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
)
140 pid_t a
= *(pid_t
*)av
;
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 pid_t pty_utmp_helper_pid
= -1;
171 static int pty_utmp_helper_pipe
= -1;
172 static int pty_stamped_utmp
;
173 static struct utmpx utmp_entry
;
177 * pty_argv is a grievous hack to allow a proper argv to be passed
178 * through from the Unix command line. Again, it doesn't really
179 * make sense outside a one-pty-per-process setup.
183 static void pty_close(Pty pty
);
184 static void pty_try_write(Pty pty
);
187 static void setup_utmp(char *ttyname
, char *location
)
190 struct lastlog lastlog_entry
;
196 pw
= getpwuid(getuid());
197 memset(&utmp_entry
, 0, sizeof(utmp_entry
));
198 utmp_entry
.ut_type
= USER_PROCESS
;
199 utmp_entry
.ut_pid
= getpid();
200 strncpy(utmp_entry
.ut_line
, ttyname
+5, lenof(utmp_entry
.ut_line
));
201 strncpy(utmp_entry
.ut_id
, ttyname
+8, lenof(utmp_entry
.ut_id
));
202 strncpy(utmp_entry
.ut_user
, pw
->pw_name
, lenof(utmp_entry
.ut_user
));
203 strncpy(utmp_entry
.ut_host
, location
, lenof(utmp_entry
.ut_host
));
205 * Apparently there are some architectures where (struct
206 * utmpx).ut_tv is not essentially struct timeval (e.g. Linux
207 * amd64). Hence the temporary.
209 gettimeofday(&tv
, NULL
);
210 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
211 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
214 pututxline(&utmp_entry
);
217 updwtmpx(WTMPX_FILE
, &utmp_entry
);
220 memset(&lastlog_entry
, 0, sizeof(lastlog_entry
));
221 strncpy(lastlog_entry
.ll_line
, ttyname
+5, lenof(lastlog_entry
.ll_line
));
222 strncpy(lastlog_entry
.ll_host
, location
, lenof(lastlog_entry
.ll_host
));
223 time(&lastlog_entry
.ll_time
);
224 if ((lastlog
= fopen(LASTLOG_FILE
, "r+")) != NULL
) {
225 fseek(lastlog
, sizeof(lastlog_entry
) * getuid(), SEEK_SET
);
226 fwrite(&lastlog_entry
, 1, sizeof(lastlog_entry
), lastlog
);
231 pty_stamped_utmp
= 1;
235 static void cleanup_utmp(void)
239 if (!pty_stamped_utmp
)
242 utmp_entry
.ut_type
= DEAD_PROCESS
;
243 memset(utmp_entry
.ut_user
, 0, lenof(utmp_entry
.ut_user
));
244 gettimeofday(&tv
, NULL
);
245 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
246 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
248 updwtmpx(WTMPX_FILE
, &utmp_entry
);
250 memset(utmp_entry
.ut_line
, 0, lenof(utmp_entry
.ut_line
));
251 utmp_entry
.ut_tv
.tv_sec
= 0;
252 utmp_entry
.ut_tv
.tv_usec
= 0;
255 pututxline(&utmp_entry
);
258 pty_stamped_utmp
= 0; /* ensure we never double-cleanup */
262 static void sigchld_handler(int signum
)
264 if (write(pty_signal_pipe
[1], "x", 1) <= 0)
265 /* not much we can do about it */;
269 static void fatal_sig_handler(int signum
)
271 putty_signal(signum
, SIG_DFL
);
278 static int pty_open_slave(Pty pty
)
280 if (pty
->slave_fd
< 0) {
281 pty
->slave_fd
= open(pty
->name
, O_RDWR
);
282 cloexec(pty
->slave_fd
);
285 return pty
->slave_fd
;
288 static void pty_open_master(Pty pty
)
291 const char chars1
[] = "pqrstuvwxyz";
292 const char chars2
[] = "0123456789abcdef";
294 char master_name
[20];
297 for (p1
= chars1
; *p1
; p1
++)
298 for (p2
= chars2
; *p2
; p2
++) {
299 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
300 pty
->master_fd
= open(master_name
, O_RDWR
);
301 if (pty
->master_fd
>= 0) {
302 if (geteuid() == 0 ||
303 access(master_name
, R_OK
| W_OK
) == 0) {
305 * We must also check at this point that we are
306 * able to open the slave side of the pty. We
307 * wouldn't want to allocate the wrong master,
308 * get all the way down to forking, and _then_
309 * find we're unable to open the slave.
311 strcpy(pty
->name
, master_name
);
312 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
314 cloexec(pty
->master_fd
);
316 if (pty_open_slave(pty
) >= 0 &&
317 access(pty
->name
, R_OK
| W_OK
) == 0)
319 if (pty
->slave_fd
> 0)
320 close(pty
->slave_fd
);
323 close(pty
->master_fd
);
327 /* If we get here, we couldn't get a tty at all. */
328 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
333 /* We need to chown/chmod the /dev/ttyXX device. */
334 gp
= getgrnam("tty");
335 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
336 chmod(pty
->name
, 0600);
339 const int flags
= O_RDWR
345 pty
->master_fd
= open("/dev/ptmx", flags
);
347 if (pty
->master_fd
< 0) {
348 perror("/dev/ptmx: open");
352 if (grantpt(pty
->master_fd
) < 0) {
357 if (unlockpt(pty
->master_fd
) < 0) {
362 cloexec(pty
->master_fd
);
364 pty
->name
[FILENAME_MAX
-1] = '\0';
365 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
370 * Set the pty master into non-blocking mode.
373 fl
= fcntl(pty
->master_fd
, F_GETFL
);
374 if (fl
!= -1 && !(fl
& O_NONBLOCK
))
375 fcntl(pty
->master_fd
, F_SETFL
, fl
| O_NONBLOCK
);
379 ptys_by_fd
= newtree234(pty_compare_by_fd
);
380 add234(ptys_by_fd
, pty
);
384 * Pre-initialisation. This is here to get around the fact that GTK
385 * doesn't like being run in setuid/setgid programs (probably
386 * sensibly). So before we initialise GTK - and therefore before we
387 * even process the command line - we check to see if we're running
388 * set[ug]id. If so, we open our pty master _now_, chown it as
389 * necessary, and drop privileges. We can always close it again
390 * later. If we're potentially going to be doing utmp as well, we
391 * also fork off a utmp helper process and communicate with it by
392 * means of a pipe; the utmp helper will keep privileges in order
393 * to clean up utmp when we exit (i.e. when its end of our pipe
396 void pty_pre_init(void)
405 pty
= single_pty
= snew(struct pty_tag
);
406 bufchain_init(&pty
->output_data
);
408 /* set the child signal handler straight away; it needs to be set
409 * before we ever fork. */
410 putty_signal(SIGCHLD
, sigchld_handler
);
411 pty
->master_fd
= pty
->slave_fd
= -1;
413 pty_stamped_utmp
= FALSE
;
416 if (geteuid() != getuid() || getegid() != getgid()) {
417 pty_open_master(pty
);
421 * Fork off the utmp helper.
423 if (pipe(pipefd
) < 0) {
424 perror("pterm: pipe");
431 perror("pterm: fork");
433 } else if (pid
== 0) {
434 char display
[128], buffer
[128];
439 * Now sit here until we receive a display name from the
440 * other end of the pipe, and then stamp utmp. Unstamp utmp
441 * again, and exit, when the pipe closes.
447 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
451 } else if (!pty_stamped_utmp
) {
452 if (dlen
< lenof(display
))
453 memcpy(display
+dlen
, buffer
,
454 min(ret
, lenof(display
)-dlen
));
455 if (buffer
[ret
-1] == '\0') {
457 * Now we have a display name. NUL-terminate
458 * it, and stamp utmp.
460 display
[lenof(display
)-1] = '\0';
462 * Trap as many fatal signals as we can in the
463 * hope of having the best possible chance to
464 * clean up utmp before termination. We are
465 * unfortunately unprotected against SIGKILL,
468 putty_signal(SIGHUP
, fatal_sig_handler
);
469 putty_signal(SIGINT
, fatal_sig_handler
);
470 putty_signal(SIGQUIT
, fatal_sig_handler
);
471 putty_signal(SIGILL
, fatal_sig_handler
);
472 putty_signal(SIGABRT
, fatal_sig_handler
);
473 putty_signal(SIGFPE
, fatal_sig_handler
);
474 putty_signal(SIGPIPE
, fatal_sig_handler
);
475 putty_signal(SIGALRM
, fatal_sig_handler
);
476 putty_signal(SIGTERM
, fatal_sig_handler
);
477 putty_signal(SIGSEGV
, fatal_sig_handler
);
478 putty_signal(SIGUSR1
, fatal_sig_handler
);
479 putty_signal(SIGUSR2
, fatal_sig_handler
);
481 putty_signal(SIGBUS
, fatal_sig_handler
);
484 putty_signal(SIGPOLL
, fatal_sig_handler
);
487 putty_signal(SIGPROF
, fatal_sig_handler
);
490 putty_signal(SIGSYS
, fatal_sig_handler
);
493 putty_signal(SIGTRAP
, fatal_sig_handler
);
496 putty_signal(SIGVTALRM
, fatal_sig_handler
);
499 putty_signal(SIGXCPU
, fatal_sig_handler
);
502 putty_signal(SIGXFSZ
, fatal_sig_handler
);
505 putty_signal(SIGIO
, fatal_sig_handler
);
507 setup_utmp(pty
->name
, display
);
513 pty_utmp_helper_pid
= pid
;
514 pty_utmp_helper_pipe
= pipefd
[1];
521 #ifndef HAVE_NO_SETRESUID
522 int gid
= getgid(), uid
= getuid();
523 int setresgid(gid_t
, gid_t
, gid_t
);
524 int setresuid(uid_t
, uid_t
, uid_t
);
525 setresgid(gid
, gid
, gid
);
526 setresuid(uid
, uid
, uid
);
534 int pty_real_select_result(Pty pty
, int event
, int status
)
538 int finished
= FALSE
;
542 * We've been called because our child process did
543 * something. `status' tells us what.
545 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
547 * The primary child process died. We could keep
548 * the terminal open for remaining subprocesses to
549 * output to, but conventional wisdom seems to feel
550 * that that's the Wrong Thing for an xterm-alike,
551 * so we bail out now (though we don't necessarily
552 * _close_ the window, depending on the state of
553 * Close On Exit). This would be easy enough to
554 * change or make configurable if necessary.
556 pty
->exit_code
= status
;
557 pty
->child_dead
= TRUE
;
558 del234(ptys_by_pid
, pty
);
564 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
567 * Clean termination condition is that either ret == 0, or ret
568 * < 0 and errno == EIO. Not sure why the latter, but it seems
571 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
573 * We assume a clean exit if the pty has closed but the
574 * actual child process hasn't. The only way I can
575 * imagine this happening is if it detaches itself from
576 * the pty and goes daemonic - in which case the
577 * expected usage model would precisely _not_ be for
578 * the pterm window to hang around!
581 if (!pty
->child_dead
)
583 } else if (ret
< 0) {
584 perror("read pty master");
586 } else if (ret
> 0) {
587 from_backend(pty
->frontend
, 0, buf
, ret
);
589 } else if (event
== 2) {
591 * Attempt to send data down the pty.
597 if (finished
&& !pty
->finished
) {
600 uxsel_del(pty
->master_fd
);
604 pty
->finished
= TRUE
;
607 * This is a slight layering-violation sort of hack: only
608 * if we're not closing on exit (COE is set to Never, or to
609 * Only On Clean and it wasn't a clean exit) do we output a
610 * `terminated' message.
612 close_on_exit
= conf_get_int(pty
->conf
, CONF_close_on_exit
);
613 if (close_on_exit
== FORCE_OFF
||
614 (close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
616 if (WIFEXITED(pty
->exit_code
))
617 sprintf(message
, "\r\n[pterm: process terminated with exit"
618 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
619 else if (WIFSIGNALED(pty
->exit_code
))
620 #ifdef HAVE_NO_STRSIGNAL
621 sprintf(message
, "\r\n[pterm: process terminated on signal"
622 " %d]\r\n", WTERMSIG(pty
->exit_code
));
624 sprintf(message
, "\r\n[pterm: process terminated on signal"
625 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
626 strsignal(WTERMSIG(pty
->exit_code
)));
628 from_backend(pty
->frontend
, 0, message
, strlen(message
));
631 notify_remote_exit(pty
->frontend
);
637 int pty_select_result(int fd
, int event
)
642 if (fd
== pty_signal_pipe
[0]) {
647 if (read(pty_signal_pipe
[0], c
, 1) <= 0)
649 /* ignore its value; it'll be `x' */
652 pid
= waitpid(-1, &status
, WNOHANG
);
654 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
657 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
660 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
663 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
669 static void pty_uxsel_setup(Pty pty
)
673 rwx
= 1; /* always want to read from pty */
674 if (bufchain_size(&pty
->output_data
))
675 rwx
|= 2; /* might also want to write to it */
676 uxsel_set(pty
->master_fd
, rwx
, pty_select_result
);
679 * In principle this only needs calling once for all pty
680 * backend instances, but it's simplest just to call it every
681 * time; uxsel won't mind.
683 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
687 * Called to set up the pty.
689 * Returns an error message, or NULL on success.
691 * Also places the canonical host name into `realhost'. It must be
692 * freed by the caller.
694 static const char *pty_init(void *frontend
, void **backend_handle
, Conf
*conf
,
695 char *host
, int port
, char **realhost
, int nodelay
,
700 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
708 pty
= snew(struct pty_tag
);
709 pty
->master_fd
= pty
->slave_fd
= -1;
711 pty_stamped_utmp
= FALSE
;
715 pty
->frontend
= frontend
;
716 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
718 pty
->conf
= conf_copy(conf
);
719 pty
->term_width
= conf_get_int(conf
, CONF_width
);
720 pty
->term_height
= conf_get_int(conf
, CONF_height
);
722 if (pty
->master_fd
< 0)
723 pty_open_master(pty
);
726 * Set the backspace character to be whichever of ^H and ^? is
727 * specified by bksp_is_delete.
730 struct termios attrs
;
731 tcgetattr(pty
->master_fd
, &attrs
);
732 attrs
.c_cc
[VERASE
] = conf_get_int(conf
, CONF_bksp_is_delete
)
734 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
739 * Stamp utmp (that is, tell the utmp helper process to do so),
742 if (!conf_get_int(conf
, CONF_stamp_utmp
)) {
743 close(pty_utmp_helper_pipe
); /* just let the child process die */
744 pty_utmp_helper_pipe
= -1;
745 } else if (pty_utmp_helper_pipe
>= 0) {
746 char *location
= get_x_display(pty
->frontend
);
747 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
749 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
751 perror("pterm: writing to utmp helper process");
752 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
753 pty_utmp_helper_pipe
= -1;
761 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
762 windowid
= get_windowid(pty
->frontend
);
766 * Fork and execute the command.
779 slavefd
= pty_open_slave(pty
);
781 perror("slave pty: open");
785 close(pty
->master_fd
);
786 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
793 ioctl(0, TIOCSCTTY
, 1);
798 close(open(pty
->name
, O_WRONLY
, 0));
801 char *term_env_var
= dupprintf("TERM=%s",
802 conf_get_str(conf
, CONF_termtype
));
803 putenv(term_env_var
);
804 /* We mustn't free term_env_var, as putenv links it into the
805 * environment in place.
808 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
810 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
811 putenv(windowid_env_var
);
812 /* We mustn't free windowid_env_var, as putenv links it into the
813 * environment in place.
820 for (val
= conf_get_str_strs(conf
, CONF_environmt
, NULL
, &key
);
822 val
= conf_get_str_strs(conf
, CONF_environmt
, key
, &key
)) {
823 char *varval
= dupcat(key
, "=", val
, NULL
);
826 * We must not free varval, since putenv links it
827 * into the environment _in place_. Weird, but
828 * there we go. Memory usage will be rationalised
829 * as soon as we exec anyway.
835 * SIGINT, SIGQUIT and SIGPIPE may have been set to ignored by
836 * our parent, particularly by things like sh -c 'pterm &' and
837 * some window or session managers. SIGCHLD, meanwhile, was
838 * blocked during pt_main() startup. Reverse all this for our
841 putty_signal(SIGINT
, SIG_DFL
);
842 putty_signal(SIGQUIT
, SIG_DFL
);
843 putty_signal(SIGPIPE
, SIG_DFL
);
844 block_signal(SIGCHLD
, 0);
847 * Exec the exact argument list we were given.
849 execvp(pty_argv
[0], pty_argv
);
851 * If that fails, and if we had exactly one argument, pass
852 * that argument to $SHELL -c.
854 * This arranges that we can _either_ follow 'pterm -e'
855 * with a list of argv elements to be fed directly to
856 * exec, _or_ with a single argument containing a command
857 * to be parsed by a shell (but, in cases of doubt, the
858 * former is more reliable).
860 * A quick survey of other terminal emulators' -e options
861 * (as of Debian squeeze) suggests that:
863 * - xterm supports both modes, more or less like this
864 * - gnome-terminal will only accept a one-string shell command
865 * - Eterm, kterm and rxvt will only accept a list of
866 * argv elements (as did older versions of pterm).
868 * It therefore seems important to support both usage
869 * modes in order to be a drop-in replacement for either
870 * xterm or gnome-terminal, and hence for anyone's
871 * plausible uses of the Debian-style alias
872 * 'x-terminal-emulator'...
874 if (pty_argv
[1] == NULL
) {
875 char *shell
= getenv("SHELL");
877 execl(shell
, shell
, "-c", pty_argv
[0], (void *)NULL
);
880 char *shell
= getenv("SHELL");
882 if (conf_get_int(conf
, CONF_login_shell
)) {
883 char *p
= strrchr(shell
, '/');
884 shellname
= snewn(2+strlen(shell
), char);
886 sprintf(shellname
, "-%s", p
);
889 execl(getenv("SHELL"), shellname
, (void *)NULL
);
893 * If we're here, exec has gone badly foom.
898 pty
->child_pid
= pid
;
899 pty
->child_dead
= FALSE
;
900 pty
->finished
= FALSE
;
901 if (pty
->slave_fd
> 0)
902 close(pty
->slave_fd
);
904 ptys_by_pid
= newtree234(pty_compare_by_pid
);
905 add234(ptys_by_pid
, pty
);
908 if (pty_signal_pipe
[0] < 0) {
909 if (pipe(pty_signal_pipe
) < 0) {
913 cloexec(pty_signal_pipe
[0]);
914 cloexec(pty_signal_pipe
[1]);
916 pty_uxsel_setup(pty
);
918 *backend_handle
= pty
;
920 *realhost
= dupprintf("\0");
925 static void pty_reconfig(void *handle
, Conf
*conf
)
927 Pty pty
= (Pty
)handle
;
929 * We don't have much need to reconfigure this backend, but
930 * unfortunately we do need to pick up the setting of Close On
931 * Exit so we know whether to give a `terminated' message.
933 conf_copy_into(pty
->conf
, conf
);
937 * Stub routine (never called in pterm).
939 static void pty_free(void *handle
)
941 Pty pty
= (Pty
)handle
;
943 /* Either of these may fail `not found'. That's fine with us. */
944 del234(ptys_by_pid
, pty
);
945 del234(ptys_by_fd
, pty
);
950 static void pty_try_write(Pty pty
)
955 assert(pty
->master_fd
>= 0);
957 while (bufchain_size(&pty
->output_data
) > 0) {
958 bufchain_prefix(&pty
->output_data
, &data
, &len
);
959 ret
= write(pty
->master_fd
, data
, len
);
961 if (ret
< 0 && (errno
== EWOULDBLOCK
)) {
963 * We've sent all we can for the moment.
968 perror("write pty master");
971 bufchain_consume(&pty
->output_data
, ret
);
974 pty_uxsel_setup(pty
);
978 * Called to send data down the pty.
980 static int pty_send(void *handle
, char *buf
, int len
)
982 Pty pty
= (Pty
)handle
;
984 if (pty
->master_fd
< 0)
985 return 0; /* ignore all writes if fd closed */
987 bufchain_add(&pty
->output_data
, buf
, len
);
990 return bufchain_size(&pty
->output_data
);
993 static void pty_close(Pty pty
)
995 if (pty
->master_fd
>= 0) {
996 close(pty
->master_fd
);
1000 if (pty_utmp_helper_pipe
>= 0) {
1001 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
1002 pty_utmp_helper_pipe
= -1;
1008 * Called to query the current socket sendability status.
1010 static int pty_sendbuffer(void *handle
)
1012 /* Pty pty = (Pty)handle; */
1017 * Called to set the size of the window
1019 static void pty_size(void *handle
, int width
, int height
)
1021 Pty pty
= (Pty
)handle
;
1022 struct winsize size
;
1024 pty
->term_width
= width
;
1025 pty
->term_height
= height
;
1027 size
.ws_row
= (unsigned short)pty
->term_height
;
1028 size
.ws_col
= (unsigned short)pty
->term_width
;
1029 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
1030 font_dimension(pty
->frontend
, 0);
1031 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
1032 font_dimension(pty
->frontend
, 1);
1033 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
1038 * Send special codes.
1040 static void pty_special(void *handle
, Telnet_Special code
)
1042 /* Pty pty = (Pty)handle; */
1048 * Return a list of the special codes that make sense in this
1051 static const struct telnet_special
*pty_get_specials(void *handle
)
1053 /* Pty pty = (Pty)handle; */
1055 * Hmm. When I get round to having this actually usable, it
1056 * might be quite nice to have the ability to deliver a few
1057 * well chosen signals to the child process - SIGINT, SIGTERM,
1063 static int pty_connected(void *handle
)
1065 /* Pty pty = (Pty)handle; */
1069 static int pty_sendok(void *handle
)
1071 /* Pty pty = (Pty)handle; */
1075 static void pty_unthrottle(void *handle
, int backlog
)
1077 /* Pty pty = (Pty)handle; */
1081 static int pty_ldisc(void *handle
, int option
)
1083 /* Pty pty = (Pty)handle; */
1084 return 0; /* neither editing nor echoing */
1087 static void pty_provide_ldisc(void *handle
, void *ldisc
)
1089 /* Pty pty = (Pty)handle; */
1090 /* This is a stub. */
1093 static void pty_provide_logctx(void *handle
, void *logctx
)
1095 /* Pty pty = (Pty)handle; */
1096 /* This is a stub. */
1099 static int pty_exitcode(void *handle
)
1101 Pty pty
= (Pty
)handle
;
1103 return -1; /* not dead yet */
1105 return pty
->exit_code
;
1108 static int pty_cfg_info(void *handle
)
1110 /* Pty pty = (Pty)handle; */
1114 Backend pty_backend
= {