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
);
281 return pty
->slave_fd
;
284 static void pty_open_master(Pty pty
)
287 const char chars1
[] = "pqrstuvwxyz";
288 const char chars2
[] = "0123456789abcdef";
290 char master_name
[20];
293 for (p1
= chars1
; *p1
; p1
++)
294 for (p2
= chars2
; *p2
; p2
++) {
295 sprintf(master_name
, "/dev/pty%c%c", *p1
, *p2
);
296 pty
->master_fd
= open(master_name
, O_RDWR
);
297 if (pty
->master_fd
>= 0) {
298 if (geteuid() == 0 ||
299 access(master_name
, R_OK
| W_OK
) == 0) {
301 * We must also check at this point that we are
302 * able to open the slave side of the pty. We
303 * wouldn't want to allocate the wrong master,
304 * get all the way down to forking, and _then_
305 * find we're unable to open the slave.
307 strcpy(pty
->name
, master_name
);
308 pty
->name
[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
310 if (pty_open_slave(pty
) >= 0 &&
311 access(pty
->name
, R_OK
| W_OK
) == 0)
313 if (pty
->slave_fd
> 0)
314 close(pty
->slave_fd
);
317 close(pty
->master_fd
);
321 /* If we get here, we couldn't get a tty at all. */
322 fprintf(stderr
, "pterm: unable to open a pseudo-terminal device\n");
327 /* We need to chown/chmod the /dev/ttyXX device. */
328 gp
= getgrnam("tty");
329 chown(pty
->name
, getuid(), gp ? gp
->gr_gid
: -1);
330 chmod(pty
->name
, 0600);
332 pty
->master_fd
= open("/dev/ptmx", O_RDWR
);
334 if (pty
->master_fd
< 0) {
335 perror("/dev/ptmx: open");
339 if (grantpt(pty
->master_fd
) < 0) {
344 if (unlockpt(pty
->master_fd
) < 0) {
349 pty
->name
[FILENAME_MAX
-1] = '\0';
350 strncpy(pty
->name
, ptsname(pty
->master_fd
), FILENAME_MAX
-1);
355 * Set the pty master into non-blocking mode.
358 ioctl(pty
->master_fd
, FIONBIO
, &i
);
362 ptys_by_fd
= newtree234(pty_compare_by_fd
);
363 add234(ptys_by_fd
, pty
);
367 * Pre-initialisation. This is here to get around the fact that GTK
368 * doesn't like being run in setuid/setgid programs (probably
369 * sensibly). So before we initialise GTK - and therefore before we
370 * even process the command line - we check to see if we're running
371 * set[ug]id. If so, we open our pty master _now_, chown it as
372 * necessary, and drop privileges. We can always close it again
373 * later. If we're potentially going to be doing utmp as well, we
374 * also fork off a utmp helper process and communicate with it by
375 * means of a pipe; the utmp helper will keep privileges in order
376 * to clean up utmp when we exit (i.e. when its end of our pipe
379 void pty_pre_init(void)
388 pty
= single_pty
= snew(struct pty_tag
);
389 bufchain_init(&pty
->output_data
);
391 /* set the child signal handler straight away; it needs to be set
392 * before we ever fork. */
393 putty_signal(SIGCHLD
, sigchld_handler
);
394 pty
->master_fd
= pty
->slave_fd
= -1;
396 pty_stamped_utmp
= FALSE
;
399 if (geteuid() != getuid() || getegid() != getgid()) {
400 pty_open_master(pty
);
405 * Fork off the utmp helper.
407 if (pipe(pipefd
) < 0) {
408 perror("pterm: pipe");
413 perror("pterm: fork");
415 } else if (pid
== 0) {
416 char display
[128], buffer
[128];
421 * Now sit here until we receive a display name from the
422 * other end of the pipe, and then stamp utmp. Unstamp utmp
423 * again, and exit, when the pipe closes.
429 ret
= read(pipefd
[0], buffer
, lenof(buffer
));
433 } else if (!pty_stamped_utmp
) {
434 if (dlen
< lenof(display
))
435 memcpy(display
+dlen
, buffer
,
436 min(ret
, lenof(display
)-dlen
));
437 if (buffer
[ret
-1] == '\0') {
439 * Now we have a display name. NUL-terminate
440 * it, and stamp utmp.
442 display
[lenof(display
)-1] = '\0';
444 * Trap as many fatal signals as we can in the
445 * hope of having the best possible chance to
446 * clean up utmp before termination. We are
447 * unfortunately unprotected against SIGKILL,
450 putty_signal(SIGHUP
, fatal_sig_handler
);
451 putty_signal(SIGINT
, fatal_sig_handler
);
452 putty_signal(SIGQUIT
, fatal_sig_handler
);
453 putty_signal(SIGILL
, fatal_sig_handler
);
454 putty_signal(SIGABRT
, fatal_sig_handler
);
455 putty_signal(SIGFPE
, fatal_sig_handler
);
456 putty_signal(SIGPIPE
, fatal_sig_handler
);
457 putty_signal(SIGALRM
, fatal_sig_handler
);
458 putty_signal(SIGTERM
, fatal_sig_handler
);
459 putty_signal(SIGSEGV
, fatal_sig_handler
);
460 putty_signal(SIGUSR1
, fatal_sig_handler
);
461 putty_signal(SIGUSR2
, fatal_sig_handler
);
463 putty_signal(SIGBUS
, fatal_sig_handler
);
466 putty_signal(SIGPOLL
, fatal_sig_handler
);
469 putty_signal(SIGPROF
, fatal_sig_handler
);
472 putty_signal(SIGSYS
, fatal_sig_handler
);
475 putty_signal(SIGTRAP
, fatal_sig_handler
);
478 putty_signal(SIGVTALRM
, fatal_sig_handler
);
481 putty_signal(SIGXCPU
, fatal_sig_handler
);
484 putty_signal(SIGXFSZ
, fatal_sig_handler
);
487 putty_signal(SIGIO
, fatal_sig_handler
);
489 setup_utmp(pty
->name
, display
);
495 pty_utmp_helper_pid
= pid
;
496 pty_utmp_helper_pipe
= pipefd
[1];
502 #ifndef HAVE_NO_SETRESUID
503 int gid
= getgid(), uid
= getuid();
504 int setresgid(gid_t
, gid_t
, gid_t
);
505 int setresuid(uid_t
, uid_t
, uid_t
);
506 setresgid(gid
, gid
, gid
);
507 setresuid(uid
, uid
, uid
);
515 int pty_real_select_result(Pty pty
, int event
, int status
)
519 int finished
= FALSE
;
523 * We've been called because our child process did
524 * something. `status' tells us what.
526 if ((WIFEXITED(status
) || WIFSIGNALED(status
))) {
528 * The primary child process died. We could keep
529 * the terminal open for remaining subprocesses to
530 * output to, but conventional wisdom seems to feel
531 * that that's the Wrong Thing for an xterm-alike,
532 * so we bail out now (though we don't necessarily
533 * _close_ the window, depending on the state of
534 * Close On Exit). This would be easy enough to
535 * change or make configurable if necessary.
537 pty
->exit_code
= status
;
538 pty
->child_dead
= TRUE
;
539 del234(ptys_by_pid
, pty
);
545 ret
= read(pty
->master_fd
, buf
, sizeof(buf
));
548 * Clean termination condition is that either ret == 0, or ret
549 * < 0 and errno == EIO. Not sure why the latter, but it seems
552 if (ret
== 0 || (ret
< 0 && errno
== EIO
)) {
554 * We assume a clean exit if the pty has closed but the
555 * actual child process hasn't. The only way I can
556 * imagine this happening is if it detaches itself from
557 * the pty and goes daemonic - in which case the
558 * expected usage model would precisely _not_ be for
559 * the pterm window to hang around!
562 if (!pty
->child_dead
)
564 } else if (ret
< 0) {
565 perror("read pty master");
567 } else if (ret
> 0) {
568 from_backend(pty
->frontend
, 0, buf
, ret
);
570 } else if (event
== 2) {
572 * Attempt to send data down the pty.
578 if (finished
&& !pty
->finished
) {
579 uxsel_del(pty
->master_fd
);
583 pty
->finished
= TRUE
;
586 * This is a slight layering-violation sort of hack: only
587 * if we're not closing on exit (COE is set to Never, or to
588 * Only On Clean and it wasn't a clean exit) do we output a
589 * `terminated' message.
591 if (pty
->cfg
.close_on_exit
== FORCE_OFF
||
592 (pty
->cfg
.close_on_exit
== AUTO
&& pty
->exit_code
!= 0)) {
594 if (WIFEXITED(pty
->exit_code
))
595 sprintf(message
, "\r\n[pterm: process terminated with exit"
596 " code %d]\r\n", WEXITSTATUS(pty
->exit_code
));
597 else if (WIFSIGNALED(pty
->exit_code
))
598 #ifdef HAVE_NO_STRSIGNAL
599 sprintf(message
, "\r\n[pterm: process terminated on signal"
600 " %d]\r\n", WTERMSIG(pty
->exit_code
));
602 sprintf(message
, "\r\n[pterm: process terminated on signal"
603 " %d (%.400s)]\r\n", WTERMSIG(pty
->exit_code
),
604 strsignal(WTERMSIG(pty
->exit_code
)));
606 from_backend(pty
->frontend
, 0, message
, strlen(message
));
609 notify_remote_exit(pty
->frontend
);
615 int pty_select_result(int fd
, int event
)
620 if (fd
== pty_signal_pipe
[0]) {
626 read(pty_signal_pipe
[0], c
, 1); /* ignore its value; it'll be `x' */
629 pid
= waitpid(-1, &status
, WNOHANG
);
632 pty
= find234(ptys_by_pid
, &pid
, pty_find_by_pid
);
635 ret
= ret
&& pty_real_select_result(pty
, -1, status
);
638 pty
= find234(ptys_by_fd
, &fd
, pty_find_by_fd
);
641 ret
= ret
&& pty_real_select_result(pty
, event
, 0);
647 static void pty_uxsel_setup(Pty pty
)
651 rwx
= 1; /* always want to read from pty */
652 if (bufchain_size(&pty
->output_data
))
653 rwx
|= 2; /* might also want to write to it */
654 uxsel_set(pty
->master_fd
, rwx
, pty_select_result
);
657 * In principle this only needs calling once for all pty
658 * backend instances, but it's simplest just to call it every
659 * time; uxsel won't mind.
661 uxsel_set(pty_signal_pipe
[0], 1, pty_select_result
);
665 * Called to set up the pty.
667 * Returns an error message, or NULL on success.
669 * Also places the canonical host name into `realhost'. It must be
670 * freed by the caller.
672 static const char *pty_init(void *frontend
, void **backend_handle
, Config
*cfg
,
673 char *host
, int port
, char **realhost
, int nodelay
,
678 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
686 pty
= snew(struct pty_tag
);
687 pty
->master_fd
= pty
->slave_fd
= -1;
689 pty_stamped_utmp
= FALSE
;
693 pty
->frontend
= frontend
;
694 *backend_handle
= NULL
; /* we can't sensibly use this, sadly */
696 pty
->cfg
= *cfg
; /* structure copy */
697 pty
->term_width
= cfg
->width
;
698 pty
->term_height
= cfg
->height
;
700 if (pty
->master_fd
< 0)
701 pty_open_master(pty
);
704 * Set the backspace character to be whichever of ^H and ^? is
705 * specified by bksp_is_delete.
708 struct termios attrs
;
709 tcgetattr(pty
->master_fd
, &attrs
);
710 attrs
.c_cc
[VERASE
] = cfg
->bksp_is_delete ?
'\177' : '\010';
711 tcsetattr(pty
->master_fd
, TCSANOW
, &attrs
);
716 * Stamp utmp (that is, tell the utmp helper process to do so),
719 if (!cfg
->stamp_utmp
) {
720 close(pty_utmp_helper_pipe
); /* just let the child process die */
721 pty_utmp_helper_pipe
= -1;
723 char *location
= get_x_display(pty
->frontend
);
724 int len
= strlen(location
)+1, pos
= 0; /* +1 to include NUL */
726 int ret
= write(pty_utmp_helper_pipe
, location
+pos
, len
- pos
);
728 perror("pterm: writing to utmp helper process");
729 close(pty_utmp_helper_pipe
); /* arrgh, just give up */
730 pty_utmp_helper_pipe
= -1;
738 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
739 windowid
= get_windowid(pty
->frontend
);
743 * Fork and execute the command.
757 slavefd
= pty_open_slave(pty
);
759 perror("slave pty: open");
763 close(pty
->master_fd
);
764 fcntl(slavefd
, F_SETFD
, 0); /* don't close on exec */
770 ioctl(slavefd
, TIOCSCTTY
, 1);
773 tcsetpgrp(slavefd
, pgrp
);
775 close(open(pty
->name
, O_WRONLY
, 0));
777 /* Close everything _else_, for tidiness. */
778 for (i
= 3; i
< 1024; i
++)
781 char *term_env_var
= dupprintf("TERM=%s", cfg
->termtype
);
782 putenv(term_env_var
);
783 /* We mustn't free term_env_var, as putenv links it into the
784 * environment in place.
787 #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */
789 char *windowid_env_var
= dupprintf("WINDOWID=%ld", windowid
);
790 putenv(windowid_env_var
);
791 /* We mustn't free windowid_env_var, as putenv links it into the
792 * environment in place.
797 char *e
= cfg
->environmt
;
798 char *var
, *varend
, *val
, *varval
;
801 while (*e
&& *e
!= '\t') e
++;
808 varval
= dupprintf("%.*s=%s", varend
-var
, var
, val
);
811 * We must not free varval, since putenv links it
812 * into the environment _in place_. Weird, but
813 * there we go. Memory usage will be rationalised
814 * as soon as we exec anyway.
820 * SIGINT and SIGQUIT may have been set to ignored by our
821 * parent, particularly by things like sh -c 'pterm &' and
822 * some window managers. SIGCHLD, meanwhile, was blocked
823 * during pt_main() startup. Reverse all this for our child
826 putty_signal(SIGINT
, SIG_DFL
);
827 putty_signal(SIGQUIT
, SIG_DFL
);
828 block_signal(SIGCHLD
, 0);
830 execvp(pty_argv
[0], pty_argv
);
832 char *shell
= getenv("SHELL");
834 if (cfg
->login_shell
) {
835 char *p
= strrchr(shell
, '/');
836 shellname
= snewn(2+strlen(shell
), char);
838 sprintf(shellname
, "-%s", p
);
841 execl(getenv("SHELL"), shellname
, (void *)NULL
);
845 * If we're here, exec has gone badly foom.
850 pty
->child_pid
= pid
;
851 pty
->child_dead
= FALSE
;
852 pty
->finished
= FALSE
;
853 if (pty
->slave_fd
> 0)
854 close(pty
->slave_fd
);
856 ptys_by_pid
= newtree234(pty_compare_by_pid
);
857 add234(ptys_by_pid
, pty
);
860 if (pty_signal_pipe
[0] < 0 && pipe(pty_signal_pipe
) < 0) {
864 pty_uxsel_setup(pty
);
866 *backend_handle
= pty
;
871 static void pty_reconfig(void *handle
, Config
*cfg
)
873 Pty pty
= (Pty
)handle
;
875 * We don't have much need to reconfigure this backend, but
876 * unfortunately we do need to pick up the setting of Close On
877 * Exit so we know whether to give a `terminated' message.
879 pty
->cfg
= *cfg
; /* structure copy */
883 * Stub routine (never called in pterm).
885 static void pty_free(void *handle
)
887 Pty pty
= (Pty
)handle
;
889 /* Either of these may fail `not found'. That's fine with us. */
890 del234(ptys_by_pid
, pty
);
891 del234(ptys_by_fd
, pty
);
896 static void pty_try_write(Pty pty
)
901 assert(pty
->master_fd
>= 0);
903 while (bufchain_size(&pty
->output_data
) > 0) {
904 bufchain_prefix(&pty
->output_data
, &data
, &len
);
905 ret
= write(pty
->master_fd
, data
, len
);
907 if (ret
< 0 && (errno
== EWOULDBLOCK
)) {
909 * We've sent all we can for the moment.
914 perror("write pty master");
917 bufchain_consume(&pty
->output_data
, ret
);
920 pty_uxsel_setup(pty
);
924 * Called to send data down the pty.
926 static int pty_send(void *handle
, char *buf
, int len
)
928 Pty pty
= (Pty
)handle
;
930 if (pty
->master_fd
< 0)
931 return 0; /* ignore all writes if fd closed */
933 bufchain_add(&pty
->output_data
, buf
, len
);
936 return bufchain_size(&pty
->output_data
);
939 static void pty_close(Pty pty
)
941 if (pty
->master_fd
>= 0) {
942 close(pty
->master_fd
);
946 if (pty_utmp_helper_pipe
>= 0) {
947 close(pty_utmp_helper_pipe
); /* this causes utmp to be cleaned up */
948 pty_utmp_helper_pipe
= -1;
954 * Called to query the current socket sendability status.
956 static int pty_sendbuffer(void *handle
)
958 /* Pty pty = (Pty)handle; */
963 * Called to set the size of the window
965 static void pty_size(void *handle
, int width
, int height
)
967 Pty pty
= (Pty
)handle
;
970 pty
->term_width
= width
;
971 pty
->term_height
= height
;
973 size
.ws_row
= (unsigned short)pty
->term_height
;
974 size
.ws_col
= (unsigned short)pty
->term_width
;
975 size
.ws_xpixel
= (unsigned short) pty
->term_width
*
976 font_dimension(pty
->frontend
, 0);
977 size
.ws_ypixel
= (unsigned short) pty
->term_height
*
978 font_dimension(pty
->frontend
, 1);
979 ioctl(pty
->master_fd
, TIOCSWINSZ
, (void *)&size
);
984 * Send special codes.
986 static void pty_special(void *handle
, Telnet_Special code
)
988 /* Pty pty = (Pty)handle; */
994 * Return a list of the special codes that make sense in this
997 static const struct telnet_special
*pty_get_specials(void *handle
)
999 /* Pty pty = (Pty)handle; */
1001 * Hmm. When I get round to having this actually usable, it
1002 * might be quite nice to have the ability to deliver a few
1003 * well chosen signals to the child process - SIGINT, SIGTERM,
1009 static Socket
pty_socket(void *handle
)
1011 /* Pty pty = (Pty)handle; */
1012 return NULL
; /* shouldn't ever be needed */
1015 static int pty_sendok(void *handle
)
1017 /* Pty pty = (Pty)handle; */
1021 static void pty_unthrottle(void *handle
, int backlog
)
1023 /* Pty pty = (Pty)handle; */
1027 static int pty_ldisc(void *handle
, int option
)
1029 /* Pty pty = (Pty)handle; */
1030 return 0; /* neither editing nor echoing */
1033 static void pty_provide_ldisc(void *handle
, void *ldisc
)
1035 /* Pty pty = (Pty)handle; */
1036 /* This is a stub. */
1039 static void pty_provide_logctx(void *handle
, void *logctx
)
1041 /* Pty pty = (Pty)handle; */
1042 /* This is a stub. */
1045 static int pty_exitcode(void *handle
)
1047 Pty pty
= (Pty
)handle
;
1049 return -1; /* not dead yet */
1051 return pty
->exit_code
;
1054 static int pty_cfg_info(void *handle
)
1056 /* Pty pty = (Pty)handle; */
1060 Backend pty_backend
= {