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 if (write(pty_signal_pipe
[1], "x", 1) <= 0)
264 /* not much we can do about it */;
268 static void fatal_sig_handler(int signum
)
270 putty_signal(signum
, SIG_DFL
);
277 static int pty_open_slave(Pty pty
)
279 if (pty
->slave_fd
< 0) {
280 pty
->slave_fd
= open(pty
->name
, O_RDWR
);
281 cloexec(pty
->slave_fd
);
284 return pty
->slave_fd
;
287 static void pty_open_master(Pty pty
)
290 const char chars1
[] = "pqrstuvwxyz";
291 const char chars2
[] = "0123456789abcdef";
293 char master_name
[20];
296 for (p1
= chars1
; *p1
; p1
++)
297 for (p2
= chars2
; *p2
; p2
++) {
298 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
299 pty
->master_fd
= open(master_name
, O_RDWR
);
300 if (pty
->master_fd
>= 0) {
301 if (geteuid() == 0 ||
302 access(master_name
, R_OK
| W_OK
) == 0) {
304 * We must also check at this point that we are
305 * able to open the slave side of the pty. We
306 * wouldn't want to allocate the wrong master,
307 * get all the way down to forking, and _then_
308 * find we're unable to open the slave.
310 strcpy(pty
->name
, master_name
);
311 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
313 cloexec(pty
->master_fd
);
315 if (pty_open_slave(pty
) >= 0 &&
316 access(pty
->name
, R_OK
| W_OK
) == 0)
318 if (pty
->slave_fd
> 0)
319 close(pty
->slave_fd
);
322 close(pty
->master_fd
);
326 /* If we get here, we couldn't get a tty at all. */
327 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
332 /* We need to chown/chmod the /dev/ttyXX device. */
333 gp
= getgrnam("tty");
334 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
335 chmod(pty
->name
, 0600);
337 pty
->master_fd
= open("/dev/ptmx", O_RDWR
);
339 if (pty
->master_fd
< 0) {
340 perror("/dev/ptmx: open");
344 if (grantpt(pty
->master_fd
) < 0) {
349 if (unlockpt(pty
->master_fd
) < 0) {
354 cloexec(pty
->master_fd
);
356 pty
->name
[FILENAME_MAX
-1] = '\0';
357 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
362 * Set the pty master into non-blocking mode.
365 fl
= fcntl(pty
->master_fd
, F_GETFL
);
366 if (fl
!= -1 && !(fl
& O_NONBLOCK
))
367 fcntl(pty
->master_fd
, F_SETFL
, fl
| O_NONBLOCK
);
371 ptys_by_fd
= newtree234(pty_compare_by_fd
);
372 add234(ptys_by_fd
, pty
);
376 * Pre-initialisation. This is here to get around the fact that GTK
377 * doesn't like being run in setuid/setgid programs (probably
378 * sensibly). So before we initialise GTK - and therefore before we
379 * even process the command line - we check to see if we're running
380 * set[ug]id. If so, we open our pty master _now_, chown it as
381 * necessary, and drop privileges. We can always close it again
382 * later. If we're potentially going to be doing utmp as well, we
383 * also fork off a utmp helper process and communicate with it by
384 * means of a pipe; the utmp helper will keep privileges in order
385 * to clean up utmp when we exit (i.e. when its end of our pipe
388 void pty_pre_init(void)
397 pty
= single_pty
= snew(struct pty_tag
);
398 bufchain_init(&pty
->output_data
);
400 /* set the child signal handler straight away; it needs to be set
401 * before we ever fork. */
402 putty_signal(SIGCHLD
, sigchld_handler
);
403 pty
->master_fd
= pty
->slave_fd
= -1;
405 pty_stamped_utmp
= FALSE
;
408 if (geteuid() != getuid() || getegid() != getgid()) {
409 pty_open_master(pty
);
414 * Fork off the utmp helper.
416 if (pipe(pipefd
) < 0) {
417 perror("pterm: pipe");
424 perror("pterm: fork");
426 } else if (pid
== 0) {
427 char display
[128], buffer
[128];
432 * Now sit here until we receive a display name from the
433 * other end of the pipe, and then stamp utmp. Unstamp utmp
434 * again, and exit, when the pipe closes.
440 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
444 } else if (!pty_stamped_utmp
) {
445 if (dlen
< lenof(display
))
446 memcpy(display
+dlen
, buffer
,
447 min(ret
, lenof(display
)-dlen
));
448 if (buffer
[ret
-1] == '\0') {
450 * Now we have a display name. NUL-terminate
451 * it, and stamp utmp.
453 display
[lenof(display
)-1] = '\0';
455 * Trap as many fatal signals as we can in the
456 * hope of having the best possible chance to
457 * clean up utmp before termination. We are
458 * unfortunately unprotected against SIGKILL,
461 putty_signal(SIGHUP
, fatal_sig_handler
);
462 putty_signal(SIGINT
, fatal_sig_handler
);
463 putty_signal(SIGQUIT
, fatal_sig_handler
);
464 putty_signal(SIGILL
, fatal_sig_handler
);
465 putty_signal(SIGABRT
, fatal_sig_handler
);
466 putty_signal(SIGFPE
, fatal_sig_handler
);
467 putty_signal(SIGPIPE
, fatal_sig_handler
);
468 putty_signal(SIGALRM
, fatal_sig_handler
);
469 putty_signal(SIGTERM
, fatal_sig_handler
);
470 putty_signal(SIGSEGV
, fatal_sig_handler
);
471 putty_signal(SIGUSR1
, fatal_sig_handler
);
472 putty_signal(SIGUSR2
, fatal_sig_handler
);
474 putty_signal(SIGBUS
, fatal_sig_handler
);
477 putty_signal(SIGPOLL
, fatal_sig_handler
);
480 putty_signal(SIGPROF
, fatal_sig_handler
);
483 putty_signal(SIGSYS
, fatal_sig_handler
);
486 putty_signal(SIGTRAP
, fatal_sig_handler
);
489 putty_signal(SIGVTALRM
, fatal_sig_handler
);
492 putty_signal(SIGXCPU
, fatal_sig_handler
);
495 putty_signal(SIGXFSZ
, fatal_sig_handler
);
498 putty_signal(SIGIO
, fatal_sig_handler
);
500 setup_utmp(pty
->name
, display
);
506 pty_utmp_helper_pid
= pid
;
507 pty_utmp_helper_pipe
= pipefd
[1];
513 #ifndef HAVE_NO_SETRESUID
514 int gid
= getgid(), uid
= getuid();
515 int setresgid(gid_t
, gid_t
, gid_t
);
516 int setresuid(uid_t
, uid_t
, uid_t
);
517 setresgid(gid
, gid
, gid
);
518 setresuid(uid
, uid
, uid
);
526 int pty_real_select_result(Pty pty
, int event
, int status
)
530 int finished
= FALSE
;
534 * We've been called because our child process did
535 * something. `status' tells us what.
537 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
539 * The primary child process died. We could keep
540 * the terminal open for remaining subprocesses to
541 * output to, but conventional wisdom seems to feel
542 * that that's the Wrong Thing for an xterm-alike,
543 * so we bail out now (though we don't necessarily
544 * _close_ the window, depending on the state of
545 * Close On Exit). This would be easy enough to
546 * change or make configurable if necessary.
548 pty
->exit_code
= status
;
549 pty
->child_dead
= TRUE
;
550 del234(ptys_by_pid
, pty
);
556 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
559 * Clean termination condition is that either ret == 0, or ret
560 * < 0 and errno == EIO. Not sure why the latter, but it seems
563 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
565 * We assume a clean exit if the pty has closed but the
566 * actual child process hasn't. The only way I can
567 * imagine this happening is if it detaches itself from
568 * the pty and goes daemonic - in which case the
569 * expected usage model would precisely _not_ be for
570 * the pterm window to hang around!
573 if (!pty
->child_dead
)
575 } else if (ret
< 0) {
576 perror("read pty master");
578 } else if (ret
> 0) {
579 from_backend(pty
->frontend
, 0, buf
, ret
);
581 } else if (event
== 2) {
583 * Attempt to send data down the pty.
589 if (finished
&& !pty
->finished
) {
590 uxsel_del(pty
->master_fd
);
594 pty
->finished
= TRUE
;
597 * This is a slight layering-violation sort of hack: only
598 * if we're not closing on exit (COE is set to Never, or to
599 * Only On Clean and it wasn't a clean exit) do we output a
600 * `terminated' message.
602 if (pty
->cfg
.close_on_exit
== FORCE_OFF
||
603 (pty
->cfg
.close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
605 if (WIFEXITED(pty
->exit_code
))
606 sprintf(message
, "\r\n[pterm: process terminated with exit"
607 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
608 else if (WIFSIGNALED(pty
->exit_code
))
609 #ifdef HAVE_NO_STRSIGNAL
610 sprintf(message
, "\r\n[pterm: process terminated on signal"
611 " %d]\r\n", WTERMSIG(pty
->exit_code
));
613 sprintf(message
, "\r\n[pterm: process terminated on signal"
614 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
615 strsignal(WTERMSIG(pty
->exit_code
)));
617 from_backend(pty
->frontend
, 0, message
, strlen(message
));
620 notify_remote_exit(pty
->frontend
);
626 int pty_select_result(int fd
, int event
)
631 if (fd
== pty_signal_pipe
[0]) {
637 if (read(pty_signal_pipe
[0], c
, 1) <= 0)
639 /* ignore its value; it'll be `x' */
642 pid
= waitpid(-1, &status
, WNOHANG
);
645 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
648 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
651 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
654 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
660 static void pty_uxsel_setup(Pty pty
)
664 rwx
= 1; /* always want to read from pty */
665 if (bufchain_size(&pty
->output_data
))
666 rwx
|= 2; /* might also want to write to it */
667 uxsel_set(pty
->master_fd
, rwx
, pty_select_result
);
670 * In principle this only needs calling once for all pty
671 * backend instances, but it's simplest just to call it every
672 * time; uxsel won't mind.
674 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
678 * Called to set up the pty.
680 * Returns an error message, or NULL on success.
682 * Also places the canonical host name into `realhost'. It must be
683 * freed by the caller.
685 static const char *pty_init(void *frontend
, void **backend_handle
, Config
*cfg
,
686 char *host
, int port
, char **realhost
, int nodelay
,
691 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
699 pty
= snew(struct pty_tag
);
700 pty
->master_fd
= pty
->slave_fd
= -1;
702 pty_stamped_utmp
= FALSE
;
706 pty
->frontend
= frontend
;
707 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
709 pty
->cfg
= *cfg
; /* structure copy */
710 pty
->term_width
= cfg
->width
;
711 pty
->term_height
= cfg
->height
;
713 if (pty
->master_fd
< 0)
714 pty_open_master(pty
);
717 * Set the backspace character to be whichever of ^H and ^? is
718 * specified by bksp_is_delete.
721 struct termios attrs
;
722 tcgetattr(pty
->master_fd
, &attrs
);
723 attrs
.c_cc
[VERASE
] = cfg
->bksp_is_delete ?
'\177' : '\010';
724 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
729 * Stamp utmp (that is, tell the utmp helper process to do so),
732 if (!cfg
->stamp_utmp
) {
733 close(pty_utmp_helper_pipe
); /* just let the child process die */
734 pty_utmp_helper_pipe
= -1;
736 char *location
= get_x_display(pty
->frontend
);
737 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
739 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
741 perror("pterm: writing to utmp helper process");
742 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
743 pty_utmp_helper_pipe
= -1;
751 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
752 windowid
= get_windowid(pty
->frontend
);
756 * Fork and execute the command.
769 slavefd
= pty_open_slave(pty
);
771 perror("slave pty: open");
775 close(pty
->master_fd
);
776 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
783 ioctl(0, TIOCSCTTY
, 1);
788 close(open(pty
->name
, O_WRONLY
, 0));
791 char *term_env_var
= dupprintf("TERM=%s", cfg
->termtype
);
792 putenv(term_env_var
);
793 /* We mustn't free term_env_var, as putenv links it into the
794 * environment in place.
797 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
799 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
800 putenv(windowid_env_var
);
801 /* We mustn't free windowid_env_var, as putenv links it into the
802 * environment in place.
807 char *e
= cfg
->environmt
;
808 char *var
, *varend
, *val
, *varval
;
811 while (*e
&& *e
!= '\t') e
++;
818 varval
= dupprintf("%.*s=%s", varend
-var
, var
, val
);
821 * We must not free varval, since putenv links it
822 * into the environment _in place_. Weird, but
823 * there we go. Memory usage will be rationalised
824 * as soon as we exec anyway.
830 * SIGINT and SIGQUIT may have been set to ignored by our
831 * parent, particularly by things like sh -c 'pterm &' and
832 * some window managers. SIGCHLD, meanwhile, was blocked
833 * during pt_main() startup. Reverse all this for our child
836 putty_signal(SIGINT
, SIG_DFL
);
837 putty_signal(SIGQUIT
, SIG_DFL
);
838 block_signal(SIGCHLD
, 0);
840 execvp(pty_argv
[0], pty_argv
);
842 char *shell
= getenv("SHELL");
844 if (cfg
->login_shell
) {
845 char *p
= strrchr(shell
, '/');
846 shellname
= snewn(2+strlen(shell
), char);
848 sprintf(shellname
, "-%s", p
);
851 execl(getenv("SHELL"), shellname
, (void *)NULL
);
855 * If we're here, exec has gone badly foom.
860 pty
->child_pid
= pid
;
861 pty
->child_dead
= FALSE
;
862 pty
->finished
= FALSE
;
863 if (pty
->slave_fd
> 0)
864 close(pty
->slave_fd
);
866 ptys_by_pid
= newtree234(pty_compare_by_pid
);
867 add234(ptys_by_pid
, pty
);
870 if (pty_signal_pipe
[0] < 0) {
871 if (pipe(pty_signal_pipe
) < 0) {
875 cloexec(pty_signal_pipe
[0]);
876 cloexec(pty_signal_pipe
[1]);
878 pty_uxsel_setup(pty
);
880 *backend_handle
= pty
;
882 *realhost
= dupprintf("\0");
887 static void pty_reconfig(void *handle
, Config
*cfg
)
889 Pty pty
= (Pty
)handle
;
891 * We don't have much need to reconfigure this backend, but
892 * unfortunately we do need to pick up the setting of Close On
893 * Exit so we know whether to give a `terminated' message.
895 pty
->cfg
= *cfg
; /* structure copy */
899 * Stub routine (never called in pterm).
901 static void pty_free(void *handle
)
903 Pty pty
= (Pty
)handle
;
905 /* Either of these may fail `not found'. That's fine with us. */
906 del234(ptys_by_pid
, pty
);
907 del234(ptys_by_fd
, pty
);
912 static void pty_try_write(Pty pty
)
917 assert(pty
->master_fd
>= 0);
919 while (bufchain_size(&pty
->output_data
) > 0) {
920 bufchain_prefix(&pty
->output_data
, &data
, &len
);
921 ret
= write(pty
->master_fd
, data
, len
);
923 if (ret
< 0 && (errno
== EWOULDBLOCK
)) {
925 * We've sent all we can for the moment.
930 perror("write pty master");
933 bufchain_consume(&pty
->output_data
, ret
);
936 pty_uxsel_setup(pty
);
940 * Called to send data down the pty.
942 static int pty_send(void *handle
, char *buf
, int len
)
944 Pty pty
= (Pty
)handle
;
946 if (pty
->master_fd
< 0)
947 return 0; /* ignore all writes if fd closed */
949 bufchain_add(&pty
->output_data
, buf
, len
);
952 return bufchain_size(&pty
->output_data
);
955 static void pty_close(Pty pty
)
957 if (pty
->master_fd
>= 0) {
958 close(pty
->master_fd
);
962 if (pty_utmp_helper_pipe
>= 0) {
963 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
964 pty_utmp_helper_pipe
= -1;
970 * Called to query the current socket sendability status.
972 static int pty_sendbuffer(void *handle
)
974 /* Pty pty = (Pty)handle; */
979 * Called to set the size of the window
981 static void pty_size(void *handle
, int width
, int height
)
983 Pty pty
= (Pty
)handle
;
986 pty
->term_width
= width
;
987 pty
->term_height
= height
;
989 size
.ws_row
= (unsigned short)pty
->term_height
;
990 size
.ws_col
= (unsigned short)pty
->term_width
;
991 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
992 font_dimension(pty
->frontend
, 0);
993 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
994 font_dimension(pty
->frontend
, 1);
995 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
1000 * Send special codes.
1002 static void pty_special(void *handle
, Telnet_Special code
)
1004 /* Pty pty = (Pty)handle; */
1010 * Return a list of the special codes that make sense in this
1013 static const struct telnet_special
*pty_get_specials(void *handle
)
1015 /* Pty pty = (Pty)handle; */
1017 * Hmm. When I get round to having this actually usable, it
1018 * might be quite nice to have the ability to deliver a few
1019 * well chosen signals to the child process - SIGINT, SIGTERM,
1025 static int pty_connected(void *handle
)
1027 /* Pty pty = (Pty)handle; */
1031 static int pty_sendok(void *handle
)
1033 /* Pty pty = (Pty)handle; */
1037 static void pty_unthrottle(void *handle
, int backlog
)
1039 /* Pty pty = (Pty)handle; */
1043 static int pty_ldisc(void *handle
, int option
)
1045 /* Pty pty = (Pty)handle; */
1046 return 0; /* neither editing nor echoing */
1049 static void pty_provide_ldisc(void *handle
, void *ldisc
)
1051 /* Pty pty = (Pty)handle; */
1052 /* This is a stub. */
1055 static void pty_provide_logctx(void *handle
, void *logctx
)
1057 /* Pty pty = (Pty)handle; */
1058 /* This is a stub. */
1061 static int pty_exitcode(void *handle
)
1063 Pty pty
= (Pty
)handle
;
1065 return -1; /* not dead yet */
1067 return pty
->exit_code
;
1070 static int pty_cfg_info(void *handle
)
1072 /* Pty pty = (Pty)handle; */
1076 Backend pty_backend
= {