| /* The thing that makes children, remembers them, and contains wait loops. */ |
| |
| /* This file works under BSD, System V, minix, and Posix systems. It does |
| not implement job control. */ |
| |
| /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
| |
| This file is part of GNU Bash, the Bourne Again SHell. |
| |
| Bash 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, or (at your option) any later |
| version. |
| |
| Bash 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 Bash; see the file COPYING. If not, write to the Free Software |
| Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| |
| #include "config.h" |
| |
| #include "bashtypes.h" |
| #include "filecntl.h" |
| |
| #if defined (HAVE_UNISTD_H) |
| # include <unistd.h> |
| #endif |
| |
| #include <stdio.h> |
| #include <signal.h> |
| #include <errno.h> |
| |
| #if defined (BUFFERED_INPUT) |
| # include "input.h" |
| #endif |
| |
| /* Need to include this up here for *_TTY_DRIVER definitions. */ |
| #include "shtty.h" |
| |
| #if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL) |
| /* For struct winsize on SCO */ |
| /* sys/ptem.h has winsize but needs mblk_t from sys/stream.h */ |
| # if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH) |
| # if defined (HAVE_SYS_STREAM_H) |
| # include <sys/stream.h> |
| # endif |
| # include <sys/ptem.h> |
| # endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */ |
| #endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */ |
| |
| #include "shell.h" |
| #include "jobs.h" |
| |
| #include "builtins/builtext.h" /* for wait_builtin */ |
| |
| #if !defined (CHILD_MAX) |
| # define CHILD_MAX 32 |
| #endif |
| |
| #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG) |
| # define killpg(pg, sig) kill(-(pg),(sig)) |
| #endif /* USG || _POSIX_VERSION */ |
| |
| #if !defined (HAVE_SIGINTERRUPT) |
| # define siginterrupt(sig, code) |
| #endif /* !HAVE_SIGINTERRUPT */ |
| |
| #if defined (HAVE_WAITPID) |
| # define WAITPID(pid, statusp, options) waitpid (pid, statusp, options) |
| #else |
| # define WAITPID(pid, statusp, options) wait (statusp) |
| #endif /* !HAVE_WAITPID */ |
| |
| /* Return the fd from which we are actually getting input. */ |
| #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) |
| |
| #if !defined (errno) |
| extern int errno; |
| #endif /* !errno */ |
| |
| #if defined (READLINE) |
| extern void rl_set_screen_size __P((int, int)); |
| #endif |
| |
| extern int interactive, interactive_shell, login_shell; |
| extern int subshell_environment; |
| extern int last_command_exit_value; |
| extern int interrupt_immediately; |
| extern Function *this_shell_builtin; |
| #if defined (HAVE_POSIX_SIGNALS) |
| extern sigset_t top_level_mask; |
| #endif |
| extern procenv_t wait_intr_buf; |
| |
| pid_t last_made_pid = NO_PID; |
| pid_t last_asynchronous_pid = NO_PID; |
| |
| /* Call this when you start making children. */ |
| int already_making_children = 0; |
| |
| /* The controlling tty for this shell. */ |
| int shell_tty = -1; |
| |
| /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
| exits from get_tty_state(). */ |
| int check_window_size; |
| |
| #if defined (HAVE_WAITPID) |
| static void reap_zombie_children (); |
| #endif |
| |
| static int wait_sigint_received; |
| |
| /* STATUS and FLAGS are only valid if pid != NO_PID |
| STATUS is only valid if (flags & PROC_RUNNING) == 0 */ |
| struct proc_status { |
| pid_t pid; |
| int status; /* Exit status of PID or 128 + fatal signal number */ |
| int flags; |
| }; |
| |
| /* Values for proc_status.flags */ |
| #define PROC_RUNNING 0x01 |
| #define PROC_NOTIFIED 0x02 |
| #define PROC_ASYNC 0x04 |
| |
| static struct proc_status *pid_list = (struct proc_status *)NULL; |
| static int pid_list_size; |
| |
| /* Return values from find_status_by_pid */ |
| #define PROC_BAD -1 |
| #define PROC_STILL_ALIVE -2 |
| |
| /* Allocate new, or grow existing PID_LIST. */ |
| static void |
| alloc_pid_list () |
| { |
| register int i; |
| int old = pid_list_size; |
| |
| pid_list_size += 10; |
| pid_list = (struct proc_status *) |
| xrealloc (pid_list, pid_list_size * sizeof (struct proc_status)); |
| |
| /* None of the newly allocated slots have process id's yet. */ |
| for (i = old; i < pid_list_size; i++) |
| pid_list[i].pid = NO_PID; |
| } |
| |
| /* Return the offset within the PID_LIST array of an empty slot. This can |
| create new slots if all of the existing slots are taken. */ |
| static int |
| find_proc_slot () |
| { |
| register int i; |
| |
| for (i = 0; i < pid_list_size; i++) |
| if (pid_list[i].pid == NO_PID) |
| return (i); |
| |
| if (i == pid_list_size) |
| alloc_pid_list (); |
| |
| return (i); |
| } |
| |
| /* Return the offset within the PID_LIST array of a slot containing PID, |
| or the value NO_PID if the pid wasn't found. */ |
| static int |
| find_index_by_pid (pid) |
| pid_t pid; |
| { |
| register int i; |
| |
| for (i = 0; i < pid_list_size; i++) |
| if (pid_list[i].pid == pid) |
| return (i); |
| |
| return (NO_PID); |
| } |
| |
| /* Return the status of PID as looked up in the PID_LIST array. A |
| return value of PROC_BAD indicates that PID wasn't found. */ |
| static int |
| find_status_by_pid (pid) |
| pid_t pid; |
| { |
| int i; |
| |
| i = find_index_by_pid (pid); |
| if (i == NO_PID) |
| return (PROC_BAD); |
| if (pid_list[i].flags & PROC_RUNNING) |
| return (PROC_STILL_ALIVE); |
| return (pid_list[i].status); |
| } |
| |
| static int |
| process_exit_status (status) |
| WAIT status; |
| { |
| if (WIFSIGNALED (status)) |
| return (128 + WTERMSIG (status)); |
| else |
| return (WEXITSTATUS (status)); |
| } |
| |
| /* Give PID the status value STATUS in the PID_LIST array. */ |
| static void |
| set_pid_status (pid, status) |
| pid_t pid; |
| WAIT status; |
| { |
| int slot; |
| |
| slot = find_index_by_pid (pid); |
| if (slot == NO_PID) |
| return; |
| |
| pid_list[slot].status = process_exit_status (status); |
| pid_list[slot].flags &= ~PROC_RUNNING; |
| /* If it's not a background process, mark it as notified so it gets |
| cleaned up. */ |
| if ((pid_list[slot].flags & PROC_ASYNC) == 0) |
| pid_list[slot].flags |= PROC_NOTIFIED; |
| } |
| |
| /* Give PID the flags FLAGS in the PID_LIST array. */ |
| static void |
| set_pid_flags (pid, flags) |
| pid_t pid; |
| int flags; |
| { |
| int slot; |
| |
| slot = find_index_by_pid (pid); |
| if (slot == NO_PID) |
| return; |
| |
| pid_list[slot].flags |= flags; |
| } |
| |
| /* Unset FLAGS for PID in the pid list */ |
| static void |
| unset_pid_flags (pid, flags) |
| pid_t pid; |
| int flags; |
| { |
| int slot; |
| |
| slot = find_index_by_pid (pid); |
| if (slot == NO_PID) |
| return; |
| |
| pid_list[slot].flags &= ~flags; |
| } |
| |
| static void |
| add_pid (pid, async) |
| pid_t pid; |
| int async; |
| { |
| int slot; |
| |
| slot = find_proc_slot (); |
| |
| pid_list[slot].pid = pid; |
| pid_list[slot].status = -1; |
| pid_list[slot].flags = PROC_RUNNING; |
| if (async) |
| pid_list[slot].flags |= PROC_ASYNC; |
| } |
| |
| static void |
| mark_dead_jobs_as_notified (force) |
| int force; |
| { |
| register int i, ndead; |
| |
| /* first, count the number of non-running async jobs if FORCE == 0 */ |
| for (i = ndead = 0; force == 0 && i < pid_list_size; i++) |
| { |
| if (pid_list[i].pid == NO_PID) |
| continue; |
| if (((pid_list[i].flags & PROC_RUNNING) == 0) && |
| (pid_list[i].flags & PROC_ASYNC)) |
| ndead++; |
| } |
| |
| if (force == 0 && ndead <= CHILD_MAX) |
| return; |
| |
| /* If FORCE == 0, we just mark as many non-running async jobs as notified |
| to bring us under the CHILD_MAX limit. */ |
| for (i = 0; i < pid_list_size; i++) |
| { |
| if (pid_list[i].pid == NO_PID) |
| continue; |
| if (((pid_list[i].flags & PROC_RUNNING) == 0) && |
| pid_list[i].pid != last_asynchronous_pid) |
| { |
| pid_list[i].flags |= PROC_NOTIFIED; |
| if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= CHILD_MAX) |
| break; |
| } |
| } |
| } |
| |
| /* Remove all dead, notified jobs from the pid_list. */ |
| int |
| cleanup_dead_jobs () |
| { |
| register int i; |
| |
| #if defined (HAVE_WAITPID) |
| reap_zombie_children (); |
| #endif |
| |
| for (i = 0; i < pid_list_size; i++) |
| { |
| if ((pid_list[i].flags & PROC_RUNNING) == 0 && |
| (pid_list[i].flags & PROC_NOTIFIED)) |
| pid_list[i].pid = NO_PID; |
| } |
| |
| return 0; |
| } |
| |
| void |
| reap_dead_jobs () |
| { |
| mark_dead_jobs_as_notified (0); |
| cleanup_dead_jobs (); |
| } |
| |
| /* Initialize the job control mechanism, and set up the tty stuff. */ |
| initialize_job_control (force) |
| int force; |
| { |
| shell_tty = fileno (stderr); |
| |
| if (interactive) |
| get_tty_state (); |
| } |
| |
| #if defined (TIOCGWINSZ) && defined (SIGWINCH) |
| static SigHandler *old_winch = (SigHandler *)SIG_DFL; |
| |
| static void |
| get_new_window_size (from_sig) |
| int from_sig; |
| { |
| struct winsize win; |
| int tty; |
| |
| tty = input_tty (); |
| if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) && |
| win.ws_row > 0 && win.ws_col > 0) |
| { |
| #if defined (aixpc) |
| shell_tty_info.c_winsize = win; /* structure copying */ |
| #endif |
| sh_set_lines_and_columns (win.ws_row, win.ws_col); |
| #if defined (READLINE) |
| rl_set_screen_size (win.ws_row, win.ws_col); |
| #endif |
| } |
| } |
| |
| static sighandler |
| sigwinch_sighandler (sig) |
| int sig; |
| { |
| #if defined (MUST_REINSTALL_SIGHANDLERS) |
| set_signal_handler (SIGWINCH, sigwinch_sighandler); |
| #endif /* MUST_REINSTALL_SIGHANDLERS */ |
| get_new_window_size (1); |
| } |
| #else |
| static void |
| get_new_window_size (from_sig) |
| int from_sig; |
| { |
| } |
| #endif /* TIOCGWINSZ && SIGWINCH */ |
| |
| void |
| set_sigwinch_handler () |
| { |
| #if defined (TIOCGWINSZ) && defined (SIGWINCH) |
| old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler); |
| #endif |
| } |
| |
| void |
| unset_sigwinch_handler () |
| { |
| #if defined (TIOCGWINSZ) && defined (SIGWINCH) |
| set_signal_handler (SIGWINCH, old_winch); |
| #endif |
| } |
| |
| /* Setup this shell to handle C-C, etc. */ |
| void |
| initialize_job_signals () |
| { |
| set_signal_handler (SIGINT, sigint_sighandler); |
| set_sigwinch_handler (); |
| |
| /* If this is a login shell we don't wish to be disturbed by |
| stop signals. */ |
| if (login_shell) |
| ignore_tty_job_signals (); |
| } |
| |
| #if defined (HAVE_WAITPID) |
| /* Collect the status of all zombie children so that their system |
| resources can be deallocated. */ |
| static void |
| reap_zombie_children () |
| { |
| #if defined (WNOHANG) |
| pid_t pid; |
| WAIT status; |
| |
| while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0) |
| set_pid_status (pid, status); |
| #endif |
| } |
| #endif /* WAITPID && WNOHANG */ |
| |
| /* Fork, handling errors. Returns the pid of the newly made child, or 0. |
| COMMAND is just for remembering the name of the command; we don't do |
| anything else with it. ASYNC_P says what to do with the tty. If |
| non-zero, then don't give it away. */ |
| pid_t |
| make_child (command, async_p) |
| char *command; |
| int async_p; |
| { |
| pid_t pid; |
| #if defined (HAVE_WAITPID) |
| int retry = 1; |
| #endif /* HAVE_WAITPID */ |
| |
| /* Discard saved memory. */ |
| if (command) |
| free (command); |
| |
| start_pipeline (); |
| |
| #if defined (BUFFERED_INPUT) |
| /* If default_buffered_input is active, we are reading a script. If |
| the command is asynchronous, we have already duplicated /dev/null |
| as fd 0, but have not changed the buffered stream corresponding to |
| the old fd 0. We don't want to sync the stream in this case. */ |
| if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0)) |
| sync_buffered_stream (default_buffered_input); |
| #endif /* BUFFERED_INPUT */ |
| |
| /* Create the child, handle severe errors. */ |
| #if defined (HAVE_WAITPID) |
| retry_fork: |
| #endif /* HAVE_WAITPID */ |
| |
| if ((pid = fork ()) < 0) |
| { |
| #if defined (HAVE_WAITPID) |
| /* Posix systems with a non-blocking waitpid () system call available |
| get another chance after zombies are reaped. */ |
| if (errno == EAGAIN && retry) |
| { |
| reap_zombie_children (); |
| retry = 0; |
| goto retry_fork; |
| } |
| #endif /* HAVE_WAITPID */ |
| |
| sys_error ("fork"); |
| |
| throw_to_top_level (); |
| } |
| |
| if (pid == 0) |
| { |
| #if defined (BUFFERED_INPUT) |
| unset_bash_input (0); |
| #endif /* BUFFERED_INPUT */ |
| |
| #if defined (HAVE_POSIX_SIGNALS) |
| /* Restore top-level signal mask. */ |
| sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); |
| #endif |
| |
| /* Ignore INT and QUIT in asynchronous children. */ |
| if (async_p) |
| last_asynchronous_pid = getpid (); |
| |
| default_tty_job_signals (); |
| } |
| else |
| { |
| /* In the parent. */ |
| |
| last_made_pid = pid; |
| |
| if (async_p) |
| last_asynchronous_pid = pid; |
| |
| add_pid (pid, async_p); |
| } |
| return (pid); |
| } |
| |
| void |
| ignore_tty_job_signals () |
| { |
| #if defined (SIGTSTP) |
| set_signal_handler (SIGTSTP, SIG_IGN); |
| set_signal_handler (SIGTTIN, SIG_IGN); |
| set_signal_handler (SIGTTOU, SIG_IGN); |
| #endif |
| } |
| |
| void |
| default_tty_job_signals () |
| { |
| #if defined (SIGTSTP) |
| set_signal_handler (SIGTSTP, SIG_DFL); |
| set_signal_handler (SIGTTIN, SIG_DFL); |
| set_signal_handler (SIGTTOU, SIG_DFL); |
| #endif |
| } |
| |
| /* Wait for a single pid (PID) and return its exit status. Called by |
| the wait builtin. */ |
| wait_for_single_pid (pid) |
| pid_t pid; |
| { |
| pid_t got_pid; |
| WAIT status; |
| int pstatus; |
| |
| pstatus = find_status_by_pid (pid); |
| |
| if (pstatus == PROC_BAD) |
| { |
| internal_error ("wait: pid %d is not a child of this shell", pid); |
| return (127); |
| } |
| |
| if (pstatus != PROC_STILL_ALIVE) |
| return (pstatus); |
| |
| siginterrupt (SIGINT, 1); |
| while ((got_pid = WAITPID (pid, &status, 0)) != pid) |
| { |
| if (got_pid < 0) |
| { |
| if (errno != EINTR && errno != ECHILD) |
| { |
| siginterrupt (SIGINT, 0); |
| sys_error ("wait"); |
| } |
| break; |
| } |
| else if (got_pid > 0) |
| set_pid_status (got_pid, status); |
| } |
| |
| set_pid_status (got_pid, status); |
| set_pid_flags (got_pid, PROC_NOTIFIED); |
| |
| siginterrupt (SIGINT, 0); |
| QUIT; |
| |
| return (process_exit_status (status)); |
| } |
| |
| /* Wait for all of the shell's children to exit. Called by the `wait' |
| builtin. */ |
| void |
| wait_for_background_pids () |
| { |
| pid_t got_pid; |
| WAIT status; |
| |
| /* If we aren't using job control, we let the kernel take care of the |
| bookkeeping for us. wait () will return -1 and set errno to ECHILD |
| when there are no more unwaited-for child processes on both |
| 4.2 BSD-based and System V-based systems. */ |
| |
| siginterrupt (SIGINT, 1); |
| |
| /* Wait for ECHILD */ |
| while ((got_pid = WAITPID (-1, &status, 0)) != -1) |
| set_pid_status (got_pid, status); |
| |
| if (errno != EINTR && errno != ECHILD) |
| { |
| siginterrupt (SIGINT, 0); |
| sys_error("wait"); |
| } |
| |
| siginterrupt (SIGINT, 0); |
| QUIT; |
| |
| mark_dead_jobs_as_notified (1); |
| cleanup_dead_jobs (); |
| } |
| |
| /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ |
| #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids |
| static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; |
| |
| static void |
| restore_sigint_handler () |
| { |
| if (old_sigint_handler != INVALID_SIGNAL_HANDLER) |
| { |
| set_signal_handler (SIGINT, old_sigint_handler); |
| old_sigint_handler = INVALID_SIGNAL_HANDLER; |
| } |
| } |
| |
| /* Handle SIGINT while we are waiting for children in a script to exit. |
| All interrupts are effectively ignored by the shell, but allowed to |
| kill a running job. */ |
| static sighandler |
| wait_sigint_handler (sig) |
| int sig; |
| { |
| SigHandler *sigint_handler; |
| |
| /* If we got a SIGINT while in `wait', and SIGINT is trapped, do |
| what POSIX.2 says (see builtins/wait.def for more info). */ |
| if (this_shell_builtin && this_shell_builtin == wait_builtin && |
| signal_is_trapped (SIGINT) && |
| ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) |
| { |
| last_command_exit_value = EXECUTION_FAILURE; |
| restore_sigint_handler (); |
| interrupt_immediately = 0; |
| trap_handler (SIGINT); /* set pending_traps[SIGINT] */ |
| longjmp (wait_intr_buf, 1); |
| } |
| |
| if (interrupt_immediately) |
| { |
| last_command_exit_value = EXECUTION_FAILURE; |
| restore_sigint_handler (); |
| ADDINTERRUPT; |
| QUIT; |
| } |
| |
| wait_sigint_received = 1; |
| |
| SIGRETURN (0); |
| } |
| |
| /* Wait for pid (one of our children) to terminate. This is called only |
| by the execution code in execute_cmd.c. */ |
| int |
| wait_for (pid) |
| pid_t pid; |
| { |
| int return_val, pstatus; |
| pid_t got_pid; |
| WAIT status; |
| |
| pstatus = find_status_by_pid (pid); |
| |
| if (pstatus == PROC_BAD) |
| return (0); |
| |
| if (pstatus != PROC_STILL_ALIVE) |
| return (pstatus); |
| |
| /* If we are running a script, ignore SIGINT while we're waiting for |
| a child to exit. The loop below does some of this, but not all. */ |
| wait_sigint_received = 0; |
| if (interactive_shell == 0) |
| old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
| |
| while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */ |
| { |
| if (got_pid < 0 && errno == ECHILD) |
| { |
| #if !defined (_POSIX_VERSION) |
| status.w_termsig = status.w_retcode = 0; |
| #else |
| status = 0; |
| #endif /* _POSIX_VERSION */ |
| break; |
| } |
| else if (got_pid < 0 && errno != EINTR) |
| programming_error ("wait_for(%d): %s", pid, strerror(errno)); |
| else if (got_pid > 0) |
| set_pid_status (got_pid, status); |
| } |
| |
| set_pid_status (got_pid, status); |
| |
| #if defined (HAVE_WAITPID) |
| if (got_pid >= 0) |
| reap_zombie_children (); |
| #endif /* HAVE_WAITPID */ |
| |
| if (interactive_shell == 0) |
| { |
| SigHandler *temp_handler; |
| |
| temp_handler = old_sigint_handler; |
| restore_sigint_handler (); |
| |
| /* If the job exited because of SIGINT, make sure the shell acts as if |
| it had received one also. */ |
| if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT)) |
| { |
| |
| if (maybe_call_trap_handler (SIGINT) == 0) |
| { |
| if (temp_handler == SIG_DFL) |
| termination_unwind_protect (SIGINT); |
| else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN) |
| (*temp_handler) (SIGINT); |
| } |
| } |
| } |
| |
| /* Default return value. */ |
| /* ``a full 8 bits of status is returned'' */ |
| return_val = process_exit_status (status); |
| |
| #if !defined (DONT_REPORT_SIGPIPE) |
| if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && |
| (WTERMSIG (status) != SIGINT)) |
| #else |
| if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) && |
| (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE)) |
| #endif |
| { |
| fprintf (stderr, "%s", strsignal (WTERMSIG (status))); |
| if (WIFCORED (status)) |
| fprintf (stderr, " (core dumped)"); |
| fprintf (stderr, "\n"); |
| } |
| |
| if (interactive_shell && subshell_environment == 0) |
| { |
| if (WIFSIGNALED (status) || WIFSTOPPED (status)) |
| set_tty_state (); |
| else |
| get_tty_state (); |
| } |
| |
| return (return_val); |
| } |
| |
| /* Give PID SIGNAL. This determines what job the pid belongs to (if any). |
| If PID does belong to a job, and the job is stopped, then CONTinue the |
| job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null, |
| then kill the process group associated with PID. */ |
| int |
| kill_pid (pid, signal, group) |
| pid_t pid; |
| int signal, group; |
| { |
| int result; |
| |
| result = group ? killpg (pid, signal) : kill (pid, signal); |
| return (result); |
| } |
| |
| static TTYSTRUCT shell_tty_info; |
| static int got_tty_state; |
| |
| /* Fill the contents of shell_tty_info with the current tty info. */ |
| get_tty_state () |
| { |
| int tty; |
| |
| tty = input_tty (); |
| if (tty != -1) |
| { |
| ttgetattr (tty, &shell_tty_info); |
| got_tty_state = 1; |
| if (check_window_size) |
| get_new_window_size (0); |
| } |
| } |
| |
| /* Make the current tty use the state in shell_tty_info. */ |
| int |
| set_tty_state () |
| { |
| int tty; |
| |
| tty = input_tty (); |
| if (tty != -1) |
| { |
| if (got_tty_state == 0) |
| return 0; |
| ttsetattr (tty, &shell_tty_info); |
| } |
| return 0; |
| } |
| |
| /* Give the terminal to PGRP. */ |
| give_terminal_to (pgrp, force) |
| pid_t pgrp; |
| int force; |
| { |
| } |
| |
| /* Stop a pipeline. */ |
| stop_pipeline (async, ignore) |
| int async; |
| COMMAND *ignore; |
| { |
| already_making_children = 0; |
| } |
| |
| void |
| start_pipeline () |
| { |
| already_making_children = 1; |
| } |
| |
| int |
| get_job_by_pid (pid, block) |
| pid_t pid; |
| int block; |
| { |
| int i; |
| |
| i = find_index_by_pid (pid); |
| return ((i == NO_PID) ? PROC_BAD : i); |
| } |
| |
| /* Print descriptive information about the job with leader pid PID. */ |
| void |
| describe_pid (pid) |
| pid_t pid; |
| { |
| fprintf (stderr, "%d\n", (int) pid); |
| } |
| |
| void |
| unfreeze_jobs_list () |
| { |
| } |
| |
| int |
| count_all_jobs () |
| { |
| return 0; |
| } |