| /* Low level interface to ptrace, for GDB when running under Unix. |
| Copyright (C) 1986-2017 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 "observer.h" |
| #include <signal.h> |
| #include <fcntl.h> |
| #include "gdb_select.h" |
| |
| #include "inflow.h" |
| #include "gdbcmd.h" |
| #include "gdb_termios.h" |
| #include "job-control.h" |
| |
| #ifdef HAVE_SYS_IOCTL_H |
| #include <sys/ioctl.h> |
| #endif |
| |
| #ifndef O_NOCTTY |
| #define O_NOCTTY 0 |
| #endif |
| |
| extern void _initialize_inflow (void); |
| |
| static void pass_signal (int); |
| |
| static void child_terminal_ours_1 (int); |
| |
| /* 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 foreground |
| inferior when it resumes. */ |
| struct terminal_info |
| { |
| /* The name of the tty (from the `tty' command) that we gave to the |
| inferior when it was started. */ |
| char *run_terminal; |
| |
| /* TTY state. We save it whenever the inferior stops, and restore |
| it when it resumes. */ |
| serial_ttystate ttystate; |
| |
| #ifdef PROCESS_GROUP_TYPE |
| /* Process group. Saved and restored just like ttystate. */ |
| PROCESS_GROUP_TYPE process_group; |
| #endif |
| |
| /* fcntl flags. Saved and restored just like ttystate. */ |
| int tflags; |
| }; |
| |
| /* 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 *); |
| |
| #ifdef PROCESS_GROUP_TYPE |
| |
| /* Return the process group of the current inferior. */ |
| |
| PROCESS_GROUP_TYPE |
| inferior_process_group (void) |
| { |
| return get_inflow_inferior_data (current_inferior ())->process_group; |
| } |
| #endif |
| |
| /* 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 sighandler_t sigint_ours; |
| static sighandler_t sigquit_ours; |
| |
| /* 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 const char *inferior_thisrun_terminal; |
| |
| /* Nonzero if our terminal settings are in effect. Zero if the |
| inferior's settings are in effect. Ignored if !gdb_has_a_terminal |
| (). */ |
| |
| int terminal_is_ours; |
| |
| #ifdef PROCESS_GROUP_TYPE |
| static PROCESS_GROUP_TYPE |
| gdb_getpgrp (void) |
| { |
| int process_group = -1; |
| |
| #ifdef HAVE_TERMIOS |
| process_group = tcgetpgrp (0); |
| #endif |
| #ifdef HAVE_TERMIO |
| process_group = getpgrp (); |
| #endif |
| #ifdef HAVE_SGTTY |
| ioctl (0, TIOCGPGRP, &process_group); |
| #endif |
| return process_group; |
| } |
| #endif |
| |
| /* 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 PROCESS_GROUP_TYPE |
| our_terminal_info.process_group = gdb_getpgrp (); |
| #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) \ |
| fprintf_unfiltered(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_with_pgrp (int pgrp) |
| { |
| struct inferior *inf = current_inferior (); |
| struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
| |
| #ifdef PROCESS_GROUP_TYPE |
| /* Store the process group even without a terminal as it is used not |
| only to reset the tty foreground process group, but also to |
| interrupt the inferior. */ |
| tinfo->process_group = pgrp; |
| #endif |
| |
| if (gdb_has_a_terminal ()) |
| { |
| xfree (tinfo->ttystate); |
| tinfo->ttystate = serial_copy_tty_state (stdin_serial, |
| initial_gdb_ttystate); |
| |
| /* Make sure that next time we call terminal_inferior (which will be |
| before the program runs, as it needs to be), we install the new |
| process group. */ |
| terminal_is_ours = 1; |
| } |
| } |
| |
| /* 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); |
| } |
| } |
| |
| void |
| child_terminal_init (struct target_ops *self) |
| { |
| #ifdef PROCESS_GROUP_TYPE |
| /* This is for Lynx, and should be cleaned up by having Lynx be a |
| separate debugging target with a version of target_terminal_init |
| which passes in the process group to a generic routine which does |
| all the work (and the non-threaded child_terminal_init can just |
| pass in inferior_ptid to the same routine). */ |
| /* We assume INFERIOR_PID is also the child's process group. */ |
| child_terminal_init_with_pgrp (ptid_get_pid (inferior_ptid)); |
| #endif /* PROCESS_GROUP_TYPE */ |
| } |
| |
| /* Put the inferior's terminal settings into effect. |
| This is preparation for starting or resuming the inferior. |
| |
| 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 remove stdin |
| from the event loop). E.g., see linux_nat_terminal_inferior. */ |
| |
| void |
| child_terminal_inferior (struct target_ops *self) |
| { |
| struct inferior *inf; |
| struct terminal_info *tinfo; |
| |
| if (!terminal_is_ours) |
| return; |
| |
| inf = current_inferior (); |
| tinfo = get_inflow_inferior_data (inf); |
| |
| if (gdb_has_a_terminal () |
| && tinfo->ttystate != NULL |
| && tinfo->run_terminal == NULL) |
| { |
| int result; |
| |
| #ifdef F_GETFL |
| /* Is there a reason this is being done twice? It happens both |
| places we use F_SETFL, so I'm inclined to think perhaps there |
| is some reason, however perverse. Perhaps not though... */ |
| result = fcntl (0, F_SETFL, tinfo->tflags); |
| result = fcntl (0, F_SETFL, tinfo->tflags); |
| OOPSY ("fcntl F_SETFL"); |
| #endif |
| |
| /* Because we were careful to not change in or out of raw mode in |
| terminal_ours, we will not change in our out of raw mode with |
| this call, so we don't flush any input. */ |
| result = serial_set_tty_state (stdin_serial, |
| tinfo->ttystate); |
| OOPSY ("setting tty state"); |
| |
| if (!job_control) |
| { |
| sigint_ours = signal (SIGINT, SIG_IGN); |
| #ifdef SIGQUIT |
| sigquit_ours = signal (SIGQUIT, SIG_IGN); |
| #endif |
| } |
| |
| /* If attach_flag is set, we don't 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, I think (but perhaps this is not |
| `sharing' in the sense that we need to save and restore tty |
| state)). I don't know if there is any way to tell whether we |
| are sharing a terminal. So what we do is to go through all |
| the saving and restoring of the tty state, but ignore errors |
| setting the process group, which will happen if we are not |
| sharing a terminal). */ |
| |
| if (job_control) |
| { |
| #ifdef HAVE_TERMIOS |
| result = tcsetpgrp (0, tinfo->process_group); |
| if (!inf->attach_flag) |
| OOPSY ("tcsetpgrp"); |
| #endif |
| |
| #ifdef HAVE_SGTTY |
| result = ioctl (0, TIOCSPGRP, &tinfo->process_group); |
| if (!inf->attach_flag) |
| OOPSY ("TIOCSPGRP"); |
| #endif |
| } |
| |
| } |
| terminal_is_ours = 0; |
| } |
| |
| /* 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 (1); |
| } |
| |
| /* 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 (0); |
| } |
| |
| /* output_only is not used, and should not be used unless we introduce |
| separate terminal_is_ours and terminal_is_ours_for_output |
| flags. */ |
| |
| static void |
| child_terminal_ours_1 (int output_only) |
| { |
| struct inferior *inf; |
| struct terminal_info *tinfo; |
| |
| if (terminal_is_ours) |
| return; |
| |
| terminal_is_ours = 1; |
| |
| /* Checking inferior->run_terminal is necessary so that |
| if GDB is running in the background, it won't block trying |
| to do the ioctl()'s below. Checking gdb_has_a_terminal |
| avoids attempting all the ioctl's when running in batch. */ |
| |
| inf = current_inferior (); |
| tinfo = get_inflow_inferior_data (inf); |
| |
| if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
| return; |
| else |
| { |
| #ifdef SIGTTOU |
| /* Ignore this signal since it will happen when we try to set the |
| pgrp. */ |
| sighandler_t osigttou = NULL; |
| #endif |
| int result ATTRIBUTE_UNUSED; |
| |
| #ifdef SIGTTOU |
| if (job_control) |
| osigttou = signal (SIGTTOU, SIG_IGN); |
| #endif |
| |
| xfree (tinfo->ttystate); |
| tinfo->ttystate = serial_get_tty_state (stdin_serial); |
| |
| #ifdef PROCESS_GROUP_TYPE |
| if (!inf->attach_flag) |
| /* If setpgrp failed in terminal_inferior, this would give us |
| our process group instead of the inferior's. See |
| terminal_inferior for details. */ |
| tinfo->process_group = gdb_getpgrp (); |
| #endif |
| |
| /* Here we used to set ICANON in our ttystate, but I believe this |
| was an artifact from before when we used readline. Readline sets |
| the tty state when it needs to. |
| FIXME-maybe: However, query() expects non-raw mode and doesn't |
| use readline. Maybe query should use readline (on the other hand, |
| this only matters for HAVE_SGTTY, not termio or termios, I think). */ |
| |
| /* Set tty state to our_ttystate. We don't change in our out of raw |
| mode, to avoid flushing input. We need to do the same thing |
| regardless of output_only, because we don't have separate |
| terminal_is_ours and terminal_is_ours_for_output flags. It's OK, |
| though, since readline will deal with raw mode when/if it needs |
| to. */ |
| |
| serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
| tinfo->ttystate); |
| |
| if (job_control) |
| { |
| #ifdef HAVE_TERMIOS |
| 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) |
| fprintf_unfiltered (gdb_stderr, |
| "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
| safe_strerror (errno)); |
| #endif |
| #endif /* termios */ |
| |
| #ifdef HAVE_SGTTY |
| result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
| #endif |
| } |
| |
| #ifdef SIGTTOU |
| if (job_control) |
| signal (SIGTTOU, osigttou); |
| #endif |
| |
| if (!job_control) |
| { |
| signal (SIGINT, sigint_ours); |
| #ifdef SIGQUIT |
| signal (SIGQUIT, sigquit_ours); |
| #endif |
| } |
| |
| #ifdef F_GETFL |
| tinfo->tflags = fcntl (0, F_GETFL, 0); |
| |
| /* Is there a reason this is being done twice? It happens both |
| places we use F_SETFL, so I'm inclined to think perhaps there |
| is some reason, however perverse. Perhaps not though... */ |
| result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
| result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
| #endif |
| } |
| } |
| |
| /* Per-inferior data key. */ |
| static const struct inferior_data *inflow_inferior_data; |
| |
| static void |
| inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
| { |
| struct terminal_info *info = (struct terminal_info *) arg; |
| |
| xfree (info->run_terminal); |
| xfree (info->ttystate); |
| xfree (info); |
| } |
| |
| /* 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 = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
| if (info == NULL) |
| { |
| info = XCNEW (struct terminal_info); |
| set_inferior_data (inf, inflow_inferior_data, info); |
| } |
| |
| 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) |
| { |
| struct terminal_info *info; |
| |
| info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
| if (info != NULL) |
| { |
| xfree (info->run_terminal); |
| xfree (info->ttystate); |
| xfree (info); |
| set_inferior_data (inf, inflow_inferior_data, NULL); |
| } |
| } |
| |
| 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->run_terminal); |
| xfree (tinfo_to->ttystate); |
| |
| *tinfo_to = *tinfo_from; |
| |
| if (tinfo_from->run_terminal) |
| tinfo_to->run_terminal |
| = xstrdup (tinfo_from->run_terminal); |
| |
| if (tinfo_from->ttystate) |
| tinfo_to->ttystate |
| = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); |
| } |
| |
| void |
| info_terminal_command (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 ()) |
| { |
| printf_filtered (_("This GDB does not control a terminal.\n")); |
| return; |
| } |
| |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| return; |
| |
| inf = current_inferior (); |
| tinfo = get_inflow_inferior_data (inf); |
| |
| printf_filtered (_("Inferior's terminal status " |
| "(currently saved by GDB):\n")); |
| |
| /* First the fcntl flags. */ |
| { |
| int flags; |
| |
| flags = tinfo->tflags; |
| |
| printf_filtered ("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: |
| printf_filtered ("O_RDONLY"); |
| break; |
| case O_WRONLY: |
| printf_filtered ("O_WRONLY"); |
| break; |
| case O_RDWR: |
| printf_filtered ("O_RDWR"); |
| break; |
| } |
| flags &= ~(O_ACCMODE); |
| |
| #ifdef O_NONBLOCK |
| if (flags & O_NONBLOCK) |
| printf_filtered (" | 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) |
| printf_filtered (" | O_NDELAY"); |
| flags &= ~O_NDELAY; |
| #endif |
| |
| if (flags & O_APPEND) |
| printf_filtered (" | O_APPEND"); |
| flags &= ~O_APPEND; |
| |
| #if defined (O_BINARY) |
| if (flags & O_BINARY) |
| printf_filtered (" | O_BINARY"); |
| flags &= ~O_BINARY; |
| #endif |
| |
| if (flags) |
| printf_filtered (" | 0x%x", flags); |
| printf_filtered ("\n"); |
| } |
| |
| #ifdef PROCESS_GROUP_TYPE |
| printf_filtered ("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 null if we are to share the terminal with gdb; |
| or points to a string containing 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 (const char *ttyname) |
| { |
| /* Save the name for later, for determining whether we and the child |
| are sharing a tty. */ |
| inferior_thisrun_terminal = 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) |
| { |
| int tty; |
| |
| if (inferior_thisrun_terminal == 0) |
| return; |
| #if !defined(__GO32__) && !defined(_WIN32) |
| #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) |
| { |
| sighandler_t osigttou; |
| |
| osigttou = signal (SIGTTOU, SIG_IGN); |
| ioctl (tty, TIOCNOTTY, 0); |
| close (tty); |
| signal (SIGTTOU, osigttou); |
| } |
| #endif |
| |
| /* Now open the specified new terminal. */ |
| tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
| check_syscall (inferior_thisrun_terminal, 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 null 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. */ |
| |
| if (inferior_thisrun_terminal) |
| { |
| struct inferior *inf = current_inferior (); |
| struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
| |
| tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); |
| } |
| |
| inferior_thisrun_terminal = NULL; |
| } |
| |
| |
| /* 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 (ptid_get_pid (inferior_ptid), 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) |
| { |
| osig = signal (SIGINT, pass_signal); |
| osig_set = 1; |
| } |
| else |
| osig_set = 0; |
| } |
| |
| void |
| clear_sigint_trap (void) |
| { |
| if (osig_set) |
| { |
| signal (SIGINT, 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 == 0) |
| 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) |
| { |
| add_info ("terminal", info_terminal_command, |
| _("Print inferior's saved terminal status.")); |
| |
| terminal_is_ours = 1; |
| |
| /* OK, figure out whether we have job control. */ |
| have_job_control (); |
| |
| observer_attach_inferior_exit (inflow_inferior_exit); |
| |
| inflow_inferior_data |
| = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
| } |