/* 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, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 1990-2017 Free Software Foundation, Inc.
Contributed by Cygnus Support.
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 "filestuff.h"
+#include "top.h"
+#include "signals-state-save-restore.h"
#include <signal.h>
/* This just gets used as a default if we can't find SHELL. */
return 0;
}
+/* See inferior.h. */
+
+void
+trace_start_error (const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start (ap, fmt);
+ fprintf_unfiltered (gdb_stderr, "Could not trace the inferior "
+ "process.\nError: ");
+ vfprintf_unfiltered (gdb_stderr, fmt, ap);
+ va_end (ap);
+
+ gdb_flush (gdb_stderr);
+ _exit (0177);
+}
+
+/* See inferior.h. */
+
+void
+trace_start_error_with_name (const char *string)
+{
+ trace_start_error ("%s: %s", string, safe_strerror (errno));
+}
+
/* 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
struct inferior *inf;
int i;
int save_errno;
+ struct ui *save_ui;
/* If no exec file handed to us, get it from the exec-file command
-- with a good, common error message if none is specified. */
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. */
+ /* 'startup_with_shell' is declared in inferior.h and bound to the
+ "set startup-with-shell" option. 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)
+ if (startup_with_shell)
{
/* Figure out what shell to start up the user program under. */
if (shell_file == NULL)
argument. */
int argc = (strlen (allargs) + 1) / 2 + 2;
- argv = (char **) alloca (argc * sizeof (*argv));
+ argv = XALLOCAVEC (char *, argc);
argv[0] = exec_file;
breakup_args (allargs, &argv[1]);
}
<args>". */
argv = (char **) alloca (4 * sizeof (char *));
argv[0] = shell_file;
- argv[1] = "-c";
+ argv[1] = (char *) "-c";
argv[2] = shell_command;
argv[3] = (char *) 0;
}
- /* 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;
+ /* Likewise the current UI. */
+ save_ui = current_ui;
+
/* 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);
+ gdb_flush (main_ui->m_gdb_stdout);
+ gdb_flush (main_ui->m_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
if (pid == 0)
{
+ /* Switch to the main UI, so that gdb_std{in/out/err} in the
+ child are mapped to std{in/out/err}. This makes it possible
+ to use fprintf_unfiltered/warning/error/etc. in the child
+ from here on. */
+ current_ui = main_ui;
+
+ /* Close all file descriptors except those that gdb inherited
+ (usually 0/1/2), so they don't leak to the inferior. Note
+ that this closes the file descriptors of all secondary
+ UIs. */
+ close_most_fds ();
+
if (debug_fork)
sleep (debug_fork);
saying "not parent". Sorry; you'll have to use print
statements! */
+ restore_original_signals_state ();
+
/* 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
/* If we get here, it's an error. */
save_errno = errno;
- fprintf_unfiltered (gdb_stderr, "Cannot exec %s", exec_file);
+ fprintf_unfiltered (gdb_stderr, "Cannot exec %s", argv[0]);
for (i = 1; argv[i] != NULL; i++)
fprintf_unfiltered (gdb_stderr, " %s", argv[i]);
fprintf_unfiltered (gdb_stderr, ".\n");
/* Restore our environment in case a vforked child clob'd it. */
environ = save_our_env;
+ /* Likewise the current UI. */
+ current_ui = save_ui;
+
if (!have_inferiors ())
init_thread_list ();
int terminal_initted = 0;
ptid_t resume_ptid;
+ if (startup_with_shell)
+ {
+ /* One trap extra for exec'ing the shell. */
+ pending_execs++;
+ }
+
if (target_supports_multi_process ())
resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
else
while (1)
{
- enum target_signal resume_signal = TARGET_SIGNAL_0;
+ enum gdb_signal resume_signal = GDB_SIGNAL_0;
ptid_t event_ptid;
struct target_waitstatus ws;
case TARGET_WAITKIND_SIGNALLED:
target_terminal_ours ();
- target_mourn_inferior ();
+ target_mourn_inferior (event_ptid);
error (_("During startup program terminated with signal %s, %s."),
- target_signal_to_name (ws.value.sig),
- target_signal_to_string (ws.value.sig));
+ gdb_signal_to_name (ws.value.sig),
+ gdb_signal_to_string (ws.value.sig));
return;
case TARGET_WAITKIND_EXITED:
target_terminal_ours ();
- target_mourn_inferior ();
+ target_mourn_inferior (event_ptid);
if (ws.value.integer)
error (_("During startup program exited with code %d."),
ws.value.integer);
case TARGET_WAITKIND_EXECD:
/* Handle EXEC signals as if they were SIGTRAP signals. */
xfree (ws.value.execd_pathname);
- resume_signal = TARGET_SIGNAL_TRAP;
+ resume_signal = GDB_SIGNAL_TRAP;
switch_to_thread (event_ptid);
break;
break;
}
- if (resume_signal != TARGET_SIGNAL_TRAP)
+ if (resume_signal != GDB_SIGNAL_TRAP)
{
/* Let shell child handle its own signals in its own way. */
- target_resume (resume_ptid, 0, resume_signal);
+ target_continue (resume_ptid, resume_signal);
}
else
{
break;
/* Just make it go on. */
- target_resume (resume_ptid, 0, TARGET_SIGNAL_0);
+ target_continue_no_signal (resume_ptid);
}
}
exec_wrapper = NULL;
}
+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);
+}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_fork_child;
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