| /* Low level interface to ptrace, for GDB when running under Unix. |
| Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
| 1996, 1998, 1999, 2000, 2001 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 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #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 "gdb_string.h" |
| #include <signal.h> |
| #include <fcntl.h> |
| #ifdef HAVE_SYS_SELECT_H |
| #include <sys/select.h> |
| #endif |
| |
| #ifdef HAVE_TERMIOS |
| #define PROCESS_GROUP_TYPE pid_t |
| #endif |
| |
| #ifdef HAVE_TERMIO |
| #define PROCESS_GROUP_TYPE int |
| #endif |
| |
| #ifdef HAVE_SGTTY |
| #ifdef SHORT_PGRP |
| /* This is only used for the ultra. Does it have pid_t? */ |
| #define PROCESS_GROUP_TYPE short |
| #else |
| #define PROCESS_GROUP_TYPE int |
| #endif |
| #endif /* sgtty */ |
| |
| #ifdef HAVE_SYS_IOCTL_H |
| #include <sys/ioctl.h> |
| #endif |
| |
| #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
| static void handle_sigio (int); |
| #endif |
| |
| extern void _initialize_inflow (void); |
| |
| static void pass_signal (int); |
| |
| static void kill_command (char *, int); |
| |
| static void terminal_ours_1 (int); |
| |
| /* Record terminal status separately for debugger and inferior. */ |
| |
| static struct serial *stdin_serial; |
| |
| /* TTY state for the inferior. We save it whenever the inferior stops, and |
| restore it when it resumes. */ |
| static serial_ttystate inferior_ttystate; |
| |
| /* Our own tty state, which we restore every time we need to deal with the |
| terminal. We only set it once, when GDB first starts. The settings of |
| flags which readline saves and restores and unimportant. */ |
| static serial_ttystate our_ttystate; |
| |
| /* fcntl flags for us and the inferior. Saved and restored just like |
| {our,inferior}_ttystate. */ |
| static int tflags_inferior; |
| static int tflags_ours; |
| |
| #ifdef PROCESS_GROUP_TYPE |
| /* Process group for us and the inferior. Saved and restored just like |
| {our,inferior}_ttystate. */ |
| PROCESS_GROUP_TYPE our_process_group; |
| PROCESS_GROUP_TYPE 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 void (*sigint_ours) (); |
| static void (*sigquit_ours) (); |
| |
| /* The name of the tty (from the `tty' command) that we gave to the inferior |
| when it was last started. */ |
| |
| static 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; |
| |
| enum |
| { |
| yes, no, have_not_checked |
| } |
| gdb_has_a_terminal_flag = have_not_checked; |
| |
| /* Does GDB have a terminal (on stdin)? */ |
| int |
| gdb_has_a_terminal (void) |
| { |
| switch (gdb_has_a_terminal_flag) |
| { |
| case yes: |
| return 1; |
| case no: |
| return 0; |
| case have_not_checked: |
| /* Get all the current tty settings (including whether we have a |
| tty at all!). Can't do this in _initialize_inflow because |
| serial_fdopen() won't work until the serial_ops_list is |
| initialized. */ |
| |
| #ifdef F_GETFL |
| tflags_ours = fcntl (0, F_GETFL, 0); |
| #endif |
| |
| gdb_has_a_terminal_flag = no; |
| stdin_serial = serial_fdopen (0); |
| if (stdin_serial != NULL) |
| { |
| our_ttystate = serial_get_tty_state (stdin_serial); |
| |
| if (our_ttystate != NULL) |
| { |
| gdb_has_a_terminal_flag = yes; |
| #ifdef HAVE_TERMIOS |
| our_process_group = tcgetpgrp (0); |
| #endif |
| #ifdef HAVE_TERMIO |
| our_process_group = getpgrp (); |
| #endif |
| #ifdef HAVE_SGTTY |
| ioctl (0, TIOCGPGRP, &our_process_group); |
| #endif |
| } |
| } |
| |
| return gdb_has_a_terminal_flag == yes; |
| default: |
| /* "Can't happen". */ |
| return 0; |
| } |
| } |
| |
| /* 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, strerror (errno)) |
| |
| static void terminal_ours_1 (int); |
| |
| /* Initialize the terminal settings we record for the inferior, |
| before we actually run the inferior. */ |
| |
| void |
| terminal_init_inferior_with_pgrp (int pgrp) |
| { |
| if (gdb_has_a_terminal ()) |
| { |
| /* We could just as well copy our_ttystate (if we felt like |
| adding a new function serial_copy_tty_state()). */ |
| if (inferior_ttystate) |
| xfree (inferior_ttystate); |
| inferior_ttystate = serial_get_tty_state (stdin_serial); |
| |
| #ifdef PROCESS_GROUP_TYPE |
| inferior_process_group = pgrp; |
| #endif |
| |
| /* 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; |
| } |
| } |
| |
| void |
| terminal_init_inferior (void) |
| { |
| #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_inferior which |
| passes in the process group to a generic routine which does all the work |
| (and the non-threaded child_terminal_init_inferior can just pass in |
| inferior_ptid to the same routine). */ |
| /* We assume INFERIOR_PID is also the child's process group. */ |
| terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
| #endif /* PROCESS_GROUP_TYPE */ |
| } |
| |
| /* Put the inferior's terminal settings into effect. |
| This is preparation for starting or resuming the inferior. */ |
| |
| void |
| terminal_inferior (void) |
| { |
| if (gdb_has_a_terminal () && terminal_is_ours |
| && inferior_thisrun_terminal == 0) |
| { |
| 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, tflags_inferior); |
| result = fcntl (0, F_SETFL, tflags_inferior); |
| 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, inferior_ttystate); |
| OOPSY ("setting tty state"); |
| |
| if (!job_control) |
| { |
| sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
| #ifdef SIGQUIT |
| sigquit_ours = (void (*)()) 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, inferior_process_group); |
| if (!attach_flag) |
| OOPSY ("tcsetpgrp"); |
| #endif |
| |
| #ifdef HAVE_SGTTY |
| result = ioctl (0, TIOCSPGRP, &inferior_process_group); |
| if (!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. */ |
| |
| void |
| terminal_ours_for_output (void) |
| { |
| terminal_ours_1 (1); |
| } |
| |
| /* Put our terminal settings into effect. |
| First record the inferior's terminal settings |
| so they can be restored properly later. */ |
| |
| void |
| terminal_ours (void) |
| { |
| 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 |
| terminal_ours_1 (int output_only) |
| { |
| /* Checking inferior_thisrun_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. */ |
| if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) |
| return; |
| |
| if (!terminal_is_ours) |
| { |
| #ifdef SIGTTOU |
| /* Ignore this signal since it will happen when we try to set the |
| pgrp. */ |
| void (*osigttou) () = NULL; |
| #endif |
| int result; |
| |
| terminal_is_ours = 1; |
| |
| #ifdef SIGTTOU |
| if (job_control) |
| osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
| #endif |
| |
| if (inferior_ttystate) |
| xfree (inferior_ttystate); |
| inferior_ttystate = serial_get_tty_state (stdin_serial); |
| #ifdef HAVE_TERMIOS |
| inferior_process_group = tcgetpgrp (0); |
| #endif |
| #ifdef HAVE_TERMIO |
| inferior_process_group = getpgrp (); |
| #endif |
| #ifdef HAVE_SGTTY |
| ioctl (0, TIOCGPGRP, &inferior_process_group); |
| #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_ttystate, |
| inferior_ttystate); |
| |
| if (job_control) |
| { |
| #ifdef HAVE_TERMIOS |
| result = tcsetpgrp (0, our_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 terminal_ours: %s]\n", |
| strerror (errno)); |
| #endif |
| #endif /* termios */ |
| |
| #ifdef HAVE_SGTTY |
| result = ioctl (0, TIOCSPGRP, &our_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 |
| tflags_inferior = 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, tflags_ours); |
| result = fcntl (0, F_SETFL, tflags_ours); |
| #endif |
| |
| result = result; /* lint */ |
| } |
| } |
| |
| /* ARGSUSED */ |
| void |
| term_info (char *arg, int from_tty) |
| { |
| target_terminal_info (arg, from_tty); |
| } |
| |
| /* ARGSUSED */ |
| void |
| child_terminal_info (char *args, int from_tty) |
| { |
| if (!gdb_has_a_terminal ()) |
| { |
| printf_filtered ("This GDB does not control a terminal.\n"); |
| return; |
| } |
| |
| printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); |
| |
| /* First the fcntl flags. */ |
| { |
| int flags; |
| |
| flags = tflags_inferior; |
| |
| 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) inferior_process_group); |
| #endif |
| |
| serial_print_tty_state (stdin_serial, inferior_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 (char *ttyname) |
| { |
| /* Save the name for later, for determining whether we and the child |
| are sharing a tty. */ |
| inferior_thisrun_terminal = ttyname; |
| } |
| |
| void |
| new_tty (void) |
| { |
| register 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) |
| { |
| void (*osigttou) (); |
| |
| osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
| ioctl (tty, TIOCNOTTY, 0); |
| close (tty); |
| signal (SIGTTOU, osigttou); |
| } |
| #endif |
| |
| /* Now open the specified new terminal. */ |
| |
| #ifdef USE_O_NOCTTY |
| tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
| #else |
| tty = open (inferior_thisrun_terminal, O_RDWR); |
| #endif |
| if (tty == -1) |
| { |
| print_sys_errmsg (inferior_thisrun_terminal, errno); |
| _exit (1); |
| } |
| |
| /* Avoid use of dup2; doesn't exist on all systems. */ |
| if (tty != 0) |
| { |
| close (0); |
| dup (tty); |
| } |
| if (tty != 1) |
| { |
| close (1); |
| dup (tty); |
| } |
| if (tty != 2) |
| { |
| close (2); |
| dup (tty); |
| } |
| if (tty > 2) |
| close (tty); |
| #endif /* !go32 && !win32 */ |
| } |
| |
| /* Kill the inferior process. Make us have no inferior. */ |
| |
| /* ARGSUSED */ |
| static void |
| kill_command (char *arg, int from_tty) |
| { |
| /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
| It should be a distinct flag that indicates that a target is active, cuz |
| some targets don't have processes! */ |
| |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| error ("The program is not being run."); |
| if (!query ("Kill the program being debugged? ")) |
| error ("Not confirmed."); |
| target_kill (); |
| |
| init_thread_list (); /* Destroy thread info */ |
| |
| /* Killing off the inferior can leave us with a core file. If so, |
| print the state we are left in. */ |
| if (target_has_stack) |
| { |
| printf_filtered ("In %s,\n", target_longname); |
| if (selected_frame == NULL) |
| fputs_filtered ("No selected stack frame.\n", gdb_stdout); |
| else |
| print_stack_frame (selected_frame, selected_frame_level, 1); |
| } |
| } |
| |
| /* Call set_sigint_trap when you need to pass a signal on to an attached |
| process when handling SIGINT */ |
| |
| /* ARGSUSED */ |
| static void |
| pass_signal (int signo) |
| { |
| #ifndef _WIN32 |
| kill (PIDGET (inferior_ptid), SIGINT); |
| #endif |
| } |
| |
| static void (*osig) (); |
| |
| void |
| set_sigint_trap (void) |
| { |
| if (attach_flag || inferior_thisrun_terminal) |
| { |
| osig = (void (*)()) signal (SIGINT, pass_signal); |
| } |
| } |
| |
| void |
| clear_sigint_trap (void) |
| { |
| if (attach_flag || inferior_thisrun_terminal) |
| { |
| signal (SIGINT, osig); |
| } |
| } |
| |
| #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
| static void (*old_sigio) (); |
| |
| static void |
| handle_sigio (int signo) |
| { |
| int numfds; |
| fd_set readfds; |
| |
| signal (SIGIO, handle_sigio); |
| |
| FD_ZERO (&readfds); |
| FD_SET (target_activity_fd, &readfds); |
| numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); |
| if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) |
| { |
| #ifndef _WIN32 |
| if ((*target_activity_function) ()) |
| kill (PIDGET (inferior_ptid), SIGINT); |
| #endif |
| } |
| } |
| |
| static int old_fcntl_flags; |
| |
| void |
| set_sigio_trap (void) |
| { |
| if (target_activity_function) |
| { |
| old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
| fcntl (target_activity_fd, F_SETOWN, getpid ()); |
| old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
| fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); |
| } |
| } |
| |
| void |
| clear_sigio_trap (void) |
| { |
| if (target_activity_function) |
| { |
| signal (SIGIO, old_sigio); |
| fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); |
| } |
| } |
| #else /* No SIGIO. */ |
| void |
| set_sigio_trap (void) |
| { |
| if (target_activity_function) |
| internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
| } |
| |
| void |
| clear_sigio_trap (void) |
| { |
| if (target_activity_function) |
| internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
| } |
| #endif /* No SIGIO. */ |
| |
| |
| /* This is here because this is where we figure out whether we (probably) |
| have job control. Just using job_control only does part of it because |
| setpgid or setpgrp might not exist on a system without job control. |
| It might be considered misplaced (on the other hand, process groups and |
| job control are closely related to ttys). |
| |
| For a more clean implementation, in libiberty, put a setpgid which merely |
| calls setpgrp and a setpgrp which does nothing (any system with job control |
| will have one or the other). */ |
| int |
| gdb_setpgid (void) |
| { |
| int retval = 0; |
| |
| if (job_control) |
| { |
| #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
| #ifdef HAVE_SETPGID |
| /* The call setpgid (0, 0) is supposed to work and mean the same |
| thing as this, but on Ultrix 4.2A it fails with EPERM (and |
| setpgid (getpid (), getpid ()) succeeds). */ |
| retval = setpgid (getpid (), getpid ()); |
| #else |
| #ifdef HAVE_SETPGRP |
| #ifdef SETPGRP_VOID |
| retval = setpgrp (); |
| #else |
| retval = setpgrp (getpid (), getpid ()); |
| #endif |
| #endif /* HAVE_SETPGRP */ |
| #endif /* HAVE_SETPGID */ |
| #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ |
| } |
| |
| return retval; |
| } |
| |
| void |
| _initialize_inflow (void) |
| { |
| add_info ("terminal", term_info, |
| "Print inferior's saved terminal status."); |
| |
| add_com ("kill", class_run, kill_command, |
| "Kill execution of program being debugged."); |
| |
| inferior_ptid = null_ptid; |
| |
| terminal_is_ours = 1; |
| |
| /* OK, figure out whether we have job control. If neither termios nor |
| sgtty (i.e. termio or go32), leave job_control 0. */ |
| |
| #if defined (HAVE_TERMIOS) |
| /* Do all systems with termios have the POSIX way of identifying job |
| control? I hope so. */ |
| #ifdef _POSIX_JOB_CONTROL |
| job_control = 1; |
| #else |
| #ifdef _SC_JOB_CONTROL |
| job_control = sysconf (_SC_JOB_CONTROL); |
| #else |
| job_control = 0; /* have to assume the worst */ |
| #endif /* _SC_JOB_CONTROL */ |
| #endif /* _POSIX_JOB_CONTROL */ |
| #endif /* HAVE_TERMIOS */ |
| |
| #ifdef HAVE_SGTTY |
| #ifdef TIOCGPGRP |
| job_control = 1; |
| #else |
| job_control = 0; |
| #endif /* TIOCGPGRP */ |
| #endif /* sgtty */ |
| } |