /* 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)
{
- if (debug_fork)
- sleep (debug_fork);
-
- /* Run inferior in a separate process group. */
+ /* 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>".
- * "-f" means "fast startup" to the c-shell, which means
- * don't do .cshrc file. Doing .cshrc may cause fork/exec
- * events which will confuse debugger start-up code.
- */
- 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");
- /* This extra info seems to be useless
- fprintf_unfiltered (gdb_stderr, "Got error %s.\n", errstring);
- */
- gdb_flush (gdb_stderr);
- _exit (0177);
- }
+ perror (_("setpgrp failed in child"));
}
- /* Restore our environment in case a vforked child clob'd it. */
- environ = save_our_env;
+ /* Ask the tty subsystem to switch to the one we specified
+ earlier (or to share the current terminal, if none was
+ specified). */
+ new_tty ();
+}
- init_thread_list ();
+/* See inferior.h. */
- inferior_ptid = pid_to_ptid (pid); /* Needed for wait_for_inferior stuff below */
+ptid_t
+gdb_startup_inferior (pid_t pid, int num_traps)
+{
+ inferior *inf = current_inferior ();
+ process_stratum_target *proc_target = inf->process_target ();
- /* Now that we have a child process, make it our target, and
- initialize anything target-vector-specific that needs initializing. */
+ ptid_t ptid = startup_inferior (proc_target, pid, num_traps, NULL, NULL);
- (*init_trace_fun) (pid);
+ /* Mark all threads non-executing. */
+ set_executing (proc_target, ptid, 0);
- /* 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 ptid;
+}
- /* Allow target dependent code to play with the new process. This might be
- used to have target-specific code initialize a variable in the new process
- prior to executing the first instruction. */
- TARGET_CREATE_INFERIOR_HOOK (pid);
+/* Implement the "unset exec-wrapper" command. */
-#ifdef SOLIB_CREATE_INFERIOR_HOOK
- SOLIB_CREATE_INFERIOR_HOOK (pid);
-#endif
+static void
+unset_exec_wrapper_command (const char *args, int from_tty)
+{
+ xfree (exec_wrapper);
+ exec_wrapper = NULL;
}
-/* Accept NTRAPS traps from the inferior. */
+static void
+show_startup_with_shell (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file,
+ _("Use of shell to start subprocesses is %s.\n"),
+ value);
+}
void
-startup_inferior (int ntraps)
+_initialize_fork_child (void)
{
- int pending_execs = ntraps;
- int terminal_initted;
-
- /* 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. */
-
- clear_proceed_status ();
-
- init_wait_for_inferior ();
-
- terminal_initted = 0;
-
- if (STARTUP_WITH_SHELL)
- inferior_ignoring_startup_exec_events = ntraps;
- else
- inferior_ignoring_startup_exec_events = 0;
- inferior_ignoring_leading_exec_events =
- target_reported_exec_events_per_exec_call () - 1;
-
-#ifdef STARTUP_INFERIOR
- STARTUP_INFERIOR (pending_execs);
-#else
- while (1)
- {
- /* Make wait_for_inferior be quiet */
- stop_soon_quietly = STOP_QUIETLY;
- wait_for_inferior ();
- if (stop_signal != TARGET_SIGNAL_TRAP)
- {
- /* Let shell child handle its own signals in its own way */
- /* FIXME, what if child has exit()ed? Must exit loop somehow */
- resume (0, stop_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;
- }
-
- pending_execs = pending_execs - 1;
- if (0 == pending_execs)
- break;
-
- resume (0, TARGET_SIGNAL_0); /* Just make it go on */
- }
- }
-#endif /* STARTUP_INFERIOR */
- stop_soon_quietly = NO_STOP_QUIETLY;
+ 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);
+
+ add_setshow_boolean_cmd ("startup-with-shell", class_support,
+ &startup_with_shell, _("\
+Set use of shell to start subprocesses. The default is on."), _("\
+Show use of shell to start subprocesses."), NULL,
+ NULL,
+ show_startup_with_shell,
+ &setlist, &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff