riscv-gnu-toolchain/gdb.git - Unnamed repository; edit this file 'description' to name the repository.

Age	Commit message (Expand)	Author	Files	Lines
2012-07-27	gdb/	Jan Kratochvil	1	-2/+3
2012-07-26	* copying.c: Rebuild.	Tom Tromey	1	-1/+1
2012-07-26	* symmisc.c (print_symbol_bcache_statistics): Use QUIT, not	Tom Tromey	1	-6/+1
2011-02-14	2011-02-14 Michael Snyder <msnyder@vmware.com>	Michael Snyder	1	-2/+2
2007-08-23	* Makefile.in (copying.c): Use the top-level COPYING3 as the file	Joel Brobecker	1	-282/+620
2005-12-17	* breakpoint.c:	Eli Zaretskii	1	-1/+2
2005-01-29	2005-01-29 Baurzhan Ismagulov <ibr@radix50.net>	Baurzhan Ismagulov	1	-283/+285
2000-07-30	Protoization.	Kevin Buettner	1	-7/+3
2000-05-28	PARAMS removal.	Kevin Buettner	1	-3/+3
1999-04-16	Initial creation of sourceware repositorygdb-4_18-branchpoint	Stan Shebs	1	-0/+327
1999-04-16	Initial creation of sourceware repository	Stan Shebs	1	-336/+0
1997-11-26	* tracepoint.c (set_raw_tracepoint): make sure there's a trailing sla...	Keith Seitz	1	-149/+265
1991-04-26	* empty log message *	Jim Kingdon	1	-6/+9
1991-03-28	Initial revision	K. Richard Pixley	1	-0/+217
1990-09-05	Initial revision	John Gilmore	1	-215/+0
2012-06-03	gdb-3.3	gdb-3.3	1	-0/+215

/* Low level interface to ptrace, for GDB when running under Unix. Copyright (C) 1986-2023 Free Software Foundation, Inc. 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 "frame.h" #include "inferior.h" #include "command.h" #include "serial.h" #include "terminal.h" #include "target.h" #include "gdbthread.h" #include "observable.h" #include <signal.h> #include <fcntl.h> #include "gdbsupport/gdb_select.h" #include "gdbcmd.h" #ifdef HAVE_TERMIOS_H #include <termios.h> #endif #include "gdbsupport/job-control.h" #include "gdbsupport/scoped_ignore_sigttou.h" #ifdef HAVE_SYS_IOCTL_H #include <sys/ioctl.h> #endif #ifndef O_NOCTTY #define O_NOCTTY 0 #endif static void pass_signal (int); static void child_terminal_ours_1 (target_terminal_state); /* Record terminal status separately for debugger and inferior. */ static struct serial *stdin_serial; /* Terminal related info we need to keep track of. Each inferior holds an instance of this structure --- we save it whenever the corresponding inferior stops, and restore it to the terminal when the inferior is resumed in the foreground. */ struct terminal_info { terminal_info () = default; ~terminal_info (); terminal_info &operator= (const terminal_info &) = default; /* The name of the tty (from the `tty' command) that we gave to the inferior when it was started. */ std::string run_terminal; /* TTY state. We save it whenever the inferior stops, and restore it when it resumes in the foreground. */ serial_ttystate ttystate {}; #ifdef HAVE_TERMIOS_H /* The terminal's foreground process group. Saved whenever the inferior stops. This is the pgrp displayed by "info terminal". Note that this may be not the inferior's actual process group, since each inferior that we spawn has its own process group, and only one can be in the foreground at a time. When the inferior resumes, if we can determine the inferior's actual pgrp, then we make that the foreground pgrp instead of what was saved here. While it's a bit arbitrary which inferior's pgrp ends up in the foreground when we resume several inferiors, this at least makes 'resume inf1+inf2' + 'stop all' + 'resume inf2' end up with inf2's pgrp in the foreground instead of inf1's (which would be problematic since it would be left stopped: Ctrl-C wouldn't work, for example). */ pid_t process_group = 0; #endif /* fcntl flags. Saved and restored just like ttystate. */ int tflags = 0; }; /* Our own tty state, which we restore every time we need to deal with the terminal. This is set once, when GDB first starts, and then whenever we enter/leave TUI mode (gdb_save_tty_state). The settings of flags which readline saves and restores are unimportant. */ static struct terminal_info our_terminal_info; /* Snapshot of the initial tty state taken during initialization of GDB, before readline/ncurses have had a chance to change it. This is used as the initial tty state given to each new spawned inferior. Unlike our_terminal_info, this is only ever set once. */ static serial_ttystate initial_gdb_ttystate; static struct terminal_info *get_inflow_inferior_data (struct inferior *); /* While the inferior is running, we want SIGINT and SIGQUIT to go to the inferior only. If we have job control, that takes care of it. If not, we save our handlers in these two variables and set SIGINT and SIGQUIT to SIG_IGN. */ static gdb::optional<sighandler_t> sigint_ours; #ifdef SIGQUIT static gdb::optional<sighandler_t> sigquit_ours; #endif /* The name of the tty (from the `tty' command) that we're giving to the inferior when starting it up. This is only (and should only be) used as a transient global by new_tty_prefork, create_tty_session, new_tty and new_tty_postfork, all called from fork_inferior, while forking a new child. */ static std::string inferior_thisrun_terminal; /* Track who owns GDB's terminal (is it GDB or some inferior?). While target_terminal::is_ours() etc. tracks the core's intention and is independent of the target backend, this tracks the actual state of GDB's own tty. So for example, (target_terminal::is_inferior () && gdb_tty_state == terminal_is_ours) is true when the (native) inferior is not sharing a terminal with GDB (e.g., because we attached to an inferior that is running on a different terminal). */ static target_terminal_state gdb_tty_state = target_terminal_state::is_ours; /* See terminal.h. */ void set_initial_gdb_ttystate (void) { /* Note we can't do any of this in _initialize_inflow because at that point stdin_serial has not been created yet. */ initial_gdb_ttystate = serial_get_tty_state (stdin_serial); if (initial_gdb_ttystate != NULL) { our_terminal_info.ttystate = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); #ifdef F_GETFL our_terminal_info.tflags = fcntl (0, F_GETFL, 0); #endif #ifdef HAVE_TERMIOS_H our_terminal_info.process_group = tcgetpgrp (0); #endif } } /* Does GDB have a terminal (on stdin)? */ static int gdb_has_a_terminal (void) { return initial_gdb_ttystate != NULL; } /* Macro for printing errors from ioctl operations */ #define OOPSY(what) \ if (result == -1) \ gdb_printf(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ what, safe_strerror (errno)) /* Initialize the terminal settings we record for the inferior, before we actually run the inferior. */ void child_terminal_init (struct target_ops *self) { if (!gdb_has_a_terminal ()) return; inferior *inf = current_inferior (); terminal_info *tinfo = get_inflow_inferior_data (inf); #ifdef HAVE_TERMIOS_H /* A child we spawn should be a process group leader (PGID==PID) at this point, though that may not be true if we're attaching to an existing process. */ tinfo->process_group = inf->pid; #endif xfree (tinfo->ttystate); tinfo->ttystate = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); } /* Save the terminal settings again. This is necessary for the TUI when it switches to TUI or non-TUI mode; curses changes the terminal and gdb must be able to restore it correctly. */ void gdb_save_tty_state (void) { if (gdb_has_a_terminal ()) { xfree (our_terminal_info.ttystate); our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); } } /* See inferior.h. */ tribool is_gdb_terminal (const char *tty) { struct stat gdb_tty; struct stat other_tty; int res; res = stat (tty, &other_tty); if (res == -1) return TRIBOOL_UNKNOWN; res = fstat (STDIN_FILENO, &gdb_tty); if (res == -1) return TRIBOOL_UNKNOWN; return ((gdb_tty.st_dev == other_tty.st_dev && gdb_tty.st_ino == other_tty.st_ino) ? TRIBOOL_TRUE : TRIBOOL_FALSE); } /* Return true if the inferior is using the same TTY for input as GDB is. If this is true, then we save/restore terminal flags/state. This is necessary because if inf->attach_flag is set, we don't offhand know whether we are sharing a terminal with the inferior or not. Attaching a process without a terminal is one case where we do not; attaching a process which we ran from the same shell as GDB via `&' is one case where we do. If we can't determine, we assume the TTY is being shared. This works OK if you're only debugging one inferior. However, if you're debugging more than one inferior, and e.g., one is spawned by GDB with "run" (sharing terminal with GDB), and another is attached to (and running on a different terminal, as is most common), then it matters, because we can only restore the terminal settings of one of the inferiors, and in that scenario, we want to restore the settings of the "run"'ed inferior. Note, this is not the same as determining whether GDB and the inferior are in the same session / connected to the same controlling tty. An inferior (fork child) may call setsid, disconnecting itself from the ctty, while still leaving stdin/stdout/stderr associated with the original terminal. If we're debugging that process, we should also save/restore terminal settings. */ static bool sharing_input_terminal (inferior *inf) { terminal_info *tinfo = get_inflow_inferior_data (inf); tribool res = sharing_input_terminal (inf->pid); if (res == TRIBOOL_UNKNOWN) { /* As fallback, if we can't determine by stat'ing the inferior's tty directly (because it's not supported on this host) and the child was spawned, check whether run_terminal is our tty. This isn't ideal, since this is checking the child's controlling terminal, not the input terminal (which may have been redirected), but is still better than nothing. A false positive ("set inferior-tty" points to our terminal, but I/O was redirected) is much more likely than a false negative ("set inferior-tty" points to some other terminal, and then output was redirected to our terminal), and with a false positive we just end up trying to save/restore terminal settings when we didn't need to or we actually can't. */ if (!tinfo->run_terminal.empty ()) res = is_gdb_terminal (tinfo->run_terminal.c_str ()); /* If we still can't determine, assume yes. */ if (res == TRIBOOL_UNKNOWN) return true; } return res == TRIBOOL_TRUE; } /* Put the inferior's terminal settings into effect. This is preparation for starting or resuming the inferior. */ void child_terminal_inferior (struct target_ops *self) { /* If we resume more than one inferior in the foreground on GDB's terminal, then the first inferior's terminal settings "win". Note that every child process is put in its own process group, so the first process that ends up resumed ends up determining which process group the kernel forwards Ctrl-C/Ctrl-Z (SIGINT/SIGTTOU) to. */ if (gdb_tty_state == target_terminal_state::is_inferior) return; inferior *inf = current_inferior (); terminal_info *tinfo = get_inflow_inferior_data (inf); if (gdb_has_a_terminal () && tinfo->ttystate != NULL && sharing_input_terminal (inf)) { int result; /* Ignore SIGTTOU since it will happen when we try to set the terminal's state (if gdb_tty_state is currently ours_for_output). */ scoped_ignore_sigttou ignore_sigttou; #ifdef F_GETFL result = fcntl (0, F_SETFL, tinfo->tflags); OOPSY ("fcntl F_SETFL"); #endif result = serial_set_tty_state (stdin_serial, tinfo->ttystate); OOPSY ("setting tty state"); if (!job_control) { sigint_ours = install_sigint_handler (SIG_IGN); #ifdef SIGQUIT sigquit_ours = signal (SIGQUIT, SIG_IGN); #endif } if (job_control) { #ifdef HAVE_TERMIOS_H /* If we can't tell the inferior's actual process group, then restore whatever was the foreground pgrp the last time the inferior was running. See also comments describing terminal_state::process_group. */ #ifdef HAVE_GETPGID result = tcsetpgrp (0, getpgid (inf->pid)); #else result = tcsetpgrp (0, tinfo->process_group); #endif if (result == -1) { #if 0 /* This fails if either GDB has no controlling terminal, e.g., running under 'setsid(1)', or if the inferior is not attached to GDB's controlling terminal. E.g., if it called setsid to create a new session or used the TIOCNOTTY ioctl, or simply if we've attached to a process running on another terminal and we couldn't tell whether it was sharing GDB's terminal (and so assumed yes). */ gdb_printf (gdb_stderr, "[tcsetpgrp failed in child_terminal_inferior: %s]\n", safe_strerror (errno)); #endif } #endif } gdb_tty_state = target_terminal_state::is_inferior; } } /* Put some of our terminal settings into effect, enough to get proper results from our output, but do not change into or out of RAW mode so that no input is discarded. After doing this, either terminal_ours or terminal_inferior should be called to get back to a normal state of affairs. N.B. The implementation is (currently) no different than child_terminal_ours. See child_terminal_ours_1. */ void child_terminal_ours_for_output (struct target_ops *self) { child_terminal_ours_1 (target_terminal_state::is_ours_for_output); } /* Put our terminal settings into effect. First record the inferior's terminal settings so they can be restored properly later. N.B. Targets that want to use this with async support must build that support on top of this (e.g., the caller still needs to add stdin to the event loop). E.g., see linux_nat_terminal_ours. */ void child_terminal_ours (struct target_ops *self) { child_terminal_ours_1 (target_terminal_state::is_ours); } /* Save the current terminal settings in the inferior's terminal_info cache. */ void child_terminal_save_inferior (struct target_ops *self) { /* Avoid attempting all the ioctl's when running in batch. */ if (!gdb_has_a_terminal ()) return; inferior *inf = current_inferior (); terminal_info *tinfo = get_inflow_inferior_data (inf); /* No need to save/restore if the inferior is not sharing GDB's tty. */ if (!sharing_input_terminal (inf)) return; xfree (tinfo->ttystate); tinfo->ttystate = serial_get_tty_state (stdin_serial); #ifdef HAVE_TERMIOS_H tinfo->process_group = tcgetpgrp (0); #endif #ifdef F_GETFL tinfo->tflags = fcntl (0, F_GETFL, 0); #endif } /* Switch terminal state to DESIRED_STATE, either is_ours, or is_ours_for_output. */ static void child_terminal_ours_1 (target_terminal_state desired_state) { gdb_assert (desired_state != target_terminal_state::is_inferior); /* Avoid attempting all the ioctl's when running in batch. */ if (!gdb_has_a_terminal ()) return; if (gdb_tty_state != desired_state) { int result ATTRIBUTE_UNUSED; /* Ignore SIGTTOU since it will happen when we try to set the terminal's pgrp. */ scoped_ignore_sigttou ignore_sigttou; /* Set tty state to our_ttystate. */ serial_set_tty_state (stdin_serial, our_terminal_info.ttystate); /* If we only want output, then leave the inferior's pgrp in the foreground, so that Ctrl-C/Ctrl-Z reach the inferior directly. */ if (job_control && desired_state == target_terminal_state::is_ours) { #ifdef HAVE_TERMIOS_H result = tcsetpgrp (0, our_terminal_info.process_group); #if 0 /* This fails on Ultrix with EINVAL if you run the testsuite in the background with nohup, and then log out. GDB never used to check for an error here, so perhaps there are other such situations as well. */ if (result == -1) gdb_printf (gdb_stderr, "[tcsetpgrp failed in child_terminal_ours: %s]\n", safe_strerror (errno)); #endif #endif /* termios */ } if (!job_control && desired_state == target_terminal_state::is_ours) { if (sigint_ours.has_value ()) install_sigint_handler (*sigint_ours); sigint_ours.reset (); #ifdef SIGQUIT if (sigquit_ours.has_value ()) signal (SIGQUIT, *sigquit_ours); sigquit_ours.reset (); #endif } #ifdef F_GETFL result = fcntl (0, F_SETFL, our_terminal_info.tflags); #endif gdb_tty_state = desired_state; } } /* Interrupt the inferior. Implementation of target_interrupt for child/native targets. */ void child_interrupt (struct target_ops *self) { /* Interrupt the first inferior that has a resumed thread. */ thread_info *resumed = NULL; for (thread_info *thr : all_non_exited_threads ()) { if (thr->executing ()) { resumed = thr; break; } if (thr->has_pending_waitstatus ()) resumed = thr; } if (resumed != NULL) { /* Note that unlike pressing Ctrl-C on the controlling terminal, here we only interrupt one process, not the whole process group. This is because interrupting a process group (with either Ctrl-C or with kill(3) with negative PID) sends a SIGINT to each process in the process group, and we may not be debugging all processes in the process group. */ #ifndef _WIN32 kill (resumed->inf->pid, SIGINT); #endif } } /* Pass a Ctrl-C to the inferior as-if a Ctrl-C was pressed while the inferior was in the foreground. Implementation of target_pass_ctrlc for child/native targets. */ void child_pass_ctrlc (struct target_ops *self) { gdb_assert (!target_terminal::is_ours ()); #ifdef HAVE_TERMIOS_H if (job_control) { pid_t term_pgrp = tcgetpgrp (0); /* If there's any inferior sharing our terminal, pass the SIGINT to the terminal's foreground process group. This acts just like the user typed a ^C on the terminal while the inferior was in the foreground. Note that using a negative process number in kill() is a System V-ism. The proper BSD interface is killpg(). However, all modern BSDs support the System V interface too. */ if (term_pgrp != -1 && term_pgrp != our_terminal_info.process_group) { kill (-term_pgrp, SIGINT); return; } } #endif /* Otherwise, pass the Ctrl-C to the first inferior that was resumed in the foreground. */ for (inferior *inf : all_inferiors ()) { if (inf->terminal_state != target_terminal_state::is_ours) { gdb_assert (inf->pid != 0); #ifndef _WIN32 kill (inf->pid, SIGINT); #endif return; } } /* If no inferior was resumed in the foreground, then how did the !is_ours assert above pass? */ gdb_assert_not_reached ("no inferior resumed in the fg found"); } /* Per-inferior data key. */ static const registry<inferior>::key<terminal_info> inflow_inferior_data; terminal_info::~terminal_info () { xfree (ttystate); } /* Get the current svr4 data. If none is found yet, add it now. This function always returns a valid object. */ static struct terminal_info * get_inflow_inferior_data (struct inferior *inf) { struct terminal_info *info; info = inflow_inferior_data.get (inf); if (info == NULL) info = inflow_inferior_data.emplace (inf); return info; } /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member of the inferior structure. This field is private to inflow.c, and its type is opaque to the rest of GDB. PID is the target pid of the inferior that is about to be removed from the inferior list. */ static void inflow_inferior_exit (struct inferior *inf) { inf->terminal_state = target_terminal_state::is_ours; inflow_inferior_data.clear (inf); } void copy_terminal_info (struct inferior *to, struct inferior *from) { struct terminal_info *tinfo_to, *tinfo_from; tinfo_to = get_inflow_inferior_data (to); tinfo_from = get_inflow_inferior_data (from); xfree (tinfo_to->ttystate); *tinfo_to = *tinfo_from; if (tinfo_from->ttystate) tinfo_to->ttystate = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); to->terminal_state = from->terminal_state; } /* See terminal.h. */ void swap_terminal_info (inferior *a, inferior *b) { terminal_info *info_a = inflow_inferior_data.get (a); terminal_info *info_b = inflow_inferior_data.get (b); inflow_inferior_data.set (a, info_b); inflow_inferior_data.set (b, info_a); std::swap (a->terminal_state, b->terminal_state); } static void info_terminal_command (const char *arg, int from_tty) { target_terminal::info (arg, from_tty); } void child_terminal_info (struct target_ops *self, const char *args, int from_tty) { struct inferior *inf; struct terminal_info *tinfo; if (!gdb_has_a_terminal ()) { gdb_printf (_("This GDB does not control a terminal.\n")); return; } if (inferior_ptid == null_ptid) return; inf = current_inferior (); tinfo = get_inflow_inferior_data (inf); gdb_printf (_("Inferior's terminal status " "(currently saved by GDB):\n")); /* First the fcntl flags. */ { int flags; flags = tinfo->tflags; gdb_printf ("File descriptor flags = "); #ifndef O_ACCMODE #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) #endif /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ switch (flags & (O_ACCMODE)) { case O_RDONLY: gdb_printf ("O_RDONLY"); break; case O_WRONLY: gdb_printf ("O_WRONLY"); break; case O_RDWR: gdb_printf ("O_RDWR"); break; } flags &= ~(O_ACCMODE); #ifdef O_NONBLOCK if (flags & O_NONBLOCK) gdb_printf (" | O_NONBLOCK"); flags &= ~O_NONBLOCK; #endif #if defined (O_NDELAY) /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will print it as O_NONBLOCK, which is good cause that is what POSIX has, and the flag will already be cleared by the time we get here. */ if (flags & O_NDELAY) gdb_printf (" | O_NDELAY"); flags &= ~O_NDELAY; #endif if (flags & O_APPEND) gdb_printf (" | O_APPEND"); flags &= ~O_APPEND; #if defined (O_BINARY) if (flags & O_BINARY) gdb_printf (" | O_BINARY"); flags &= ~O_BINARY; #endif if (flags) gdb_printf (" | 0x%x", flags); gdb_printf ("\n"); } #ifdef HAVE_TERMIOS_H gdb_printf ("Process group = %d\n", (int) tinfo->process_group); #endif serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); } /* NEW_TTY_PREFORK is called before forking a new child process, so we can record the state of ttys in the child to be formed. TTYNAME is empty if we are to share the terminal with gdb; otherwise it contains the name of the desired tty. NEW_TTY is called in new child processes under Unix, which will become debugger target processes. This actually switches to the terminal specified in the NEW_TTY_PREFORK call. */ void new_tty_prefork (std::string ttyname) { /* Save the name for later, for determining whether we and the child are sharing a tty. */ inferior_thisrun_terminal = std::move (ttyname); } #if !defined(__GO32__) && !defined(_WIN32) /* If RESULT, assumed to be the return value from a system call, is negative, print the error message indicated by errno and exit. MSG should identify the operation that failed. */ static void check_syscall (const char *msg, int result) { if (result < 0) { print_sys_errmsg (msg, errno); _exit (1); } } #endif void new_tty (void) { if (inferior_thisrun_terminal.empty ()) return; #if !defined(__GO32__) && !defined(_WIN32) int tty; #ifdef TIOCNOTTY /* Disconnect the child process from our controlling terminal. On some systems (SVR4 for example), this may cause a SIGTTOU, so temporarily ignore SIGTTOU. */ tty = open ("/dev/tty", O_RDWR); if (tty >= 0) { scoped_ignore_sigttou ignore_sigttou; ioctl (tty, TIOCNOTTY, 0); close (tty); } #endif /* Now open the specified new terminal. */ tty = open (inferior_thisrun_terminal.c_str (), O_RDWR | O_NOCTTY); check_syscall (inferior_thisrun_terminal.c_str (), tty); /* Avoid use of dup2; doesn't exist on all systems. */ if (tty != 0) { close (0); check_syscall ("dup'ing tty into fd 0", dup (tty)); } if (tty != 1) { close (1); check_syscall ("dup'ing tty into fd 1", dup (tty)); } if (tty != 2) { close (2); check_syscall ("dup'ing tty into fd 2", dup (tty)); } #ifdef TIOCSCTTY /* Make tty our new controlling terminal. */ if (ioctl (tty, TIOCSCTTY, 0) == -1) /* Mention GDB in warning because it will appear in the inferior's terminal instead of GDB's. */ warning (_("GDB: Failed to set controlling terminal: %s"), safe_strerror (errno)); #endif if (tty > 2) close (tty); #endif /* !go32 && !win32 */ } /* NEW_TTY_POSTFORK is called after forking a new child process, and adding it to the inferior table, to store the TTYNAME being used by the child, or empty if it sharing the terminal with gdb. */ void new_tty_postfork (void) { /* Save the name for later, for determining whether we and the child are sharing a tty. */ struct inferior *inf = current_inferior (); struct terminal_info *tinfo = get_inflow_inferior_data (inf); tinfo->run_terminal = std::move (inferior_thisrun_terminal); inferior_thisrun_terminal.clear (); } /* Call set_sigint_trap when you need to pass a signal on to an attached process when handling SIGINT. */ static void pass_signal (int signo) { #ifndef _WIN32 kill (inferior_ptid.pid (), SIGINT); #endif } static sighandler_t osig; static int osig_set; void set_sigint_trap (void) { struct inferior *inf = current_inferior (); struct terminal_info *tinfo = get_inflow_inferior_data (inf); if (inf->attach_flag || !tinfo->run_terminal.empty ()) { osig = install_sigint_handler (pass_signal); osig_set = 1; } else osig_set = 0; } void clear_sigint_trap (void) { if (osig_set) { install_sigint_handler (osig); osig_set = 0; } } /* Create a new session if the inferior will run in a different tty. A session is UNIX's way of grouping processes that share a controlling terminal, so a new one is needed if the inferior terminal will be different from GDB's. Returns the session id of the new session, 0 if no session was created or -1 if an error occurred. */ pid_t create_tty_session (void) { #ifdef HAVE_SETSID pid_t ret; if (!job_control || inferior_thisrun_terminal.empty ()) return 0; ret = setsid (); if (ret == -1) warning (_("Failed to create new terminal session: setsid: %s"), safe_strerror (errno)); return ret; #else return 0; #endif /* HAVE_SETSID */ } /* Get all the current tty settings (including whether we have a tty at all!). We can't do this in _initialize_inflow because serial_fdopen() won't work until the serial_ops_list is initialized, but we don't want to do it lazily either, so that we can guarantee stdin_serial is opened if there is a terminal. */ void initialize_stdin_serial (void) { stdin_serial = serial_fdopen (0); } void _initialize_inflow (); void _initialize_inflow () { add_info ("terminal", info_terminal_command, _("Print inferior's saved terminal status.")); /* OK, figure out whether we have job control. */ have_job_control (); gdb::observers::inferior_exit.attach (inflow_inferior_exit, "inflow"); }