2 Concurrent shell support for the Midnight Commander
4 Copyright (C) 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
6 The Free Software Foundation, Inc.
8 This file is part of the Midnight Commander.
10 The Midnight Commander is free software: you can redistribute it
11 and/or modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation, either version 3 of the License,
13 or (at your option) any later version.
15 The Midnight Commander is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 * \brief Source: concurrent shell support
41 #include <sys/types.h>
43 #ifdef HAVE_SYS_IOCTL_H
44 #include <sys/ioctl.h>
50 #include <stropts.h> /* For I_PUSH */
51 #endif /* HAVE_STROPTS_H */
53 #include "lib/global.h"
55 #include "lib/tty/tty.h" /* LINES */
56 #include "lib/tty/key.h" /* XCTRL */
57 #include "lib/vfs/vfs.h"
58 #include "lib/strutil.h"
59 #include "lib/mcconfig.h"
61 #include "lib/widget.h"
63 #include "filemanager/midnight.h" /* current_panel */
65 #include "consaver/cons.saver.h" /* handle_console() */
69 /*** global variables ****************************************************************************/
71 /* State of the subshell:
72 * INACTIVE: the default state; awaiting a command
73 * ACTIVE: remain in the shell until the user hits `subshell_switch_key'
74 * RUNNING_COMMAND: return to MC when the current command finishes */
75 enum subshell_state_enum subshell_state
;
77 /* Holds the latest prompt captured from the subshell */
78 char *subshell_prompt
= NULL
;
80 /* Subshell: if set, then the prompt was not saved on CONSOLE_SAVE */
81 /* We need to paint it after CONSOLE_RESTORE, see: load_prompt */
82 gboolean update_subshell_prompt
= FALSE
;
84 /*** file scope macro definitions ****************************************************************/
87 #define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
91 #define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
95 #define STDIN_FILENO 0
99 #define STDOUT_FILENO 1
102 #ifndef STDERR_FILENO
103 #define STDERR_FILENO 2
106 /* Initial length of the buffer for the subshell's prompt */
107 #define INITIAL_PROMPT_SIZE 10
109 /* Used by the child process to indicate failure to start the subshell */
110 #define FORK_FAILURE 69 /* Arbitrary */
112 /* Length of the buffer for all I/O with the subshell */
113 #define PTY_BUFFER_SIZE BUF_SMALL /* Arbitrary; but keep it >= 80 */
115 /*** file scope type declarations ****************************************************************/
124 /* Subshell type (gleaned from the SHELL environment variable, if available) */
133 /*** file scope variables ************************************************************************/
135 /* tcsh closes all non-standard file descriptors, so we have to use a pipe */
136 static char tcsh_fifo
[128];
138 static int subshell_pty_slave
= -1;
140 /* The key for switching back to MC from the subshell */
142 static const char subshell_switch_key
= XCTRL ('o') & 255;
145 /* For reading/writing on the subshell's pty */
146 static char pty_buffer
[PTY_BUFFER_SIZE
] = "\0";
148 /* To pass CWD info from the subshell to MC */
149 static int subshell_pipe
[2];
151 /* The subshell's process ID */
152 static pid_t subshell_pid
= 1;
154 /* One extra char for final '\n' */
155 static char subshell_cwd
[MC_MAXPATHLEN
+ 1];
157 /* Flag to indicate whether the subshell is ready for next command */
158 static int subshell_ready
;
160 /* The following two flags can be changed by the SIGCHLD handler. This is */
161 /* OK, because the `int' type is updated atomically on all known machines */
162 static volatile int subshell_alive
, subshell_stopped
;
164 /* We store the terminal's initial mode here so that we can configure
165 the pty similarly, and also so we can restore the real terminal to
166 sanity if we have to exit abruptly */
167 static struct termios shell_mode
;
169 /* This is a transparent mode for the terminal where MC is running on */
170 /* It is used when the shell is active, so that the control signals */
171 /* are delivered to the shell pty */
172 static struct termios raw_mode
;
174 /* This counter indicates how many characters of prompt we have read */
175 /* FIXME: try to figure out why this had to become global */
176 static int prompt_pos
;
179 /*** file scope functions ************************************************************************/
180 /* --------------------------------------------------------------------------------------------- */
182 * Write all data, even if the write() call is interrupted.
186 write_all (int fd
, const void *buf
, size_t count
)
192 ret
= write (fd
, (const unsigned char *) buf
+ written
, count
);
201 return written
> 0 ? written
: ret
;
210 /* --------------------------------------------------------------------------------------------- */
212 * Prepare child process to running the shell and run it.
214 * Modifies the global variables (in the child process only):
221 init_subshell_child (const char *pty_name
)
223 char *init_file
= NULL
;
227 setsid (); /* Get a fresh terminal session */
229 /* Make sure that it has become our controlling terminal */
231 /* Redundant on Linux and probably most systems, but just in case: */
234 ioctl (subshell_pty_slave
, TIOCSCTTY
, 0);
237 /* Configure its terminal modes and window size */
239 /* Set up the pty with the same termios flags as our own tty */
240 if (tcsetattr (subshell_pty_slave
, TCSANOW
, &shell_mode
))
242 fprintf (stderr
, "Cannot set pty terminal modes: %s\r\n", unix_error_string (errno
));
243 _exit (FORK_FAILURE
);
246 /* Set the pty's size (80x25 by default on Linux) according to the */
247 /* size of the real terminal as calculated by ncurses, if possible */
248 tty_resize (subshell_pty_slave
);
250 /* Set up the subshell's environment and init file name */
252 /* It simplifies things to change to our home directory here, */
253 /* and the user's startup file may do a `cd' command anyway */
256 ret
= chdir (mc_config_get_home_dir ()); /* FIXME? What about when we re-run the subshell? */
259 /* Set MC_SID to prevent running one mc from another */
263 char sid_str
[BUF_SMALL
];
264 g_snprintf (sid_str
, sizeof (sid_str
), "MC_SID=%ld", (long) mc_sid
);
265 putenv (g_strdup (sid_str
));
268 switch (subshell_type
)
271 init_file
= mc_config_get_full_path ("bashrc");
273 if (access (init_file
, R_OK
) == -1)
276 init_file
= g_strdup (".bashrc");
279 /* Make MC's special commands not show up in bash's history */
280 putenv ((char *) "HISTCONTROL=ignorespace");
282 /* Allow alternative readline settings for MC */
284 char *input_file
= mc_config_get_full_path ("inputrc");
285 if (access (input_file
, R_OK
) == 0)
287 char *putenv_str
= g_strconcat ("INPUTRC=", input_file
, NULL
);
296 /* TODO: Find a way to pass initfile to TCSH and ZSH */
303 fprintf (stderr
, __FILE__
": unimplemented subshell type %d\r\n", subshell_type
);
304 _exit (FORK_FAILURE
);
307 /* Attach all our standard file descriptors to the pty */
309 /* This is done just before the fork, because stderr must still */
310 /* be connected to the real tty during the above error messages; */
311 /* otherwise the user will never see them. */
313 dup2 (subshell_pty_slave
, STDIN_FILENO
);
314 dup2 (subshell_pty_slave
, STDOUT_FILENO
);
315 dup2 (subshell_pty_slave
, STDERR_FILENO
);
317 close (subshell_pipe
[READ
]);
318 close (subshell_pty_slave
); /* These may be FD_CLOEXEC, but just in case... */
319 /* Close master side of pty. This is important; apart from */
320 /* freeing up the descriptor for use in the subshell, it also */
321 /* means that when MC exits, the subshell will get a SIGHUP and */
322 /* exit too, because there will be no more descriptors pointing */
323 /* at the master side of the pty and so it will disappear. */
324 close (mc_global
.tty
.subshell_pty
);
326 /* Execute the subshell at last */
328 switch (subshell_type
)
331 execl (shell
, "bash", "-rcfile", init_file
, (char *) NULL
);
335 execl (shell
, "tcsh", (char *) NULL
);
339 /* Use -g to exclude cmds beginning with space from history
340 * and -Z to use the line editor on non-interactive term */
341 execl (shell
, "zsh", "-Z", "-g", (char *) NULL
);
346 execl (shell
, "fish", (char *) NULL
);
350 /* If we get this far, everything failed miserably */
352 _exit (FORK_FAILURE
);
356 /* --------------------------------------------------------------------------------------------- */
358 * Check MC_SID to prevent running one mc from another.
360 * 0 if no parent mc in our session was found,
361 * 1 if parent mc was found and the user wants to continue,
362 * 2 if parent mc was found and the user wants to quit mc.
368 pid_t my_sid
, old_sid
;
372 sid_str
= getenv ("MC_SID");
376 old_sid
= (pid_t
) strtol (sid_str
, NULL
, 0);
384 /* The parent mc is in a different session, it's OK */
385 if (old_sid
!= my_sid
)
388 r
= query_dialog (_("Warning"),
389 _("GNU Midnight Commander is already\n"
390 "running on this terminal.\n"
391 "Subshell support will be disabled."), D_ERROR
, 2, _("&OK"), _("&Quit"));
400 /* --------------------------------------------------------------------------------------------- */
405 static int initialized
= 0;
407 /* MC calls tty_reset_shell_mode() in pre_exec() to set the real tty to its */
408 /* original settings. However, here we need to make this tty very raw, */
409 /* so that all keyboard signals, XON/XOFF, etc. will get through to the */
410 /* pty. So, instead of changing the code for execute(), pre_exec(), */
411 /* etc, we just set up the modes we need here, before each command. */
413 if (initialized
== 0) /* First time: initialise `raw_mode' */
415 tcgetattr (STDOUT_FILENO
, &raw_mode
);
416 raw_mode
.c_lflag
&= ~ICANON
; /* Disable line-editing chars, etc. */
417 raw_mode
.c_lflag
&= ~ISIG
; /* Disable intr, quit & suspend chars */
418 raw_mode
.c_lflag
&= ~ECHO
; /* Disable input echoing */
419 raw_mode
.c_iflag
&= ~IXON
; /* Pass ^S/^Q to subshell undisturbed */
420 raw_mode
.c_iflag
&= ~ICRNL
; /* Don't translate CRs into LFs */
421 raw_mode
.c_oflag
&= ~OPOST
; /* Don't postprocess output */
422 raw_mode
.c_cc
[VTIME
] = 0; /* IE: wait forever, and return as */
423 raw_mode
.c_cc
[VMIN
] = 1; /* soon as a character is available */
428 /* --------------------------------------------------------------------------------------------- */
430 * Wait until the subshell dies or stops. If it stops, make it resume.
431 * Possibly modifies the globals `subshell_alive' and `subshell_stopped'
437 sigset_t sigchld_mask
, old_mask
;
439 sigemptyset (&sigchld_mask
);
440 sigaddset (&sigchld_mask
, SIGCHLD
);
441 sigprocmask (SIG_BLOCK
, &sigchld_mask
, &old_mask
);
444 * SIGCHLD should not be blocked, but we unblock it just in case.
445 * This is known to be useful for cygwin 1.3.12 and older.
447 sigdelset (&old_mask
, SIGCHLD
);
449 /* Wait until the subshell has stopped */
450 while (subshell_alive
&& !subshell_stopped
)
451 sigsuspend (&old_mask
);
453 if (subshell_state
!= ACTIVE
)
455 /* Discard all remaining data from stdin to the subshell */
456 tcflush (subshell_pty_slave
, TCIFLUSH
);
459 subshell_stopped
= FALSE
;
460 kill (subshell_pid
, SIGCONT
);
462 sigprocmask (SIG_SETMASK
, &old_mask
, NULL
);
463 /* We can't do any better without modifying the shell(s) */
466 /* --------------------------------------------------------------------------------------------- */
467 /** Feed the subshell our keyboard input until it says it's finished */
470 feed_subshell (int how
, int fail_on_error
)
472 fd_set read_set
; /* For `select' */
474 int bytes
; /* For the return value from `read' */
475 int i
; /* Loop counter */
477 struct timeval wtime
; /* Maximum time we wait for the subshell */
478 struct timeval
*wptr
;
480 /* we wait up to 10 seconds if fail_on_error, forever otherwise */
483 wptr
= fail_on_error
? &wtime
: NULL
;
490 /* Prepare the file-descriptor set and call `select' */
493 FD_SET (mc_global
.tty
.subshell_pty
, &read_set
);
494 FD_SET (subshell_pipe
[READ
], &read_set
);
495 maxfdp
= max (mc_global
.tty
.subshell_pty
, subshell_pipe
[READ
]);
498 FD_SET (STDIN_FILENO
, &read_set
);
499 maxfdp
= max (maxfdp
, STDIN_FILENO
);
502 if (select (maxfdp
+ 1, &read_set
, NULL
, NULL
, wptr
) == -1)
505 /* Despite using SA_RESTART, we still have to check for this */
507 continue; /* try all over again */
508 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
509 fprintf (stderr
, "select (FD_SETSIZE, &read_set...): %s\r\n",
510 unix_error_string (errno
));
514 if (FD_ISSET (mc_global
.tty
.subshell_pty
, &read_set
))
515 /* Read from the subshell, write to stdout */
517 /* This loop improves performance by reducing context switches
518 by a factor of 20 or so... unfortunately, it also hangs MC
519 randomly, because of an apparent Linux bug. Investigate. */
520 /* for (i=0; i<5; ++i) * FIXME -- experimental */
522 bytes
= read (mc_global
.tty
.subshell_pty
, pty_buffer
, sizeof (pty_buffer
));
524 /* The subshell has died */
525 if (bytes
== -1 && errno
== EIO
&& !subshell_alive
)
530 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
531 fprintf (stderr
, "read (subshell_pty...): %s\r\n", unix_error_string (errno
));
536 write_all (STDOUT_FILENO
, pty_buffer
, bytes
);
539 else if (FD_ISSET (subshell_pipe
[READ
], &read_set
))
540 /* Read the subshell's CWD and capture its prompt */
542 bytes
= read (subshell_pipe
[READ
], subshell_cwd
, MC_MAXPATHLEN
+ 1);
545 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
546 fprintf (stderr
, "read (subshell_pipe[READ]...): %s\r\n",
547 unix_error_string (errno
));
551 subshell_cwd
[bytes
- 1] = 0; /* Squash the final '\n' */
555 subshell_ready
= TRUE
;
556 if (subshell_state
== RUNNING_COMMAND
)
558 subshell_state
= INACTIVE
;
563 else if (FD_ISSET (STDIN_FILENO
, &read_set
))
564 /* Read from stdin, write to the subshell */
566 bytes
= read (STDIN_FILENO
, pty_buffer
, sizeof (pty_buffer
));
569 tcsetattr (STDOUT_FILENO
, TCSANOW
, &shell_mode
);
571 "read (STDIN_FILENO, pty_buffer...): %s\r\n", unix_error_string (errno
));
575 for (i
= 0; i
< bytes
; ++i
)
576 if (pty_buffer
[i
] == subshell_switch_key
)
578 write_all (mc_global
.tty
.subshell_pty
, pty_buffer
, i
);
580 subshell_state
= INACTIVE
;
584 write_all (mc_global
.tty
.subshell_pty
, pty_buffer
, bytes
);
586 if (pty_buffer
[bytes
- 1] == '\n' || pty_buffer
[bytes
- 1] == '\r')
587 subshell_ready
= FALSE
;
594 /* --------------------------------------------------------------------------------------------- */
595 /* pty opening functions */
599 /* System V version of pty_open_master */
602 pty_open_master (char *pty_name
)
607 #ifdef HAVE_POSIX_OPENPT
608 pty_master
= posix_openpt (O_RDWR
);
610 /* getpt () is a GNU extension (glibc 2.1.x) */
611 pty_master
= getpt ();
613 strcpy (pty_name
, "/dev/ptc");
614 pty_master
= open (pty_name
, O_RDWR
);
616 strcpy (pty_name
, "/dev/ptmx");
617 pty_master
= open (pty_name
, O_RDWR
);
620 if (pty_master
== -1)
623 if (grantpt (pty_master
) == -1 /* Grant access to slave */
624 || unlockpt (pty_master
) == -1 /* Clear slave's lock flag */
625 || !(slave_name
= ptsname (pty_master
))) /* Get slave's name */
630 strcpy (pty_name
, slave_name
);
634 /* --------------------------------------------------------------------------------------------- */
635 /** System V version of pty_open_slave */
638 pty_open_slave (const char *pty_name
)
640 int pty_slave
= open (pty_name
, O_RDWR
);
644 fprintf (stderr
, "open (%s, O_RDWR): %s\r\n", pty_name
, unix_error_string (errno
));
647 #if !defined(__osf__) && !defined(__linux__)
648 #if defined (I_FIND) && defined (I_PUSH)
649 if (!ioctl (pty_slave
, I_FIND
, "ptem"))
650 if (ioctl (pty_slave
, I_PUSH
, "ptem") == -1)
652 fprintf (stderr
, "ioctl (%d, I_PUSH, \"ptem\") failed: %s\r\n",
653 pty_slave
, unix_error_string (errno
));
658 if (!ioctl (pty_slave
, I_FIND
, "ldterm"))
659 if (ioctl (pty_slave
, I_PUSH
, "ldterm") == -1)
662 "ioctl (%d, I_PUSH, \"ldterm\") failed: %s\r\n",
663 pty_slave
, unix_error_string (errno
));
667 #if !defined(sgi) && !defined(__sgi)
668 if (!ioctl (pty_slave
, I_FIND
, "ttcompat"))
669 if (ioctl (pty_slave
, I_PUSH
, "ttcompat") == -1)
672 "ioctl (%d, I_PUSH, \"ttcompat\") failed: %s\r\n",
673 pty_slave
, unix_error_string (errno
));
677 #endif /* sgi || __sgi */
678 #endif /* I_FIND && I_PUSH */
679 #endif /* __osf__ || __linux__ */
681 fcntl (pty_slave
, F_SETFD
, FD_CLOEXEC
);
685 #else /* !HAVE_GRANTPT */
687 /* --------------------------------------------------------------------------------------------- */
688 /** BSD version of pty_open_master */
690 pty_open_master (char *pty_name
)
693 const char *ptr1
, *ptr2
;
695 strcpy (pty_name
, "/dev/ptyXX");
696 for (ptr1
= "pqrstuvwxyzPQRST"; *ptr1
; ++ptr1
)
699 for (ptr2
= "0123456789abcdef"; *ptr2
!= '\0'; ++ptr2
)
703 /* Try to open master */
704 pty_master
= open (pty_name
, O_RDWR
);
705 if (pty_master
== -1)
707 if (errno
== ENOENT
) /* Different from EIO */
708 return -1; /* Out of pty devices */
709 continue; /* Try next pty device */
711 pty_name
[5] = 't'; /* Change "pty" to "tty" */
712 if (access (pty_name
, 6) != 0)
721 return -1; /* Ran out of pty devices */
724 /* --------------------------------------------------------------------------------------------- */
725 /** BSD version of pty_open_slave */
728 pty_open_slave (const char *pty_name
)
731 struct group
*group_info
= getgrnam ("tty");
733 if (group_info
!= NULL
)
735 /* The following two calls will only succeed if we are root */
736 /* [Commented out while permissions problem is investigated] */
737 /* chown (pty_name, getuid (), group_info->gr_gid); FIXME */
738 /* chmod (pty_name, S_IRUSR | S_IWUSR | S_IWGRP); FIXME */
740 pty_slave
= open (pty_name
, O_RDWR
);
742 fprintf (stderr
, "open (pty_name, O_RDWR): %s\r\n", pty_name
);
743 fcntl (pty_slave
, F_SETFD
, FD_CLOEXEC
);
746 #endif /* !HAVE_GRANTPT */
748 /* --------------------------------------------------------------------------------------------- */
749 /*** public functions ****************************************************************************/
750 /* --------------------------------------------------------------------------------------------- */
752 /* --------------------------------------------------------------------------------------------- */
754 * Fork the subshell, and set up many, many things.
756 * Possibly modifies the global variables:
757 * subshell_type, subshell_alive, subshell_stopped, subshell_pid
758 * mc_global.tty.use_subshell - Is set to FALSE if we can't run the subshell
759 * quit - Can be set to SUBSHELL_EXIT by the SIGCHLD handler
765 /* This must be remembered across calls to init_subshell() */
766 static char pty_name
[BUF_SMALL
];
767 char precmd
[BUF_SMALL
];
769 switch (check_sid ())
772 mc_global
.tty
.use_subshell
= FALSE
;
775 mc_global
.tty
.use_subshell
= FALSE
;
776 mc_global
.midnight_shutdown
= TRUE
;
780 /* Take the current (hopefully pristine) tty mode and make */
781 /* a raw mode based on it now, before we do anything else with it */
784 if (mc_global
.tty
.subshell_pty
== 0)
785 { /* First time through */
786 /* Find out what type of shell we have */
788 if (strstr (shell
, "/zsh") || getenv ("ZSH_VERSION"))
790 else if (strstr (shell
, "/tcsh"))
791 subshell_type
= TCSH
;
792 else if (strstr (shell
, "/csh"))
793 subshell_type
= TCSH
;
794 else if (strstr (shell
, "/bash") || getenv ("BASH"))
795 subshell_type
= BASH
;
796 else if (strstr (shell
, "/fish"))
797 subshell_type
= FISH
;
800 mc_global
.tty
.use_subshell
= FALSE
;
804 /* Open a pty for talking to the subshell */
806 /* FIXME: We may need to open a fresh pty each time on SVR4 */
808 mc_global
.tty
.subshell_pty
= pty_open_master (pty_name
);
809 if (mc_global
.tty
.subshell_pty
== -1)
811 fprintf (stderr
, "Cannot open master side of pty: %s\r\n", unix_error_string (errno
));
812 mc_global
.tty
.use_subshell
= FALSE
;
815 subshell_pty_slave
= pty_open_slave (pty_name
);
816 if (subshell_pty_slave
== -1)
818 fprintf (stderr
, "Cannot open slave side of pty %s: %s\r\n",
819 pty_name
, unix_error_string (errno
));
820 mc_global
.tty
.use_subshell
= FALSE
;
824 /* Create a pipe for receiving the subshell's CWD */
826 if (subshell_type
== TCSH
)
828 g_snprintf (tcsh_fifo
, sizeof (tcsh_fifo
), "%s/mc.pipe.%d",
829 mc_tmpdir (), (int) getpid ());
830 if (mkfifo (tcsh_fifo
, 0600) == -1)
832 fprintf (stderr
, "mkfifo(%s) failed: %s\r\n", tcsh_fifo
, unix_error_string (errno
));
833 mc_global
.tty
.use_subshell
= FALSE
;
837 /* Opening the FIFO as O_RDONLY or O_WRONLY causes deadlock */
839 if ((subshell_pipe
[READ
] = open (tcsh_fifo
, O_RDWR
)) == -1
840 || (subshell_pipe
[WRITE
] = open (tcsh_fifo
, O_RDWR
)) == -1)
842 fprintf (stderr
, _("Cannot open named pipe %s\n"), tcsh_fifo
);
843 perror (__FILE__
": open");
844 mc_global
.tty
.use_subshell
= FALSE
;
848 else /* subshell_type is BASH or ZSH */ if (pipe (subshell_pipe
))
850 perror (__FILE__
": couldn't create pipe");
851 mc_global
.tty
.use_subshell
= FALSE
;
856 /* Fork the subshell */
858 subshell_alive
= TRUE
;
859 subshell_stopped
= FALSE
;
860 subshell_pid
= fork ();
862 if (subshell_pid
== -1)
864 fprintf (stderr
, "Cannot spawn the subshell process: %s\r\n", unix_error_string (errno
));
865 /* We exit here because, if the process table is full, the */
866 /* other method of running user commands won't work either */
870 if (subshell_pid
== 0)
872 /* We are in the child process */
873 init_subshell_child (pty_name
);
876 /* Set up `precmd' or equivalent for reading the subshell's CWD */
878 switch (subshell_type
)
881 g_snprintf (precmd
, sizeof (precmd
),
882 " PROMPT_COMMAND='pwd>&%d;kill -STOP $$'\n", subshell_pipe
[WRITE
]);
886 g_snprintf (precmd
, sizeof (precmd
),
887 " precmd(){ pwd>&%d;kill -STOP $$ }\n", subshell_pipe
[WRITE
]);
891 g_snprintf (precmd
, sizeof (precmd
),
892 "set echo_style=both;"
893 "alias precmd 'echo $cwd:q >>%s;kill -STOP $$'\n", tcsh_fifo
);
896 g_snprintf (precmd
, sizeof (precmd
),
897 "function fish_prompt ; pwd>&%d;kill -STOP %%self; end\n",
898 subshell_pipe
[WRITE
]);
902 write_all (mc_global
.tty
.subshell_pty
, precmd
, strlen (precmd
));
904 /* Wait until the subshell has started up and processed the command */
906 subshell_state
= RUNNING_COMMAND
;
907 tty_enable_interrupt_key ();
908 if (!feed_subshell (QUIETLY
, TRUE
))
910 mc_global
.tty
.use_subshell
= FALSE
;
912 tty_disable_interrupt_key ();
914 mc_global
.tty
.use_subshell
= FALSE
; /* Subshell died instantly, so don't use it */
917 /* --------------------------------------------------------------------------------------------- */
920 invoke_subshell (const char *command
, int how
, vfs_path_t
** new_dir_vpath
)
924 /* Make the MC terminal transparent */
925 tcsetattr (STDOUT_FILENO
, TCSANOW
, &raw_mode
);
927 /* Make the subshell change to MC's working directory */
928 if (new_dir_vpath
!= NULL
)
929 do_subshell_chdir (current_panel
->cwd_vpath
, TRUE
, TRUE
);
931 if (command
== NULL
) /* The user has done "C-o" from MC */
933 if (subshell_state
== INACTIVE
)
935 subshell_state
= ACTIVE
;
936 /* FIXME: possibly take out this hack; the user can
937 re-play it by hitting C-hyphen a few times! */
939 write_all (mc_global
.tty
.subshell_pty
, " \b", 2); /* Hack to make prompt reappear */
942 else /* MC has passed us a user command */
945 write_all (mc_global
.tty
.subshell_pty
, " ", 1);
946 /* FIXME: if command is long (>8KB ?) we go comma */
947 write_all (mc_global
.tty
.subshell_pty
, command
, strlen (command
));
948 write_all (mc_global
.tty
.subshell_pty
, "\n", 1);
949 subshell_state
= RUNNING_COMMAND
;
950 subshell_ready
= FALSE
;
953 feed_subshell (how
, FALSE
);
958 cwd_str
= vfs_path_to_str (current_panel
->cwd_vpath
);
959 pcwd
= vfs_translate_path_n (cwd_str
);
963 if (new_dir_vpath
!= NULL
&& subshell_alive
&& strcmp (subshell_cwd
, pcwd
))
964 *new_dir_vpath
= vfs_path_from_str (subshell_cwd
); /* Make MC change to the subshell's CWD */
967 /* Restart the subshell if it has died by SIGHUP, SIGQUIT, etc. */
968 while (!subshell_alive
&& quit
== 0 && mc_global
.tty
.use_subshell
)
977 /* --------------------------------------------------------------------------------------------- */
980 read_subshell_prompt (void)
982 static int prompt_size
= INITIAL_PROMPT_SIZE
;
983 int bytes
= 0, i
, rc
= 0;
984 struct timeval timeleft
= { 0, 0 };
988 FD_SET (mc_global
.tty
.subshell_pty
, &tmp
);
990 if (subshell_prompt
== NULL
)
991 { /* First time through */
992 subshell_prompt
= g_malloc (prompt_size
);
993 *subshell_prompt
= '\0';
997 while (subshell_alive
998 && (rc
= select (mc_global
.tty
.subshell_pty
+ 1, &tmp
, NULL
, NULL
, &timeleft
)))
1000 /* Check for `select' errors */
1007 fprintf (stderr
, "select (FD_SETSIZE, &tmp...): %s\r\n", unix_error_string (errno
));
1008 exit (EXIT_FAILURE
);
1012 bytes
= read (mc_global
.tty
.subshell_pty
, pty_buffer
, sizeof (pty_buffer
));
1014 /* Extract the prompt from the shell output */
1016 for (i
= 0; i
< bytes
; ++i
)
1017 if (pty_buffer
[i
] == '\n' || pty_buffer
[i
] == '\r')
1026 subshell_prompt
[prompt_pos
++] = pty_buffer
[i
];
1027 if (prompt_pos
== prompt_size
)
1028 subshell_prompt
= g_realloc (subshell_prompt
, prompt_size
*= 2);
1031 subshell_prompt
[prompt_pos
] = '\0';
1033 if (rc
== 0 && bytes
== 0)
1038 /* --------------------------------------------------------------------------------------------- */
1041 do_update_prompt (void)
1043 if (update_subshell_prompt
)
1045 printf ("\r\n%s", subshell_prompt
);
1047 update_subshell_prompt
= FALSE
;
1051 /* --------------------------------------------------------------------------------------------- */
1054 exit_subshell (void)
1056 gboolean subshell_quit
= TRUE
;
1058 if (subshell_state
!= INACTIVE
&& subshell_alive
)
1060 query_dialog (_("Warning"),
1061 _("The shell is still active. Quit anyway?"),
1062 D_NORMAL
, 2, _("&Yes"), _("&No")) == 0;
1066 if (subshell_type
== TCSH
)
1068 if (unlink (tcsh_fifo
) == -1)
1069 fprintf (stderr
, "Cannot remove named pipe %s: %s\r\n",
1070 tcsh_fifo
, unix_error_string (errno
));
1073 g_free (subshell_prompt
);
1074 subshell_prompt
= NULL
;
1075 pty_buffer
[0] = '\0';
1078 return subshell_quit
;
1081 /* --------------------------------------------------------------------------------------------- */
1083 * Carefully quote directory name to allow entering any directory safely,
1084 * no matter what weird characters it may contain in its name.
1085 * NOTE: Treat directory name an untrusted data, don't allow it to cause
1086 * executing any commands in the shell. Escape all control characters.
1087 * Use following technique:
1089 * printf(1) with format string containing a single conversion specifier,
1090 * "b", and an argument which contains a copy of the string passed to
1091 * subshell_name_quote() with all characters, except digits and letters,
1092 * replaced by the backslash-escape sequence \0nnn, where "nnn" is the
1093 * numeric value of the character converted to octal number.
1095 * cd "`printf "%b" 'ABC\0nnnDEF\0nnnXYZ'`"
1100 subshell_name_quote (const char *s
)
1104 const char *quote_cmd_start
, *quote_cmd_end
;
1107 if (subshell_type
== FISH
)
1109 quote_cmd_start
= "(printf \"%b\" '";
1110 quote_cmd_end
= "')";
1114 quote_cmd_start
= "\"`printf \"%b\" '";
1115 quote_cmd_end
= "'`\"";
1118 /* Factor 5 because we need \, 0 and 3 other digits per character. */
1119 d
= ret
= g_try_malloc (1 + (5 * strlen (s
)) + (strlen (quote_cmd_start
))
1120 + (strlen (quote_cmd_end
)));
1124 /* Prevent interpreting leading `-' as a switch for `cd' */
1131 /* Copy the beginning of the command to the buffer */
1132 strcpy (d
, quote_cmd_start
);
1133 d
+= strlen (quote_cmd_start
);
1136 * Print every character except digits and letters as a backslash-escape
1137 * sequence of the form \0nnn, where "nnn" is the numeric value of the
1138 * character converted to octal number.
1141 for (; su
[0] != '\0';)
1143 n
= str_cget_next_char_safe (su
);
1144 if (str_isalnum (su
))
1146 memcpy (d
, su
, n
- su
);
1151 for (c
= 0; c
< n
- su
; c
++)
1153 sprintf (d
, "\\0%03o", (unsigned char) su
[c
]);
1160 strcpy (d
, quote_cmd_end
);
1166 /* --------------------------------------------------------------------------------------------- */
1168 /** If it actually changed the directory it returns true */
1170 do_subshell_chdir (const vfs_path_t
* vpath
, gboolean update_prompt
, gboolean reset_prompt
)
1176 pcwd
= vfs_path_to_str_flags (current_panel
->cwd_vpath
, 0, VPF_RECODE
);
1178 if (!(subshell_state
== INACTIVE
&& strcmp (subshell_cwd
, pcwd
) != 0))
1180 /* We have to repaint the subshell prompt if we read it from
1181 * the main program. Please note that in the code after this
1182 * if, the cd command that is sent will make the subshell
1183 * repaint the prompt, so we don't have to paint it. */
1185 do_update_prompt ();
1190 /* The initial space keeps this out of the command history (in bash
1191 because we set "HISTCONTROL=ignorespace") */
1192 write_all (mc_global
.tty
.subshell_pty
, " cd ", 4);
1194 directory
= vfs_path_to_str (vpath
);
1195 if (directory
!= '\0')
1199 translate
= vfs_translate_path_n (directory
);
1200 if (translate
!= NULL
)
1202 temp
= subshell_name_quote (translate
);
1205 write_all (mc_global
.tty
.subshell_pty
, temp
, strlen (temp
));
1210 /* Should not happen unless the directory name is so long
1211 that we don't have memory to quote it. */
1212 write_all (mc_global
.tty
.subshell_pty
, ".", 1);
1218 write_all (mc_global
.tty
.subshell_pty
, ".", 1);
1223 write_all (mc_global
.tty
.subshell_pty
, "/", 1);
1226 write_all (mc_global
.tty
.subshell_pty
, "\n", 1);
1228 subshell_state
= RUNNING_COMMAND
;
1229 feed_subshell (QUIETLY
, FALSE
);
1233 int bPathNotEq
= strcmp (subshell_cwd
, pcwd
);
1235 if (bPathNotEq
&& subshell_type
== TCSH
)
1237 char rp_subshell_cwd
[PATH_MAX
];
1238 char rp_current_panel_cwd
[PATH_MAX
];
1240 char *p_subshell_cwd
= mc_realpath (subshell_cwd
, rp_subshell_cwd
);
1241 char *p_current_panel_cwd
= mc_realpath (pcwd
, rp_current_panel_cwd
);
1243 if (p_subshell_cwd
== NULL
)
1244 p_subshell_cwd
= subshell_cwd
;
1245 if (p_current_panel_cwd
== NULL
)
1246 p_current_panel_cwd
= pcwd
;
1247 bPathNotEq
= strcmp (p_subshell_cwd
, p_current_panel_cwd
);
1250 if (bPathNotEq
&& strcmp (pcwd
, ".") != 0)
1254 cwd
= vfs_path_to_str_flags (current_panel
->cwd_vpath
, 0, VPF_STRIP_PASSWORD
);
1255 vfs_print_message (_("Warning: Cannot change to %s.\n"), cwd
);
1262 update_subshell_prompt
= FALSE
;
1265 /* Make sure that MC never stores the CWD in a silly format */
1266 /* like /usr////lib/../bin, or the strcmp() above will fail */
1269 /* --------------------------------------------------------------------------------------------- */
1272 subshell_get_console_attributes (void)
1274 /* Get our current terminal modes */
1276 if (tcgetattr (STDOUT_FILENO
, &shell_mode
))
1278 fprintf (stderr
, "Cannot get terminal settings: %s\r\n", unix_error_string (errno
));
1279 mc_global
.tty
.use_subshell
= FALSE
;
1283 /* --------------------------------------------------------------------------------------------- */
1285 * Figure out whether the subshell has stopped, exited or been killed
1286 * Possibly modifies: `subshell_alive', `subshell_stopped' and `quit' */
1289 sigchld_handler (int sig
)
1296 pid
= waitpid (subshell_pid
, &status
, WUNTRACED
| WNOHANG
);
1298 if (pid
== subshell_pid
)
1300 /* Figure out what has happened to the subshell */
1302 if (WIFSTOPPED (status
))
1304 if (WSTOPSIG (status
) == SIGSTOP
)
1306 /* The subshell has received a SIGSTOP signal */
1307 subshell_stopped
= TRUE
;
1311 /* The user has suspended the subshell. Revive it */
1312 kill (subshell_pid
, SIGCONT
);
1317 /* The subshell has either exited normally or been killed */
1318 subshell_alive
= FALSE
;
1319 delete_select_channel (mc_global
.tty
.subshell_pty
);
1320 if (WIFEXITED (status
) && WEXITSTATUS (status
) != FORK_FAILURE
)
1321 quit
|= SUBSHELL_EXIT
; /* Exited normally */
1325 pid
= waitpid (cons_saver_pid
, &status
, WUNTRACED
| WNOHANG
);
1327 if (pid
== cons_saver_pid
)
1330 if (WIFSTOPPED (status
))
1331 /* Someone has stopped cons.saver - restart it */
1332 kill (pid
, SIGCONT
);
1335 /* cons.saver has died - disable confole saving */
1336 handle_console (CONSOLE_DONE
);
1337 mc_global
.tty
.console_flag
= '\0';
1341 #endif /* __linux__ */
1343 /* If we got here, some other child exited; ignore it */
1346 /* --------------------------------------------------------------------------------------------- */