2 * Pseudo-tty backend for pterm.
19 #include <sys/types.h>
22 #include <sys/ioctl.h>
39 /* updwtmpx() needs the name of the wtmp file. Try to find it. */
42 #define WTMPX_FILE _PATH_WTMPX
44 #define WTMPX_FILE "/var/log/wtmpx"
50 #define LASTLOG_FILE _PATH_LASTLOG
52 #define LASTLOG_FILE "/var/log/lastlog"
57 * Set up a default for vaguely sane systems. The idea is that if
58 * OMIT_UTMP is not defined, then at least one of the symbols which
59 * enable particular forms of utmp processing should be, if only so
60 * that a link error can warn you that you should have defined
61 * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is
62 * the only such symbol.
65 #if !defined HAVE_PUTUTLINE
66 #define HAVE_PUTUTLINE
70 typedef struct pty_tag
*Pty
;
73 * The pty_signal_pipe, along with the SIGCHLD handler, must be
74 * process-global rather than session-specific.
76 static int pty_signal_pipe
[2] = { -1, -1 }; /* obviously bogus initial val */
80 int master_fd
, slave_fd
;
82 char name
[FILENAME_MAX
];
84 int term_width
, term_height
;
85 int child_dead
, finished
;
91 * We store our pty backends in a tree sorted by master fd, so that
92 * when we get an uxsel notification we know which backend instance
93 * is the owner of the pty that caused it.
95 static int pty_compare_by_fd(void *av
, void *bv
)
100 if (a
->master_fd
< b
->master_fd
)
102 else if (a
->master_fd
> b
->master_fd
)
107 static int pty_find_by_fd(void *av
, void *bv
)
112 if (a
< b
->master_fd
)
114 else if (a
> b
->master_fd
)
119 static tree234
*ptys_by_fd
= NULL
;
122 * We also have a tree sorted by child pid, so that when we wait()
123 * in response to the signal we know which backend instance is the
124 * owner of the process that caused the signal.
126 static int pty_compare_by_pid(void *av
, void *bv
)
131 if (a
->child_pid
< b
->child_pid
)
133 else if (a
->child_pid
> b
->child_pid
)
138 static int pty_find_by_pid(void *av
, void *bv
)
143 if (a
< b
->child_pid
)
145 else if (a
> b
->child_pid
)
150 static tree234
*ptys_by_pid
= NULL
;
153 * If we are using pty_pre_init(), it will need to have already
154 * allocated a pty structure, which we must then return from
155 * pty_init() rather than allocating a new one. Here we store that
156 * structure between allocation and use.
158 * Note that although most of this module is entirely capable of
159 * handling multiple ptys in a single process, pty_pre_init() is
160 * fundamentally _dependent_ on there being at most one pty per
161 * process, so the normal static-data constraints don't apply.
163 * Likewise, since utmp is only used via pty_pre_init, it too must
164 * be single-instance, so we can declare utmp-related variables
167 static Pty single_pty
= NULL
;
170 static int pty_utmp_helper_pid
, pty_utmp_helper_pipe
;
171 static int pty_stamped_utmp
;
172 static struct utmpx utmp_entry
;
176 * pty_argv is a grievous hack to allow a proper argv to be passed
177 * through from the Unix command line. Again, it doesn't really
178 * make sense outside a one-pty-per-process setup.
182 static void pty_close(Pty pty
);
183 static void pty_try_write(Pty pty
);
186 static void setup_utmp(char *ttyname
, char *location
)
189 struct lastlog lastlog_entry
;
195 pw
= getpwuid(getuid());
196 memset(&utmp_entry
, 0, sizeof(utmp_entry
));
197 utmp_entry
.ut_type
= USER_PROCESS
;
198 utmp_entry
.ut_pid
= getpid();
199 strncpy(utmp_entry
.ut_line
, ttyname
+5, lenof(utmp_entry
.ut_line
));
200 strncpy(utmp_entry
.ut_id
, ttyname
+8, lenof(utmp_entry
.ut_id
));
201 strncpy(utmp_entry
.ut_user
, pw
->pw_name
, lenof(utmp_entry
.ut_user
));
202 strncpy(utmp_entry
.ut_host
, location
, lenof(utmp_entry
.ut_host
));
204 * Apparently there are some architectures where (struct
205 * utmpx).ut_tv is not essentially struct timeval (e.g. Linux
206 * amd64). Hence the temporary.
208 gettimeofday(&tv
, NULL
);
209 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
210 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
213 pututxline(&utmp_entry
);
216 updwtmpx(WTMPX_FILE
, &utmp_entry
);
219 memset(&lastlog_entry
, 0, sizeof(lastlog_entry
));
220 strncpy(lastlog_entry
.ll_line
, ttyname
+5, lenof(lastlog_entry
.ll_line
));
221 strncpy(lastlog_entry
.ll_host
, location
, lenof(lastlog_entry
.ll_host
));
222 time(&lastlog_entry
.ll_time
);
223 if ((lastlog
= fopen(LASTLOG_FILE
, "r+")) != NULL
) {
224 fseek(lastlog
, sizeof(lastlog_entry
) * getuid(), SEEK_SET
);
225 fwrite(&lastlog_entry
, 1, sizeof(lastlog_entry
), lastlog
);
230 pty_stamped_utmp
= 1;
234 static void cleanup_utmp(void)
238 if (!pty_stamped_utmp
)
241 utmp_entry
.ut_type
= DEAD_PROCESS
;
242 memset(utmp_entry
.ut_user
, 0, lenof(utmp_entry
.ut_user
));
243 gettimeofday(&tv
, NULL
);
244 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
245 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
247 updwtmpx(WTMPX_FILE
, &utmp_entry
);
249 memset(utmp_entry
.ut_line
, 0, lenof(utmp_entry
.ut_line
));
250 utmp_entry
.ut_tv
.tv_sec
= 0;
251 utmp_entry
.ut_tv
.tv_usec
= 0;
254 pututxline(&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
);
280 cloexec(pty
->slave_fd
);
283 return pty
->slave_fd
;
286 static void pty_open_master(Pty pty
)
289 const char chars1
[] = "pqrstuvwxyz";
290 const char chars2
[] = "0123456789abcdef";
292 char master_name
[20];
295 for (p1
= chars1
; *p1
; p1
++)
296 for (p2
= chars2
; *p2
; p2
++) {
297 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
298 pty
->master_fd
= open(master_name
, O_RDWR
);
299 if (pty
->master_fd
>= 0) {
300 if (geteuid() == 0 ||
301 access(master_name
, R_OK
| W_OK
) == 0) {
303 * We must also check at this point that we are
304 * able to open the slave side of the pty. We
305 * wouldn't want to allocate the wrong master,
306 * get all the way down to forking, and _then_
307 * find we're unable to open the slave.
309 strcpy(pty
->name
, master_name
);
310 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
312 cloexec(pty
->master_fd
);
314 if (pty_open_slave(pty
) >= 0 &&
315 access(pty
->name
, R_OK
| W_OK
) == 0)
317 if (pty
->slave_fd
> 0)
318 close(pty
->slave_fd
);
321 close(pty
->master_fd
);
325 /* If we get here, we couldn't get a tty at all. */
326 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
331 /* We need to chown/chmod the /dev/ttyXX device. */
332 gp
= getgrnam("tty");
333 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
334 chmod(pty
->name
, 0600);
336 pty
->master_fd
= open("/dev/ptmx", O_RDWR
);
338 if (pty
->master_fd
< 0) {
339 perror("/dev/ptmx: open");
343 if (grantpt(pty
->master_fd
) < 0) {
348 if (unlockpt(pty
->master_fd
) < 0) {
353 cloexec(pty
->master_fd
);
355 pty
->name
[FILENAME_MAX
-1] = '\0';
356 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
361 * Set the pty master into non-blocking mode.
364 ioctl(pty
->master_fd
, FIONBIO
, &i
);
368 ptys_by_fd
= newtree234(pty_compare_by_fd
);
369 add234(ptys_by_fd
, pty
);
373 * Pre-initialisation. This is here to get around the fact that GTK
374 * doesn't like being run in setuid/setgid programs (probably
375 * sensibly). So before we initialise GTK - and therefore before we
376 * even process the command line - we check to see if we're running
377 * set[ug]id. If so, we open our pty master _now_, chown it as
378 * necessary, and drop privileges. We can always close it again
379 * later. If we're potentially going to be doing utmp as well, we
380 * also fork off a utmp helper process and communicate with it by
381 * means of a pipe; the utmp helper will keep privileges in order
382 * to clean up utmp when we exit (i.e. when its end of our pipe
385 void pty_pre_init(void)
394 pty
= single_pty
= snew(struct pty_tag
);
395 bufchain_init(&pty
->output_data
);
397 /* set the child signal handler straight away; it needs to be set
398 * before we ever fork. */
399 putty_signal(SIGCHLD
, sigchld_handler
);
400 pty
->master_fd
= pty
->slave_fd
= -1;
402 pty_stamped_utmp
= FALSE
;
405 if (geteuid() != getuid() || getegid() != getgid()) {
406 pty_open_master(pty
);
411 * Fork off the utmp helper.
413 if (pipe(pipefd
) < 0) {
414 perror("pterm: pipe");
421 perror("pterm: fork");
423 } else if (pid
== 0) {
424 char display
[128], buffer
[128];
429 * Now sit here until we receive a display name from the
430 * other end of the pipe, and then stamp utmp. Unstamp utmp
431 * again, and exit, when the pipe closes.
437 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
441 } else if (!pty_stamped_utmp
) {
442 if (dlen
< lenof(display
))
443 memcpy(display
+dlen
, buffer
,
444 min(ret
, lenof(display
)-dlen
));
445 if (buffer
[ret
-1] == '\0') {
447 * Now we have a display name. NUL-terminate
448 * it, and stamp utmp.
450 display
[lenof(display
)-1] = '\0';
452 * Trap as many fatal signals as we can in the
453 * hope of having the best possible chance to
454 * clean up utmp before termination. We are
455 * unfortunately unprotected against SIGKILL,
458 putty_signal(SIGHUP
, fatal_sig_handler
);
459 putty_signal(SIGINT
, fatal_sig_handler
);
460 putty_signal(SIGQUIT
, fatal_sig_handler
);
461 putty_signal(SIGILL
, fatal_sig_handler
);
462 putty_signal(SIGABRT
, fatal_sig_handler
);
463 putty_signal(SIGFPE
, fatal_sig_handler
);
464 putty_signal(SIGPIPE
, fatal_sig_handler
);
465 putty_signal(SIGALRM
, fatal_sig_handler
);
466 putty_signal(SIGTERM
, fatal_sig_handler
);
467 putty_signal(SIGSEGV
, fatal_sig_handler
);
468 putty_signal(SIGUSR1
, fatal_sig_handler
);
469 putty_signal(SIGUSR2
, fatal_sig_handler
);
471 putty_signal(SIGBUS
, fatal_sig_handler
);
474 putty_signal(SIGPOLL
, fatal_sig_handler
);
477 putty_signal(SIGPROF
, fatal_sig_handler
);
480 putty_signal(SIGSYS
, fatal_sig_handler
);
483 putty_signal(SIGTRAP
, fatal_sig_handler
);
486 putty_signal(SIGVTALRM
, fatal_sig_handler
);
489 putty_signal(SIGXCPU
, fatal_sig_handler
);
492 putty_signal(SIGXFSZ
, fatal_sig_handler
);
495 putty_signal(SIGIO
, fatal_sig_handler
);
497 setup_utmp(pty
->name
, display
);
503 pty_utmp_helper_pid
= pid
;
504 pty_utmp_helper_pipe
= pipefd
[1];
510 #ifndef HAVE_NO_SETRESUID
511 int gid
= getgid(), uid
= getuid();
512 int setresgid(gid_t
, gid_t
, gid_t
);
513 int setresuid(uid_t
, uid_t
, uid_t
);
514 setresgid(gid
, gid
, gid
);
515 setresuid(uid
, uid
, uid
);
523 int pty_real_select_result(Pty pty
, int event
, int status
)
527 int finished
= FALSE
;
531 * We've been called because our child process did
532 * something. `status' tells us what.
534 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
536 * The primary child process died. We could keep
537 * the terminal open for remaining subprocesses to
538 * output to, but conventional wisdom seems to feel
539 * that that's the Wrong Thing for an xterm-alike,
540 * so we bail out now (though we don't necessarily
541 * _close_ the window, depending on the state of
542 * Close On Exit). This would be easy enough to
543 * change or make configurable if necessary.
545 pty
->exit_code
= status
;
546 pty
->child_dead
= TRUE
;
547 del234(ptys_by_pid
, pty
);
553 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
556 * Clean termination condition is that either ret == 0, or ret
557 * < 0 and errno == EIO. Not sure why the latter, but it seems
560 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
562 * We assume a clean exit if the pty has closed but the
563 * actual child process hasn't. The only way I can
564 * imagine this happening is if it detaches itself from
565 * the pty and goes daemonic - in which case the
566 * expected usage model would precisely _not_ be for
567 * the pterm window to hang around!
570 if (!pty
->child_dead
)
572 } else if (ret
< 0) {
573 perror("read pty master");
575 } else if (ret
> 0) {
576 from_backend(pty
->frontend
, 0, buf
, ret
);
578 } else if (event
== 2) {
580 * Attempt to send data down the pty.
586 if (finished
&& !pty
->finished
) {
587 uxsel_del(pty
->master_fd
);
591 pty
->finished
= TRUE
;
594 * This is a slight layering-violation sort of hack: only
595 * if we're not closing on exit (COE is set to Never, or to
596 * Only On Clean and it wasn't a clean exit) do we output a
597 * `terminated' message.
599 if (pty
->cfg
.close_on_exit
== FORCE_OFF
||
600 (pty
->cfg
.close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
602 if (WIFEXITED(pty
->exit_code
))
603 sprintf(message
, "\r\n[pterm: process terminated with exit"
604 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
605 else if (WIFSIGNALED(pty
->exit_code
))
606 #ifdef HAVE_NO_STRSIGNAL
607 sprintf(message
, "\r\n[pterm: process terminated on signal"
608 " %d]\r\n", WTERMSIG(pty
->exit_code
));
610 sprintf(message
, "\r\n[pterm: process terminated on signal"
611 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
612 strsignal(WTERMSIG(pty
->exit_code
)));
614 from_backend(pty
->frontend
, 0, message
, strlen(message
));
617 notify_remote_exit(pty
->frontend
);
623 int pty_select_result(int fd
, int event
)
628 if (fd
== pty_signal_pipe
[0]) {
634 read(pty_signal_pipe
[0], c
, 1); /* ignore its value; it'll be `x' */
637 pid
= waitpid(-1, &status
, WNOHANG
);
640 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
643 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
646 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
649 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
655 static void pty_uxsel_setup(Pty pty
)
659 rwx
= 1; /* always want to read from pty */
660 if (bufchain_size(&pty
->output_data
))
661 rwx
|= 2; /* might also want to write to it */
662 uxsel_set(pty
->master_fd
, rwx
, pty_select_result
);
665 * In principle this only needs calling once for all pty
666 * backend instances, but it's simplest just to call it every
667 * time; uxsel won't mind.
669 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
673 * Called to set up the pty.
675 * Returns an error message, or NULL on success.
677 * Also places the canonical host name into `realhost'. It must be
678 * freed by the caller.
680 static const char *pty_init(void *frontend
, void **backend_handle
, Config
*cfg
,
681 char *host
, int port
, char **realhost
, int nodelay
,
686 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
694 pty
= snew(struct pty_tag
);
695 pty
->master_fd
= pty
->slave_fd
= -1;
697 pty_stamped_utmp
= FALSE
;
701 pty
->frontend
= frontend
;
702 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
704 pty
->cfg
= *cfg
; /* structure copy */
705 pty
->term_width
= cfg
->width
;
706 pty
->term_height
= cfg
->height
;
708 if (pty
->master_fd
< 0)
709 pty_open_master(pty
);
712 * Set the backspace character to be whichever of ^H and ^? is
713 * specified by bksp_is_delete.
716 struct termios attrs
;
717 tcgetattr(pty
->master_fd
, &attrs
);
718 attrs
.c_cc
[VERASE
] = cfg
->bksp_is_delete ?
'\177' : '\010';
719 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
724 * Stamp utmp (that is, tell the utmp helper process to do so),
727 if (!cfg
->stamp_utmp
) {
728 close(pty_utmp_helper_pipe
); /* just let the child process die */
729 pty_utmp_helper_pipe
= -1;
731 char *location
= get_x_display(pty
->frontend
);
732 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
734 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
736 perror("pterm: writing to utmp helper process");
737 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
738 pty_utmp_helper_pipe
= -1;
746 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
747 windowid
= get_windowid(pty
->frontend
);
751 * Fork and execute the command.
764 slavefd
= pty_open_slave(pty
);
766 perror("slave pty: open");
770 close(pty
->master_fd
);
771 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
778 ioctl(0, TIOCSCTTY
, 1);
783 close(open(pty
->name
, O_WRONLY
, 0));
786 char *term_env_var
= dupprintf("TERM=%s", cfg
->termtype
);
787 putenv(term_env_var
);
788 /* We mustn't free term_env_var, as putenv links it into the
789 * environment in place.
792 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
794 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
795 putenv(windowid_env_var
);
796 /* We mustn't free windowid_env_var, as putenv links it into the
797 * environment in place.
802 char *e
= cfg
->environmt
;
803 char *var
, *varend
, *val
, *varval
;
806 while (*e
&& *e
!= '\t') e
++;
813 varval
= dupprintf("%.*s=%s", varend
-var
, var
, val
);
816 * We must not free varval, since putenv links it
817 * into the environment _in place_. Weird, but
818 * there we go. Memory usage will be rationalised
819 * as soon as we exec anyway.
825 * SIGINT and SIGQUIT may have been set to ignored by our
826 * parent, particularly by things like sh -c 'pterm &' and
827 * some window managers. SIGCHLD, meanwhile, was blocked
828 * during pt_main() startup. Reverse all this for our child
831 putty_signal(SIGINT
, SIG_DFL
);
832 putty_signal(SIGQUIT
, SIG_DFL
);
833 block_signal(SIGCHLD
, 0);
835 execvp(pty_argv
[0], pty_argv
);
837 char *shell
= getenv("SHELL");
839 if (cfg
->login_shell
) {
840 char *p
= strrchr(shell
, '/');
841 shellname
= snewn(2+strlen(shell
), char);
843 sprintf(shellname
, "-%s", p
);
846 execl(getenv("SHELL"), shellname
, (void *)NULL
);
850 * If we're here, exec has gone badly foom.
855 pty
->child_pid
= pid
;
856 pty
->child_dead
= FALSE
;
857 pty
->finished
= FALSE
;
858 if (pty
->slave_fd
> 0)
859 close(pty
->slave_fd
);
861 ptys_by_pid
= newtree234(pty_compare_by_pid
);
862 add234(ptys_by_pid
, pty
);
865 if (pty_signal_pipe
[0] < 0) {
866 if (pipe(pty_signal_pipe
) < 0) {
870 cloexec(pty_signal_pipe
[0]);
871 cloexec(pty_signal_pipe
[1]);
873 pty_uxsel_setup(pty
);
875 *backend_handle
= pty
;
877 *realhost
= dupprintf("\0");
882 static void pty_reconfig(void *handle
, Config
*cfg
)
884 Pty pty
= (Pty
)handle
;
886 * We don't have much need to reconfigure this backend, but
887 * unfortunately we do need to pick up the setting of Close On
888 * Exit so we know whether to give a `terminated' message.
890 pty
->cfg
= *cfg
; /* structure copy */
894 * Stub routine (never called in pterm).
896 static void pty_free(void *handle
)
898 Pty pty
= (Pty
)handle
;
900 /* Either of these may fail `not found'. That's fine with us. */
901 del234(ptys_by_pid
, pty
);
902 del234(ptys_by_fd
, pty
);
907 static void pty_try_write(Pty pty
)
912 assert(pty
->master_fd
>= 0);
914 while (bufchain_size(&pty
->output_data
) > 0) {
915 bufchain_prefix(&pty
->output_data
, &data
, &len
);
916 ret
= write(pty
->master_fd
, data
, len
);
918 if (ret
< 0 && (errno
== EWOULDBLOCK
)) {
920 * We've sent all we can for the moment.
925 perror("write pty master");
928 bufchain_consume(&pty
->output_data
, ret
);
931 pty_uxsel_setup(pty
);
935 * Called to send data down the pty.
937 static int pty_send(void *handle
, char *buf
, int len
)
939 Pty pty
= (Pty
)handle
;
941 if (pty
->master_fd
< 0)
942 return 0; /* ignore all writes if fd closed */
944 bufchain_add(&pty
->output_data
, buf
, len
);
947 return bufchain_size(&pty
->output_data
);
950 static void pty_close(Pty pty
)
952 if (pty
->master_fd
>= 0) {
953 close(pty
->master_fd
);
957 if (pty_utmp_helper_pipe
>= 0) {
958 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
959 pty_utmp_helper_pipe
= -1;
965 * Called to query the current socket sendability status.
967 static int pty_sendbuffer(void *handle
)
969 /* Pty pty = (Pty)handle; */
974 * Called to set the size of the window
976 static void pty_size(void *handle
, int width
, int height
)
978 Pty pty
= (Pty
)handle
;
981 pty
->term_width
= width
;
982 pty
->term_height
= height
;
984 size
.ws_row
= (unsigned short)pty
->term_height
;
985 size
.ws_col
= (unsigned short)pty
->term_width
;
986 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
987 font_dimension(pty
->frontend
, 0);
988 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
989 font_dimension(pty
->frontend
, 1);
990 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
995 * Send special codes.
997 static void pty_special(void *handle
, Telnet_Special code
)
999 /* Pty pty = (Pty)handle; */
1005 * Return a list of the special codes that make sense in this
1008 static const struct telnet_special
*pty_get_specials(void *handle
)
1010 /* Pty pty = (Pty)handle; */
1012 * Hmm. When I get round to having this actually usable, it
1013 * might be quite nice to have the ability to deliver a few
1014 * well chosen signals to the child process - SIGINT, SIGTERM,
1020 static int pty_connected(void *handle
)
1022 /* Pty pty = (Pty)handle; */
1026 static int pty_sendok(void *handle
)
1028 /* Pty pty = (Pty)handle; */
1032 static void pty_unthrottle(void *handle
, int backlog
)
1034 /* Pty pty = (Pty)handle; */
1038 static int pty_ldisc(void *handle
, int option
)
1040 /* Pty pty = (Pty)handle; */
1041 return 0; /* neither editing nor echoing */
1044 static void pty_provide_ldisc(void *handle
, void *ldisc
)
1046 /* Pty pty = (Pty)handle; */
1047 /* This is a stub. */
1050 static void pty_provide_logctx(void *handle
, void *logctx
)
1052 /* Pty pty = (Pty)handle; */
1053 /* This is a stub. */
1056 static int pty_exitcode(void *handle
)
1058 Pty pty
= (Pty
)handle
;
1060 return -1; /* not dead yet */
1062 return pty
->exit_code
;
1065 static int pty_cfg_info(void *handle
)
1067 /* Pty pty = (Pty)handle; */
1071 Backend pty_backend
= {