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 #ifdef HAVE_POSIX_OPENPT
346 pty
->master_fd
= posix_openpt(flags
);
348 if (pty
->master_fd
< 0) {
349 perror("posix_openpt");
353 pty
->master_fd
= open("/dev/ptmx", flags
);
355 if (pty
->master_fd
< 0) {
356 perror("/dev/ptmx: open");
361 if (grantpt(pty
->master_fd
) < 0) {
366 if (unlockpt(pty
->master_fd
) < 0) {
371 cloexec(pty
->master_fd
);
373 pty
->name
[FILENAME_MAX
-1] = '\0';
374 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
379 * Set the pty master into non-blocking mode.
382 fl
= fcntl(pty
->master_fd
, F_GETFL
);
383 if (fl
!= -1 && !(fl
& O_NONBLOCK
))
384 fcntl(pty
->master_fd
, F_SETFL
, fl
| O_NONBLOCK
);
388 ptys_by_fd
= newtree234(pty_compare_by_fd
);
389 add234(ptys_by_fd
, pty
);
393 * Pre-initialisation. This is here to get around the fact that GTK
394 * doesn't like being run in setuid/setgid programs (probably
395 * sensibly). So before we initialise GTK - and therefore before we
396 * even process the command line - we check to see if we're running
397 * set[ug]id. If so, we open our pty master _now_, chown it as
398 * necessary, and drop privileges. We can always close it again
399 * later. If we're potentially going to be doing utmp as well, we
400 * also fork off a utmp helper process and communicate with it by
401 * means of a pipe; the utmp helper will keep privileges in order
402 * to clean up utmp when we exit (i.e. when its end of our pipe
405 void pty_pre_init(void)
414 pty
= single_pty
= snew(struct pty_tag
);
415 bufchain_init(&pty
->output_data
);
417 /* set the child signal handler straight away; it needs to be set
418 * before we ever fork. */
419 putty_signal(SIGCHLD
, sigchld_handler
);
420 pty
->master_fd
= pty
->slave_fd
= -1;
422 pty_stamped_utmp
= FALSE
;
425 if (geteuid() != getuid() || getegid() != getgid()) {
426 pty_open_master(pty
);
430 * Fork off the utmp helper.
432 if (pipe(pipefd
) < 0) {
433 perror("pterm: pipe");
440 perror("pterm: fork");
442 } else if (pid
== 0) {
443 char display
[128], buffer
[128];
448 * Now sit here until we receive a display name from the
449 * other end of the pipe, and then stamp utmp. Unstamp utmp
450 * again, and exit, when the pipe closes.
456 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
460 } else if (!pty_stamped_utmp
) {
461 if (dlen
< lenof(display
))
462 memcpy(display
+dlen
, buffer
,
463 min(ret
, lenof(display
)-dlen
));
464 if (buffer
[ret
-1] == '\0') {
466 * Now we have a display name. NUL-terminate
467 * it, and stamp utmp.
469 display
[lenof(display
)-1] = '\0';
471 * Trap as many fatal signals as we can in the
472 * hope of having the best possible chance to
473 * clean up utmp before termination. We are
474 * unfortunately unprotected against SIGKILL,
477 putty_signal(SIGHUP
, fatal_sig_handler
);
478 putty_signal(SIGINT
, fatal_sig_handler
);
479 putty_signal(SIGQUIT
, fatal_sig_handler
);
480 putty_signal(SIGILL
, fatal_sig_handler
);
481 putty_signal(SIGABRT
, fatal_sig_handler
);
482 putty_signal(SIGFPE
, fatal_sig_handler
);
483 putty_signal(SIGPIPE
, fatal_sig_handler
);
484 putty_signal(SIGALRM
, fatal_sig_handler
);
485 putty_signal(SIGTERM
, fatal_sig_handler
);
486 putty_signal(SIGSEGV
, fatal_sig_handler
);
487 putty_signal(SIGUSR1
, fatal_sig_handler
);
488 putty_signal(SIGUSR2
, fatal_sig_handler
);
490 putty_signal(SIGBUS
, fatal_sig_handler
);
493 putty_signal(SIGPOLL
, fatal_sig_handler
);
496 putty_signal(SIGPROF
, fatal_sig_handler
);
499 putty_signal(SIGSYS
, fatal_sig_handler
);
502 putty_signal(SIGTRAP
, fatal_sig_handler
);
505 putty_signal(SIGVTALRM
, fatal_sig_handler
);
508 putty_signal(SIGXCPU
, fatal_sig_handler
);
511 putty_signal(SIGXFSZ
, fatal_sig_handler
);
514 putty_signal(SIGIO
, fatal_sig_handler
);
516 setup_utmp(pty
->name
, display
);
522 pty_utmp_helper_pid
= pid
;
523 pty_utmp_helper_pipe
= pipefd
[1];
530 #ifndef HAVE_NO_SETRESUID
531 int gid
= getgid(), uid
= getuid();
532 int setresgid(gid_t
, gid_t
, gid_t
);
533 int setresuid(uid_t
, uid_t
, uid_t
);
534 if (setresgid(gid
, gid
, gid
) < 0) {
538 if (setresuid(uid
, uid
, uid
) < 0) {
543 if (setgid(getgid()) < 0) {
547 if (setuid(getuid()) < 0) {
555 int pty_real_select_result(Pty pty
, int event
, int status
)
559 int finished
= FALSE
;
563 * We've been called because our child process did
564 * something. `status' tells us what.
566 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
568 * The primary child process died. We could keep
569 * the terminal open for remaining subprocesses to
570 * output to, but conventional wisdom seems to feel
571 * that that's the Wrong Thing for an xterm-alike,
572 * so we bail out now (though we don't necessarily
573 * _close_ the window, depending on the state of
574 * Close On Exit). This would be easy enough to
575 * change or make configurable if necessary.
577 pty
->exit_code
= status
;
578 pty
->child_dead
= TRUE
;
579 del234(ptys_by_pid
, pty
);
585 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
588 * Clean termination condition is that either ret == 0, or ret
589 * < 0 and errno == EIO. Not sure why the latter, but it seems
592 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
594 * We assume a clean exit if the pty has closed but the
595 * actual child process hasn't. The only way I can
596 * imagine this happening is if it detaches itself from
597 * the pty and goes daemonic - in which case the
598 * expected usage model would precisely _not_ be for
599 * the pterm window to hang around!
602 if (!pty
->child_dead
)
604 } else if (ret
< 0) {
605 perror("read pty master");
607 } else if (ret
> 0) {
608 from_backend(pty
->frontend
, 0, buf
, ret
);
610 } else if (event
== 2) {
612 * Attempt to send data down the pty.
618 if (finished
&& !pty
->finished
) {
621 uxsel_del(pty
->master_fd
);
625 pty
->finished
= TRUE
;
628 * This is a slight layering-violation sort of hack: only
629 * if we're not closing on exit (COE is set to Never, or to
630 * Only On Clean and it wasn't a clean exit) do we output a
631 * `terminated' message.
633 close_on_exit
= conf_get_int(pty
->conf
, CONF_close_on_exit
);
634 if (close_on_exit
== FORCE_OFF
||
635 (close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
637 if (WIFEXITED(pty
->exit_code
))
638 sprintf(message
, "\r\n[pterm: process terminated with exit"
639 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
640 else if (WIFSIGNALED(pty
->exit_code
))
641 #ifdef HAVE_NO_STRSIGNAL
642 sprintf(message
, "\r\n[pterm: process terminated on signal"
643 " %d]\r\n", WTERMSIG(pty
->exit_code
));
645 sprintf(message
, "\r\n[pterm: process terminated on signal"
646 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
647 strsignal(WTERMSIG(pty
->exit_code
)));
649 from_backend(pty
->frontend
, 0, message
, strlen(message
));
652 notify_remote_exit(pty
->frontend
);
658 int pty_select_result(int fd
, int event
)
663 if (fd
== pty_signal_pipe
[0]) {
668 if (read(pty_signal_pipe
[0], c
, 1) <= 0)
670 /* ignore its value; it'll be `x' */
673 pid
= waitpid(-1, &status
, WNOHANG
);
675 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
678 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
681 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
684 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
690 static void pty_uxsel_setup(Pty pty
)
694 rwx
= 1; /* always want to read from pty */
695 if (bufchain_size(&pty
->output_data
))
696 rwx
|= 2; /* might also want to write to it */
697 uxsel_set(pty
->master_fd
, rwx
, pty_select_result
);
700 * In principle this only needs calling once for all pty
701 * backend instances, but it's simplest just to call it every
702 * time; uxsel won't mind.
704 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
708 * Called to set up the pty.
710 * Returns an error message, or NULL on success.
712 * Also places the canonical host name into `realhost'. It must be
713 * freed by the caller.
715 static const char *pty_init(void *frontend
, void **backend_handle
, Conf
*conf
,
716 char *host
, int port
, char **realhost
, int nodelay
,
721 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
729 pty
= snew(struct pty_tag
);
730 pty
->master_fd
= pty
->slave_fd
= -1;
732 pty_stamped_utmp
= FALSE
;
736 pty
->frontend
= frontend
;
737 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
739 pty
->conf
= conf_copy(conf
);
740 pty
->term_width
= conf_get_int(conf
, CONF_width
);
741 pty
->term_height
= conf_get_int(conf
, CONF_height
);
743 if (pty
->master_fd
< 0)
744 pty_open_master(pty
);
747 * Set the backspace character to be whichever of ^H and ^? is
748 * specified by bksp_is_delete.
751 struct termios attrs
;
752 tcgetattr(pty
->master_fd
, &attrs
);
753 attrs
.c_cc
[VERASE
] = conf_get_int(conf
, CONF_bksp_is_delete
)
755 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
760 * Stamp utmp (that is, tell the utmp helper process to do so),
763 if (pty_utmp_helper_pipe
>= 0) { /* if it's < 0, we can't anyway */
764 if (!conf_get_int(conf
, CONF_stamp_utmp
)) {
765 close(pty_utmp_helper_pipe
); /* just let the child process die */
766 pty_utmp_helper_pipe
= -1;
768 char *location
= get_x_display(pty
->frontend
);
769 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
771 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
773 perror("pterm: writing to utmp helper process");
774 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
775 pty_utmp_helper_pipe
= -1;
784 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
785 windowid
= get_windowid(pty
->frontend
);
789 * Fork and execute the command.
802 slavefd
= pty_open_slave(pty
);
804 perror("slave pty: open");
808 close(pty
->master_fd
);
809 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
816 ioctl(0, TIOCSCTTY
, 1);
821 close(open(pty
->name
, O_WRONLY
, 0));
824 char *term_env_var
= dupprintf("TERM=%s",
825 conf_get_str(conf
, CONF_termtype
));
826 putenv(term_env_var
);
827 /* We mustn't free term_env_var, as putenv links it into the
828 * environment in place.
831 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
833 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
834 putenv(windowid_env_var
);
835 /* We mustn't free windowid_env_var, as putenv links it into the
836 * environment in place.
843 for (val
= conf_get_str_strs(conf
, CONF_environmt
, NULL
, &key
);
845 val
= conf_get_str_strs(conf
, CONF_environmt
, key
, &key
)) {
846 char *varval
= dupcat(key
, "=", val
, NULL
);
849 * We must not free varval, since putenv links it
850 * into the environment _in place_. Weird, but
851 * there we go. Memory usage will be rationalised
852 * as soon as we exec anyway.
858 * SIGINT, SIGQUIT and SIGPIPE may have been set to ignored by
859 * our parent, particularly by things like sh -c 'pterm &' and
860 * some window or session managers. SIGCHLD, meanwhile, was
861 * blocked during pt_main() startup. Reverse all this for our
864 putty_signal(SIGINT
, SIG_DFL
);
865 putty_signal(SIGQUIT
, SIG_DFL
);
866 putty_signal(SIGPIPE
, SIG_DFL
);
867 block_signal(SIGCHLD
, 0);
870 * Exec the exact argument list we were given.
872 execvp(pty_argv
[0], pty_argv
);
874 * If that fails, and if we had exactly one argument, pass
875 * that argument to $SHELL -c.
877 * This arranges that we can _either_ follow 'pterm -e'
878 * with a list of argv elements to be fed directly to
879 * exec, _or_ with a single argument containing a command
880 * to be parsed by a shell (but, in cases of doubt, the
881 * former is more reliable).
883 * A quick survey of other terminal emulators' -e options
884 * (as of Debian squeeze) suggests that:
886 * - xterm supports both modes, more or less like this
887 * - gnome-terminal will only accept a one-string shell command
888 * - Eterm, kterm and rxvt will only accept a list of
889 * argv elements (as did older versions of pterm).
891 * It therefore seems important to support both usage
892 * modes in order to be a drop-in replacement for either
893 * xterm or gnome-terminal, and hence for anyone's
894 * plausible uses of the Debian-style alias
895 * 'x-terminal-emulator'...
897 if (pty_argv
[1] == NULL
) {
898 char *shell
= getenv("SHELL");
900 execl(shell
, shell
, "-c", pty_argv
[0], (void *)NULL
);
903 char *shell
= getenv("SHELL");
905 if (conf_get_int(conf
, CONF_login_shell
)) {
906 char *p
= strrchr(shell
, '/');
907 shellname
= snewn(2+strlen(shell
), char);
909 sprintf(shellname
, "-%s", p
);
912 execl(getenv("SHELL"), shellname
, (void *)NULL
);
916 * If we're here, exec has gone badly foom.
921 pty
->child_pid
= pid
;
922 pty
->child_dead
= FALSE
;
923 pty
->finished
= FALSE
;
924 if (pty
->slave_fd
> 0)
925 close(pty
->slave_fd
);
927 ptys_by_pid
= newtree234(pty_compare_by_pid
);
928 add234(ptys_by_pid
, pty
);
931 if (pty_signal_pipe
[0] < 0) {
932 if (pipe(pty_signal_pipe
) < 0) {
936 cloexec(pty_signal_pipe
[0]);
937 cloexec(pty_signal_pipe
[1]);
939 pty_uxsel_setup(pty
);
941 *backend_handle
= pty
;
943 *realhost
= dupprintf("\0");
948 static void pty_reconfig(void *handle
, Conf
*conf
)
950 Pty pty
= (Pty
)handle
;
952 * We don't have much need to reconfigure this backend, but
953 * unfortunately we do need to pick up the setting of Close On
954 * Exit so we know whether to give a `terminated' message.
956 conf_copy_into(pty
->conf
, conf
);
960 * Stub routine (never called in pterm).
962 static void pty_free(void *handle
)
964 Pty pty
= (Pty
)handle
;
966 /* Either of these may fail `not found'. That's fine with us. */
967 del234(ptys_by_pid
, pty
);
968 del234(ptys_by_fd
, pty
);
973 static void pty_try_write(Pty pty
)
978 assert(pty
->master_fd
>= 0);
980 while (bufchain_size(&pty
->output_data
) > 0) {
981 bufchain_prefix(&pty
->output_data
, &data
, &len
);
982 ret
= write(pty
->master_fd
, data
, len
);
984 if (ret
< 0 && (errno
== EWOULDBLOCK
)) {
986 * We've sent all we can for the moment.
991 perror("write pty master");
994 bufchain_consume(&pty
->output_data
, ret
);
997 pty_uxsel_setup(pty
);
1001 * Called to send data down the pty.
1003 static int pty_send(void *handle
, char *buf
, int len
)
1005 Pty pty
= (Pty
)handle
;
1007 if (pty
->master_fd
< 0)
1008 return 0; /* ignore all writes if fd closed */
1010 bufchain_add(&pty
->output_data
, buf
, len
);
1013 return bufchain_size(&pty
->output_data
);
1016 static void pty_close(Pty pty
)
1018 if (pty
->master_fd
>= 0) {
1019 close(pty
->master_fd
);
1020 pty
->master_fd
= -1;
1023 if (pty_utmp_helper_pipe
>= 0) {
1024 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
1025 pty_utmp_helper_pipe
= -1;
1031 * Called to query the current socket sendability status.
1033 static int pty_sendbuffer(void *handle
)
1035 /* Pty pty = (Pty)handle; */
1040 * Called to set the size of the window
1042 static void pty_size(void *handle
, int width
, int height
)
1044 Pty pty
= (Pty
)handle
;
1045 struct winsize size
;
1047 pty
->term_width
= width
;
1048 pty
->term_height
= height
;
1050 size
.ws_row
= (unsigned short)pty
->term_height
;
1051 size
.ws_col
= (unsigned short)pty
->term_width
;
1052 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
1053 font_dimension(pty
->frontend
, 0);
1054 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
1055 font_dimension(pty
->frontend
, 1);
1056 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
1061 * Send special codes.
1063 static void pty_special(void *handle
, Telnet_Special code
)
1065 /* Pty pty = (Pty)handle; */
1071 * Return a list of the special codes that make sense in this
1074 static const struct telnet_special
*pty_get_specials(void *handle
)
1076 /* Pty pty = (Pty)handle; */
1078 * Hmm. When I get round to having this actually usable, it
1079 * might be quite nice to have the ability to deliver a few
1080 * well chosen signals to the child process - SIGINT, SIGTERM,
1086 static int pty_connected(void *handle
)
1088 /* Pty pty = (Pty)handle; */
1092 static int pty_sendok(void *handle
)
1094 /* Pty pty = (Pty)handle; */
1098 static void pty_unthrottle(void *handle
, int backlog
)
1100 /* Pty pty = (Pty)handle; */
1104 static int pty_ldisc(void *handle
, int option
)
1106 /* Pty pty = (Pty)handle; */
1107 return 0; /* neither editing nor echoing */
1110 static void pty_provide_ldisc(void *handle
, void *ldisc
)
1112 /* Pty pty = (Pty)handle; */
1113 /* This is a stub. */
1116 static void pty_provide_logctx(void *handle
, void *logctx
)
1118 /* Pty pty = (Pty)handle; */
1119 /* This is a stub. */
1122 static int pty_exitcode(void *handle
)
1124 Pty pty
= (Pty
)handle
;
1126 return -1; /* not dead yet */
1128 return pty
->exit_code
;
1131 static int pty_cfg_info(void *handle
)
1133 /* Pty pty = (Pty)handle; */
1137 Backend pty_backend
= {