1 /* Serial interface for local (hardwired) serial ports on Un*x like systems
3 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
4 2003, 2004 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
28 #include <sys/types.h>
30 #include <sys/socket.h>
33 #include "gdb_string.h"
34 #include "event-loop.h"
38 struct hardwire_ttystate
40 struct termios termios;
46 /* It is believed that all systems which have added job control to SVR3
47 (e.g. sco) have also added termios. Even if not, trying to figure out
48 all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
49 bewildering. So we don't attempt it. */
51 struct hardwire_ttystate
58 struct hardwire_ttystate
63 /* Line discipline flags. */
68 static int hardwire_open (struct serial *scb, const char *name);
69 static void hardwire_raw (struct serial *scb);
70 static int wait_for (struct serial *scb, int timeout);
71 static int hardwire_readchar (struct serial *scb, int timeout);
72 static int do_hardwire_readchar (struct serial *scb, int timeout);
73 static int generic_readchar (struct serial *scb, int timeout,
74 int (*do_readchar) (struct serial *scb,
76 static int rate_to_code (int rate);
77 static int hardwire_setbaudrate (struct serial *scb, int rate);
78 static void hardwire_close (struct serial *scb);
79 static int get_tty_state (struct serial *scb,
80 struct hardwire_ttystate * state);
81 static int set_tty_state (struct serial *scb,
82 struct hardwire_ttystate * state);
83 static serial_ttystate hardwire_get_tty_state (struct serial *scb);
84 static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);
85 static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,
87 static void hardwire_print_tty_state (struct serial *, serial_ttystate,
89 static int hardwire_drain_output (struct serial *);
90 static int hardwire_flush_output (struct serial *);
91 static int hardwire_flush_input (struct serial *);
92 static int hardwire_send_break (struct serial *);
93 static int hardwire_setstopbits (struct serial *, int);
95 static int do_unix_readchar (struct serial *scb, int timeout);
96 static timer_handler_func push_event;
97 static handler_func fd_event;
98 static void reschedule (struct serial *scb);
100 void _initialize_ser_hardwire (void);
102 /* Open up a real live device for serial I/O */
105 hardwire_open (struct serial *scb, const char *name)
107 scb->fd = open (name, O_RDWR);
115 get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
118 if (tcgetattr (scb->fd, &state->termios) < 0)
125 if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
131 if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
133 if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
135 if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
137 if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
145 set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
148 if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
155 if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
161 if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
163 if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
165 if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
167 if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
174 static serial_ttystate
175 hardwire_get_tty_state (struct serial *scb)
177 struct hardwire_ttystate *state;
179 state = (struct hardwire_ttystate *) xmalloc (sizeof *state);
181 if (get_tty_state (scb, state))
184 return (serial_ttystate) state;
188 hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
190 struct hardwire_ttystate *state;
192 state = (struct hardwire_ttystate *) ttystate;
194 return set_tty_state (scb, state);
198 hardwire_noflush_set_tty_state (struct serial *scb,
199 serial_ttystate new_ttystate,
200 serial_ttystate old_ttystate)
202 struct hardwire_ttystate new_state;
204 struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
207 new_state = *(struct hardwire_ttystate *) new_ttystate;
209 /* Don't change in or out of raw mode; we don't want to flush input.
210 termio and termios have no such restriction; for them flushing input
211 is separate from setting the attributes. */
214 if (state->sgttyb.sg_flags & RAW)
215 new_state.sgttyb.sg_flags |= RAW;
217 new_state.sgttyb.sg_flags &= ~RAW;
219 /* I'm not sure whether this is necessary; the manpage just mentions
221 if (state->sgttyb.sg_flags & CBREAK)
222 new_state.sgttyb.sg_flags |= CBREAK;
224 new_state.sgttyb.sg_flags &= ~CBREAK;
227 return set_tty_state (scb, &new_state);
231 hardwire_print_tty_state (struct serial *scb,
232 serial_ttystate ttystate,
233 struct ui_file *stream)
235 struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
239 fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
240 (int) state->termios.c_iflag,
241 (int) state->termios.c_oflag);
242 fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
243 (int) state->termios.c_cflag,
244 (int) state->termios.c_lflag);
246 /* This not in POSIX, and is not really documented by those systems
247 which have it (at least not Sun). */
248 fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
250 fprintf_filtered (stream, "c_cc: ");
251 for (i = 0; i < NCCS; i += 1)
252 fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
253 fprintf_filtered (stream, "\n");
257 fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
258 state->termio.c_iflag, state->termio.c_oflag);
259 fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
260 state->termio.c_cflag, state->termio.c_lflag,
261 state->termio.c_line);
262 fprintf_filtered (stream, "c_cc: ");
263 for (i = 0; i < NCC; i += 1)
264 fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
265 fprintf_filtered (stream, "\n");
269 fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
270 state->sgttyb.sg_flags);
272 fprintf_filtered (stream, "tchars: ");
273 for (i = 0; i < (int) sizeof (struct tchars); i++)
274 fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
275 fprintf_filtered (stream, "\n");
277 fprintf_filtered (stream, "ltchars: ");
278 for (i = 0; i < (int) sizeof (struct ltchars); i++)
279 fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
280 fprintf_filtered (stream, "\n");
282 fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode);
286 /* Wait for the output to drain away, as opposed to flushing (discarding) it */
289 hardwire_drain_output (struct serial *scb)
292 return tcdrain (scb->fd);
296 return ioctl (scb->fd, TCSBRK, 1);
300 /* Get the current state and then restore it using TIOCSETP,
301 which should cause the output to drain and pending input
304 struct hardwire_ttystate state;
305 if (get_tty_state (scb, &state))
311 return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
318 hardwire_flush_output (struct serial *scb)
321 return tcflush (scb->fd, TCOFLUSH);
325 return ioctl (scb->fd, TCFLSH, 1);
329 /* This flushes both input and output, but we can't do better. */
330 return ioctl (scb->fd, TIOCFLUSH, 0);
335 hardwire_flush_input (struct serial *scb)
337 ser_unix_flush_input (scb);
340 return tcflush (scb->fd, TCIFLUSH);
344 return ioctl (scb->fd, TCFLSH, 0);
348 /* This flushes both input and output, but we can't do better. */
349 return ioctl (scb->fd, TIOCFLUSH, 0);
354 hardwire_send_break (struct serial *scb)
357 return tcsendbreak (scb->fd, 0);
361 return ioctl (scb->fd, TCSBRK, 0);
367 struct timeval timeout;
369 status = ioctl (scb->fd, TIOCSBRK, 0);
371 /* Can't use usleep; it doesn't exist in BSD 4.2. */
372 /* Note that if this select() is interrupted by a signal it will not wait
373 the full length of time. I think that is OK. */
375 timeout.tv_usec = 250000;
376 select (0, 0, 0, 0, &timeout);
377 status = ioctl (scb->fd, TIOCCBRK, 0);
384 hardwire_raw (struct serial *scb)
386 struct hardwire_ttystate state;
388 if (get_tty_state (scb, &state))
389 fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
392 state.termios.c_iflag = 0;
393 state.termios.c_oflag = 0;
394 state.termios.c_lflag = 0;
395 state.termios.c_cflag &= ~(CSIZE | PARENB);
396 state.termios.c_cflag |= CLOCAL | CS8;
397 state.termios.c_cc[VMIN] = 0;
398 state.termios.c_cc[VTIME] = 0;
402 state.termio.c_iflag = 0;
403 state.termio.c_oflag = 0;
404 state.termio.c_lflag = 0;
405 state.termio.c_cflag &= ~(CSIZE | PARENB);
406 state.termio.c_cflag |= CLOCAL | CS8;
407 state.termio.c_cc[VMIN] = 0;
408 state.termio.c_cc[VTIME] = 0;
412 state.sgttyb.sg_flags |= RAW | ANYP;
413 state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
416 scb->current_timeout = 0;
418 if (set_tty_state (scb, &state))
419 fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
422 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
423 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
425 For termio{s}, we actually just setup VTIME if necessary, and let the
426 timeout occur in the read() in hardwire_read().
429 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
430 ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
433 /* NOTE: cagney/1999-09-30: Much of the code below is dead. The only
434 possible values of the TIMEOUT parameter are ONE and ZERO.
435 Consequently all the code that tries to handle the possability of
436 an overflowed timer is unnecessary. */
439 wait_for (struct serial *scb, int timeout)
448 /* NOTE: Some OS's can scramble the READFDS when the select()
449 call fails (ex the kernel with Red Hat 5.2). Initialize all
450 arguments before each call. */
456 FD_SET (scb->fd, &readfds);
459 numfds = select (scb->fd + 1, &readfds, 0, 0, &tv);
461 numfds = select (scb->fd + 1, &readfds, 0, 0, 0);
465 return SERIAL_TIMEOUT;
466 else if (errno == EINTR)
469 return SERIAL_ERROR; /* Got an error from select or poll */
473 #endif /* HAVE_SGTTY */
475 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
476 if (timeout == scb->current_timeout)
479 scb->current_timeout = timeout;
482 struct hardwire_ttystate state;
484 if (get_tty_state (scb, &state))
485 fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
491 state.termios.c_cc[VTIME] = 0;
492 state.termios.c_cc[VMIN] = 1;
496 state.termios.c_cc[VMIN] = 0;
497 state.termios.c_cc[VTIME] = timeout * 10;
498 if (state.termios.c_cc[VTIME] != timeout * 10)
501 /* If c_cc is an 8-bit signed character, we can't go
502 bigger than this. If it is always unsigned, we could use
505 scb->current_timeout = 12;
506 state.termios.c_cc[VTIME] = scb->current_timeout * 10;
507 scb->timeout_remaining = timeout - scb->current_timeout;
516 state.termio.c_cc[VTIME] = 0;
517 state.termio.c_cc[VMIN] = 1;
521 state.termio.c_cc[VMIN] = 0;
522 state.termio.c_cc[VTIME] = timeout * 10;
523 if (state.termio.c_cc[VTIME] != timeout * 10)
525 /* If c_cc is an 8-bit signed character, we can't go
526 bigger than this. If it is always unsigned, we could use
529 scb->current_timeout = 12;
530 state.termio.c_cc[VTIME] = scb->current_timeout * 10;
531 scb->timeout_remaining = timeout - scb->current_timeout;
536 if (set_tty_state (scb, &state))
537 fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
541 #endif /* HAVE_TERMIO || HAVE_TERMIOS */
544 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
545 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
546 char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line
547 dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */
549 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
550 ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
553 /* NOTE: cagney/1999-09-16: This function is not identical to
554 ser_unix_readchar() as part of replacing it with ser_unix*()
555 merging will be required - this code handles the case where read()
556 times out due to no data while ser_unix_readchar() doesn't expect
560 do_hardwire_readchar (struct serial *scb, int timeout)
568 /* We have to be able to keep the GUI alive here, so we break the
569 original timeout into steps of 1 second, running the "keep the
570 GUI alive" hook each time through the loop.
572 Also, timeout = 0 means to poll, so we just set the delta to 0,
573 so we will only go through the loop once. */
575 delta = (timeout == 0 ? 0 : 1);
579 /* N.B. The UI may destroy our world (for instance by calling
580 remote_stop,) in which case we want to get out of here as
581 quickly as possible. It is not safe to touch scb, since
582 someone else might have freed it. The
583 deprecated_ui_loop_hook signals that we should exit by
586 if (deprecated_ui_loop_hook)
587 detach = deprecated_ui_loop_hook (0);
590 return SERIAL_TIMEOUT;
592 scb->timeout_remaining = (timeout < 0 ? timeout : timeout - delta);
593 status = wait_for (scb, delta);
598 status = read (scb->fd, scb->buf, BUFSIZ);
604 /* Zero characters means timeout (it could also be EOF, but
605 we don't (yet at least) distinguish). */
606 if (scb->timeout_remaining > 0)
608 timeout = scb->timeout_remaining;
611 else if (scb->timeout_remaining < 0)
614 return SERIAL_TIMEOUT;
616 else if (errno == EINTR)
619 return SERIAL_ERROR; /* Got an error from read */
622 scb->bufcnt = status;
624 scb->bufp = scb->buf;
630 hardwire_readchar (struct serial *scb, int timeout)
632 return generic_readchar (scb, timeout, do_hardwire_readchar);
644 /* Translate baud rates from integers to damn B_codes. Unix should
645 have outgrown this crap years ago, but even POSIX wouldn't buck it. */
745 rate_to_code (int rate)
749 for (i = 0; baudtab[i].rate != -1; i++)
751 /* test for perfect macth. */
752 if (rate == baudtab[i].rate)
753 return baudtab[i].code;
756 /* check if it is in between valid values. */
757 if (rate < baudtab[i].rate)
761 warning (_("Invalid baud rate %d. Closest values are %d and %d."),
762 rate, baudtab[i - 1].rate, baudtab[i].rate);
766 warning (_("Invalid baud rate %d. Minimum value is %d."),
767 rate, baudtab[0].rate);
774 /* The requested speed was too large. */
775 warning (_("Invalid baud rate %d. Maximum value is %d."),
776 rate, baudtab[i - 1].rate);
781 hardwire_setbaudrate (struct serial *scb, int rate)
783 struct hardwire_ttystate state;
784 int baud_code = rate_to_code (rate);
788 /* The baud rate was not valid.
789 A warning has already been issued. */
794 if (get_tty_state (scb, &state))
798 cfsetospeed (&state.termios, baud_code);
799 cfsetispeed (&state.termios, baud_code);
807 state.termio.c_cflag &= ~(CBAUD | CIBAUD);
808 state.termio.c_cflag |= baud_code;
812 state.sgttyb.sg_ispeed = baud_code;
813 state.sgttyb.sg_ospeed = baud_code;
816 return set_tty_state (scb, &state);
820 hardwire_setstopbits (struct serial *scb, int num)
822 struct hardwire_ttystate state;
825 if (get_tty_state (scb, &state))
830 case SERIAL_1_STOPBITS:
833 case SERIAL_1_AND_A_HALF_STOPBITS:
834 case SERIAL_2_STOPBITS:
843 state.termios.c_cflag &= ~CSTOPB;
845 state.termios.c_cflag |= CSTOPB; /* two bits */
850 state.termio.c_cflag &= ~CSTOPB;
852 state.termio.c_cflag |= CSTOPB; /* two bits */
856 return 0; /* sgtty doesn't support this */
859 return set_tty_state (scb, &state);
863 hardwire_close (struct serial *scb)
873 /* Generic operations used by all UNIX/FD based serial interfaces. */
876 ser_unix_nop_get_tty_state (struct serial *scb)
878 /* allocate a dummy */
879 return (serial_ttystate) XMALLOC (int);
883 ser_unix_nop_set_tty_state (struct serial *scb, serial_ttystate ttystate)
889 ser_unix_nop_raw (struct serial *scb)
891 return; /* Always in raw mode */
894 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
895 otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */
898 ser_unix_wait_for (struct serial *scb, int timeout)
904 fd_set readfds, exceptfds;
906 /* NOTE: Some OS's can scramble the READFDS when the select()
907 call fails (ex the kernel with Red Hat 5.2). Initialize all
908 arguments before each call. */
914 FD_ZERO (&exceptfds);
915 FD_SET (scb->fd, &readfds);
916 FD_SET (scb->fd, &exceptfds);
919 numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
921 numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
926 return SERIAL_TIMEOUT;
927 else if (errno == EINTR)
930 return SERIAL_ERROR; /* Got an error from select or poll */
937 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
938 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
939 char if successful. Returns -2 if timeout expired, EOF if line dropped
940 dead, or -3 for any other error (see errno in that case). */
943 do_unix_readchar (struct serial *scb, int timeout)
948 /* We have to be able to keep the GUI alive here, so we break the
949 original timeout into steps of 1 second, running the "keep the
950 GUI alive" hook each time through the loop.
952 Also, timeout = 0 means to poll, so we just set the delta to 0,
953 so we will only go through the loop once. */
955 delta = (timeout == 0 ? 0 : 1);
959 /* N.B. The UI may destroy our world (for instance by calling
960 remote_stop,) in which case we want to get out of here as
961 quickly as possible. It is not safe to touch scb, since
962 someone else might have freed it. The
963 deprecated_ui_loop_hook signals that we should exit by
966 if (deprecated_ui_loop_hook)
968 if (deprecated_ui_loop_hook (0))
969 return SERIAL_TIMEOUT;
972 status = ser_unix_wait_for (scb, delta);
976 /* If we got a character or an error back from wait_for, then we can
977 break from the loop before the timeout is completed. */
979 if (status != SERIAL_TIMEOUT)
984 /* If we have exhausted the original timeout, then generate
985 a SERIAL_TIMEOUT, and pass it out of the loop. */
987 else if (timeout == 0)
989 status = SERIAL_TIMEOUT;
999 status = read (scb->fd, scb->buf, BUFSIZ);
1000 if (status != -1 || errno != EINTR)
1007 return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
1008 distinguish between EOF & timeouts
1011 return SERIAL_ERROR; /* Got an error from read */
1014 scb->bufcnt = status;
1016 scb->bufp = scb->buf;
1017 return *scb->bufp++;
1020 /* Perform operations common to both old and new readchar. */
1022 /* Return the next character from the input FIFO. If the FIFO is
1023 empty, call the SERIAL specific routine to try and read in more
1026 Initially data from the input FIFO is returned (fd_event()
1027 pre-reads the input into that FIFO. Once that has been emptied,
1028 further data is obtained by polling the input FD using the device
1029 specific readchar() function. Note: reschedule() is called after
1030 every read. This is because there is no guarentee that the lower
1031 level fd_event() poll_event() code (which also calls reschedule())
1035 generic_readchar (struct serial *scb, int timeout,
1036 int (do_readchar) (struct serial *scb, int timeout))
1039 if (scb->bufcnt > 0)
1045 else if (scb->bufcnt < 0)
1047 /* Some errors/eof are are sticky. */
1052 ch = do_readchar (scb, timeout);
1055 switch ((enum serial_rc) ch)
1059 /* Make the error/eof stick. */
1062 case SERIAL_TIMEOUT:
1073 ser_unix_readchar (struct serial *scb, int timeout)
1075 return generic_readchar (scb, timeout, do_unix_readchar);
1079 ser_unix_nop_noflush_set_tty_state (struct serial *scb,
1080 serial_ttystate new_ttystate,
1081 serial_ttystate old_ttystate)
1087 ser_unix_nop_print_tty_state (struct serial *scb,
1088 serial_ttystate ttystate,
1089 struct ui_file *stream)
1091 /* Nothing to print. */
1096 ser_unix_nop_setbaudrate (struct serial *scb, int rate)
1098 return 0; /* Never fails! */
1102 ser_unix_nop_setstopbits (struct serial *scb, int num)
1104 return 0; /* Never fails! */
1108 ser_unix_write (struct serial *scb, const char *str, int len)
1114 cc = write (scb->fd, str, len);
1125 ser_unix_nop_flush_output (struct serial *scb)
1131 ser_unix_flush_input (struct serial *scb)
1133 if (scb->bufcnt >= 0)
1136 scb->bufp = scb->buf;
1140 return SERIAL_ERROR;
1144 ser_unix_nop_send_break (struct serial *scb)
1150 ser_unix_nop_drain_output (struct serial *scb)
1157 /* Event handling for ASYNC serial code.
1159 At any time the SERIAL device either: has an empty FIFO and is
1160 waiting on a FD event; or has a non-empty FIFO/error condition and
1161 is constantly scheduling timer events.
1163 ASYNC only stops pestering its client when it is de-async'ed or it
1164 is told to go away. */
1166 /* Value of scb->async_state: */
1168 /* >= 0 (TIMER_SCHEDULED) */
1169 /* The ID of the currently scheduled timer event. This state is
1170 rarely encountered. Timer events are one-off so as soon as the
1171 event is delivered the state is shanged to NOTHING_SCHEDULED. */
1173 /* The fd_event() handler is scheduled. It is called when ever the
1174 file descriptor becomes ready. */
1175 NOTHING_SCHEDULED = -2
1176 /* Either no task is scheduled (just going into ASYNC mode) or a
1177 timer event has just gone off and the current state has been
1178 forced into nothing scheduled. */
1181 /* Identify and schedule the next ASYNC task based on scb->async_state
1182 and scb->buf* (the input FIFO). A state machine is used to avoid
1183 the need to make redundant calls into the event-loop - the next
1184 scheduled task is only changed when needed. */
1187 reschedule (struct serial *scb)
1189 if (serial_is_async_p (scb))
1192 switch (scb->async_state)
1195 if (scb->bufcnt == 0)
1196 next_state = FD_SCHEDULED;
1199 delete_file_handler (scb->fd);
1200 next_state = create_timer (0, push_event, scb);
1203 case NOTHING_SCHEDULED:
1204 if (scb->bufcnt == 0)
1206 add_file_handler (scb->fd, fd_event, scb);
1207 next_state = FD_SCHEDULED;
1211 next_state = create_timer (0, push_event, scb);
1214 default: /* TIMER SCHEDULED */
1215 if (scb->bufcnt == 0)
1217 delete_timer (scb->async_state);
1218 add_file_handler (scb->fd, fd_event, scb);
1219 next_state = FD_SCHEDULED;
1222 next_state = scb->async_state;
1225 if (serial_debug_p (scb))
1230 if (scb->async_state != FD_SCHEDULED)
1231 fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n",
1234 default: /* TIMER SCHEDULED */
1235 if (scb->async_state == FD_SCHEDULED)
1236 fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n",
1241 scb->async_state = next_state;
1245 /* FD_EVENT: This is scheduled when the input FIFO is empty (and there
1246 is no pending error). As soon as data arrives, it is read into the
1247 input FIFO and the client notified. The client should then drain
1248 the FIFO using readchar(). If the FIFO isn't immediatly emptied,
1249 push_event() is used to nag the client until it is. */
1252 fd_event (int error, void *context)
1254 struct serial *scb = context;
1257 scb->bufcnt = SERIAL_ERROR;
1259 else if (scb->bufcnt == 0)
1261 /* Prime the input FIFO. The readchar() function is used to
1262 pull characters out of the buffer. See also
1263 generic_readchar(). */
1267 nr = read (scb->fd, scb->buf, BUFSIZ);
1269 while (nr == -1 && errno == EINTR);
1272 scb->bufcnt = SERIAL_EOF;
1277 scb->bufp = scb->buf;
1281 scb->bufcnt = SERIAL_ERROR;
1284 scb->async_handler (scb, scb->async_context);
1288 /* PUSH_EVENT: The input FIFO is non-empty (or there is a pending
1289 error). Nag the client until all the data has been read. In the
1290 case of errors, the client will need to close or de-async the
1291 device before naging stops. */
1294 push_event (void *context)
1296 struct serial *scb = context;
1297 scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */
1298 scb->async_handler (scb, scb->async_context);
1303 /* Put the SERIAL device into/out-of ASYNC mode. */
1306 ser_unix_async (struct serial *scb,
1311 /* Force a re-schedule. */
1312 scb->async_state = NOTHING_SCHEDULED;
1313 if (serial_debug_p (scb))
1314 fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n",
1320 if (serial_debug_p (scb))
1321 fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n",
1323 /* De-schedule whatever tasks are currently scheduled. */
1324 switch (scb->async_state)
1327 delete_file_handler (scb->fd);
1329 case NOTHING_SCHEDULED:
1331 default: /* TIMER SCHEDULED */
1332 delete_timer (scb->async_state);
1339 _initialize_ser_hardwire (void)
1341 struct serial_ops *ops = XMALLOC (struct serial_ops);
1342 memset (ops, 0, sizeof (struct serial_ops));
1343 ops->name = "hardwire";
1345 ops->open = hardwire_open;
1346 ops->close = hardwire_close;
1347 /* FIXME: Don't replace this with the equivalent ser_unix*() until
1348 the old TERMIOS/SGTTY/... timer code has been flushed. cagney
1350 ops->readchar = hardwire_readchar;
1351 ops->write = ser_unix_write;
1352 ops->flush_output = hardwire_flush_output;
1353 ops->flush_input = hardwire_flush_input;
1354 ops->send_break = hardwire_send_break;
1355 ops->go_raw = hardwire_raw;
1356 ops->get_tty_state = hardwire_get_tty_state;
1357 ops->set_tty_state = hardwire_set_tty_state;
1358 ops->print_tty_state = hardwire_print_tty_state;
1359 ops->noflush_set_tty_state = hardwire_noflush_set_tty_state;
1360 ops->setbaudrate = hardwire_setbaudrate;
1361 ops->setstopbits = hardwire_setstopbits;
1362 ops->drain_output = hardwire_drain_output;
1363 ops->async = ser_unix_async;
1364 serial_add_interface (ops);