2 * Pseudo-tty backend for pterm.
18 #include <sys/types.h>
21 #include <sys/ioctl.h>
38 /* updwtmpx() needs the name of the wtmp file. Try to find it. */
41 #define WTMPX_FILE _PATH_WTMPX
43 #define WTMPX_FILE "/var/log/wtmpx"
49 #define LASTLOG_FILE _PATH_LASTLOG
51 #define LASTLOG_FILE "/var/log/lastlog"
56 * Set up a default for vaguely sane systems. The idea is that if
57 * OMIT_UTMP is not defined, then at least one of the symbols which
58 * enable particular forms of utmp processing should be, if only so
59 * that a link error can warn you that you should have defined
60 * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is
61 * the only such symbol.
64 #if !defined HAVE_PUTUTLINE
65 #define HAVE_PUTUTLINE
69 typedef struct pty_tag
*Pty
;
72 * The pty_signal_pipe, along with the SIGCHLD handler, must be
73 * process-global rather than session-specific.
75 static int pty_signal_pipe
[2] = { -1, -1 }; /* obviously bogus initial val */
79 int master_fd
, slave_fd
;
81 char name
[FILENAME_MAX
];
83 int term_width
, term_height
;
84 int child_dead
, finished
;
89 * We store our pty backends in a tree sorted by master fd, so that
90 * when we get an uxsel notification we know which backend instance
91 * is the owner of the pty that caused it.
93 static int pty_compare_by_fd(void *av
, void *bv
)
98 if (a
->master_fd
< b
->master_fd
)
100 else if (a
->master_fd
> b
->master_fd
)
105 static int pty_find_by_fd(void *av
, void *bv
)
110 if (a
< b
->master_fd
)
112 else if (a
> b
->master_fd
)
117 static tree234
*ptys_by_fd
= NULL
;
120 * We also have a tree sorted by child pid, so that when we wait()
121 * in response to the signal we know which backend instance is the
122 * owner of the process that caused the signal.
124 static int pty_compare_by_pid(void *av
, void *bv
)
129 if (a
->child_pid
< b
->child_pid
)
131 else if (a
->child_pid
> b
->child_pid
)
136 static int pty_find_by_pid(void *av
, void *bv
)
141 if (a
< b
->child_pid
)
143 else if (a
> b
->child_pid
)
148 static tree234
*ptys_by_pid
= NULL
;
151 * If we are using pty_pre_init(), it will need to have already
152 * allocated a pty structure, which we must then return from
153 * pty_init() rather than allocating a new one. Here we store that
154 * structure between allocation and use.
156 * Note that although most of this module is entirely capable of
157 * handling multiple ptys in a single process, pty_pre_init() is
158 * fundamentally _dependent_ on there being at most one pty per
159 * process, so the normal static-data constraints don't apply.
161 * Likewise, since utmp is only used via pty_pre_init, it too must
162 * be single-instance, so we can declare utmp-related variables
165 static Pty single_pty
= NULL
;
168 static int pty_utmp_helper_pid
, pty_utmp_helper_pipe
;
169 static int pty_stamped_utmp
;
170 static struct utmpx utmp_entry
;
174 * pty_argv is a grievous hack to allow a proper argv to be passed
175 * through from the Unix command line. Again, it doesn't really
176 * make sense outside a one-pty-per-process setup.
180 static void pty_close(Pty pty
);
183 static void setup_utmp(char *ttyname
, char *location
)
186 struct lastlog lastlog_entry
;
192 pw
= getpwuid(getuid());
193 memset(&utmp_entry
, 0, sizeof(utmp_entry
));
194 utmp_entry
.ut_type
= USER_PROCESS
;
195 utmp_entry
.ut_pid
= getpid();
196 strncpy(utmp_entry
.ut_line
, ttyname
+5, lenof(utmp_entry
.ut_line
));
197 strncpy(utmp_entry
.ut_id
, ttyname
+8, lenof(utmp_entry
.ut_id
));
198 strncpy(utmp_entry
.ut_user
, pw
->pw_name
, lenof(utmp_entry
.ut_user
));
199 strncpy(utmp_entry
.ut_host
, location
, lenof(utmp_entry
.ut_host
));
201 * Apparently there are some architectures where (struct
202 * utmpx).ut_tv is not essentially struct timeval (e.g. Linux
203 * amd64). Hence the temporary.
205 gettimeofday(&tv
, NULL
);
206 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
207 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
210 pututxline(&utmp_entry
);
213 updwtmpx(WTMPX_FILE
, &utmp_entry
);
216 memset(&lastlog_entry
, 0, sizeof(lastlog_entry
));
217 strncpy(lastlog_entry
.ll_line
, ttyname
+5, lenof(lastlog_entry
.ll_line
));
218 strncpy(lastlog_entry
.ll_host
, location
, lenof(lastlog_entry
.ll_host
));
219 time(&lastlog_entry
.ll_time
);
220 if ((lastlog
= fopen(LASTLOG_FILE
, "r+")) != NULL
) {
221 fseek(lastlog
, sizeof(lastlog_entry
) * getuid(), SEEK_SET
);
222 fwrite(&lastlog_entry
, 1, sizeof(lastlog_entry
), lastlog
);
227 pty_stamped_utmp
= 1;
231 static void cleanup_utmp(void)
235 if (!pty_stamped_utmp
)
238 utmp_entry
.ut_type
= DEAD_PROCESS
;
239 memset(utmp_entry
.ut_user
, 0, lenof(utmp_entry
.ut_user
));
240 gettimeofday(&tv
, NULL
);
241 utmp_entry
.ut_tv
.tv_sec
= tv
.tv_sec
;
242 utmp_entry
.ut_tv
.tv_usec
= tv
.tv_usec
;
244 updwtmpx(WTMPX_FILE
, &utmp_entry
);
246 memset(utmp_entry
.ut_line
, 0, lenof(utmp_entry
.ut_line
));
247 utmp_entry
.ut_tv
.tv_sec
= 0;
248 utmp_entry
.ut_tv
.tv_usec
= 0;
251 pututxline(&utmp_entry
);
254 pty_stamped_utmp
= 0; /* ensure we never double-cleanup */
258 static void sigchld_handler(int signum
)
260 write(pty_signal_pipe
[1], "x", 1);
264 static void fatal_sig_handler(int signum
)
266 putty_signal(signum
, SIG_DFL
);
273 static int pty_open_slave(Pty pty
)
275 if (pty
->slave_fd
< 0)
276 pty
->slave_fd
= open(pty
->name
, O_RDWR
);
278 return pty
->slave_fd
;
281 static void pty_open_master(Pty pty
)
284 const char chars1
[] = "pqrstuvwxyz";
285 const char chars2
[] = "0123456789abcdef";
287 char master_name
[20];
290 for (p1
= chars1
; *p1
; p1
++)
291 for (p2
= chars2
; *p2
; p2
++) {
292 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
293 pty
->master_fd
= open(master_name
, O_RDWR
);
294 if (pty
->master_fd
>= 0) {
295 if (geteuid() == 0 ||
296 access(master_name
, R_OK
| W_OK
) == 0) {
298 * We must also check at this point that we are
299 * able to open the slave side of the pty. We
300 * wouldn't want to allocate the wrong master,
301 * get all the way down to forking, and _then_
302 * find we're unable to open the slave.
304 strcpy(pty
->name
, master_name
);
305 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
307 if (pty_open_slave(pty
) >= 0 &&
308 access(pty
->name
, R_OK
| W_OK
) == 0)
310 if (pty
->slave_fd
> 0)
311 close(pty
->slave_fd
);
314 close(pty
->master_fd
);
318 /* If we get here, we couldn't get a tty at all. */
319 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
324 /* We need to chown/chmod the /dev/ttyXX device. */
325 gp
= getgrnam("tty");
326 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
327 chmod(pty
->name
, 0600);
329 pty
->master_fd
= open("/dev/ptmx", O_RDWR
);
331 if (pty
->master_fd
< 0) {
332 perror("/dev/ptmx: open");
336 if (grantpt(pty
->master_fd
) < 0) {
341 if (unlockpt(pty
->master_fd
) < 0) {
346 pty
->name
[FILENAME_MAX
-1] = '\0';
347 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
351 ptys_by_fd
= newtree234(pty_compare_by_fd
);
352 add234(ptys_by_fd
, pty
);
356 * Pre-initialisation. This is here to get around the fact that GTK
357 * doesn't like being run in setuid/setgid programs (probably
358 * sensibly). So before we initialise GTK - and therefore before we
359 * even process the command line - we check to see if we're running
360 * set[ug]id. If so, we open our pty master _now_, chown it as
361 * necessary, and drop privileges. We can always close it again
362 * later. If we're potentially going to be doing utmp as well, we
363 * also fork off a utmp helper process and communicate with it by
364 * means of a pipe; the utmp helper will keep privileges in order
365 * to clean up utmp when we exit (i.e. when its end of our pipe
368 void pty_pre_init(void)
377 pty
= single_pty
= snew(struct pty_tag
);
379 /* set the child signal handler straight away; it needs to be set
380 * before we ever fork. */
381 putty_signal(SIGCHLD
, sigchld_handler
);
382 pty
->master_fd
= pty
->slave_fd
= -1;
384 pty_stamped_utmp
= FALSE
;
387 if (geteuid() != getuid() || getegid() != getgid()) {
388 pty_open_master(pty
);
393 * Fork off the utmp helper.
395 if (pipe(pipefd
) < 0) {
396 perror("pterm: pipe");
401 perror("pterm: fork");
403 } else if (pid
== 0) {
404 char display
[128], buffer
[128];
409 * Now sit here until we receive a display name from the
410 * other end of the pipe, and then stamp utmp. Unstamp utmp
411 * again, and exit, when the pipe closes.
417 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
421 } else if (!pty_stamped_utmp
) {
422 if (dlen
< lenof(display
))
423 memcpy(display
+dlen
, buffer
,
424 min(ret
, lenof(display
)-dlen
));
425 if (buffer
[ret
-1] == '\0') {
427 * Now we have a display name. NUL-terminate
428 * it, and stamp utmp.
430 display
[lenof(display
)-1] = '\0';
432 * Trap as many fatal signals as we can in the
433 * hope of having the best possible chance to
434 * clean up utmp before termination. We are
435 * unfortunately unprotected against SIGKILL,
438 putty_signal(SIGHUP
, fatal_sig_handler
);
439 putty_signal(SIGINT
, fatal_sig_handler
);
440 putty_signal(SIGQUIT
, fatal_sig_handler
);
441 putty_signal(SIGILL
, fatal_sig_handler
);
442 putty_signal(SIGABRT
, fatal_sig_handler
);
443 putty_signal(SIGFPE
, fatal_sig_handler
);
444 putty_signal(SIGPIPE
, fatal_sig_handler
);
445 putty_signal(SIGALRM
, fatal_sig_handler
);
446 putty_signal(SIGTERM
, fatal_sig_handler
);
447 putty_signal(SIGSEGV
, fatal_sig_handler
);
448 putty_signal(SIGUSR1
, fatal_sig_handler
);
449 putty_signal(SIGUSR2
, fatal_sig_handler
);
451 putty_signal(SIGBUS
, fatal_sig_handler
);
454 putty_signal(SIGPOLL
, fatal_sig_handler
);
457 putty_signal(SIGPROF
, fatal_sig_handler
);
460 putty_signal(SIGSYS
, fatal_sig_handler
);
463 putty_signal(SIGTRAP
, fatal_sig_handler
);
466 putty_signal(SIGVTALRM
, fatal_sig_handler
);
469 putty_signal(SIGXCPU
, fatal_sig_handler
);
472 putty_signal(SIGXFSZ
, fatal_sig_handler
);
475 putty_signal(SIGIO
, fatal_sig_handler
);
477 setup_utmp(pty
->name
, display
);
483 pty_utmp_helper_pid
= pid
;
484 pty_utmp_helper_pipe
= pipefd
[1];
490 #ifndef HAVE_NO_SETRESUID
491 int gid
= getgid(), uid
= getuid();
492 int setresgid(gid_t
, gid_t
, gid_t
);
493 int setresuid(uid_t
, uid_t
, uid_t
);
494 setresgid(gid
, gid
, gid
);
495 setresuid(uid
, uid
, uid
);
503 int pty_real_select_result(Pty pty
, int event
, int status
)
507 int finished
= FALSE
;
511 * We've been called because our child process did
512 * something. `status' tells us what.
514 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
516 * The primary child process died. We could keep
517 * the terminal open for remaining subprocesses to
518 * output to, but conventional wisdom seems to feel
519 * that that's the Wrong Thing for an xterm-alike,
520 * so we bail out now (though we don't necessarily
521 * _close_ the window, depending on the state of
522 * Close On Exit). This would be easy enough to
523 * change or make configurable if necessary.
525 pty
->exit_code
= status
;
526 pty
->child_dead
= TRUE
;
527 del234(ptys_by_pid
, pty
);
533 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
536 * Clean termination condition is that either ret == 0, or ret
537 * < 0 and errno == EIO. Not sure why the latter, but it seems
540 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
542 * We assume a clean exit if the pty has closed but the
543 * actual child process hasn't. The only way I can
544 * imagine this happening is if it detaches itself from
545 * the pty and goes daemonic - in which case the
546 * expected usage model would precisely _not_ be for
547 * the pterm window to hang around!
550 if (!pty
->child_dead
)
552 } else if (ret
< 0) {
553 perror("read pty master");
555 } else if (ret
> 0) {
556 from_backend(pty
->frontend
, 0, buf
, ret
);
561 if (finished
&& !pty
->finished
) {
562 uxsel_del(pty
->master_fd
);
566 pty
->finished
= TRUE
;
569 * This is a slight layering-violation sort of hack: only
570 * if we're not closing on exit (COE is set to Never, or to
571 * Only On Clean and it wasn't a clean exit) do we output a
572 * `terminated' message.
574 if (pty
->cfg
.close_on_exit
== FORCE_OFF
||
575 (pty
->cfg
.close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
577 if (WIFEXITED(pty
->exit_code
))
578 sprintf(message
, "\r\n[pterm: process terminated with exit"
579 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
580 else if (WIFSIGNALED(pty
->exit_code
))
581 #ifdef HAVE_NO_STRSIGNAL
582 sprintf(message
, "\r\n[pterm: process terminated on signal"
583 " %d]\r\n", WTERMSIG(pty
->exit_code
));
585 sprintf(message
, "\r\n[pterm: process terminated on signal"
586 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
587 strsignal(WTERMSIG(pty
->exit_code
)));
589 from_backend(pty
->frontend
, 0, message
, strlen(message
));
592 notify_remote_exit(pty
->frontend
);
598 int pty_select_result(int fd
, int event
)
603 if (fd
== pty_signal_pipe
[0]) {
609 read(pty_signal_pipe
[0], c
, 1); /* ignore its value; it'll be `x' */
612 pid
= waitpid(-1, &status
, WNOHANG
);
615 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
618 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
621 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
624 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
630 static void pty_uxsel_setup(Pty pty
)
632 uxsel_set(pty
->master_fd
, 1, pty_select_result
);
635 * In principle this only needs calling once for all pty
636 * backend instances, but it's simplest just to call it every
637 * time; uxsel won't mind.
639 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
643 * Called to set up the pty.
645 * Returns an error message, or NULL on success.
647 * Also places the canonical host name into `realhost'. It must be
648 * freed by the caller.
650 static const char *pty_init(void *frontend
, void **backend_handle
, Config
*cfg
,
651 char *host
, int port
, char **realhost
, int nodelay
,
656 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
664 pty
= snew(struct pty_tag
);
665 pty
->master_fd
= pty
->slave_fd
= -1;
667 pty_stamped_utmp
= FALSE
;
671 pty
->frontend
= frontend
;
672 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
674 pty
->cfg
= *cfg
; /* structure copy */
675 pty
->term_width
= cfg
->width
;
676 pty
->term_height
= cfg
->height
;
678 if (pty
->master_fd
< 0)
679 pty_open_master(pty
);
682 * Set the backspace character to be whichever of ^H and ^? is
683 * specified by bksp_is_delete.
686 struct termios attrs
;
687 tcgetattr(pty
->master_fd
, &attrs
);
688 attrs
.c_cc
[VERASE
] = cfg
->bksp_is_delete ?
'\177' : '\010';
689 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
694 * Stamp utmp (that is, tell the utmp helper process to do so),
697 if (!cfg
->stamp_utmp
) {
698 close(pty_utmp_helper_pipe
); /* just let the child process die */
699 pty_utmp_helper_pipe
= -1;
701 char *location
= get_x_display(pty
->frontend
);
702 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
704 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
706 perror("pterm: writing to utmp helper process");
707 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
708 pty_utmp_helper_pipe
= -1;
716 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
717 windowid
= get_windowid(pty
->frontend
);
721 * Fork and execute the command.
735 slavefd
= pty_open_slave(pty
);
737 perror("slave pty: open");
741 close(pty
->master_fd
);
742 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
748 ioctl(slavefd
, TIOCSCTTY
, 1);
751 tcsetpgrp(slavefd
, pgrp
);
753 close(open(pty
->name
, O_WRONLY
, 0));
755 /* Close everything _else_, for tidiness. */
756 for (i
= 3; i
< 1024; i
++)
759 char *term_env_var
= dupprintf("TERM=%s", cfg
->termtype
);
760 putenv(term_env_var
);
761 /* We mustn't free term_env_var, as putenv links it into the
762 * environment in place.
765 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
767 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
768 putenv(windowid_env_var
);
769 /* We mustn't free windowid_env_var, as putenv links it into the
770 * environment in place.
775 char *e
= cfg
->environmt
;
776 char *var
, *varend
, *val
, *varval
;
779 while (*e
&& *e
!= '\t') e
++;
786 varval
= dupprintf("%.*s=%s", varend
-var
, var
, val
);
789 * We must not free varval, since putenv links it
790 * into the environment _in place_. Weird, but
791 * there we go. Memory usage will be rationalised
792 * as soon as we exec anyway.
798 * SIGINT and SIGQUIT may have been set to ignored by our
799 * parent, particularly by things like sh -c 'pterm &' and
800 * some window managers. SIGCHLD, meanwhile, was blocked
801 * during pt_main() startup. Reverse all this for our child
804 putty_signal(SIGINT
, SIG_DFL
);
805 putty_signal(SIGQUIT
, SIG_DFL
);
806 block_signal(SIGCHLD
, 0);
808 execvp(pty_argv
[0], pty_argv
);
810 char *shell
= getenv("SHELL");
812 if (cfg
->login_shell
) {
813 char *p
= strrchr(shell
, '/');
814 shellname
= snewn(2+strlen(shell
), char);
816 sprintf(shellname
, "-%s", p
);
819 execl(getenv("SHELL"), shellname
, (void *)NULL
);
823 * If we're here, exec has gone badly foom.
828 pty
->child_pid
= pid
;
829 pty
->child_dead
= FALSE
;
830 pty
->finished
= FALSE
;
831 if (pty
->slave_fd
> 0)
832 close(pty
->slave_fd
);
834 ptys_by_pid
= newtree234(pty_compare_by_pid
);
835 add234(ptys_by_pid
, pty
);
838 if (pty_signal_pipe
[0] < 0 && pipe(pty_signal_pipe
) < 0) {
842 pty_uxsel_setup(pty
);
844 *backend_handle
= pty
;
849 static void pty_reconfig(void *handle
, Config
*cfg
)
851 Pty pty
= (Pty
)handle
;
853 * We don't have much need to reconfigure this backend, but
854 * unfortunately we do need to pick up the setting of Close On
855 * Exit so we know whether to give a `terminated' message.
857 pty
->cfg
= *cfg
; /* structure copy */
861 * Stub routine (never called in pterm).
863 static void pty_free(void *handle
)
865 Pty pty
= (Pty
)handle
;
867 /* Either of these may fail `not found'. That's fine with us. */
868 del234(ptys_by_pid
, pty
);
869 del234(ptys_by_fd
, pty
);
875 * Called to send data down the pty.
877 static int pty_send(void *handle
, char *buf
, int len
)
879 Pty pty
= (Pty
)handle
;
881 if (pty
->master_fd
< 0)
882 return 0; /* ignore all writes if fd closed */
885 int ret
= write(pty
->master_fd
, buf
, len
);
887 perror("write pty master");
896 static void pty_close(Pty pty
)
898 if (pty
->master_fd
>= 0) {
899 close(pty
->master_fd
);
903 if (pty_utmp_helper_pipe
>= 0) {
904 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
905 pty_utmp_helper_pipe
= -1;
911 * Called to query the current socket sendability status.
913 static int pty_sendbuffer(void *handle
)
915 /* Pty pty = (Pty)handle; */
920 * Called to set the size of the window
922 static void pty_size(void *handle
, int width
, int height
)
924 Pty pty
= (Pty
)handle
;
927 pty
->term_width
= width
;
928 pty
->term_height
= height
;
930 size
.ws_row
= (unsigned short)pty
->term_height
;
931 size
.ws_col
= (unsigned short)pty
->term_width
;
932 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
933 font_dimension(pty
->frontend
, 0);
934 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
935 font_dimension(pty
->frontend
, 1);
936 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
941 * Send special codes.
943 static void pty_special(void *handle
, Telnet_Special code
)
945 /* Pty pty = (Pty)handle; */
951 * Return a list of the special codes that make sense in this
954 static const struct telnet_special
*pty_get_specials(void *handle
)
956 /* Pty pty = (Pty)handle; */
958 * Hmm. When I get round to having this actually usable, it
959 * might be quite nice to have the ability to deliver a few
960 * well chosen signals to the child process - SIGINT, SIGTERM,
966 static Socket
pty_socket(void *handle
)
968 /* Pty pty = (Pty)handle; */
969 return NULL
; /* shouldn't ever be needed */
972 static int pty_sendok(void *handle
)
974 /* Pty pty = (Pty)handle; */
978 static void pty_unthrottle(void *handle
, int backlog
)
980 /* Pty pty = (Pty)handle; */
984 static int pty_ldisc(void *handle
, int option
)
986 /* Pty pty = (Pty)handle; */
987 return 0; /* neither editing nor echoing */
990 static void pty_provide_ldisc(void *handle
, void *ldisc
)
992 /* Pty pty = (Pty)handle; */
993 /* This is a stub. */
996 static void pty_provide_logctx(void *handle
, void *logctx
)
998 /* Pty pty = (Pty)handle; */
999 /* This is a stub. */
1002 static int pty_exitcode(void *handle
)
1004 Pty pty
= (Pty
)handle
;
1006 return -1; /* not dead yet */
1008 return pty
->exit_code
;
1011 static int pty_cfg_info(void *handle
)
1013 /* Pty pty = (Pty)handle; */
1017 Backend pty_backend
= {