2 * PLink - a command-line (stdin/stdout) variant of PuTTY.
15 #include <sys/ioctl.h>
17 #ifndef HAVE_NO_SYS_SELECT_H
18 #include <sys/select.h>
21 #define PUTTY_DO_GLOBALS /* actually _define_ globals */
26 #define MAX_STDIN_BACKLOG 4096
30 static struct termios orig_termios;
32 void fatalbox(char *p, ...)
37 fprintf(stderr, "FATAL ERROR: ");
39 vfprintf(stderr, p, ap);
49 void modalfatalbox(char *p, ...)
54 fprintf(stderr, "FATAL ERROR: ");
56 vfprintf(stderr, p, ap);
66 void nonfatal(char *p, ...)
71 fprintf(stderr, "ERROR: ");
73 vfprintf(stderr, p, ap);
78 void connection_fatal(void *frontend, char *p, ...)
83 fprintf(stderr, "FATAL ERROR: ");
85 vfprintf(stderr, p, ap);
95 void cmdline_error(char *p, ...)
100 fprintf(stderr, "plink: ");
102 vfprintf(stderr, p, ap);
109 static int local_tty = FALSE; /* do we have a local tty? */
111 static Backend *back;
112 static void *backhandle;
116 * Default settings that are specific to Unix plink.
118 char *platform_default_s(const char *name)
120 if (!strcmp(name, "TermType"))
121 return dupstr(getenv("TERM"));
122 if (!strcmp(name, "SerialLine"))
123 return dupstr("/dev/ttyS0");
127 int platform_default_i(const char *name, int def)
132 FontSpec *platform_default_fontspec(const char *name)
134 return fontspec_new("");
137 Filename *platform_default_filename(const char *name)
139 if (!strcmp(name, "LogFileName"))
140 return filename_from_str("putty.log");
142 return filename_from_str("");
145 char *x_get_default(const char *key)
147 return NULL; /* this is a stub */
149 int term_ldisc(Terminal *term, int mode)
153 void ldisc_update(void *frontend, int echo, int edit)
155 /* Update stdin read mode to reflect changes in line discipline. */
158 if (!local_tty) return;
163 mode.c_lflag |= ECHO;
165 mode.c_lflag &= ~ECHO;
168 mode.c_iflag |= ICRNL;
169 mode.c_lflag |= ISIG | ICANON;
170 mode.c_oflag |= OPOST;
172 mode.c_iflag &= ~ICRNL;
173 mode.c_lflag &= ~(ISIG | ICANON);
174 mode.c_oflag &= ~OPOST;
175 /* Solaris sets these to unhelpful values */
177 mode.c_cc[VTIME] = 0;
178 /* FIXME: perhaps what we do with IXON/IXOFF should be an
179 * argument to ldisc_update(), to allow implementation of SSH-2
180 * "xon-xoff" and Rlogin's equivalent? */
181 mode.c_iflag &= ~IXON;
182 mode.c_iflag &= ~IXOFF;
185 * Mark parity errors and (more important) BREAK on input. This
186 * is more complex than it need be because POSIX-2001 suggests
187 * that escaping of valid 0xff in the input stream is dependent on
188 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
189 * 2.0 goes one worse and makes it dependent on INPCK too. We
190 * deal with this by forcing these flags into a useful state and
191 * then faking the state in which we found them in from_tty() if
192 * we get passed a parity or framing error.
194 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
196 tcsetattr(STDIN_FILENO, TCSANOW, &mode);
199 /* Helper function to extract a special character from a termios. */
200 static char *get_ttychar(struct termios *t, int index)
202 cc_t c = t->c_cc[index];
203 #if defined(_POSIX_VDISABLE)
204 if (c == _POSIX_VDISABLE)
207 return dupprintf("^<%d>", c);
210 char *get_ttymode(void *frontend, const char *mode)
213 * Propagate appropriate terminal modes from the local terminal,
216 if (!local_tty) return NULL;
218 #define GET_CHAR(ourname, uxname) \
220 if (strcmp(mode, ourname) == 0) \
221 return get_ttychar(&orig_termios, uxname); \
223 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
225 if (strcmp(mode, ourname) == 0) { \
226 int b = (orig_termios.uxmemb & uxname) != 0; \
228 return dupprintf("%d", b); \
233 * Modes that want to be the same on all terminal devices involved.
235 /* All the special characters supported by SSH */
237 GET_CHAR("INTR", VINTR);
240 GET_CHAR("QUIT", VQUIT);
243 GET_CHAR("ERASE", VERASE);
246 GET_CHAR("KILL", VKILL);
249 GET_CHAR("EOF", VEOF);
252 GET_CHAR("EOL", VEOL);
255 GET_CHAR("EOL2", VEOL2);
258 GET_CHAR("START", VSTART);
261 GET_CHAR("STOP", VSTOP);
264 GET_CHAR("SUSP", VSUSP);
267 GET_CHAR("DSUSP", VDSUSP);
269 #if defined(VREPRINT)
270 GET_CHAR("REPRINT", VREPRINT);
273 GET_CHAR("WERASE", VWERASE);
276 GET_CHAR("LNEXT", VLNEXT);
279 GET_CHAR("FLUSH", VFLUSH);
282 GET_CHAR("SWTCH", VSWTCH);
285 GET_CHAR("STATUS", VSTATUS);
287 #if defined(VDISCARD)
288 GET_CHAR("DISCARD", VDISCARD);
290 /* Modes that "configure" other major modes. These should probably be
291 * considered as user preferences. */
292 /* Configuration of ICANON */
294 GET_BOOL("ECHOK", ECHOK, c_lflag, );
297 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
300 GET_BOOL("ECHOE", ECHOE, c_lflag, );
303 GET_BOOL("ECHONL", ECHONL, c_lflag, );
306 GET_BOOL("XCASE", XCASE, c_lflag, );
308 /* Configuration of ECHO */
310 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
312 /* Configuration of IXON/IXOFF */
314 GET_BOOL("IXANY", IXANY, c_iflag, );
316 /* Configuration of OPOST */
318 GET_BOOL("OLCUC", OLCUC, c_oflag, );
321 GET_BOOL("ONLCR", ONLCR, c_oflag, );
324 GET_BOOL("OCRNL", OCRNL, c_oflag, );
327 GET_BOOL("ONOCR", ONOCR, c_oflag, );
330 GET_BOOL("ONLRET", ONLRET, c_oflag, );
334 * Modes that want to be set in only one place, and that we have
338 GET_BOOL("ISIG", ISIG, c_lflag, );
341 GET_BOOL("ICANON", ICANON, c_lflag, );
344 GET_BOOL("ECHO", ECHO, c_lflag, );
347 GET_BOOL("IXON", IXON, c_iflag, );
350 GET_BOOL("IXOFF", IXOFF, c_iflag, );
353 GET_BOOL("OPOST", OPOST, c_oflag, );
357 * We do not propagate the following modes:
358 * - Parity/serial settings, which are a local affair and don't
359 * make sense propagated over SSH's 8-bit byte-stream.
360 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
361 * - Things that want to be enabled in one place that we don't
366 * - Things I don't know what to do with. (FIXME)
367 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
374 /* Fall through to here for unrecognised names, or ones that are
375 * unsupported on this platform */
379 void cleanup_termios(void)
382 tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
385 bufchain stdout_data, stderr_data;
386 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
388 int try_output(int is_stderr)
390 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
391 int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
395 if (bufchain_size(chain) > 0) {
396 int prev_nonblock = nonblock(fd);
398 bufchain_prefix(chain, &senddata, &sendlen);
399 ret = write(fd, senddata, sendlen);
401 bufchain_consume(chain, ret);
402 } while (ret == sendlen && bufchain_size(chain) != 0);
405 if (ret < 0 && errno != EAGAIN) {
406 perror(is_stderr ? "stderr: write" : "stdout: write");
410 if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
411 close(STDOUT_FILENO);
412 outgoingeof = EOF_SENT;
414 return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
417 int from_backend(void *frontend_handle, int is_stderr,
418 const char *data, int len)
421 bufchain_add(&stderr_data, data, len);
422 return try_output(TRUE);
424 assert(outgoingeof == EOF_NO);
425 bufchain_add(&stdout_data, data, len);
426 return try_output(FALSE);
430 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
433 * No "untrusted" output should get here (the way the code is
434 * currently, it's all diverted by FLAG_STDERR).
436 assert(!"Unexpected call to from_backend_untrusted()");
437 return 0; /* not reached */
440 int from_backend_eof(void *frontend_handle)
442 assert(outgoingeof == EOF_NO);
443 outgoingeof = EOF_PENDING;
445 return FALSE; /* do not respond to incoming EOF with outgoing */
448 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
451 ret = cmdline_get_passwd_input(p, in, inlen);
453 ret = console_get_userpass_input(p, in, inlen);
458 * Handle data from a local tty in PARMRK format.
460 static void from_tty(void *vbuf, unsigned len)
462 char *p, *q, *end, *buf = vbuf;
463 static enum {NORMAL, FF, FF00} state = NORMAL;
465 p = buf; end = buf + len;
473 q = memchr(p, '\xff', end - p);
474 if (q == NULL) q = end;
475 back->send(backhandle, p, q - p);
481 back->send(backhandle, p, 1);
484 } else if (*p == '\0') {
491 back->special(backhandle, TS_BRK);
494 * Pretend that PARMRK wasn't set. This involves
495 * faking what INPCK and IGNPAR would have done if
496 * we hadn't overridden them. Unfortunately, we
497 * can't do this entirely correctly because INPCK
498 * distinguishes between framing and parity
499 * errors, but PARMRK format represents both in
500 * the same way. We assume that parity errors are
501 * more common than framing errors, and hence
502 * treat all input errors as being subject to
505 if (orig_termios.c_iflag & INPCK) {
506 /* If IGNPAR is set, we throw away the character. */
507 if (!(orig_termios.c_iflag & IGNPAR)) {
508 /* PE/FE get passed on as NUL. */
510 back->send(backhandle, p, 1);
513 /* INPCK not set. Assume we got a parity error. */
514 back->send(backhandle, p, 1);
525 void sigwinch(int signum)
527 if (write(signalpipe[1], "x", 1) <= 0)
528 /* not much we can do about it */;
532 * In Plink our selects are synchronous, so these functions are
535 int uxsel_input_add(int fd, int rwx) { return 0; }
536 void uxsel_input_remove(int id) { }
539 * Short description of parameters.
541 static void usage(void)
543 printf("Plink: command-line connection utility\n");
545 printf("Usage: plink [options] [user@]host [command]\n");
546 printf(" (\"host\" can also be a PuTTY saved session name)\n");
547 printf("Options:\n");
548 printf(" -V print version information and exit\n");
549 printf(" -pgpfp print PGP key fingerprints and exit\n");
550 printf(" -v show verbose messages\n");
551 printf(" -load sessname Load settings from saved session\n");
552 printf(" -ssh -telnet -rlogin -raw -serial\n");
553 printf(" force use of a particular protocol\n");
554 printf(" -P port connect to specified port\n");
555 printf(" -l user connect with specified username\n");
556 printf(" -batch disable all interactive prompts\n");
557 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
558 printf(" Specify the serial configuration (serial only)\n");
559 printf("The following options only apply to SSH connections:\n");
560 printf(" -pw passw login with specified password\n");
561 printf(" -D [listen-IP:]listen-port\n");
562 printf(" Dynamic SOCKS-based port forwarding\n");
563 printf(" -L [listen-IP:]listen-port:host:port\n");
564 printf(" Forward local port to remote address\n");
565 printf(" -R [listen-IP:]listen-port:host:port\n");
566 printf(" Forward remote port to local address\n");
567 printf(" -X -x enable / disable X11 forwarding\n");
568 printf(" -A -a enable / disable agent forwarding\n");
569 printf(" -t -T enable / disable pty allocation\n");
570 printf(" -1 -2 force use of particular protocol version\n");
571 printf(" -4 -6 force use of IPv4 or IPv6\n");
572 printf(" -C enable compression\n");
573 printf(" -i key private key file for user authentication\n");
574 printf(" -noagent disable use of Pageant\n");
575 printf(" -agent enable use of Pageant\n");
576 printf(" -hostkey aa:bb:cc:...\n");
577 printf(" manually specify a host key (may be repeated)\n");
578 printf(" -m file read remote command(s) from file\n");
579 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
580 printf(" -N don't start a shell/command (SSH-2 only)\n");
581 printf(" -nc host:port\n");
582 printf(" open tunnel in place of session (SSH-2 only)\n");
586 static void version(void)
588 printf("plink: %s\n", ver);
592 void frontend_net_error_pending(void) {}
594 const int share_can_be_downstream = TRUE;
595 const int share_can_be_upstream = TRUE;
597 int main(int argc, char **argv)
603 int i, fdcount, fdsize, fdstate;
607 int use_subsystem = 0;
608 int got_host = FALSE;
613 fdcount = fdsize = 0;
615 * Initialise port and protocol to sensible defaults. (These
616 * will be overridden by more or less anything.)
618 default_protocol = PROT_SSH;
621 bufchain_init(&stdout_data);
622 bufchain_init(&stderr_data);
623 outgoingeof = EOF_NO;
625 flags = FLAG_STDERR | FLAG_STDERR_TTY;
629 * Process the command line.
632 do_defaults(NULL, conf);
633 loaded_session = FALSE;
634 default_protocol = conf_get_int(conf, CONF_protocol);
635 default_port = conf_get_int(conf, CONF_port);
639 * Override the default protocol if PLINK_PROTOCOL is set.
641 char *p = getenv("PLINK_PROTOCOL");
643 const Backend *b = backend_from_name(p);
645 default_protocol = b->protocol;
646 default_port = b->default_port;
647 conf_set_int(conf, CONF_protocol, default_protocol);
648 conf_set_int(conf, CONF_port, default_port);
655 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
659 "plink: option \"%s\" requires an argument\n", p);
661 } else if (ret == 2) {
663 } else if (ret == 1) {
665 } else if (!strcmp(p, "-batch")) {
666 console_batch_mode = 1;
667 } else if (!strcmp(p, "-s")) {
668 /* Save status to write to conf later. */
670 } else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
672 } else if (!strcmp(p, "--help")) {
675 } else if (!strcmp(p, "-pgpfp")) {
678 } else if (!strcmp(p, "-o")) {
681 "plink: option \"-o\" requires an argument\n");
685 provide_xrm_string(*++argv);
688 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
692 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
696 * If the hostname starts with "telnet:", set the
697 * protocol to Telnet and process the string as a
700 if (!strncmp(q, "telnet:", 7)) {
704 if (q[0] == '/' && q[1] == '/')
706 conf_set_int(conf, CONF_protocol, PROT_TELNET);
708 p += host_strcspn(p, ":/");
713 conf_set_int(conf, CONF_port, atoi(p));
715 conf_set_int(conf, CONF_port, -1);
716 conf_set_str(conf, CONF_host, q);
719 char *r, *user, *host;
721 * Before we process the [user@]host string, we
722 * first check for the presence of a protocol
723 * prefix (a protocol name followed by ",").
729 b = backend_from_name(p);
731 default_protocol = b->protocol;
732 conf_set_int(conf, CONF_protocol,
734 portnumber = b->default_port;
740 * A nonzero length string followed by an @ is treated
741 * as a username. (We discount an _initial_ @.) The
742 * rest of the string (or the whole string if no @)
743 * is treated as a session name and/or hostname.
747 p++, r = NULL; /* discount initial @ */
752 user = NULL, host = p;
756 * Now attempt to load a saved session with the
757 * same name as the hostname.
760 Conf *conf2 = conf_new();
761 do_defaults(host, conf2);
762 if (loaded_session || !conf_launchable(conf2)) {
763 /* No settings for this host; use defaults */
764 /* (or session was already loaded with -load) */
765 conf_set_str(conf, CONF_host, host);
766 conf_set_int(conf, CONF_port, default_port);
769 conf_copy_into(conf, conf2);
770 loaded_session = TRUE;
776 /* Patch in specified username. */
777 conf_set_str(conf, CONF_username, user);
784 cmdlen = cmdsize = 0;
789 if (cmdlen >= cmdsize) {
790 cmdsize = cmdlen + 512;
791 command = sresize(command, cmdsize, char);
793 command[cmdlen++]=*p++;
795 if (cmdlen >= cmdsize) {
796 cmdsize = cmdlen + 512;
797 command = sresize(command, cmdsize, char);
799 command[cmdlen++]=' '; /* always add trailing space */
800 if (--argc) p = *++argv;
802 if (cmdlen) command[--cmdlen]='\0';
803 /* change trailing blank to NUL */
804 conf_set_str(conf, CONF_remote_cmd, command);
805 conf_set_str(conf, CONF_remote_cmd2, "");
806 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
808 break; /* done with cmdline */
816 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
821 * Muck about with the hostname in various ways.
824 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
825 char *host = hostbuf;
829 * Trim leading whitespace.
831 host += strspn(host, " \t");
834 * See if host is of the form user@host, and separate out
835 * the username if so.
837 if (host[0] != '\0') {
838 char *atsign = strrchr(host, '@');
841 conf_set_str(conf, CONF_username, host);
847 * Trim a colon suffix off the hostname if it's there. In
848 * order to protect unbracketed IPv6 address literals
849 * against this treatment, we do not do this if there's
850 * _more_ than one colon.
853 char *c = host_strchr(host, ':');
856 char *d = host_strchr(c+1, ':');
863 * Remove any remaining whitespace.
868 if (*q != ' ' && *q != '\t')
874 conf_set_str(conf, CONF_host, hostbuf);
879 * Perform command-line overrides on session configuration.
881 cmdline_run_saved(conf);
884 * If we have no better ideas for the remote username, use the local
885 * one, as 'ssh' does.
887 if (conf_get_str(conf, CONF_username)[0] == '\0') {
888 char *user = get_username();
890 conf_set_str(conf, CONF_username, user);
896 * Apply subsystem status.
899 conf_set_int(conf, CONF_ssh_subsys, TRUE);
901 if (!*conf_get_str(conf, CONF_remote_cmd) &&
902 !*conf_get_str(conf, CONF_remote_cmd2) &&
903 !*conf_get_str(conf, CONF_ssh_nc_host))
904 flags |= FLAG_INTERACTIVE;
907 * Select protocol. This is farmed out into a table in a
908 * separate file to enable an ssh-free variant.
910 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
913 "Internal fault: Unsupported protocol found\n");
920 if (portnumber != -1)
921 conf_set_int(conf, CONF_port, portnumber);
924 * Block SIGPIPE, so that we'll get EPIPE individually on
925 * particular network connections that go wrong.
927 putty_signal(SIGPIPE, SIG_IGN);
930 * Set up the pipe we'll use to tell us about SIGWINCH.
932 if (pipe(signalpipe) < 0) {
936 putty_signal(SIGWINCH, sigwinch);
939 * Now that we've got the SIGWINCH handler installed, try to find
940 * out the initial terminal size.
942 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &size) >= 0) {
943 conf_set_int(conf, CONF_width, size.ws_col);
944 conf_set_int(conf, CONF_height, size.ws_row);
951 * Unix Plink doesn't provide any way to add forwardings after the
952 * connection is set up, so if there are none now, we can safely set
955 if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
956 !conf_get_int(conf, CONF_x11_forward) &&
957 !conf_get_int(conf, CONF_agentfwd) &&
958 !conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
959 conf_set_int(conf, CONF_ssh_simple, TRUE);
962 * Start up the connection.
964 logctx = log_init(NULL, conf);
965 console_provide_logctx(logctx);
969 /* nodelay is only useful if stdin is a terminal device */
970 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
972 error = back->init(NULL, &backhandle, conf,
973 conf_get_str(conf, CONF_host),
974 conf_get_int(conf, CONF_port),
976 conf_get_int(conf, CONF_tcp_keepalives));
978 fprintf(stderr, "Unable to open connection:\n%s\n", error);
981 back->provide_logctx(backhandle, logctx);
982 ldisc_create(conf, NULL, back, backhandle, NULL);
988 * Set up the initial console mode. We don't care if this call
989 * fails, because we know we aren't necessarily running in a
992 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
993 atexit(cleanup_termios);
994 ldisc_update(NULL, 1, 1);
996 now = GETTICKCOUNT();
999 fd_set rset, wset, xset;
1010 FD_SET_MAX(signalpipe[0], maxfd, rset);
1012 if (connopen && !sending &&
1013 back->connected(backhandle) &&
1014 back->sendok(backhandle) &&
1015 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
1016 /* If we're OK to send, then try to read from stdin. */
1017 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
1020 if (bufchain_size(&stdout_data) > 0) {
1021 /* If we have data for stdout, try to write to stdout. */
1022 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
1025 if (bufchain_size(&stderr_data) > 0) {
1026 /* If we have data for stderr, try to write to stderr. */
1027 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
1030 /* Count the currently active fds. */
1032 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1033 fd = next_fd(&fdstate, &rwx)) i++;
1035 /* Expand the fdlist buffer if necessary. */
1038 fdlist = sresize(fdlist, fdsize, int);
1042 * Add all currently open fds to the select sets, and store
1043 * them in fdlist as well.
1046 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1047 fd = next_fd(&fdstate, &rwx)) {
1048 fdlist[fdcount++] = fd;
1050 FD_SET_MAX(fd, maxfd, rset);
1052 FD_SET_MAX(fd, maxfd, wset);
1054 FD_SET_MAX(fd, maxfd, xset);
1057 if (toplevel_callback_pending()) {
1061 ret = select(maxfd, &rset, &wset, &xset, &tv);
1062 } else if (run_timers(now, &next)) {
1069 now = GETTICKCOUNT();
1070 if (now - then > next - then)
1074 tv.tv_sec = ticks / 1000;
1075 tv.tv_usec = ticks % 1000 * 1000;
1076 ret = select(maxfd, &rset, &wset, &xset, &tv);
1080 now = GETTICKCOUNT();
1081 } while (ret < 0 && errno == EINTR);
1083 ret = select(maxfd, &rset, &wset, &xset, NULL);
1091 for (i = 0; i < fdcount; i++) {
1094 * We must process exceptional notifications before
1095 * ordinary readability ones, or we may go straight
1096 * past the urgent marker.
1098 if (FD_ISSET(fd, &xset))
1099 select_result(fd, 4);
1100 if (FD_ISSET(fd, &rset))
1101 select_result(fd, 1);
1102 if (FD_ISSET(fd, &wset))
1103 select_result(fd, 2);
1106 if (FD_ISSET(signalpipe[0], &rset)) {
1108 struct winsize size;
1109 if (read(signalpipe[0], c, 1) <= 0)
1111 /* ignore its value; it'll be `x' */
1112 if (ioctl(STDIN_FILENO, TIOCGWINSZ, (void *)&size) >= 0)
1113 back->size(backhandle, size.ws_col, size.ws_row);
1116 if (FD_ISSET(STDIN_FILENO, &rset)) {
1120 if (connopen && back->connected(backhandle)) {
1121 ret = read(STDIN_FILENO, buf, sizeof(buf));
1123 perror("stdin: read");
1125 } else if (ret == 0) {
1126 back->special(backhandle, TS_EOF);
1127 sending = FALSE; /* send nothing further after this */
1132 back->send(backhandle, buf, ret);
1137 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1138 back->unthrottle(backhandle, try_output(FALSE));
1141 if (FD_ISSET(STDERR_FILENO, &wset)) {
1142 back->unthrottle(backhandle, try_output(TRUE));
1145 run_toplevel_callbacks();
1147 if ((!connopen || !back->connected(backhandle)) &&
1148 bufchain_size(&stdout_data) == 0 &&
1149 bufchain_size(&stderr_data) == 0)
1150 break; /* we closed the connection */
1152 exitcode = back->exitcode(backhandle);
1154 fprintf(stderr, "Remote process exit code unavailable\n");
1155 exitcode = 1; /* this is an error condition */
1157 cleanup_exit(exitcode);
1158 return exitcode; /* shouldn't happen, but placates gcc */