2 Concurrent shell support for the Midnight Commander
4 Copyright (C) 1994-2020
5 Free Software Foundation, Inc.
8 Alexander Kriegisch <Alexander@Kriegisch.name>
9 Aliaksey Kandratsenka <alk@tut.by>
10 Andreas Mohr <and@gmx.li>
11 Andrew Borodin <aborodin@vmail.ru>
12 Andrew V. Samoilov <sav@bcs.zp.ua>
13 Chris Owen <chris@candu.co.uk>
14 Claes Nästén <me@pekdon.net>
15 Egmont Koblinger <egmont@gmail.com>
16 Enrico Weigelt, metux IT service <weigelt@metux.de>
17 Eric Roberts <ericmrobertsdeveloper@gmail.com>
18 Igor Urazov <z0rc3r@gmail.com>
19 Ilia Maslakov <il.smind@gmail.com>
20 Leonard den Ottolander <leonard@den.ottolander.nl>
21 Miguel de Icaza <miguel@novell.com>
22 Mikhail S. Pobolovets <styx.mp@gmail.com>
23 Norbert Warmuth <nwarmuth@privat.circular.de>
24 Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
25 Patrick Winnertz <winnie@debian.org>
26 Pavel Machek <pavel@suse.cz>
27 Pavel Roskin <proski@gnu.org>
28 Pavel Tsekov <ptsekov@gmx.net>
29 Roland Illig <roland.illig@gmx.de>
30 Sergei Trofimovich <slyfox@inbox.ru>
31 Slava Zanko <slavazanko@gmail.com>
32 Timur Bakeyev <mc@bat.ru>
33 Vit Rosin <vit_r@list.ru>
35 This file is part of the Midnight Commander.
37 The Midnight Commander is free software: you can redistribute it
38 and/or modify it under the terms of the GNU General Public License as
39 published by the Free Software Foundation, either version 3 of the License,
40 or (at your option) any later version.
42 The Midnight Commander is distributed in the hope that it will be useful,
43 but WITHOUT ANY WARRANTY; without even the implied warranty of
44 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
45 GNU General Public License for more details.
47 You should have received a copy of the GNU General Public License
48 along with this program. If not, see <http://www.gnu.org/licenses/>.
52 * \brief Source: concurrent shell support
67 #ifdef HAVE_SYS_SELECT_H
68 #include <sys/select.h>
73 #include <sys/types.h>
75 #ifdef HAVE_SYS_IOCTL_H
76 #include <sys/ioctl.h>
81 #include <stropts.h> /* For I_PUSH */
82 #endif /* HAVE_STROPTS_H */
85 /* includes for openpty() */
92 /* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0. */
96 #endif /* HAVE_OPENPTY */
98 #include "lib/global.h"
100 #include "lib/unixcompat.h"
101 #include "lib/tty/tty.h" /* LINES */
102 #include "lib/tty/key.h" /* XCTRL */
103 #include "lib/vfs/vfs.h"
104 #include "lib/strutil.h"
105 #include "lib/mcconfig.h"
106 #include "lib/util.h"
107 #include "lib/widget.h"
109 #include "src/filemanager/layout.h" /* setup_cmdline() */
110 #include "src/filemanager/command.h" /* cmdline */
112 #include "subshell.h"
113 #include "internal.h"
115 /*** global variables ****************************************************************************/
117 /* State of the subshell:
118 * INACTIVE: the default state; awaiting a command
119 * ACTIVE: remain in the shell until the user hits 'subshell_switch_key'
120 * RUNNING_COMMAND: return to MC when the current command finishes */
121 enum subshell_state_enum subshell_state
;
123 /* Holds the latest prompt captured from the subshell */
124 GString
*subshell_prompt
= NULL
;
126 /* Subshell: if set, then the prompt was not saved on CONSOLE_SAVE */
127 /* We need to paint it after CONSOLE_RESTORE, see: load_prompt */
128 gboolean update_subshell_prompt
= FALSE
;
130 /* If set, then a command has just finished executing, and we need */
131 /* to be on the lookout for a new prompt string from the subshell. */
132 gboolean should_read_new_subshell_prompt
;
134 /*** file scope macro definitions ****************************************************************/
137 #define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
141 #define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
144 /* Initial length of the buffer for the subshell's prompt */
145 #define INITIAL_PROMPT_SIZE 10
147 /* Used by the child process to indicate failure to start the subshell */
148 #define FORK_FAILURE 69 /* Arbitrary */
150 /* Length of the buffer for all I/O with the subshell */
151 #define PTY_BUFFER_SIZE BUF_SMALL /* Arbitrary; but keep it >= 80 */
153 /*** file scope type declarations ****************************************************************/
162 /* This is the keybinding that is sent to the shell, to make the shell send us the contents of
163 * the current command buffer. */
164 #define SHELL_BUFFER_KEYBINDING "_"
166 /* This is the keybinding that is sent to the shell, to make the shell send us the location of
168 #define SHELL_CURSOR_KEYBINDING "+"
170 /*** file scope variables ************************************************************************/
172 /* tcsh closes all non-standard file descriptors, so we have to use a pipe */
173 static char tcsh_fifo
[128];
175 static int subshell_pty_slave
= -1;
177 /* The key for switching back to MC from the subshell */
179 static const char subshell_switch_key
= XCTRL ('o') & 255;
182 /* For reading/writing on the subshell's pty */
183 static char pty_buffer
[PTY_BUFFER_SIZE
] = "\0";
185 /* To pass CWD info from the subshell to MC */
186 static int subshell_pipe
[2];
188 /* To pass command buffer info from the subshell to MC */
189 static int command_buffer_pipe
[2];
191 /* The subshell's process ID */
192 static pid_t subshell_pid
= 1;
194 /* One extra char for final '\n' */
195 static char subshell_cwd
[MC_MAXPATHLEN
+ 1];
197 /* Flag to indicate whether the subshell is ready for next command */
198 static int subshell_ready
;
200 /* Flag to indicate if the subshell supports the persistent buffer feature. */
201 static gboolean use_persistent_buffer
= FALSE
;
203 /* Flag to indicate if the contents of the subshell command line need to be cleared before */
204 /* executing a command. This should only end up set to true if there is some sort of error. */
205 /* This allows us to recover gracefully from an error. */
206 static gboolean subshell_should_clear_command_line
= FALSE
;
208 /* This is the local variable where the subshell prompt is stored while we are working on it. */
209 static GString
*subshell_prompt_temp_buffer
= NULL
;
211 /* The following two flags can be changed by the SIGCHLD handler. This is */
212 /* OK, because the 'int' type is updated atomically on all known machines */
213 static volatile int subshell_alive
, subshell_stopped
;
215 /* We store the terminal's initial mode here so that we can configure
216 the pty similarly, and also so we can restore the real terminal to
217 sanity if we have to exit abruptly */
218 static struct termios shell_mode
;
220 /* This is a transparent mode for the terminal where MC is running on */
221 /* It is used when the shell is active, so that the control signals */
222 /* are delivered to the shell pty */
223 static struct termios raw_mode
;
225 /* --------------------------------------------------------------------------------------------- */
226 /*** file scope functions ************************************************************************/
227 /* --------------------------------------------------------------------------------------------- */
229 * Write all data, even if the write() call is interrupted.
233 write_all (int fd
, const void *buf
, size_t count
)
241 ret
= write (fd
, (const unsigned char *) buf
+ written
, count
);
246 if (tty_got_winch ())
247 tty_change_screen_size ();
252 return written
> 0 ? written
: ret
;
260 /* --------------------------------------------------------------------------------------------- */
262 * Prepare child process to running the shell and run it.
264 * Modifies the global variables (in the child process only):
271 init_subshell_child (const char *pty_name
)
273 char *init_file
= NULL
;
274 char *putenv_str
= NULL
;
278 setsid (); /* Get a fresh terminal session */
280 /* Make sure that it has become our controlling terminal */
282 /* Redundant on Linux and probably most systems, but just in case: */
285 ioctl (subshell_pty_slave
, TIOCSCTTY
, 0);
288 /* Configure its terminal modes and window size */
290 /* Set up the pty with the same termios flags as our own tty */
291 if (tcsetattr (subshell_pty_slave
, TCSANOW
, &shell_mode
))
293 fprintf (stderr
, "Cannot set pty terminal modes: %s\r\n", unix_error_string (errno
));
294 my_exit (FORK_FAILURE
);
297 /* Set the pty's size (80x25 by default on Linux) according to the */
298 /* size of the real terminal as calculated by ncurses, if possible */
299 tty_resize (subshell_pty_slave
);
301 /* Set up the subshell's environment and init file name */
303 /* It simplifies things to change to our home directory here, */
304 /* and the user's startup file may do a 'cd' command anyway */
308 ret
= chdir (mc_config_get_home_dir ()); /* FIXME? What about when we re-run the subshell? */
312 /* Set MC_SID to prevent running one mc from another */
316 char sid_str
[BUF_SMALL
];
318 g_snprintf (sid_str
, sizeof (sid_str
), "MC_SID=%ld", (long) mc_sid
);
319 putenv (g_strdup (sid_str
));
322 switch (mc_global
.shell
->type
)
325 /* Do we have a custom init file ~/.local/share/mc/bashrc? */
326 init_file
= mc_config_get_full_path ("bashrc");
328 /* Otherwise use ~/.bashrc */
329 if (!exist_file (init_file
))
332 init_file
= g_strdup (".bashrc");
335 /* Make MC's special commands not show up in bash's history and also suppress
336 * consecutive identical commands*/
337 putenv ((char *) "HISTCONTROL=ignoreboth");
339 /* Allow alternative readline settings for MC */
343 input_file
= mc_config_get_full_path ("inputrc");
344 if (exist_file (input_file
))
346 putenv_str
= g_strconcat ("INPUTRC=", input_file
, (char *) NULL
);
354 case SHELL_ASH_BUSYBOX
:
356 /* Do we have a custom init file ~/.local/share/mc/ashrc? */
357 init_file
= mc_config_get_full_path ("ashrc");
359 /* Otherwise use ~/.profile */
360 if (!exist_file (init_file
))
363 init_file
= g_strdup (".profile");
366 /* Put init file to ENV variable used by ash */
367 putenv_str
= g_strconcat ("ENV=", init_file
, (char *) NULL
);
369 /* Do not use "g_free (putenv_str)" here, otherwise ENV will be undefined! */
373 /* TODO: Find a way to pass initfile to TCSH, ZSH and FISH */
380 fprintf (stderr
, __FILE__
": unimplemented subshell type %u\r\n", mc_global
.shell
->type
);
381 my_exit (FORK_FAILURE
);
384 /* Attach all our standard file descriptors to the pty */
386 /* This is done just before the exec, because stderr must still */
387 /* be connected to the real tty during the above error messages; */
388 /* otherwise the user will never see them. */
390 dup2 (subshell_pty_slave
, STDIN_FILENO
);
391 dup2 (subshell_pty_slave
, STDOUT_FILENO
);
392 dup2 (subshell_pty_slave
, STDERR_FILENO
);
394 close (subshell_pipe
[READ
]);
396 if (use_persistent_buffer
)
397 close (command_buffer_pipe
[READ
]);
399 close (subshell_pty_slave
); /* These may be FD_CLOEXEC, but just in case... */
400 /* Close master side of pty. This is important; apart from */
401 /* freeing up the descriptor for use in the subshell, it also */
402 /* means that when MC exits, the subshell will get a SIGHUP and */
403 /* exit too, because there will be no more descriptors pointing */
404 /* at the master side of the pty and so it will disappear. */
405 close (mc_global
.tty
.subshell_pty
);
407 /* Execute the subshell at last */
409 switch (mc_global
.shell
->type
)
412 execl (mc_global
.shell
->path
, "bash", "-rcfile", init_file
, (char *) NULL
);
416 /* Use -g to exclude cmds beginning with space from history
417 * and -Z to use the line editor on non-interactive term */
418 execl (mc_global
.shell
->path
, "zsh", "-Z", "-g", (char *) NULL
);
422 case SHELL_ASH_BUSYBOX
:
426 execl (mc_global
.shell
->path
, mc_global
.shell
->path
, (char *) NULL
);
433 /* If we get this far, everything failed miserably */
436 my_exit (FORK_FAILURE
);
439 /* --------------------------------------------------------------------------------------------- */
444 static gboolean initialized
= FALSE
;
446 /* MC calls tty_reset_shell_mode() in pre_exec() to set the real tty to its */
447 /* original settings. However, here we need to make this tty very raw, */
448 /* so that all keyboard signals, XON/XOFF, etc. will get through to the */
449 /* pty. So, instead of changing the code for execute(), pre_exec(), */
450 /* etc, we just set up the modes we need here, before each command. */
452 if (!initialized
) /* First time: initialise 'raw_mode' */
454 tcgetattr (STDOUT_FILENO
, &raw_mode
);
455 raw_mode
.c_lflag
&= ~ICANON
; /* Disable line-editing chars, etc. */
456 raw_mode
.c_lflag
&= ~ISIG
; /* Disable intr, quit & suspend chars */
457 raw_mode
.c_lflag
&= ~ECHO
; /* Disable input echoing */
458 raw_mode
.c_iflag
&= ~IXON
; /* Pass ^S/^Q to subshell undisturbed */
459 raw_mode
.c_iflag
&= ~ICRNL
; /* Don't translate CRs into LFs */
460 raw_mode
.c_oflag
&= ~OPOST
; /* Don't postprocess output */
461 raw_mode
.c_cc
[VTIME
] = 0; /* IE: wait forever, and return as */
462 raw_mode
.c_cc
[VMIN
] = 1; /* soon as a character is available */
467 /* --------------------------------------------------------------------------------------------- */
469 * Wait until the subshell dies or stops. If it stops, make it resume.
470 * Possibly modifies the globals 'subshell_alive' and 'subshell_stopped'
476 sigset_t sigchld_mask
, old_mask
;
478 sigemptyset (&sigchld_mask
);
479 sigaddset (&sigchld_mask
, SIGCHLD
);
480 sigprocmask (SIG_BLOCK
, &sigchld_mask
, &old_mask
);
483 * SIGCHLD should not be blocked, but we unblock it just in case.
484 * This is known to be useful for cygwin 1.3.12 and older.
486 sigdelset (&old_mask
, SIGCHLD
);
488 /* Wait until the subshell has stopped */
489 while (subshell_alive
&& !subshell_stopped
)
490 sigsuspend (&old_mask
);
492 if (subshell_state
!= ACTIVE
)
494 /* Discard all remaining data from stdin to the subshell */
495 tcflush (subshell_pty_slave
, TCIFLUSH
);
498 subshell_stopped
= FALSE
;
499 kill (subshell_pid
, SIGCONT
);
501 sigprocmask (SIG_SETMASK
, &old_mask
, NULL
);
502 /* We can't do any better without modifying the shell(s) */
505 /* --------------------------------------------------------------------------------------------- */
506 /* Get the contents of the current subshell command line buffer, and */
507 /* transfer the contents to the panel command prompt. */
510 read_command_line_buffer (gboolean test_mode
)
512 char subshell_command_buffer
[BUF_LARGE
];
513 char subshell_cursor_buffer
[BUF_SMALL
];
518 struct timeval subshell_prompt_timer
= { 0, 0 };
519 int command_buffer_length
;
520 int command_buffer_char_length
;
526 if (!use_persistent_buffer
)
530 FD_SET (command_buffer_pipe
[READ
], &read_set
);
531 maxfdp
= command_buffer_pipe
[READ
];
533 /* First, flush the command buffer pipe. This pipe shouldn't be written
534 * to under normal circumstances, but if it somehow does get written
535 * to, we need to make sure to discard whatever data is there before
536 * we try to use it. */
537 while ((rc
= select (maxfdp
+ 1, &read_set
, NULL
, NULL
, &subshell_prompt_timer
)) != 0)
549 bytes
= read (command_buffer_pipe
[READ
], subshell_command_buffer
,
550 sizeof (subshell_command_buffer
));
555 /* get contents of command line buffer */
556 write_all (mc_global
.tty
.subshell_pty
, ESC_STR SHELL_BUFFER_KEYBINDING
,
557 sizeof (ESC_STR SHELL_CURSOR_KEYBINDING
) - 1);
559 subshell_prompt_timer
.tv_sec
= 1;
561 FD_SET (command_buffer_pipe
[READ
], &read_set
);
563 while ((rc
= select (maxfdp
+ 1, &read_set
, NULL
, NULL
, &subshell_prompt_timer
)) != 1)
578 read (command_buffer_pipe
[READ
], subshell_command_buffer
, sizeof (subshell_command_buffer
));
579 if (bytes
== 0 || bytes
== sizeof (subshell_command_buffer
))
582 command_buffer_char_length
= bytes
- 1;
583 subshell_command_buffer
[command_buffer_char_length
] = '\0';
584 command_buffer_length
= str_length (subshell_command_buffer
);
586 /* get cursor position */
587 write_all (mc_global
.tty
.subshell_pty
, ESC_STR SHELL_CURSOR_KEYBINDING
,
588 sizeof (ESC_STR SHELL_CURSOR_KEYBINDING
) - 1);
590 subshell_prompt_timer
.tv_sec
= 1;
591 subshell_prompt_timer
.tv_usec
= 0;
593 FD_SET (command_buffer_pipe
[READ
], &read_set
);
595 while ((rc
= select (maxfdp
+ 1, &read_set
, NULL
, NULL
, &subshell_prompt_timer
)) != 1)
610 read (command_buffer_pipe
[READ
], subshell_cursor_buffer
, sizeof (subshell_cursor_buffer
));
614 subshell_cursor_buffer
[bytes
- 1] = '\0';
615 if (mc_global
.shell
->type
== SHELL_BASH
)
617 if (sscanf (subshell_cursor_buffer
, "%d:%d", &bash_version
, &cursor_position
) != 2)
622 if (sscanf (subshell_cursor_buffer
, "%d", &cursor_position
) != 1)
630 /* Substitute non-text characters in the command buffer, such as tab, or newline, as this
631 * could cause problems. */
632 for (i
= 0; i
< command_buffer_char_length
; i
++)
633 if ((unsigned char) subshell_command_buffer
[i
] < 32
634 || (unsigned char) subshell_command_buffer
[i
] == 127)
635 subshell_command_buffer
[i
] = ' ';
637 input_assign_text (cmdline
, "");
638 input_insert (cmdline
, subshell_command_buffer
, FALSE
);
640 if (bash_version
< 5) /* implies SHELL_BASH */
642 /* We need to do this because bash < v5 gives the cursor position in a utf-8 string based
643 * on the location in bytes, not in unicode characters. */
646 curr
= subshell_command_buffer
;
647 stop
= curr
+ cursor_position
;
649 for (cursor_position
= 0; curr
< stop
; cursor_position
++)
650 str_next_char_safe (&curr
);
652 if (cursor_position
> command_buffer_length
)
653 cursor_position
= command_buffer_length
;
654 cmdline
->point
= cursor_position
;
655 /* We send any remaining data to STDOUT before we finish. */
656 flush_subshell (0, VISIBLY
);
658 /* Now we erase the current contents of the command line buffer */
659 if (mc_global
.shell
->type
!= SHELL_ZSH
)
661 /* In zsh, we can just press c-u to clear the line, without needing to go to the end of
662 * the line first first. In all other shells, we must go to the end of the line first. */
664 /* If we are not at the end of the line, we go to the end. */
665 if (cursor_position
!= command_buffer_length
)
667 write_all (mc_global
.tty
.subshell_pty
, "\005", 1);
668 if (flush_subshell (1, VISIBLY
) != 1)
673 if (command_buffer_length
> 0)
675 /* Now we clear the line. */
676 write_all (mc_global
.tty
.subshell_pty
, "\025", 1);
677 if (flush_subshell (1, VISIBLY
) != 1)
684 /* --------------------------------------------------------------------------------------------- */
687 clear_subshell_prompt_string (void)
689 if (subshell_prompt_temp_buffer
!= NULL
)
690 g_string_set_size (subshell_prompt_temp_buffer
, 0);
693 /* --------------------------------------------------------------------------------------------- */
696 parse_subshell_prompt_string (const char *buffer
, int bytes
)
700 if (mc_global
.mc_run_mode
!= MC_RUN_FULL
)
703 /* First time through */
704 if (subshell_prompt
== NULL
)
705 subshell_prompt
= g_string_sized_new (INITIAL_PROMPT_SIZE
);
706 if (subshell_prompt_temp_buffer
== NULL
)
707 subshell_prompt_temp_buffer
= g_string_sized_new (INITIAL_PROMPT_SIZE
);
709 /* Extract the prompt from the shell output */
710 for (i
= 0; i
< bytes
; i
++)
711 if (buffer
[i
] == '\n' || buffer
[i
] == '\r')
712 g_string_set_size (subshell_prompt_temp_buffer
, 0);
713 else if (buffer
[i
] != '\0')
714 g_string_append_c (subshell_prompt_temp_buffer
, buffer
[i
]);
717 /* --------------------------------------------------------------------------------------------- */
720 set_prompt_string (void)
722 if (mc_global
.mc_run_mode
!= MC_RUN_FULL
)
725 if (subshell_prompt_temp_buffer
->len
!= 0)
726 g_string_assign (subshell_prompt
, subshell_prompt_temp_buffer
->str
);
731 /* --------------------------------------------------------------------------------------------- */
732 /** Feed the subshell our keyboard input until it says it's finished */
735 feed_subshell (int how
, gboolean fail_on_error
)
737 fd_set read_set
; /* For 'select' */
738 int bytes
; /* For the return value from 'read' */
739 int i
; /* Loop counter */
741 struct timeval wtime
; /* Maximum time we wait for the subshell */
742 struct timeval
*wptr
;
744 should_read_new_subshell_prompt
= FALSE
;
745 subshell_should_clear_command_line
= FALSE
;
747 /* we wait up to 10 seconds if fail_on_error, forever otherwise */
750 wptr
= fail_on_error
? &wtime
: NULL
;
759 /* Prepare the file-descriptor set and call 'select' */
762 FD_SET (mc_global
.tty
.subshell_pty
, &read_set
);
763 FD_SET (subshell_pipe
[READ
], &read_set
);
764 maxfdp
= MAX (mc_global
.tty
.subshell_pty
, subshell_pipe
[READ
]);
767 FD_SET (STDIN_FILENO
, &read_set
);
768 maxfdp
= MAX (maxfdp
, STDIN_FILENO
);
771 if (select (maxfdp
+ 1, &read_set
, NULL
, NULL
, wptr
) == -1)
773 /* Despite using SA_RESTART, we still have to check for this */
776 if (tty_got_winch ())
777 tty_change_screen_size ();
779 continue; /* try all over again */
781 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
782 fprintf (stderr
, "select (FD_SETSIZE, &read_set...): %s\r\n",
783 unix_error_string (errno
));
787 if (FD_ISSET (mc_global
.tty
.subshell_pty
, &read_set
))
788 /* Read from the subshell, write to stdout */
790 /* This loop improves performance by reducing context switches
791 by a factor of 20 or so... unfortunately, it also hangs MC
792 randomly, because of an apparent Linux bug. Investigate. */
793 /* for (i=0; i<5; ++i) * FIXME -- experimental */
795 bytes
= read (mc_global
.tty
.subshell_pty
, pty_buffer
, sizeof (pty_buffer
));
797 /* The subshell has died */
798 if (bytes
== -1 && errno
== EIO
&& !subshell_alive
)
804 /* On IBM i, read(1) can return 0 for a non-closed fd */
807 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
808 fprintf (stderr
, "read (subshell_pty...): %s\r\n", unix_error_string (errno
));
814 write_all (STDOUT_FILENO
, pty_buffer
, bytes
);
816 if (should_read_new_subshell_prompt
)
817 parse_subshell_prompt_string (pty_buffer
, bytes
);
820 else if (FD_ISSET (subshell_pipe
[READ
], &read_set
))
821 /* Read the subshell's CWD and capture its prompt */
823 bytes
= read (subshell_pipe
[READ
], subshell_cwd
, sizeof (subshell_cwd
));
826 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
827 fprintf (stderr
, "read (subshell_pipe[READ]...): %s\r\n",
828 unix_error_string (errno
));
832 subshell_cwd
[bytes
- 1] = '\0'; /* Squash the final '\n' */
836 clear_subshell_prompt_string ();
837 should_read_new_subshell_prompt
= TRUE
;
838 subshell_ready
= TRUE
;
839 if (subshell_state
== RUNNING_COMMAND
)
841 subshell_state
= INACTIVE
;
846 else if (FD_ISSET (STDIN_FILENO
, &read_set
))
847 /* Read from stdin, write to the subshell */
849 should_read_new_subshell_prompt
= FALSE
;
850 bytes
= read (STDIN_FILENO
, pty_buffer
, sizeof (pty_buffer
));
853 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
855 "read (STDIN_FILENO, pty_buffer...): %s\r\n", unix_error_string (errno
));
859 for (i
= 0; i
< bytes
; ++i
)
860 if (pty_buffer
[i
] == subshell_switch_key
)
862 write_all (mc_global
.tty
.subshell_pty
, pty_buffer
, i
);
866 subshell_state
= INACTIVE
;
867 set_prompt_string ();
868 if (subshell_ready
&& !read_command_line_buffer (FALSE
))
870 /* If we got here, some unforseen error must have occurred. */
871 flush_subshell (0, VISIBLY
);
872 input_assign_text (cmdline
, "");
873 subshell_should_clear_command_line
= TRUE
;
880 write_all (mc_global
.tty
.subshell_pty
, pty_buffer
, bytes
);
882 if (pty_buffer
[bytes
- 1] == '\n' || pty_buffer
[bytes
- 1] == '\r')
884 /* We should only clear the command line if we are using a shell that works
885 * with persistent command buffer, otherwise we get awkward results. */
886 if (use_persistent_buffer
)
887 input_assign_text (cmdline
, "");
888 subshell_ready
= FALSE
;
896 /* --------------------------------------------------------------------------------------------- */
897 /* pty opening functions */
903 /* System V version of pty_open_master */
906 pty_open_master (char *pty_name
)
911 #ifdef HAVE_POSIX_OPENPT
912 pty_master
= posix_openpt (O_RDWR
);
913 #elif defined HAVE_GETPT
914 /* getpt () is a GNU extension (glibc 2.1.x) */
915 pty_master
= getpt ();
917 strcpy (pty_name
, "/dev/ptc");
918 pty_master
= open (pty_name
, O_RDWR
);
920 strcpy (pty_name
, "/dev/ptmx");
921 pty_master
= open (pty_name
, O_RDWR
);
924 if (pty_master
== -1)
927 if (grantpt (pty_master
) == -1 /* Grant access to slave */
928 || unlockpt (pty_master
) == -1 /* Clear slave's lock flag */
929 || !(slave_name
= ptsname (pty_master
))) /* Get slave's name */
934 strcpy (pty_name
, slave_name
);
938 /* --------------------------------------------------------------------------------------------- */
939 /** System V version of pty_open_slave */
942 pty_open_slave (const char *pty_name
)
946 pty_slave
= open (pty_name
, O_RDWR
);
949 fprintf (stderr
, "open (%s, O_RDWR): %s\r\n", pty_name
, unix_error_string (errno
));
952 #if !defined(__osf__) && !defined(__linux__)
953 #if defined (I_FIND) && defined (I_PUSH)
954 if (ioctl (pty_slave
, I_FIND
, "ptem") == 0)
955 if (ioctl (pty_slave
, I_PUSH
, "ptem") == -1)
957 fprintf (stderr
, "ioctl (%d, I_PUSH, \"ptem\") failed: %s\r\n",
958 pty_slave
, unix_error_string (errno
));
963 if (ioctl (pty_slave
, I_FIND
, "ldterm") == 0)
964 if (ioctl (pty_slave
, I_PUSH
, "ldterm") == -1)
967 "ioctl (%d, I_PUSH, \"ldterm\") failed: %s\r\n",
968 pty_slave
, unix_error_string (errno
));
972 #if !defined(sgi) && !defined(__sgi)
973 if (ioctl (pty_slave
, I_FIND
, "ttcompat") == 0)
974 if (ioctl (pty_slave
, I_PUSH
, "ttcompat") == -1)
977 "ioctl (%d, I_PUSH, \"ttcompat\") failed: %s\r\n",
978 pty_slave
, unix_error_string (errno
));
982 #endif /* sgi || __sgi */
983 #endif /* I_FIND && I_PUSH */
984 #endif /* __osf__ || __linux__ */
986 fcntl (pty_slave
, F_SETFD
, FD_CLOEXEC
);
990 #else /* !HAVE_GRANTPT */
992 /* --------------------------------------------------------------------------------------------- */
993 /** BSD version of pty_open_master */
995 pty_open_master (char *pty_name
)
998 const char *ptr1
, *ptr2
;
1000 strcpy (pty_name
, "/dev/ptyXX");
1001 for (ptr1
= "pqrstuvwxyzPQRST"; *ptr1
; ++ptr1
)
1003 pty_name
[8] = *ptr1
;
1004 for (ptr2
= "0123456789abcdef"; *ptr2
!= '\0'; ++ptr2
)
1006 pty_name
[9] = *ptr2
;
1008 /* Try to open master */
1009 pty_master
= open (pty_name
, O_RDWR
);
1010 if (pty_master
== -1)
1012 if (errno
== ENOENT
) /* Different from EIO */
1013 return -1; /* Out of pty devices */
1014 continue; /* Try next pty device */
1016 pty_name
[5] = 't'; /* Change "pty" to "tty" */
1017 if (access (pty_name
, 6) != 0)
1026 return -1; /* Ran out of pty devices */
1029 /* --------------------------------------------------------------------------------------------- */
1030 /** BSD version of pty_open_slave */
1033 pty_open_slave (const char *pty_name
)
1036 struct group
*group_info
;
1038 group_info
= getgrnam ("tty");
1039 if (group_info
!= NULL
)
1041 /* The following two calls will only succeed if we are root */
1042 /* [Commented out while permissions problem is investigated] */
1043 /* chown (pty_name, getuid (), group_info->gr_gid); FIXME */
1044 /* chmod (pty_name, S_IRUSR | S_IWUSR | S_IWGRP); FIXME */
1046 pty_slave
= open (pty_name
, O_RDWR
);
1047 if (pty_slave
== -1)
1048 fprintf (stderr
, "open (pty_name, O_RDWR): %s\r\n", pty_name
);
1049 fcntl (pty_slave
, F_SETFD
, FD_CLOEXEC
);
1052 #endif /* !HAVE_GRANTPT */
1054 #endif /* !HAVE_OPENPTY */
1056 /* --------------------------------------------------------------------------------------------- */
1058 * Set up `precmd' or equivalent for reading the subshell's CWD.
1060 * Attention! Never forget that these are *one-liners* even though the concatenated
1061 * substrings contain line breaks and indentation for better understanding of the
1062 * shell code. It is vital that each one-liner ends with a line feed character ("\n" ).
1064 * @return initialized pre-command string
1068 init_subshell_precmd (char *precmd
, size_t buff_size
)
1070 switch (mc_global
.shell
->type
)
1073 g_snprintf (precmd
, buff_size
,
1074 " mc_print_command_buffer () { printf \"%%s\\\\n\" \"$READLINE_LINE\" >&%d; }\n"
1075 " bind -x '\"\\e" SHELL_BUFFER_KEYBINDING
"\":\"mc_print_command_buffer\"'\n"
1076 " bind -x '\"\\e" SHELL_CURSOR_KEYBINDING
1077 "\":\"echo $BASH_VERSINFO:$READLINE_POINT >&%d\"'\n"
1078 " PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND\n}'pwd>&%d;kill -STOP $$'\n"
1079 "PS1='\\u@\\h:\\w\\$ '\n", command_buffer_pipe
[WRITE
],
1080 command_buffer_pipe
[WRITE
], subshell_pipe
[WRITE
]);
1083 case SHELL_ASH_BUSYBOX
:
1084 /* BusyBox ash needs a somewhat complicated precmd emulation via PS1, and it is vital
1085 * that BB be built with active CONFIG_ASH_EXPAND_PRMT, but this is the default anyway.
1087 * A: This leads to a stopped subshell (=frozen mc) if user calls "ash" command
1088 * "PS1='$(pwd>&%d; kill -STOP $$)\\u@\\h:\\w\\$ '\n",
1090 * B: This leads to "sh: precmd: not found" in sub-subshell if user calls "ash" command
1091 * "precmd() { pwd>&%d; kill -STOP $$; }; "
1092 * "PS1='$(precmd)\\u@\\h:\\w\\$ '\n",
1094 * C: This works if user calls "ash" command because in sub-subshell
1095 * PRECMD is undefined, thus evaluated to empty string - no damage done.
1096 * Attention: BusyBox must be built with FEATURE_EDITING_FANCY_PROMPT to
1097 * permit \u, \w, \h, \$ escape sequences. Unfortunately this cannot be guaranteed,
1098 * especially on embedded systems where people try to save space, so let's use
1099 * the dash version below. It should work on virtually all systems.
1100 * "precmd() { pwd>&%d; kill -STOP $$; }; "
1102 * "PS1='$(eval $PRECMD)\\u@\\h:\\w\\$ '\n",
1105 /* Debian ash needs a precmd emulation via PS1, similar to BusyBox ash,
1106 * but does not support escape sequences for user, host and cwd in prompt.
1107 * Attention! Make sure that the buffer for precmd is big enough.
1109 * We want to have a fancy dynamic prompt with user@host:cwd just like in the BusyBox
1110 * examples above, but because replacing the home directory part of the path by "~" is
1111 * complicated, it bloats the precmd to a size > BUF_SMALL (128).
1113 * The following example is a little less fancy (home directory not replaced)
1114 * and shows the basic workings of our prompt for easier understanding:
1117 * "echo \"$USER@$(hostname -s):$PWD\"; "
1122 * "PS1='$($PRECMD)$ '\n",
1124 g_snprintf (precmd
, buff_size
,
1126 "if [ ! \"${PWD##$HOME}\" ]; then "
1129 "[ \"${PWD##$HOME/}\" = \"$PWD\" ] && MC_PWD=\"$PWD\" || MC_PWD=\"~/${PWD##$HOME/}\"; "
1131 "echo \"$USER@$(hostname -s):$MC_PWD\"; "
1134 "}; " "PRECMD=precmd; " "PS1='$($PRECMD)$ '\n", subshell_pipe
[WRITE
]);
1138 g_snprintf (precmd
, buff_size
,
1139 " mc_print_command_buffer () { printf \"%%s\\\\n\" \"$BUFFER\" >&%d; }\n"
1140 " zle -N mc_print_command_buffer\n"
1141 " bindkey '^[" SHELL_BUFFER_KEYBINDING
"' mc_print_command_buffer\n"
1142 " mc_print_cursor_position () { echo $CURSOR >&%d}\n"
1143 " zle -N mc_print_cursor_position\n"
1144 " bindkey '^[" SHELL_CURSOR_KEYBINDING
"' mc_print_cursor_position\n"
1145 " _mc_precmd(){ pwd>&%d;kill -STOP $$ }; precmd_functions+=(_mc_precmd)\n"
1146 "PS1='%%n@%%m:%%~%%# '\n",
1147 command_buffer_pipe
[WRITE
], command_buffer_pipe
[WRITE
], subshell_pipe
[WRITE
]);
1151 g_snprintf (precmd
, buff_size
,
1152 "set echo_style=both; "
1153 "set prompt='%%n@%%m:%%~%%# '; "
1154 "alias precmd 'echo -n;echo $cwd:q >>%s; kill -STOP $$'\n", tcsh_fifo
);
1157 g_snprintf (precmd
, buff_size
,
1158 " bind \\e" SHELL_BUFFER_KEYBINDING
" 'commandline >&%d';"
1159 "bind \\e" SHELL_CURSOR_KEYBINDING
" 'commandline -C >&%d';"
1160 "if not functions -q fish_prompt_mc;"
1161 "functions -e fish_right_prompt;"
1162 "functions -c fish_prompt fish_prompt_mc; end;"
1163 "function fish_prompt;"
1164 "echo \"$PWD\">&%d; fish_prompt_mc; kill -STOP %%self; end\n",
1165 command_buffer_pipe
[WRITE
], command_buffer_pipe
[WRITE
], subshell_pipe
[WRITE
]);
1173 /* --------------------------------------------------------------------------------------------- */
1175 * Carefully quote directory name to allow entering any directory safely,
1176 * no matter what weird characters it may contain in its name.
1177 * NOTE: Treat directory name an untrusted data, don't allow it to cause
1178 * executing any commands in the shell. Escape all control characters.
1179 * Use following technique:
1181 * printf(1) with format string containing a single conversion specifier,
1182 * "b", and an argument which contains a copy of the string passed to
1183 * subshell_name_quote() with all characters, except digits and letters,
1184 * replaced by the backslash-escape sequence \0nnn, where "nnn" is the
1185 * numeric value of the character converted to octal number.
1187 * cd "`printf '%b' 'ABC\0nnnDEF\0nnnXYZ'`"
1189 * N.B.: Use single quotes for conversion specifier to work around
1190 * tcsh 6.20+ parser breakage, see ticket #3852 for the details.
1194 subshell_name_quote (const char *s
)
1198 const char *quote_cmd_start
, *quote_cmd_end
;
1200 if (mc_global
.shell
->type
== SHELL_FISH
)
1202 quote_cmd_start
= "(printf '%b' '";
1203 quote_cmd_end
= "')";
1205 /* TODO: When BusyBox printf is fixed, get rid of this "else if", see
1206 http://lists.busybox.net/pipermail/busybox/2012-March/077460.html */
1207 /* else if (subshell_type == ASH_BUSYBOX)
1209 quote_cmd_start = "\"`echo -en '";
1210 quote_cmd_end = "'`\"";
1214 quote_cmd_start
= "\"`printf '%b' '";
1215 quote_cmd_end
= "'`\"";
1218 ret
= g_string_sized_new (64);
1220 /* Prevent interpreting leading '-' as a switch for 'cd' */
1222 g_string_append (ret
, "./");
1224 /* Copy the beginning of the command to the buffer */
1225 g_string_append (ret
, quote_cmd_start
);
1228 * Print every character except digits and letters as a backslash-escape
1229 * sequence of the form \0nnn, where "nnn" is the numeric value of the
1230 * character converted to octal number.
1232 for (su
= s
; su
[0] != '\0'; su
= n
)
1234 n
= str_cget_next_char_safe (su
);
1236 if (str_isalnum (su
))
1237 g_string_append_len (ret
, su
, n
- su
);
1242 for (c
= 0; c
< n
- su
; c
++)
1243 g_string_append_printf (ret
, "\\0%03o", (unsigned char) su
[c
]);
1247 g_string_append (ret
, quote_cmd_end
);
1252 /* --------------------------------------------------------------------------------------------- */
1253 /*** public functions ****************************************************************************/
1254 /* --------------------------------------------------------------------------------------------- */
1256 /* --------------------------------------------------------------------------------------------- */
1258 * Fork the subshell, and set up many, many things.
1260 * Possibly modifies the global variables:
1261 * subshell_type, subshell_alive, subshell_stopped, subshell_pid
1262 * mc_global.tty.use_subshell - Is set to FALSE if we can't run the subshell
1263 * quit - Can be set to SUBSHELL_EXIT by the SIGCHLD handler
1267 init_subshell (void)
1269 /* This must be remembered across calls to init_subshell() */
1270 static char pty_name
[BUF_SMALL
];
1271 /* Must be considerably longer than BUF_SMALL (128) to support fancy shell prompts */
1272 char precmd
[BUF_MEDIUM
];
1274 /* Take the current (hopefully pristine) tty mode and make */
1275 /* a raw mode based on it now, before we do anything else with it */
1278 if (mc_global
.tty
.subshell_pty
== 0)
1279 { /* First time through */
1280 if (mc_global
.shell
->type
== SHELL_NONE
)
1283 /* Open a pty for talking to the subshell */
1285 /* FIXME: We may need to open a fresh pty each time on SVR4 */
1288 if (openpty (&mc_global
.tty
.subshell_pty
, &subshell_pty_slave
, NULL
, NULL
, NULL
))
1290 fprintf (stderr
, "Cannot open master and slave sides of pty: %s\n",
1291 unix_error_string (errno
));
1292 mc_global
.tty
.use_subshell
= FALSE
;
1296 mc_global
.tty
.subshell_pty
= pty_open_master (pty_name
);
1297 if (mc_global
.tty
.subshell_pty
== -1)
1299 fprintf (stderr
, "Cannot open master side of pty: %s\r\n", unix_error_string (errno
));
1300 mc_global
.tty
.use_subshell
= FALSE
;
1303 subshell_pty_slave
= pty_open_slave (pty_name
);
1304 if (subshell_pty_slave
== -1)
1306 fprintf (stderr
, "Cannot open slave side of pty %s: %s\r\n",
1307 pty_name
, unix_error_string (errno
));
1308 mc_global
.tty
.use_subshell
= FALSE
;
1311 #endif /* HAVE_OPENPTY */
1313 /* Create a pipe for receiving the subshell's CWD */
1315 if (mc_global
.shell
->type
== SHELL_TCSH
)
1317 g_snprintf (tcsh_fifo
, sizeof (tcsh_fifo
), "%s/mc.pipe.%d",
1318 mc_tmpdir (), (int) getpid ());
1319 if (mkfifo (tcsh_fifo
, 0600) == -1)
1321 fprintf (stderr
, "mkfifo(%s) failed: %s\r\n", tcsh_fifo
, unix_error_string (errno
));
1322 mc_global
.tty
.use_subshell
= FALSE
;
1326 /* Opening the FIFO as O_RDONLY or O_WRONLY causes deadlock */
1328 if ((subshell_pipe
[READ
] = open (tcsh_fifo
, O_RDWR
)) == -1
1329 || (subshell_pipe
[WRITE
] = open (tcsh_fifo
, O_RDWR
)) == -1)
1331 fprintf (stderr
, _("Cannot open named pipe %s\n"), tcsh_fifo
);
1332 perror (__FILE__
": open");
1333 mc_global
.tty
.use_subshell
= FALSE
;
1337 else if (pipe (subshell_pipe
) != 0) /* subshell_type is BASH, ASH_BUSYBOX, DASH or ZSH */
1339 perror (__FILE__
": couldn't create pipe");
1340 mc_global
.tty
.use_subshell
= FALSE
;
1344 if (mc_global
.mc_run_mode
== MC_RUN_FULL
&&
1345 (mc_global
.shell
->type
== SHELL_BASH
|| mc_global
.shell
->type
== SHELL_ZSH
1346 || mc_global
.shell
->type
== SHELL_FISH
))
1347 use_persistent_buffer
= TRUE
;
1348 if (use_persistent_buffer
&& pipe (command_buffer_pipe
) != 0)
1350 perror (__FILE__
": couldn't create pipe");
1351 mc_global
.tty
.use_subshell
= FALSE
;
1356 /* Fork the subshell */
1358 subshell_alive
= TRUE
;
1359 subshell_stopped
= FALSE
;
1360 subshell_pid
= fork ();
1362 if (subshell_pid
== -1)
1364 fprintf (stderr
, "Cannot spawn the subshell process: %s\r\n", unix_error_string (errno
));
1365 /* We exit here because, if the process table is full, the */
1366 /* other method of running user commands won't work either */
1367 exit (EXIT_FAILURE
);
1370 if (subshell_pid
== 0)
1372 /* We are in the child process */
1373 init_subshell_child (pty_name
);
1376 init_subshell_precmd (precmd
, BUF_MEDIUM
);
1378 write_all (mc_global
.tty
.subshell_pty
, precmd
, strlen (precmd
));
1380 /* Wait until the subshell has started up and processed the command */
1382 subshell_state
= RUNNING_COMMAND
;
1383 tty_enable_interrupt_key ();
1384 if (!feed_subshell (QUIETLY
, TRUE
))
1385 mc_global
.tty
.use_subshell
= FALSE
;
1386 tty_disable_interrupt_key ();
1387 if (!subshell_alive
)
1388 mc_global
.tty
.use_subshell
= FALSE
; /* Subshell died instantly, so don't use it */
1390 /* Try out the persistent command buffer feature. If it doesn't work the first time, we
1391 * assume there must be something wrong with the shell, and we turn persistent buffer off
1392 * for good. This will save the user the trouble of having to wait for the persistent
1393 * buffer function to time out every time they try to close the subshell. */
1394 if (use_persistent_buffer
&& !read_command_line_buffer (TRUE
))
1395 use_persistent_buffer
= FALSE
;
1398 /* --------------------------------------------------------------------------------------------- */
1401 invoke_subshell (const char *command
, int how
, vfs_path_t
** new_dir_vpath
)
1403 /* Make the MC terminal transparent */
1404 tcsetattr (STDOUT_FILENO
, TCSANOW
, &raw_mode
);
1406 /* Make the subshell change to MC's working directory */
1407 if (new_dir_vpath
!= NULL
)
1408 do_subshell_chdir (subshell_get_cwd (), TRUE
);
1410 if (command
== NULL
) /* The user has done "C-o" from MC */
1412 if (subshell_state
== INACTIVE
)
1414 subshell_state
= ACTIVE
;
1416 /* FIXME: possibly take out this hack; the user can re-play it by hitting C-hyphen a few times! */
1417 if (subshell_ready
&& mc_global
.mc_run_mode
== MC_RUN_FULL
)
1418 write_all (mc_global
.tty
.subshell_pty
, " \b", 2); /* Hack to make prompt reappear */
1420 if (use_persistent_buffer
)
1425 /* Check to make sure there are no non text characters in the command buffer,
1426 * such as tab, or newline, as this could cause problems. */
1427 for (i
= 0; cmdline
->buffer
[i
] != '\0'; i
++)
1428 if ((unsigned char) cmdline
->buffer
[i
] < 32
1429 || (unsigned char) cmdline
->buffer
[i
] == 127)
1430 cmdline
->buffer
[i
] = ' ';
1432 /* Write the command buffer to the subshell. */
1433 write_all (mc_global
.tty
.subshell_pty
, cmdline
->buffer
, strlen (cmdline
->buffer
));
1435 /* Put the cursor in the correct place in the subshell. */
1436 pos
= str_length (cmdline
->buffer
) - cmdline
->point
;
1437 for (i
= 0; i
< (size_t) pos
; i
++)
1438 write_all (mc_global
.tty
.subshell_pty
, ESC_STR
"[D", 3);
1442 else /* MC has passed us a user command */
1444 /* Before we write to the command prompt, we need to clear whatever */
1445 /* data is there, but only if we are using one of the shells that */
1446 /* doesn't support keeping command buffer contents, OR if there was */
1447 /* some sort of error. */
1448 if (!use_persistent_buffer
|| subshell_should_clear_command_line
)
1450 write_all (mc_global
.tty
.subshell_pty
, "\003", 1);
1451 subshell_state
= RUNNING_COMMAND
;
1452 /* We need to call feed_subshell here if we are using fish, because of a quirk
1453 * in the behavioral of that particular shell. */
1454 if (mc_global
.shell
->type
!= SHELL_FISH
)
1455 feed_subshell (QUIETLY
, FALSE
);
1459 write_all (mc_global
.tty
.subshell_pty
, " ", 1);
1460 /* FIXME: if command is long (>8KB ?) we go comma */
1461 write_all (mc_global
.tty
.subshell_pty
, command
, strlen (command
));
1462 write_all (mc_global
.tty
.subshell_pty
, "\n", 1);
1463 subshell_state
= RUNNING_COMMAND
;
1464 subshell_ready
= FALSE
;
1467 feed_subshell (how
, FALSE
);
1469 if (new_dir_vpath
!= NULL
&& subshell_alive
)
1473 pcwd
= vfs_translate_path (vfs_path_as_str (subshell_get_cwd ()));
1474 if (strcmp (subshell_cwd
, pcwd
) != 0)
1475 *new_dir_vpath
= vfs_path_from_str (subshell_cwd
); /* Make MC change to the subshell's CWD */
1478 /* Restart the subshell if it has died by SIGHUP, SIGQUIT, etc. */
1479 while (!subshell_alive
&& subshell_get_mainloop_quit () == 0 && mc_global
.tty
.use_subshell
)
1482 return subshell_get_mainloop_quit ();
1485 /* --------------------------------------------------------------------------------------------- */
1488 flush_subshell (int max_wait_length
, int how
)
1492 struct timeval timeleft
= { 0, 0 };
1493 gboolean return_value
= FALSE
;
1496 timeleft
.tv_sec
= max_wait_length
;
1498 FD_SET (mc_global
.tty
.subshell_pty
, &tmp
);
1500 while (subshell_alive
1501 && (rc
= select (mc_global
.tty
.subshell_pty
+ 1, &tmp
, NULL
, NULL
, &timeleft
)) != 0)
1503 /* Check for 'select' errors */
1508 if (tty_got_winch ())
1509 tty_change_screen_size ();
1514 fprintf (stderr
, "select (FD_SETSIZE, &tmp...): %s\r\n", unix_error_string (errno
));
1515 exit (EXIT_FAILURE
);
1518 return_value
= TRUE
;
1519 timeleft
.tv_sec
= 0;
1520 timeleft
.tv_usec
= 0;
1522 bytes
= read (mc_global
.tty
.subshell_pty
, pty_buffer
, sizeof (pty_buffer
));
1524 write_all (STDOUT_FILENO
, pty_buffer
, bytes
);
1527 return return_value
;
1530 /* --------------------------------------------------------------------------------------------- */
1533 read_subshell_prompt (void)
1537 struct timeval timeleft
= { 0, 0 };
1538 gboolean should_reset_prompt
= TRUE
;
1539 gboolean got_new_prompt
= FALSE
;
1543 FD_SET (mc_global
.tty
.subshell_pty
, &tmp
);
1545 while (subshell_alive
1546 && (rc
= select (mc_global
.tty
.subshell_pty
+ 1, &tmp
, NULL
, NULL
, &timeleft
)) != 0)
1548 /* Check for 'select' errors */
1553 if (tty_got_winch ())
1554 tty_change_screen_size ();
1559 fprintf (stderr
, "select (FD_SETSIZE, &tmp...): %s\r\n", unix_error_string (errno
));
1560 exit (EXIT_FAILURE
);
1563 bytes
= read (mc_global
.tty
.subshell_pty
, pty_buffer
, sizeof (pty_buffer
));
1564 if (should_reset_prompt
)
1566 should_reset_prompt
= FALSE
;
1567 clear_subshell_prompt_string ();
1570 parse_subshell_prompt_string (pty_buffer
, bytes
);
1571 got_new_prompt
= TRUE
;
1575 set_prompt_string ();
1577 return (rc
!= 0 || bytes
!= 0);
1580 /* --------------------------------------------------------------------------------------------- */
1583 do_update_prompt (void)
1585 if (update_subshell_prompt
)
1587 if (subshell_prompt
!= NULL
)
1589 printf ("\r\n%s", subshell_prompt
->str
);
1592 update_subshell_prompt
= FALSE
;
1596 /* --------------------------------------------------------------------------------------------- */
1599 exit_subshell (void)
1601 gboolean subshell_quit
= TRUE
;
1603 if (subshell_state
!= INACTIVE
&& subshell_alive
)
1605 query_dialog (_("Warning"),
1606 _("The shell is still active. Quit anyway?"),
1607 D_NORMAL
, 2, _("&Yes"), _("&No")) == 0;
1611 if (mc_global
.shell
->type
== SHELL_TCSH
)
1613 if (unlink (tcsh_fifo
) == -1)
1614 fprintf (stderr
, "Cannot remove named pipe %s: %s\r\n",
1615 tcsh_fifo
, unix_error_string (errno
));
1618 if (subshell_prompt
!= NULL
)
1620 g_string_free (subshell_prompt
, TRUE
);
1621 subshell_prompt
= NULL
;
1624 if (subshell_prompt_temp_buffer
!= NULL
)
1626 g_string_free (subshell_prompt_temp_buffer
, TRUE
);
1627 subshell_prompt_temp_buffer
= NULL
;
1630 pty_buffer
[0] = '\0';
1633 return subshell_quit
;
1636 /* --------------------------------------------------------------------------------------------- */
1638 /** If it actually changed the directory it returns true */
1640 do_subshell_chdir (const vfs_path_t
* vpath
, gboolean update_prompt
)
1644 pcwd
= vfs_path_to_str_flags (subshell_get_cwd (), 0, VPF_RECODE
);
1646 if (!(subshell_state
== INACTIVE
&& strcmp (subshell_cwd
, pcwd
) != 0))
1648 /* We have to repaint the subshell prompt if we read it from
1649 * the main program. Please note that in the code after this
1650 * if, the cd command that is sent will make the subshell
1651 * repaint the prompt, so we don't have to paint it. */
1653 do_update_prompt ();
1658 /* If we are using a shell that doesn't support persistent command buffer, we need to clear
1659 * the command prompt before we send the cd command. */
1660 if (!use_persistent_buffer
|| subshell_should_clear_command_line
)
1662 write_all (mc_global
.tty
.subshell_pty
, "\003", 1);
1663 subshell_state
= RUNNING_COMMAND
;
1664 if (mc_global
.shell
->type
!= SHELL_FISH
)
1665 feed_subshell (QUIETLY
, FALSE
);
1667 /* The initial space keeps this out of the command history (in bash
1668 because we set "HISTCONTROL=ignorespace") */
1669 write_all (mc_global
.tty
.subshell_pty
, " cd ", 4);
1673 const char *translate
;
1675 translate
= vfs_translate_path (vfs_path_as_str (vpath
));
1676 if (translate
!= NULL
)
1680 temp
= subshell_name_quote (translate
);
1681 write_all (mc_global
.tty
.subshell_pty
, temp
->str
, temp
->len
);
1682 g_string_free (temp
, TRUE
);
1686 write_all (mc_global
.tty
.subshell_pty
, ".", 1);
1691 write_all (mc_global
.tty
.subshell_pty
, "/", 1);
1693 write_all (mc_global
.tty
.subshell_pty
, "\n", 1);
1695 subshell_state
= RUNNING_COMMAND
;
1696 feed_subshell (QUIETLY
, FALSE
);
1700 gboolean bPathNotEq
;
1702 bPathNotEq
= strcmp (subshell_cwd
, pcwd
) != 0;
1704 if (bPathNotEq
&& mc_global
.shell
->type
== SHELL_TCSH
)
1706 char rp_subshell_cwd
[PATH_MAX
];
1707 char rp_current_panel_cwd
[PATH_MAX
];
1708 char *p_subshell_cwd
, *p_current_panel_cwd
;
1710 p_subshell_cwd
= mc_realpath (subshell_cwd
, rp_subshell_cwd
);
1711 p_current_panel_cwd
= mc_realpath (pcwd
, rp_current_panel_cwd
);
1713 if (p_subshell_cwd
== NULL
)
1714 p_subshell_cwd
= subshell_cwd
;
1715 if (p_current_panel_cwd
== NULL
)
1716 p_current_panel_cwd
= pcwd
;
1717 bPathNotEq
= strcmp (p_subshell_cwd
, p_current_panel_cwd
) != 0;
1720 if (bPathNotEq
&& !DIR_IS_DOT (pcwd
))
1724 cwd
= vfs_path_to_str_flags (subshell_get_cwd (), 0, VPF_STRIP_PASSWORD
);
1725 vfs_print_message (_("Warning: Cannot change to %s.\n"), cwd
);
1730 /* Really escape Zsh history */
1731 if (mc_global
.shell
->type
== SHELL_ZSH
)
1733 /* Per Zsh documentation last command prefixed with space lingers in the internal history
1734 * until the next command is entered before it vanishes. To make it vanish right away,
1735 * type a space and press return. */
1736 write_all (mc_global
.tty
.subshell_pty
, " \n", 2);
1737 subshell_state
= RUNNING_COMMAND
;
1738 feed_subshell (QUIETLY
, FALSE
);
1741 update_subshell_prompt
= FALSE
;
1744 /* Make sure that MC never stores the CWD in a silly format */
1745 /* like /usr////lib/../bin, or the strcmp() above will fail */
1748 /* --------------------------------------------------------------------------------------------- */
1751 subshell_get_console_attributes (void)
1753 /* Get our current terminal modes */
1755 if (tcgetattr (STDOUT_FILENO
, &shell_mode
))
1757 fprintf (stderr
, "Cannot get terminal settings: %s\r\n", unix_error_string (errno
));
1758 mc_global
.tty
.use_subshell
= FALSE
;
1762 /* --------------------------------------------------------------------------------------------- */
1764 * Figure out whether the subshell has stopped, exited or been killed
1765 * Possibly modifies: 'subshell_alive', 'subshell_stopped' and 'quit' */
1768 sigchld_handler (int sig
)
1775 pid
= waitpid (subshell_pid
, &status
, WUNTRACED
| WNOHANG
);
1777 if (pid
== subshell_pid
)
1779 /* Figure out what has happened to the subshell */
1781 if (WIFSTOPPED (status
))
1783 if (WSTOPSIG (status
) == SIGSTOP
)
1785 /* The subshell has received a SIGSTOP signal */
1786 subshell_stopped
= TRUE
;
1790 /* The user has suspended the subshell. Revive it */
1791 kill (subshell_pid
, SIGCONT
);
1796 /* The subshell has either exited normally or been killed */
1797 subshell_alive
= FALSE
;
1798 delete_select_channel (mc_global
.tty
.subshell_pty
);
1799 if (WIFEXITED (status
) && WEXITSTATUS (status
) != FORK_FAILURE
)
1802 subshell_quit
= subshell_get_mainloop_quit () | SUBSHELL_EXIT
; /* Exited normally */
1803 subshell_set_mainloop_quit (subshell_quit
);
1807 subshell_handle_cons_saver ();
1809 /* If we got here, some other child exited; ignore it */
1812 /* --------------------------------------------------------------------------------------------- */