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
28 void fatalbox(char *p
, ...)
31 fprintf(stderr
, "FATAL ERROR: ");
33 vfprintf(stderr
, p
, ap
);
38 void modalfatalbox(char *p
, ...)
41 fprintf(stderr
, "FATAL ERROR: ");
43 vfprintf(stderr
, p
, ap
);
48 void connection_fatal(void *frontend
, char *p
, ...)
51 fprintf(stderr
, "FATAL ERROR: ");
53 vfprintf(stderr
, p
, ap
);
58 void cmdline_error(char *p
, ...)
61 fprintf(stderr
, "plink: ");
63 vfprintf(stderr
, p
, ap
);
69 static int local_tty
= 0; /* do we have a local tty? */
70 static struct termios orig_termios
;
73 static void *backhandle
;
77 * Default settings that are specific to pterm.
79 char *platform_default_s(const char *name
)
81 if (!strcmp(name
, "TermType"))
82 return dupstr(getenv("TERM"));
83 if (!strcmp(name
, "UserName"))
84 return get_username();
85 if (!strcmp(name
, "SerialLine"))
86 return dupstr("/dev/ttyS0");
90 int platform_default_i(const char *name
, int def
)
92 if (!strcmp(name
, "TermWidth") ||
93 !strcmp(name
, "TermHeight")) {
95 if (ioctl(0, TIOCGWINSZ
, (void *)&size
) >= 0)
96 return (!strcmp(name
, "TermWidth") ? size
.ws_col
: size
.ws_row
);
101 FontSpec
platform_default_fontspec(const char *name
)
108 Filename
platform_default_filename(const char *name
)
111 if (!strcmp(name
, "LogFileName"))
112 strcpy(ret
.path
, "putty.log");
118 char *x_get_default(const char *key
)
120 return NULL
; /* this is a stub */
122 int term_ldisc(Terminal
*term
, int mode
)
126 void ldisc_update(void *frontend
, int echo
, int edit
)
128 /* Update stdin read mode to reflect changes in line discipline. */
131 if (!local_tty
) return;
136 mode
.c_lflag
|= ECHO
;
138 mode
.c_lflag
&= ~ECHO
;
141 mode
.c_iflag
|= ICRNL
;
142 mode
.c_lflag
|= ISIG
| ICANON
;
143 mode
.c_oflag
|= OPOST
;
145 mode
.c_iflag
&= ~ICRNL
;
146 mode
.c_lflag
&= ~(ISIG
| ICANON
);
147 mode
.c_oflag
&= ~OPOST
;
148 /* Solaris sets these to unhelpful values */
150 mode
.c_cc
[VTIME
] = 0;
151 /* FIXME: perhaps what we do with IXON/IXOFF should be an
152 * argument to ldisc_update(), to allow implementation of SSH-2
153 * "xon-xoff" and Rlogin's equivalent? */
154 mode
.c_iflag
&= ~IXON
;
155 mode
.c_iflag
&= ~IXOFF
;
158 * Mark parity errors and (more important) BREAK on input. This
159 * is more complex than it need be because POSIX-2001 suggests
160 * that escaping of valid 0xff in the input stream is dependent on
161 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
162 * 2.0 goes one worse and makes it dependent on INPCK too. We
163 * deal with this by forcing these flags into a useful state and
164 * then faking the state in which we found them in from_tty() if
165 * we get passed a parity or framing error.
167 mode
.c_iflag
= (mode
.c_iflag
| INPCK
| PARMRK
) & ~IGNPAR
;
169 tcsetattr(0, TCSANOW
, &mode
);
172 /* Helper function to extract a special character from a termios. */
173 static char *get_ttychar(struct termios
*t
, int index
)
175 cc_t c
= t
->c_cc
[index
];
176 #if defined(_POSIX_VDISABLE)
177 if (c
== _POSIX_VDISABLE
)
178 return dupprintf("");
180 return dupprintf("^<%d>", c
);
183 char *get_ttymode(void *frontend
, const char *mode
)
186 * Propagate appropriate terminal modes from the local terminal,
189 if (!local_tty
) return NULL
;
191 #define GET_CHAR(ourname, uxname) \
193 if (strcmp(mode, ourname) == 0) \
194 return get_ttychar(&orig_termios, uxname); \
196 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
198 if (strcmp(mode, ourname) == 0) { \
199 int b = (orig_termios.uxmemb & uxname) != 0; \
201 return dupprintf("%d", b); \
206 * Modes that want to be the same on all terminal devices involved.
208 /* All the special characters supported by SSH */
210 GET_CHAR("INTR", VINTR
);
213 GET_CHAR("QUIT", VQUIT
);
216 GET_CHAR("ERASE", VERASE
);
219 GET_CHAR("KILL", VKILL
);
222 GET_CHAR("EOF", VEOF
);
225 GET_CHAR("EOL", VEOL
);
228 GET_CHAR("EOL2", VEOL2
);
231 GET_CHAR("START", VSTART
);
234 GET_CHAR("STOP", VSTOP
);
237 GET_CHAR("SUSP", VSUSP
);
240 GET_CHAR("DSUSP", VDSUSP
);
242 #if defined(VREPRINT)
243 GET_CHAR("REPRINT", VREPRINT
);
246 GET_CHAR("WERASE", VWERASE
);
249 GET_CHAR("LNEXT", VLNEXT
);
252 GET_CHAR("FLUSH", VFLUSH
);
255 GET_CHAR("SWTCH", VSWTCH
);
258 GET_CHAR("STATUS", VSTATUS
);
260 #if defined(VDISCARD)
261 GET_CHAR("DISCARD", VDISCARD
);
263 /* Modes that "configure" other major modes. These should probably be
264 * considered as user preferences. */
265 /* Configuration of ICANON */
267 GET_BOOL("ECHOK", ECHOK
, c_lflag
, );
270 GET_BOOL("ECHOKE", ECHOKE
, c_lflag
, );
273 GET_BOOL("ECHOE", ECHOE
, c_lflag
, );
276 GET_BOOL("ECHONL", ECHONL
, c_lflag
, );
279 GET_BOOL("XCASE", XCASE
, c_lflag
, );
281 /* Configuration of ECHO */
283 GET_BOOL("ECHOCTL", ECHOCTL
, c_lflag
, );
285 /* Configuration of IXON/IXOFF */
287 GET_BOOL("IXANY", IXANY
, c_iflag
, );
289 /* Configuration of OPOST */
291 GET_BOOL("OLCUC", OLCUC
, c_oflag
, );
294 GET_BOOL("ONLCR", ONLCR
, c_oflag
, );
297 GET_BOOL("OCRNL", OCRNL
, c_oflag
, );
300 GET_BOOL("ONOCR", ONOCR
, c_oflag
, );
303 GET_BOOL("ONLRET", ONLRET
, c_oflag
, );
307 * Modes that want to be set in only one place, and that we have
311 GET_BOOL("ISIG", ISIG
, c_lflag
, );
314 GET_BOOL("ICANON", ICANON
, c_lflag
, );
317 GET_BOOL("ECHO", ECHO
, c_lflag
, );
320 GET_BOOL("IXON", IXON
, c_iflag
, );
323 GET_BOOL("IXOFF", IXOFF
, c_iflag
, );
326 GET_BOOL("OPOST", OPOST
, c_oflag
, );
330 * We do not propagate the following modes:
331 * - Parity/serial settings, which are a local affair and don't
332 * make sense propagated over SSH's 8-bit byte-stream.
333 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
334 * - Things that want to be enabled in one place that we don't
339 * - Things I don't know what to do with. (FIXME)
340 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
347 /* Fall through to here for unrecognised names, or ones that are
348 * unsupported on this platform */
352 void cleanup_termios(void)
355 tcsetattr(0, TCSANOW
, &orig_termios
);
358 bufchain stdout_data
, stderr_data
;
360 void try_output(int is_stderr
)
362 bufchain
*chain
= (is_stderr ?
&stderr_data
: &stdout_data
);
363 int fd
= (is_stderr ?
2 : 1);
367 if (bufchain_size(chain
) == 0)
370 bufchain_prefix(chain
, &senddata
, &sendlen
);
371 ret
= write(fd
, senddata
, sendlen
);
373 bufchain_consume(chain
, ret
);
375 perror(is_stderr ?
"stderr: write" : "stdout: write");
380 int from_backend(void *frontend_handle
, int is_stderr
,
381 const char *data
, int len
)
386 bufchain_add(&stderr_data
, data
, len
);
389 bufchain_add(&stdout_data
, data
, len
);
393 osize
= bufchain_size(&stdout_data
);
394 esize
= bufchain_size(&stderr_data
);
396 return osize
+ esize
;
399 int from_backend_untrusted(void *frontend_handle
, const char *data
, int len
)
402 * No "untrusted" output should get here (the way the code is
403 * currently, it's all diverted by FLAG_STDERR).
405 assert(!"Unexpected call to from_backend_untrusted()");
406 return 0; /* not reached */
409 int get_userpass_input(prompts_t
*p
, unsigned char *in
, int inlen
)
412 ret
= cmdline_get_passwd_input(p
, in
, inlen
);
414 ret
= console_get_userpass_input(p
, in
, inlen
);
419 * Handle data from a local tty in PARMRK format.
421 static void from_tty(void *buf
, unsigned len
)
424 static enum {NORMAL
, FF
, FF00
} state
= NORMAL
;
426 p
= buf
; end
= buf
+ len
;
434 q
= memchr(p
, '\xff', end
- p
);
435 if (q
== NULL
) q
= end
;
436 back
->send(backhandle
, p
, q
- p
);
442 back
->send(backhandle
, p
, 1);
445 } else if (*p
== '\0') {
452 back
->special(backhandle
, TS_BRK
);
455 * Pretend that PARMRK wasn't set. This involves
456 * faking what INPCK and IGNPAR would have done if
457 * we hadn't overridden them. Unfortunately, we
458 * can't do this entirely correctly because INPCK
459 * distinguishes between framing and parity
460 * errors, but PARMRK format represents both in
461 * the same way. We assume that parity errors are
462 * more common than framing errors, and hence
463 * treat all input errors as being subject to
466 if (orig_termios
.c_iflag
& INPCK
) {
467 /* If IGNPAR is set, we throw away the character. */
468 if (!(orig_termios
.c_iflag
& IGNPAR
)) {
469 /* PE/FE get passed on as NUL. */
471 back
->send(backhandle
, p
, 1);
474 /* INPCK not set. Assume we got a parity error. */
475 back
->send(backhandle
, p
, 1);
486 void sigwinch(int signum
)
488 write(signalpipe
[1], "x", 1);
492 * In Plink our selects are synchronous, so these functions are
495 int uxsel_input_add(int fd
, int rwx
) { return 0; }
496 void uxsel_input_remove(int id
) { }
499 * Short description of parameters.
501 static void usage(void)
503 printf("PuTTY Link: command-line connection utility\n");
505 printf("Usage: plink [options] [user@]host [command]\n");
506 printf(" (\"host\" can also be a PuTTY saved session name)\n");
507 printf("Options:\n");
508 printf(" -V print version information and exit\n");
509 printf(" -pgpfp print PGP key fingerprints and exit\n");
510 printf(" -v show verbose messages\n");
511 printf(" -load sessname Load settings from saved session\n");
512 printf(" -ssh -telnet -rlogin -raw\n");
513 printf(" force use of a particular protocol\n");
514 printf(" -P port connect to specified port\n");
515 printf(" -l user connect with specified username\n");
516 printf(" -batch disable all interactive prompts\n");
517 printf("The following options only apply to SSH connections:\n");
518 printf(" -pw passw login with specified password\n");
519 printf(" -D [listen-IP:]listen-port\n");
520 printf(" Dynamic SOCKS-based port forwarding\n");
521 printf(" -L [listen-IP:]listen-port:host:port\n");
522 printf(" Forward local port to remote address\n");
523 printf(" -R [listen-IP:]listen-port:host:port\n");
524 printf(" Forward remote port to local address\n");
525 printf(" -X -x enable / disable X11 forwarding\n");
526 printf(" -A -a enable / disable agent forwarding\n");
527 printf(" -t -T enable / disable pty allocation\n");
528 printf(" -1 -2 force use of particular protocol version\n");
529 printf(" -4 -6 force use of IPv4 or IPv6\n");
530 printf(" -C enable compression\n");
531 printf(" -i key private key file for authentication\n");
532 printf(" -noagent disable use of Pageant\n");
533 printf(" -agent enable use of Pageant\n");
534 printf(" -m file read remote command(s) from file\n");
535 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
536 printf(" -N don't start a shell/command (SSH-2 only)\n");
540 static void version(void)
542 printf("plink: %s\n", ver
);
546 int main(int argc
, char **argv
)
552 int i
, fdcount
, fdsize
, fdstate
;
556 int use_subsystem
= 0;
557 void *ldisc
, *logctx
;
561 fdcount
= fdsize
= 0;
563 * Initialise port and protocol to sensible defaults. (These
564 * will be overridden by more or less anything.)
566 default_protocol
= PROT_SSH
;
571 * Process the command line.
573 do_defaults(NULL
, &cfg
);
574 loaded_session
= FALSE
;
575 default_protocol
= cfg
.protocol
;
576 default_port
= cfg
.port
;
580 * Override the default protocol if PLINK_PROTOCOL is set.
582 char *p
= getenv("PLINK_PROTOCOL");
585 for (i
= 0; backends
[i
].backend
!= NULL
; i
++) {
586 if (!strcmp(backends
[i
].name
, p
)) {
587 default_protocol
= cfg
.protocol
= backends
[i
].protocol
;
588 default_port
= cfg
.port
=
589 backends
[i
].backend
->default_port
;
598 int ret
= cmdline_process_param(p
, (argc
> 1 ? argv
[1] : NULL
),
602 "plink: option \"%s\" requires an argument\n", p
);
604 } else if (ret
== 2) {
606 } else if (ret
== 1) {
608 } else if (!strcmp(p
, "-batch")) {
609 console_batch_mode
= 1;
610 } else if (!strcmp(p
, "-s")) {
611 /* Save status to write to cfg later. */
613 } else if (!strcmp(p
, "-V")) {
615 } else if (!strcmp(p
, "-pgpfp")) {
618 } else if (!strcmp(p
, "-o")) {
621 "plink: option \"-o\" requires an argument\n");
625 provide_xrm_string(*++argv
);
628 fprintf(stderr
, "plink: unknown option \"%s\"\n", p
);
632 if (!cfg_launchable(&cfg
)) {
636 * If the hostname starts with "telnet:", set the
637 * protocol to Telnet and process the string as a
640 if (!strncmp(q
, "telnet:", 7)) {
644 if (q
[0] == '/' && q
[1] == '/')
646 cfg
.protocol
= PROT_TELNET
;
648 while (*p
&& *p
!= ':' && *p
!= '/')
657 strncpy(cfg
.host
, q
, sizeof(cfg
.host
) - 1);
658 cfg
.host
[sizeof(cfg
.host
) - 1] = '\0';
660 char *r
, *user
, *host
;
662 * Before we process the [user@]host string, we
663 * first check for the presence of a protocol
664 * prefix (a protocol name followed by ",").
669 for (i
= 0; backends
[i
].backend
!= NULL
; i
++) {
670 j
= strlen(backends
[i
].name
);
672 !memcmp(backends
[i
].name
, p
, j
)) {
673 default_protocol
= cfg
.protocol
=
674 backends
[i
].protocol
;
676 backends
[i
].backend
->default_port
;
684 * A nonzero length string followed by an @ is treated
685 * as a username. (We discount an _initial_ @.) The
686 * rest of the string (or the whole string if no @)
687 * is treated as a session name and/or hostname.
691 p
++, r
= NULL
; /* discount initial @ */
696 user
= NULL
, host
= p
;
700 * Now attempt to load a saved session with the
701 * same name as the hostname.
705 do_defaults(host
, &cfg2
);
706 if (loaded_session
|| !cfg_launchable(&cfg2
)) {
707 /* No settings for this host; use defaults */
708 /* (or session was already loaded with -load) */
709 strncpy(cfg
.host
, host
, sizeof(cfg
.host
) - 1);
710 cfg
.host
[sizeof(cfg
.host
) - 1] = '\0';
711 cfg
.port
= default_port
;
718 /* Patch in specified username. */
719 strncpy(cfg
.username
, user
,
720 sizeof(cfg
.username
) - 1);
721 cfg
.username
[sizeof(cfg
.username
) - 1] = '\0';
728 cmdlen
= cmdsize
= 0;
733 if (cmdlen
>= cmdsize
) {
734 cmdsize
= cmdlen
+ 512;
735 command
= sresize(command
, cmdsize
, char);
737 command
[cmdlen
++]=*p
++;
739 if (cmdlen
>= cmdsize
) {
740 cmdsize
= cmdlen
+ 512;
741 command
= sresize(command
, cmdsize
, char);
743 command
[cmdlen
++]=' '; /* always add trailing space */
744 if (--argc
) p
= *++argv
;
746 if (cmdlen
) command
[--cmdlen
]='\0';
747 /* change trailing blank to NUL */
748 cfg
.remote_cmd_ptr
= command
;
749 cfg
.remote_cmd_ptr2
= NULL
;
750 cfg
.nopty
= TRUE
; /* command => no terminal */
752 break; /* done with cmdline */
760 if (!cfg_launchable(&cfg
)) {
765 * Trim leading whitespace off the hostname if it's there.
768 int space
= strspn(cfg
.host
, " \t");
769 memmove(cfg
.host
, cfg
.host
+space
, 1+strlen(cfg
.host
)-space
);
772 /* See if host is of the form user@host */
773 if (cfg
.host
[0] != '\0') {
774 char *atsign
= strrchr(cfg
.host
, '@');
775 /* Make sure we're not overflowing the user field */
777 if (atsign
- cfg
.host
< sizeof cfg
.username
) {
778 strncpy(cfg
.username
, cfg
.host
, atsign
- cfg
.host
);
779 cfg
.username
[atsign
- cfg
.host
] = '\0';
781 memmove(cfg
.host
, atsign
+ 1, 1 + strlen(atsign
+ 1));
786 * Perform command-line overrides on session configuration.
788 cmdline_run_saved(&cfg
);
791 * Apply subsystem status.
794 cfg
.ssh_subsys
= TRUE
;
797 * Trim a colon suffix off the hostname if it's there.
799 cfg
.host
[strcspn(cfg
.host
, ":")] = '\0';
802 * Remove any remaining whitespace from the hostname.
806 while (cfg
.host
[p2
] != '\0') {
807 if (cfg
.host
[p2
] != ' ' && cfg
.host
[p2
] != '\t') {
808 cfg
.host
[p1
] = cfg
.host
[p2
];
816 if (!cfg
.remote_cmd_ptr
&& !*cfg
.remote_cmd
&& !*cfg
.ssh_nc_host
)
817 flags
|= FLAG_INTERACTIVE
;
820 * Select protocol. This is farmed out into a table in a
821 * separate file to enable an ssh-free variant.
826 for (i
= 0; backends
[i
].backend
!= NULL
; i
++)
827 if (backends
[i
].protocol
== cfg
.protocol
) {
828 back
= backends
[i
].backend
;
833 "Internal fault: Unsupported protocol found\n");
841 if (portnumber
!= -1)
842 cfg
.port
= portnumber
;
845 * Set up the pipe we'll use to tell us about SIGWINCH.
847 if (pipe(signalpipe
) < 0) {
851 putty_signal(SIGWINCH
, sigwinch
);
857 * Start up the connection.
859 logctx
= log_init(NULL
, &cfg
);
860 console_provide_logctx(logctx
);
864 /* nodelay is only useful if stdin is a terminal device */
865 int nodelay
= cfg
.tcp_nodelay
&& isatty(0);
867 error
= back
->init(NULL
, &backhandle
, &cfg
, cfg
.host
, cfg
.port
,
868 &realhost
, nodelay
, cfg
.tcp_keepalives
);
870 fprintf(stderr
, "Unable to open connection:\n%s\n", error
);
873 back
->provide_logctx(backhandle
, logctx
);
874 ldisc
= ldisc_create(&cfg
, NULL
, back
, backhandle
, NULL
);
880 * Set up the initial console mode. We don't care if this call
881 * fails, because we know we aren't necessarily running in a
884 local_tty
= (tcgetattr(0, &orig_termios
) == 0);
885 atexit(cleanup_termios
);
886 ldisc_update(NULL
, 1, 1);
888 now
= GETTICKCOUNT();
891 fd_set rset
, wset
, xset
;
901 FD_SET_MAX(signalpipe
[0], maxfd
, rset
);
903 if (connopen
&& !sending
&&
904 back
->connected(backhandle
) &&
905 back
->sendok(backhandle
) &&
906 back
->sendbuffer(backhandle
) < MAX_STDIN_BACKLOG
) {
907 /* If we're OK to send, then try to read from stdin. */
908 FD_SET_MAX(0, maxfd
, rset
);
911 if (bufchain_size(&stdout_data
) > 0) {
912 /* If we have data for stdout, try to write to stdout. */
913 FD_SET_MAX(1, maxfd
, wset
);
916 if (bufchain_size(&stderr_data
) > 0) {
917 /* If we have data for stderr, try to write to stderr. */
918 FD_SET_MAX(2, maxfd
, wset
);
921 /* Count the currently active fds. */
923 for (fd
= first_fd(&fdstate
, &rwx
); fd
>= 0;
924 fd
= next_fd(&fdstate
, &rwx
)) i
++;
926 /* Expand the fdlist buffer if necessary. */
929 fdlist
= sresize(fdlist
, fdsize
, int);
933 * Add all currently open fds to the select sets, and store
934 * them in fdlist as well.
937 for (fd
= first_fd(&fdstate
, &rwx
); fd
>= 0;
938 fd
= next_fd(&fdstate
, &rwx
)) {
939 fdlist
[fdcount
++] = fd
;
941 FD_SET_MAX(fd
, maxfd
, rset
);
943 FD_SET_MAX(fd
, maxfd
, wset
);
945 FD_SET_MAX(fd
, maxfd
, xset
);
950 struct timeval tv
, *ptv
;
952 if (run_timers(now
, &next
)) {
953 ticks
= next
- GETTICKCOUNT();
954 if (ticks
< 0) ticks
= 0; /* just in case */
955 tv
.tv_sec
= ticks
/ 1000;
956 tv
.tv_usec
= ticks
% 1000 * 1000;
961 ret
= select(maxfd
, &rset
, &wset
, &xset
, ptv
);
965 long newnow
= GETTICKCOUNT();
967 * Check to see whether the system clock has
968 * changed massively during the select.
970 if (newnow
- now
< 0 || newnow
- now
> next
- now
) {
972 * If so, look at the elapsed time in the
973 * select and use it to compute a new
976 long othernow
= now
+ tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
977 /* So we'd like GETTICKCOUNT to have returned othernow,
978 * but instead it return newnow. Hence ... */
979 tickcount_offset
+= othernow
- newnow
;
985 } while (ret
< 0 && errno
== EINTR
);
992 for (i
= 0; i
< fdcount
; i
++) {
995 * We must process exceptional notifications before
996 * ordinary readability ones, or we may go straight
997 * past the urgent marker.
999 if (FD_ISSET(fd
, &xset
))
1000 select_result(fd
, 4);
1001 if (FD_ISSET(fd
, &rset
))
1002 select_result(fd
, 1);
1003 if (FD_ISSET(fd
, &wset
))
1004 select_result(fd
, 2);
1007 if (FD_ISSET(signalpipe
[0], &rset
)) {
1009 struct winsize size
;
1010 read(signalpipe
[0], c
, 1); /* ignore its value; it'll be `x' */
1011 if (ioctl(0, TIOCGWINSZ
, (void *)&size
) >= 0)
1012 back
->size(backhandle
, size
.ws_col
, size
.ws_row
);
1015 if (FD_ISSET(0, &rset
)) {
1019 if (connopen
&& back
->connected(backhandle
)) {
1020 ret
= read(0, buf
, sizeof(buf
));
1022 perror("stdin: read");
1024 } else if (ret
== 0) {
1025 back
->special(backhandle
, TS_EOF
);
1026 sending
= FALSE
; /* send nothing further after this */
1031 back
->send(backhandle
, buf
, ret
);
1036 if (FD_ISSET(1, &wset
)) {
1040 if (FD_ISSET(2, &wset
)) {
1044 if ((!connopen
|| !back
->connected(backhandle
)) &&
1045 bufchain_size(&stdout_data
) == 0 &&
1046 bufchain_size(&stderr_data
) == 0)
1047 break; /* we closed the connection */
1049 exitcode
= back
->exitcode(backhandle
);
1051 fprintf(stderr
, "Remote process exit code unavailable\n");
1052 exitcode
= 1; /* this is an error condition */
1054 cleanup_exit(exitcode
);
1055 return exitcode
; /* shouldn't happen, but placates gcc */