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 connection_fatal(void *frontend
, char *p
, ...)
71 fprintf(stderr
, "FATAL ERROR: ");
73 vfprintf(stderr
, p
, ap
);
83 void cmdline_error(char *p
, ...)
88 fprintf(stderr
, "plink: ");
90 vfprintf(stderr
, p
, ap
);
97 static int local_tty
= FALSE
; /* do we have a local tty? */
100 static void *backhandle
;
104 * Default settings that are specific to pterm.
106 char *platform_default_s(const char *name
)
108 if (!strcmp(name
, "TermType"))
109 return dupstr(getenv("TERM"));
110 if (!strcmp(name
, "UserName"))
111 return get_username();
112 if (!strcmp(name
, "SerialLine"))
113 return dupstr("/dev/ttyS0");
117 int platform_default_i(const char *name
, int def
)
119 if (!strcmp(name
, "TermWidth") ||
120 !strcmp(name
, "TermHeight")) {
122 if (ioctl(STDIN_FILENO
, TIOCGWINSZ
, (void *)&size
) >= 0)
123 return (!strcmp(name
, "TermWidth") ? size
.ws_col
: size
.ws_row
);
128 FontSpec
platform_default_fontspec(const char *name
)
135 Filename
platform_default_filename(const char *name
)
138 if (!strcmp(name
, "LogFileName"))
139 strcpy(ret
.path
, "putty.log");
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
)
205 return dupprintf("");
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
);
393 int sendlen
, ret
, fl
;
395 if (bufchain_size(chain
) > 0) {
396 fl
= fcntl(fd
, F_GETFL
);
397 if (fl
!= -1 && !(fl
& O_NONBLOCK
))
398 fcntl(fd
, F_SETFL
, fl
| O_NONBLOCK
);
400 bufchain_prefix(chain
, &senddata
, &sendlen
);
401 ret
= write(fd
, senddata
, sendlen
);
403 bufchain_consume(chain
, ret
);
404 } while (ret
== sendlen
&& bufchain_size(chain
) != 0);
405 if (fl
!= -1 && !(fl
& O_NONBLOCK
))
406 fcntl(fd
, F_SETFL
, fl
);
407 if (ret
< 0 && errno
!= EAGAIN
) {
408 perror(is_stderr ?
"stderr: write" : "stdout: write");
412 if (outgoingeof
== EOF_PENDING
&& bufchain_size(&stdout_data
) == 0) {
413 close(STDOUT_FILENO
);
414 outgoingeof
= EOF_SENT
;
416 return bufchain_size(&stdout_data
) + bufchain_size(&stderr_data
);
419 int from_backend(void *frontend_handle
, int is_stderr
,
420 const char *data
, int len
)
423 bufchain_add(&stderr_data
, data
, len
);
424 return try_output(TRUE
);
426 assert(outgoingeof
== EOF_NO
);
427 bufchain_add(&stdout_data
, data
, len
);
428 return try_output(FALSE
);
432 int from_backend_untrusted(void *frontend_handle
, const char *data
, int len
)
435 * No "untrusted" output should get here (the way the code is
436 * currently, it's all diverted by FLAG_STDERR).
438 assert(!"Unexpected call to from_backend_untrusted()");
439 return 0; /* not reached */
442 int from_backend_eof(void *frontend_handle
)
444 assert(outgoingeof
== EOF_NO
);
445 outgoingeof
= EOF_PENDING
;
447 return FALSE
; /* do not respond to incoming EOF with outgoing */
450 int get_userpass_input(prompts_t
*p
, unsigned char *in
, int inlen
)
453 ret
= cmdline_get_passwd_input(p
, in
, inlen
);
455 ret
= console_get_userpass_input(p
, in
, inlen
);
460 * Handle data from a local tty in PARMRK format.
462 static void from_tty(void *vbuf
, unsigned len
)
464 char *p
, *q
, *end
, *buf
= vbuf
;
465 static enum {NORMAL
, FF
, FF00
} state
= NORMAL
;
467 p
= buf
; end
= buf
+ len
;
475 q
= memchr(p
, '\xff', end
- p
);
476 if (q
== NULL
) q
= end
;
477 back
->send(backhandle
, p
, q
- p
);
483 back
->send(backhandle
, p
, 1);
486 } else if (*p
== '\0') {
493 back
->special(backhandle
, TS_BRK
);
496 * Pretend that PARMRK wasn't set. This involves
497 * faking what INPCK and IGNPAR would have done if
498 * we hadn't overridden them. Unfortunately, we
499 * can't do this entirely correctly because INPCK
500 * distinguishes between framing and parity
501 * errors, but PARMRK format represents both in
502 * the same way. We assume that parity errors are
503 * more common than framing errors, and hence
504 * treat all input errors as being subject to
507 if (orig_termios
.c_iflag
& INPCK
) {
508 /* If IGNPAR is set, we throw away the character. */
509 if (!(orig_termios
.c_iflag
& IGNPAR
)) {
510 /* PE/FE get passed on as NUL. */
512 back
->send(backhandle
, p
, 1);
515 /* INPCK not set. Assume we got a parity error. */
516 back
->send(backhandle
, p
, 1);
527 void sigwinch(int signum
)
529 if (write(signalpipe
[1], "x", 1) <= 0)
530 /* not much we can do about it */;
534 * In Plink our selects are synchronous, so these functions are
537 int uxsel_input_add(int fd
, int rwx
) { return 0; }
538 void uxsel_input_remove(int id
) { }
541 * Short description of parameters.
543 static void usage(void)
545 printf("PuTTY Link: command-line connection utility\n");
547 printf("Usage: plink [options] [user@]host [command]\n");
548 printf(" (\"host\" can also be a PuTTY saved session name)\n");
549 printf("Options:\n");
550 printf(" -V print version information and exit\n");
551 printf(" -pgpfp print PGP key fingerprints and exit\n");
552 printf(" -v show verbose messages\n");
553 printf(" -load sessname Load settings from saved session\n");
554 printf(" -ssh -telnet -rlogin -raw -serial\n");
555 printf(" force use of a particular protocol\n");
556 printf(" -P port connect to specified port\n");
557 printf(" -l user connect with specified username\n");
558 printf(" -batch disable all interactive prompts\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 authentication\n");
574 printf(" -noagent disable use of Pageant\n");
575 printf(" -agent enable use of Pageant\n");
576 printf(" -m file read remote command(s) from file\n");
577 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
578 printf(" -N don't start a shell/command (SSH-2 only)\n");
579 printf(" -nc host:port\n");
580 printf(" open tunnel in place of session (SSH-2 only)\n");
581 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
582 printf(" Specify the serial configuration (serial only)\n");
586 static void version(void)
588 printf("plink: %s\n", ver
);
592 int main(int argc
, char **argv
)
598 int i
, fdcount
, fdsize
, fdstate
;
602 int use_subsystem
= 0;
603 int got_host
= FALSE
;
607 fdcount
= fdsize
= 0;
609 * Initialise port and protocol to sensible defaults. (These
610 * will be overridden by more or less anything.)
612 default_protocol
= PROT_SSH
;
615 bufchain_init(&stdout_data
);
616 bufchain_init(&stderr_data
);
617 outgoingeof
= EOF_NO
;
619 flags
= FLAG_STDERR
| FLAG_STDERR_TTY
;
623 * Process the command line.
626 do_defaults(NULL
, conf
);
627 loaded_session
= FALSE
;
628 default_protocol
= conf_get_int(conf
, CONF_protocol
);
629 default_port
= conf_get_int(conf
, CONF_port
);
633 * Override the default protocol if PLINK_PROTOCOL is set.
635 char *p
= getenv("PLINK_PROTOCOL");
637 const Backend
*b
= backend_from_name(p
);
639 default_protocol
= b
->protocol
;
640 default_port
= b
->default_port
;
641 conf_set_int(conf
, CONF_protocol
, default_protocol
);
642 conf_set_int(conf
, CONF_port
, default_port
);
649 int ret
= cmdline_process_param(p
, (argc
> 1 ? argv
[1] : NULL
),
653 "plink: option \"%s\" requires an argument\n", p
);
655 } else if (ret
== 2) {
657 } else if (ret
== 1) {
659 } else if (!strcmp(p
, "-batch")) {
660 console_batch_mode
= 1;
661 } else if (!strcmp(p
, "-s")) {
662 /* Save status to write to conf later. */
664 } else if (!strcmp(p
, "-V")) {
666 } else if (!strcmp(p
, "-pgpfp")) {
669 } else if (!strcmp(p
, "-o")) {
672 "plink: option \"-o\" requires an argument\n");
676 provide_xrm_string(*++argv
);
679 fprintf(stderr
, "plink: unknown option \"%s\"\n", p
);
683 if (!conf_launchable(conf
) || !(got_host
|| loaded_session
)) {
687 * If the hostname starts with "telnet:", set the
688 * protocol to Telnet and process the string as a
691 if (!strncmp(q
, "telnet:", 7)) {
695 if (q
[0] == '/' && q
[1] == '/')
697 conf_set_int(conf
, CONF_protocol
, PROT_TELNET
);
699 while (*p
&& *p
!= ':' && *p
!= '/')
705 conf_set_int(conf
, CONF_port
, atoi(p
));
707 conf_set_int(conf
, CONF_port
, -1);
708 conf_set_str(conf
, CONF_host
, q
);
711 char *r
, *user
, *host
;
713 * Before we process the [user@]host string, we
714 * first check for the presence of a protocol
715 * prefix (a protocol name followed by ",").
721 b
= backend_from_name(p
);
723 default_protocol
= b
->protocol
;
724 conf_set_int(conf
, CONF_protocol
,
726 portnumber
= b
->default_port
;
732 * A nonzero length string followed by an @ is treated
733 * as a username. (We discount an _initial_ @.) The
734 * rest of the string (or the whole string if no @)
735 * is treated as a session name and/or hostname.
739 p
++, r
= NULL
; /* discount initial @ */
744 user
= NULL
, host
= p
;
748 * Now attempt to load a saved session with the
749 * same name as the hostname.
752 Conf
*conf2
= conf_new();
753 do_defaults(host
, conf2
);
754 if (loaded_session
|| !conf_launchable(conf2
)) {
755 /* No settings for this host; use defaults */
756 /* (or session was already loaded with -load) */
757 conf_set_str(conf
, CONF_host
, host
);
758 conf_set_int(conf
, CONF_port
, default_port
);
761 conf_copy_into(conf
, conf2
);
762 loaded_session
= TRUE
;
768 /* Patch in specified username. */
769 conf_set_str(conf
, CONF_username
, user
);
776 cmdlen
= cmdsize
= 0;
781 if (cmdlen
>= cmdsize
) {
782 cmdsize
= cmdlen
+ 512;
783 command
= sresize(command
, cmdsize
, char);
785 command
[cmdlen
++]=*p
++;
787 if (cmdlen
>= cmdsize
) {
788 cmdsize
= cmdlen
+ 512;
789 command
= sresize(command
, cmdsize
, char);
791 command
[cmdlen
++]=' '; /* always add trailing space */
792 if (--argc
) p
= *++argv
;
794 if (cmdlen
) command
[--cmdlen
]='\0';
795 /* change trailing blank to NUL */
796 conf_set_str(conf
, CONF_remote_cmd
, command
);
797 conf_set_str(conf
, CONF_remote_cmd2
, "");
798 conf_set_int(conf
, CONF_nopty
, TRUE
); /* command => no tty */
800 break; /* done with cmdline */
808 if (!conf_launchable(conf
) || !(got_host
|| loaded_session
)) {
813 * Muck about with the hostname in various ways.
816 char *hostbuf
= dupstr(conf_get_str(conf
, CONF_host
));
817 char *host
= hostbuf
;
821 * Trim leading whitespace.
823 host
+= strspn(host
, " \t");
826 * See if host is of the form user@host, and separate out
827 * the username if so.
829 if (host
[0] != '\0') {
830 char *atsign
= strrchr(host
, '@');
833 conf_set_str(conf
, CONF_username
, host
);
839 * Trim off a colon suffix if it's there.
841 host
[strcspn(host
, ":")] = '\0';
844 * Remove any remaining whitespace.
849 if (*q
!= ' ' && *q
!= '\t')
855 conf_set_str(conf
, CONF_host
, hostbuf
);
860 * Perform command-line overrides on session configuration.
862 cmdline_run_saved(conf
);
865 * Apply subsystem status.
868 conf_set_int(conf
, CONF_ssh_subsys
, TRUE
);
870 if (!*conf_get_str(conf
, CONF_remote_cmd
) &&
871 !*conf_get_str(conf
, CONF_remote_cmd2
) &&
872 !*conf_get_str(conf
, CONF_ssh_nc_host
))
873 flags
|= FLAG_INTERACTIVE
;
876 * Select protocol. This is farmed out into a table in a
877 * separate file to enable an ssh-free variant.
879 back
= backend_from_proto(conf_get_int(conf
, CONF_protocol
));
882 "Internal fault: Unsupported protocol found\n");
889 if (portnumber
!= -1)
890 conf_set_int(conf
, CONF_port
, portnumber
);
893 * Set up the pipe we'll use to tell us about SIGWINCH.
895 if (pipe(signalpipe
) < 0) {
899 putty_signal(SIGWINCH
, sigwinch
);
905 * Unix Plink doesn't provide any way to add forwardings after the
906 * connection is set up, so if there are none now, we can safely set
909 if (conf_get_int(conf
, CONF_protocol
) == PROT_SSH
&&
910 !conf_get_int(conf
, CONF_x11_forward
) &&
911 !conf_get_int(conf
, CONF_agentfwd
) &&
912 !conf_get_str_nthstrkey(conf
, CONF_portfwd
, 0))
913 conf_set_int(conf
, CONF_ssh_simple
, TRUE
);
916 * Start up the connection.
918 logctx
= log_init(NULL
, conf
);
919 console_provide_logctx(logctx
);
923 /* nodelay is only useful if stdin is a terminal device */
924 int nodelay
= conf_get_int(conf
, CONF_tcp_nodelay
) && isatty(0);
926 error
= back
->init(NULL
, &backhandle
, conf
,
927 conf_get_str(conf
, CONF_host
),
928 conf_get_int(conf
, CONF_port
),
930 conf_get_int(conf
, CONF_tcp_keepalives
));
932 fprintf(stderr
, "Unable to open connection:\n%s\n", error
);
935 back
->provide_logctx(backhandle
, logctx
);
936 ldisc_create(conf
, NULL
, back
, backhandle
, NULL
);
942 * Set up the initial console mode. We don't care if this call
943 * fails, because we know we aren't necessarily running in a
946 local_tty
= (tcgetattr(STDIN_FILENO
, &orig_termios
) == 0);
947 atexit(cleanup_termios
);
948 ldisc_update(NULL
, 1, 1);
950 now
= GETTICKCOUNT();
953 fd_set rset
, wset
, xset
;
963 FD_SET_MAX(signalpipe
[0], maxfd
, rset
);
965 if (connopen
&& !sending
&&
966 back
->connected(backhandle
) &&
967 back
->sendok(backhandle
) &&
968 back
->sendbuffer(backhandle
) < MAX_STDIN_BACKLOG
) {
969 /* If we're OK to send, then try to read from stdin. */
970 FD_SET_MAX(STDIN_FILENO
, maxfd
, rset
);
973 if (bufchain_size(&stdout_data
) > 0) {
974 /* If we have data for stdout, try to write to stdout. */
975 FD_SET_MAX(STDOUT_FILENO
, maxfd
, wset
);
978 if (bufchain_size(&stderr_data
) > 0) {
979 /* If we have data for stderr, try to write to stderr. */
980 FD_SET_MAX(STDERR_FILENO
, maxfd
, wset
);
983 /* Count the currently active fds. */
985 for (fd
= first_fd(&fdstate
, &rwx
); fd
>= 0;
986 fd
= next_fd(&fdstate
, &rwx
)) i
++;
988 /* Expand the fdlist buffer if necessary. */
991 fdlist
= sresize(fdlist
, fdsize
, int);
995 * Add all currently open fds to the select sets, and store
996 * them in fdlist as well.
999 for (fd
= first_fd(&fdstate
, &rwx
); fd
>= 0;
1000 fd
= next_fd(&fdstate
, &rwx
)) {
1001 fdlist
[fdcount
++] = fd
;
1003 FD_SET_MAX(fd
, maxfd
, rset
);
1005 FD_SET_MAX(fd
, maxfd
, wset
);
1007 FD_SET_MAX(fd
, maxfd
, xset
);
1012 struct timeval tv
, *ptv
;
1014 if (run_timers(now
, &next
)) {
1015 ticks
= next
- GETTICKCOUNT();
1016 if (ticks
< 0) ticks
= 0; /* just in case */
1017 tv
.tv_sec
= ticks
/ 1000;
1018 tv
.tv_usec
= ticks
% 1000 * 1000;
1023 ret
= select(maxfd
, &rset
, &wset
, &xset
, ptv
);
1027 long newnow
= GETTICKCOUNT();
1029 * Check to see whether the system clock has
1030 * changed massively during the select.
1032 if (newnow
- now
< 0 || newnow
- now
> next
- now
) {
1034 * If so, look at the elapsed time in the
1035 * select and use it to compute a new
1038 long othernow
= now
+ tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
1039 /* So we'd like GETTICKCOUNT to have returned othernow,
1040 * but instead it return newnow. Hence ... */
1041 tickcount_offset
+= othernow
- newnow
;
1047 } while (ret
< 0 && errno
== EINTR
);
1054 for (i
= 0; i
< fdcount
; i
++) {
1057 * We must process exceptional notifications before
1058 * ordinary readability ones, or we may go straight
1059 * past the urgent marker.
1061 if (FD_ISSET(fd
, &xset
))
1062 select_result(fd
, 4);
1063 if (FD_ISSET(fd
, &rset
))
1064 select_result(fd
, 1);
1065 if (FD_ISSET(fd
, &wset
))
1066 select_result(fd
, 2);
1069 if (FD_ISSET(signalpipe
[0], &rset
)) {
1071 struct winsize size
;
1072 if (read(signalpipe
[0], c
, 1) <= 0)
1074 /* ignore its value; it'll be `x' */
1075 if (ioctl(0, TIOCGWINSZ
, (void *)&size
) >= 0)
1076 back
->size(backhandle
, size
.ws_col
, size
.ws_row
);
1079 if (FD_ISSET(STDIN_FILENO
, &rset
)) {
1083 if (connopen
&& back
->connected(backhandle
)) {
1084 ret
= read(STDIN_FILENO
, buf
, sizeof(buf
));
1086 perror("stdin: read");
1088 } else if (ret
== 0) {
1089 back
->special(backhandle
, TS_EOF
);
1090 sending
= FALSE
; /* send nothing further after this */
1095 back
->send(backhandle
, buf
, ret
);
1100 if (FD_ISSET(STDOUT_FILENO
, &wset
)) {
1101 back
->unthrottle(backhandle
, try_output(FALSE
));
1104 if (FD_ISSET(STDERR_FILENO
, &wset
)) {
1105 back
->unthrottle(backhandle
, try_output(TRUE
));
1108 if ((!connopen
|| !back
->connected(backhandle
)) &&
1109 bufchain_size(&stdout_data
) == 0 &&
1110 bufchain_size(&stderr_data
) == 0)
1111 break; /* we closed the connection */
1113 exitcode
= back
->exitcode(backhandle
);
1115 fprintf(stderr
, "Remote process exit code unavailable\n");
1116 exitcode
= 1; /* this is an error condition */
1118 cleanup_exit(exitcode
);
1119 return exitcode
; /* shouldn't happen, but placates gcc */