f91dc7160ead071a18014f7d7ebc6ddee007f875
2 * Pseudo-tty backend for pterm.
5 #define _XOPEN_SOURCE 600
6 #define _XOPEN_SOURCE_EXTENDED
20 #include <sys/types.h>
23 #include <sys/ioctl.h>
37 #define UTMP_FILE "/var/run/utmp"
40 #define WTMP_FILE "/var/log/wtmp"
44 #define LASTLOG_FILE _PATH_LASTLOG
46 #define LASTLOG_FILE "/var/log/lastlog"
51 * Set up a default for vaguely sane systems. The idea is that if
52 * OMIT_UTMP is not defined, then at least one of the symbols which
53 * enable particular forms of utmp processing should be, if only so
54 * that a link error can warn you that you should have defined
55 * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is
56 * the only such symbol.
59 #if !defined HAVE_PUTUTLINE
60 #define HAVE_PUTUTLINE
64 typedef struct pty_tag
*Pty
;
67 * The pty_signal_pipe, along with the SIGCHLD handler, must be
68 * process-global rather than session-specific.
70 static int pty_signal_pipe
[2] = { -1, -1 }; /* obviously bogus initial val */
74 int master_fd
, slave_fd
;
76 char name
[FILENAME_MAX
];
78 int term_width
, term_height
;
79 int child_dead
, finished
;
84 * We store our pty backends in a tree sorted by master fd, so that
85 * when we get an uxsel notification we know which backend instance
86 * is the owner of the pty that caused it.
88 static int pty_compare_by_fd(void *av
, void *bv
)
93 if (a
->master_fd
< b
->master_fd
)
95 else if (a
->master_fd
> b
->master_fd
)
100 static int pty_find_by_fd(void *av
, void *bv
)
105 if (a
< b
->master_fd
)
107 else if (a
> b
->master_fd
)
112 static tree234
*ptys_by_fd
= NULL
;
115 * We also have a tree sorted by child pid, so that when we wait()
116 * in response to the signal we know which backend instance is the
117 * owner of the process that caused the signal.
119 static int pty_compare_by_pid(void *av
, void *bv
)
124 if (a
->child_pid
< b
->child_pid
)
126 else if (a
->child_pid
> b
->child_pid
)
131 static int pty_find_by_pid(void *av
, void *bv
)
136 if (a
< b
->child_pid
)
138 else if (a
> b
->child_pid
)
143 static tree234
*ptys_by_pid
= NULL
;
146 * If we are using pty_pre_init(), it will need to have already
147 * allocated a pty structure, which we must then return from
148 * pty_init() rather than allocating a new one. Here we store that
149 * structure between allocation and use.
151 * Note that although most of this module is entirely capable of
152 * handling multiple ptys in a single process, pty_pre_init() is
153 * fundamentally _dependent_ on there being at most one pty per
154 * process, so the normal static-data constraints don't apply.
156 * Likewise, since utmp is only used via pty_pre_init, it too must
157 * be single-instance, so we can declare utmp-related variables
160 static Pty single_pty
= NULL
;
163 static int pty_utmp_helper_pid
, pty_utmp_helper_pipe
;
164 static int pty_stamped_utmp
;
165 static struct utmp utmp_entry
;
169 * pty_argv is a grievous hack to allow a proper argv to be passed
170 * through from the Unix command line. Again, it doesn't really
171 * make sense outside a one-pty-per-process setup.
175 static void pty_close(Pty pty
);
178 static void setup_utmp(char *ttyname
, char *location
)
181 struct lastlog lastlog_entry
;
188 pw
= getpwuid(getuid());
189 memset(&utmp_entry
, 0, sizeof(utmp_entry
));
190 utmp_entry
.ut_type
= USER_PROCESS
;
191 utmp_entry
.ut_pid
= getpid();
192 strncpy(utmp_entry
.ut_line
, ttyname
+5, lenof(utmp_entry
.ut_line
));
193 strncpy(utmp_entry
.ut_id
, ttyname
+8, lenof(utmp_entry
.ut_id
));
194 strncpy(utmp_entry
.ut_user
, pw
->pw_name
, lenof(utmp_entry
.ut_user
));
195 strncpy(utmp_entry
.ut_host
, location
, lenof(utmp_entry
.ut_host
));
196 /* Apparently there are some architectures where (struct utmp).ut_time
197 * is not essentially time_t (e.g. Linux amd64). Hence the temporary. */
199 utmp_entry
.ut_time
= uttime
; /* may truncate */
201 #if defined HAVE_PUTUTLINE
204 pututline(&utmp_entry
);
208 if ((wtmp
= fopen(WTMP_FILE
, "a")) != NULL
) {
209 fwrite(&utmp_entry
, 1, sizeof(utmp_entry
), wtmp
);
214 memset(&lastlog_entry
, 0, sizeof(lastlog_entry
));
215 strncpy(lastlog_entry
.ll_line
, ttyname
+5, lenof(lastlog_entry
.ll_line
));
216 strncpy(lastlog_entry
.ll_host
, location
, lenof(lastlog_entry
.ll_host
));
217 time(&lastlog_entry
.ll_time
);
218 if ((lastlog
= fopen(LASTLOG_FILE
, "r+")) != NULL
) {
219 fseek(lastlog
, sizeof(lastlog_entry
) * getuid(), SEEK_SET
);
220 fwrite(&lastlog_entry
, 1, sizeof(lastlog_entry
), lastlog
);
225 pty_stamped_utmp
= 1;
229 static void cleanup_utmp(void)
234 if (!pty_stamped_utmp
)
237 utmp_entry
.ut_type
= DEAD_PROCESS
;
238 memset(utmp_entry
.ut_user
, 0, lenof(utmp_entry
.ut_user
));
240 utmp_entry
.ut_time
= uttime
;
242 if ((wtmp
= fopen(WTMP_FILE
, "a")) != NULL
) {
243 fwrite(&utmp_entry
, 1, sizeof(utmp_entry
), wtmp
);
247 memset(utmp_entry
.ut_line
, 0, lenof(utmp_entry
.ut_line
));
248 utmp_entry
.ut_time
= 0;
250 #if defined HAVE_PUTUTLINE
253 pututline(&utmp_entry
);
257 pty_stamped_utmp
= 0; /* ensure we never double-cleanup */
261 static void sigchld_handler(int signum
)
263 write(pty_signal_pipe
[1], "x", 1);
267 static void fatal_sig_handler(int signum
)
269 putty_signal(signum
, SIG_DFL
);
276 static int pty_open_slave(Pty pty
)
278 if (pty
->slave_fd
< 0)
279 pty
->slave_fd
= open(pty
->name
, O_RDWR
);
281 return pty
->slave_fd
;
284 static void pty_open_master(Pty pty
)
287 const char chars1
[] = "pqrstuvwxyz";
288 const char chars2
[] = "0123456789abcdef";
290 char master_name
[20];
293 for (p1
= chars1
; *p1
; p1
++)
294 for (p2
= chars2
; *p2
; p2
++) {
295 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
296 pty
->master_fd
= open(master_name
, O_RDWR
);
297 if (pty
->master_fd
>= 0) {
298 if (geteuid() == 0 ||
299 access(master_name
, R_OK
| W_OK
) == 0) {
301 * We must also check at this point that we are
302 * able to open the slave side of the pty. We
303 * wouldn't want to allocate the wrong master,
304 * get all the way down to forking, and _then_
305 * find we're unable to open the slave.
307 strcpy(pty
->name
, master_name
);
308 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
310 if (pty_open_slave(pty
) >= 0 &&
311 access(pty
->name
, R_OK
| W_OK
) == 0)
313 if (pty
->slave_fd
> 0)
314 close(pty
->slave_fd
);
317 close(pty
->master_fd
);
321 /* If we get here, we couldn't get a tty at all. */
322 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
327 /* We need to chown/chmod the /dev/ttyXX device. */
328 gp
= getgrnam("tty");
329 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
330 chmod(pty
->name
, 0600);
332 pty
->master_fd
= open("/dev/ptmx", O_RDWR
);
334 if (pty
->master_fd
< 0) {
335 perror("/dev/ptmx: open");
339 if (grantpt(pty
->master_fd
) < 0) {
344 if (unlockpt(pty
->master_fd
) < 0) {
349 pty
->name
[FILENAME_MAX
-1] = '\0';
350 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
354 ptys_by_fd
= newtree234(pty_compare_by_fd
);
355 add234(ptys_by_fd
, pty
);
359 * Pre-initialisation. This is here to get around the fact that GTK
360 * doesn't like being run in setuid/setgid programs (probably
361 * sensibly). So before we initialise GTK - and therefore before we
362 * even process the command line - we check to see if we're running
363 * set[ug]id. If so, we open our pty master _now_, chown it as
364 * necessary, and drop privileges. We can always close it again
365 * later. If we're potentially going to be doing utmp as well, we
366 * also fork off a utmp helper process and communicate with it by
367 * means of a pipe; the utmp helper will keep privileges in order
368 * to clean up utmp when we exit (i.e. when its end of our pipe
371 void pty_pre_init(void)
380 pty
= single_pty
= snew(struct pty_tag
);
382 /* set the child signal handler straight away; it needs to be set
383 * before we ever fork. */
384 putty_signal(SIGCHLD
, sigchld_handler
);
385 pty
->master_fd
= pty
->slave_fd
= -1;
387 pty_stamped_utmp
= FALSE
;
390 if (geteuid() != getuid() || getegid() != getgid()) {
391 pty_open_master(pty
);
396 * Fork off the utmp helper.
398 if (pipe(pipefd
) < 0) {
399 perror("pterm: pipe");
404 perror("pterm: fork");
406 } else if (pid
== 0) {
407 char display
[128], buffer
[128];
412 * Now sit here until we receive a display name from the
413 * other end of the pipe, and then stamp utmp. Unstamp utmp
414 * again, and exit, when the pipe closes.
420 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
424 } else if (!pty_stamped_utmp
) {
425 if (dlen
< lenof(display
))
426 memcpy(display
+dlen
, buffer
,
427 min(ret
, lenof(display
)-dlen
));
428 if (buffer
[ret
-1] == '\0') {
430 * Now we have a display name. NUL-terminate
431 * it, and stamp utmp.
433 display
[lenof(display
)-1] = '\0';
435 * Trap as many fatal signals as we can in the
436 * hope of having the best possible chance to
437 * clean up utmp before termination. We are
438 * unfortunately unprotected against SIGKILL,
441 putty_signal(SIGHUP
, fatal_sig_handler
);
442 putty_signal(SIGINT
, fatal_sig_handler
);
443 putty_signal(SIGQUIT
, fatal_sig_handler
);
444 putty_signal(SIGILL
, fatal_sig_handler
);
445 putty_signal(SIGABRT
, fatal_sig_handler
);
446 putty_signal(SIGFPE
, fatal_sig_handler
);
447 putty_signal(SIGPIPE
, fatal_sig_handler
);
448 putty_signal(SIGALRM
, fatal_sig_handler
);
449 putty_signal(SIGTERM
, fatal_sig_handler
);
450 putty_signal(SIGSEGV
, fatal_sig_handler
);
451 putty_signal(SIGUSR1
, fatal_sig_handler
);
452 putty_signal(SIGUSR2
, fatal_sig_handler
);
454 putty_signal(SIGBUS
, fatal_sig_handler
);
457 putty_signal(SIGPOLL
, fatal_sig_handler
);
460 putty_signal(SIGPROF
, fatal_sig_handler
);
463 putty_signal(SIGSYS
, fatal_sig_handler
);
466 putty_signal(SIGTRAP
, fatal_sig_handler
);
469 putty_signal(SIGVTALRM
, fatal_sig_handler
);
472 putty_signal(SIGXCPU
, fatal_sig_handler
);
475 putty_signal(SIGXFSZ
, fatal_sig_handler
);
478 putty_signal(SIGIO
, fatal_sig_handler
);
480 setup_utmp(pty
->name
, display
);
486 pty_utmp_helper_pid
= pid
;
487 pty_utmp_helper_pipe
= pipefd
[1];
493 #ifndef HAVE_NO_SETRESUID
494 int gid
= getgid(), uid
= getuid();
495 int setresgid(gid_t
, gid_t
, gid_t
);
496 int setresuid(uid_t
, uid_t
, uid_t
);
497 setresgid(gid
, gid
, gid
);
498 setresuid(uid
, uid
, uid
);
506 int pty_real_select_result(Pty pty
, int event
, int status
)
510 int finished
= FALSE
;
514 * We've been called because our child process did
515 * something. `status' tells us what.
517 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
519 * The primary child process died. We could keep
520 * the terminal open for remaining subprocesses to
521 * output to, but conventional wisdom seems to feel
522 * that that's the Wrong Thing for an xterm-alike,
523 * so we bail out now (though we don't necessarily
524 * _close_ the window, depending on the state of
525 * Close On Exit). This would be easy enough to
526 * change or make configurable if necessary.
528 pty
->exit_code
= status
;
529 pty
->child_dead
= TRUE
;
530 del234(ptys_by_pid
, pty
);
536 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
539 * Clean termination condition is that either ret == 0, or ret
540 * < 0 and errno == EIO. Not sure why the latter, but it seems
543 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
545 * We assume a clean exit if the pty has closed but the
546 * actual child process hasn't. The only way I can
547 * imagine this happening is if it detaches itself from
548 * the pty and goes daemonic - in which case the
549 * expected usage model would precisely _not_ be for
550 * the pterm window to hang around!
553 if (!pty
->child_dead
)
555 } else if (ret
< 0) {
556 perror("read pty master");
558 } else if (ret
> 0) {
559 from_backend(pty
->frontend
, 0, buf
, ret
);
564 if (finished
&& !pty
->finished
) {
565 uxsel_del(pty
->master_fd
);
569 pty
->finished
= TRUE
;
572 * This is a slight layering-violation sort of hack: only
573 * if we're not closing on exit (COE is set to Never, or to
574 * Only On Clean and it wasn't a clean exit) do we output a
575 * `terminated' message.
577 if (pty
->cfg
.close_on_exit
== FORCE_OFF
||
578 (pty
->cfg
.close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
580 if (WIFEXITED(pty
->exit_code
))
581 sprintf(message
, "\r\n[pterm: process terminated with exit"
582 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
583 else if (WIFSIGNALED(pty
->exit_code
))
584 #ifdef HAVE_NO_STRSIGNAL
585 sprintf(message
, "\r\n[pterm: process terminated on signal"
586 " %d]\r\n", WTERMSIG(pty
->exit_code
));
588 sprintf(message
, "\r\n[pterm: process terminated on signal"
589 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
590 strsignal(WTERMSIG(pty
->exit_code
)));
592 from_backend(pty
->frontend
, 0, message
, strlen(message
));
595 notify_remote_exit(pty
->frontend
);
601 int pty_select_result(int fd
, int event
)
606 if (fd
== pty_signal_pipe
[0]) {
612 read(pty_signal_pipe
[0], c
, 1); /* ignore its value; it'll be `x' */
615 pid
= waitpid(-1, &status
, WNOHANG
);
618 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
621 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
624 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
627 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
633 static void pty_uxsel_setup(Pty pty
)
635 uxsel_set(pty
->master_fd
, 1, pty_select_result
);
638 * In principle this only needs calling once for all pty
639 * backend instances, but it's simplest just to call it every
640 * time; uxsel won't mind.
642 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
646 * Called to set up the pty.
648 * Returns an error message, or NULL on success.
650 * Also places the canonical host name into `realhost'. It must be
651 * freed by the caller.
653 static const char *pty_init(void *frontend
, void **backend_handle
, Config
*cfg
,
654 char *host
, int port
, char **realhost
, int nodelay
,
659 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
667 pty
= snew(struct pty_tag
);
668 pty
->master_fd
= pty
->slave_fd
= -1;
670 pty_stamped_utmp
= FALSE
;
674 pty
->frontend
= frontend
;
675 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
677 pty
->cfg
= *cfg
; /* structure copy */
678 pty
->term_width
= cfg
->width
;
679 pty
->term_height
= cfg
->height
;
681 if (pty
->master_fd
< 0)
682 pty_open_master(pty
);
685 * Set the backspace character to be whichever of ^H and ^? is
686 * specified by bksp_is_delete.
689 struct termios attrs
;
690 tcgetattr(pty
->master_fd
, &attrs
);
691 attrs
.c_cc
[VERASE
] = cfg
->bksp_is_delete ?
'\177' : '\010';
692 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
697 * Stamp utmp (that is, tell the utmp helper process to do so),
700 if (!cfg
->stamp_utmp
) {
701 close(pty_utmp_helper_pipe
); /* just let the child process die */
702 pty_utmp_helper_pipe
= -1;
704 char *location
= get_x_display(pty
->frontend
);
705 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
707 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
709 perror("pterm: writing to utmp helper process");
710 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
711 pty_utmp_helper_pipe
= -1;
719 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
720 windowid
= get_windowid(pty
->frontend
);
724 * Fork and execute the command.
738 slavefd
= pty_open_slave(pty
);
740 perror("slave pty: open");
744 close(pty
->master_fd
);
745 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
750 ioctl(slavefd
, TIOCSCTTY
, 1);
752 tcsetpgrp(slavefd
, pgrp
);
754 close(open(pty
->name
, O_WRONLY
, 0));
756 /* Close everything _else_, for tidiness. */
757 for (i
= 3; i
< 1024; i
++)
760 char term_env_var
[10 + sizeof(cfg
->termtype
)];
761 sprintf(term_env_var
, "TERM=%s", cfg
->termtype
);
762 putenv(term_env_var
);
764 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
766 char windowid_env_var
[40];
767 sprintf(windowid_env_var
, "WINDOWID=%ld", windowid
);
768 putenv(windowid_env_var
);
772 char *e
= cfg
->environmt
;
773 char *var
, *varend
, *val
, *varval
;
776 while (*e
&& *e
!= '\t') e
++;
783 varval
= dupprintf("%.*s=%s", varend
-var
, var
, val
);
786 * We must not free varval, since putenv links it
787 * into the environment _in place_. Weird, but
788 * there we go. Memory usage will be rationalised
789 * as soon as we exec anyway.
795 * SIGINT and SIGQUIT may have been set to ignored by our
796 * parent, particularly by things like sh -c 'pterm &' and
797 * some window managers. SIGCHLD, meanwhile, was blocked
798 * during pt_main() startup. Reverse all this for our child
801 putty_signal(SIGINT
, SIG_DFL
);
802 putty_signal(SIGQUIT
, SIG_DFL
);
803 block_signal(SIGCHLD
, 0);
805 execvp(pty_argv
[0], pty_argv
);
807 char *shell
= getenv("SHELL");
809 if (cfg
->login_shell
) {
810 char *p
= strrchr(shell
, '/');
811 shellname
= snewn(2+strlen(shell
), char);
813 sprintf(shellname
, "-%s", p
);
816 execl(getenv("SHELL"), shellname
, NULL
);
820 * If we're here, exec has gone badly foom.
825 pty
->child_pid
= pid
;
826 pty
->child_dead
= FALSE
;
827 pty
->finished
= FALSE
;
828 if (pty
->slave_fd
> 0)
829 close(pty
->slave_fd
);
831 ptys_by_pid
= newtree234(pty_compare_by_pid
);
832 add234(ptys_by_pid
, pty
);
835 if (pty_signal_pipe
[0] < 0 && pipe(pty_signal_pipe
) < 0) {
839 pty_uxsel_setup(pty
);
841 *backend_handle
= pty
;
846 static void pty_reconfig(void *handle
, Config
*cfg
)
848 Pty pty
= (Pty
)handle
;
850 * We don't have much need to reconfigure this backend, but
851 * unfortunately we do need to pick up the setting of Close On
852 * Exit so we know whether to give a `terminated' message.
854 pty
->cfg
= *cfg
; /* structure copy */
858 * Stub routine (never called in pterm).
860 static void pty_free(void *handle
)
862 Pty pty
= (Pty
)handle
;
864 /* Either of these may fail `not found'. That's fine with us. */
865 del234(ptys_by_pid
, pty
);
866 del234(ptys_by_fd
, pty
);
872 * Called to send data down the pty.
874 static int pty_send(void *handle
, char *buf
, int len
)
876 Pty pty
= (Pty
)handle
;
878 if (pty
->master_fd
< 0)
879 return 0; /* ignore all writes if fd closed */
882 int ret
= write(pty
->master_fd
, buf
, len
);
884 perror("write pty master");
893 static void pty_close(Pty pty
)
895 if (pty
->master_fd
>= 0) {
896 close(pty
->master_fd
);
900 if (pty_utmp_helper_pipe
>= 0) {
901 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
902 pty_utmp_helper_pipe
= -1;
908 * Called to query the current socket sendability status.
910 static int pty_sendbuffer(void *handle
)
912 /* Pty pty = (Pty)handle; */
917 * Called to set the size of the window
919 static void pty_size(void *handle
, int width
, int height
)
921 Pty pty
= (Pty
)handle
;
924 pty
->term_width
= width
;
925 pty
->term_height
= height
;
927 size
.ws_row
= (unsigned short)pty
->term_height
;
928 size
.ws_col
= (unsigned short)pty
->term_width
;
929 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
930 font_dimension(pty
->frontend
, 0);
931 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
932 font_dimension(pty
->frontend
, 1);
933 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
938 * Send special codes.
940 static void pty_special(void *handle
, Telnet_Special code
)
942 /* Pty pty = (Pty)handle; */
948 * Return a list of the special codes that make sense in this
951 static const struct telnet_special
*pty_get_specials(void *handle
)
953 /* Pty pty = (Pty)handle; */
955 * Hmm. When I get round to having this actually usable, it
956 * might be quite nice to have the ability to deliver a few
957 * well chosen signals to the child process - SIGINT, SIGTERM,
963 static Socket
pty_socket(void *handle
)
965 /* Pty pty = (Pty)handle; */
966 return NULL
; /* shouldn't ever be needed */
969 static int pty_sendok(void *handle
)
971 /* Pty pty = (Pty)handle; */
975 static void pty_unthrottle(void *handle
, int backlog
)
977 /* Pty pty = (Pty)handle; */
981 static int pty_ldisc(void *handle
, int option
)
983 /* Pty pty = (Pty)handle; */
984 return 0; /* neither editing nor echoing */
987 static void pty_provide_ldisc(void *handle
, void *ldisc
)
989 /* Pty pty = (Pty)handle; */
990 /* This is a stub. */
993 static void pty_provide_logctx(void *handle
, void *logctx
)
995 /* Pty pty = (Pty)handle; */
996 /* This is a stub. */
999 static int pty_exitcode(void *handle
)
1001 Pty pty
= (Pty
)handle
;
1003 return -1; /* not dead yet */
1005 return pty
->exit_code
;
1008 static int pty_cfg_info(void *handle
)
1010 /* Pty pty = (Pty)handle; */
1014 Backend pty_backend
= {