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 extern int (*ui_loop_hook) (int);
104 /* Open up a real live device for serial I/O */
107 hardwire_open (struct serial *scb, const char *name)
109 scb->fd = open (name, O_RDWR);
117 get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
120 if (tcgetattr (scb->fd, &state->termios) < 0)
127 if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
133 if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
135 if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
137 if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
139 if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
147 set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
150 if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
157 if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
163 if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
165 if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
167 if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
169 if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
176 static serial_ttystate
177 hardwire_get_tty_state (struct serial *scb)
179 struct hardwire_ttystate *state;
181 state = (struct hardwire_ttystate *) xmalloc (sizeof *state);
183 if (get_tty_state (scb, state))
186 return (serial_ttystate) state;
190 hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
192 struct hardwire_ttystate *state;
194 state = (struct hardwire_ttystate *) ttystate;
196 return set_tty_state (scb, state);
200 hardwire_noflush_set_tty_state (struct serial *scb,
201 serial_ttystate new_ttystate,
202 serial_ttystate old_ttystate)
204 struct hardwire_ttystate new_state;
206 struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
209 new_state = *(struct hardwire_ttystate *) new_ttystate;
211 /* Don't change in or out of raw mode; we don't want to flush input.
212 termio and termios have no such restriction; for them flushing input
213 is separate from setting the attributes. */
216 if (state->sgttyb.sg_flags & RAW)
217 new_state.sgttyb.sg_flags |= RAW;
219 new_state.sgttyb.sg_flags &= ~RAW;
221 /* I'm not sure whether this is necessary; the manpage just mentions
223 if (state->sgttyb.sg_flags & CBREAK)
224 new_state.sgttyb.sg_flags |= CBREAK;
226 new_state.sgttyb.sg_flags &= ~CBREAK;
229 return set_tty_state (scb, &new_state);
233 hardwire_print_tty_state (struct serial *scb,
234 serial_ttystate ttystate,
235 struct ui_file *stream)
237 struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
241 fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
242 (int) state->termios.c_iflag,
243 (int) state->termios.c_oflag);
244 fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
245 (int) state->termios.c_cflag,
246 (int) state->termios.c_lflag);
248 /* This not in POSIX, and is not really documented by those systems
249 which have it (at least not Sun). */
250 fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
252 fprintf_filtered (stream, "c_cc: ");
253 for (i = 0; i < NCCS; i += 1)
254 fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
255 fprintf_filtered (stream, "\n");
259 fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
260 state->termio.c_iflag, state->termio.c_oflag);
261 fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
262 state->termio.c_cflag, state->termio.c_lflag,
263 state->termio.c_line);
264 fprintf_filtered (stream, "c_cc: ");
265 for (i = 0; i < NCC; i += 1)
266 fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
267 fprintf_filtered (stream, "\n");
271 fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
272 state->sgttyb.sg_flags);
274 fprintf_filtered (stream, "tchars: ");
275 for (i = 0; i < (int) sizeof (struct tchars); i++)
276 fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
277 fprintf_filtered (stream, "\n");
279 fprintf_filtered (stream, "ltchars: ");
280 for (i = 0; i < (int) sizeof (struct ltchars); i++)
281 fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
282 fprintf_filtered (stream, "\n");
284 fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode);
288 /* Wait for the output to drain away, as opposed to flushing (discarding) it */
291 hardwire_drain_output (struct serial *scb)
294 return tcdrain (scb->fd);
298 return ioctl (scb->fd, TCSBRK, 1);
302 /* Get the current state and then restore it using TIOCSETP,
303 which should cause the output to drain and pending input
306 struct hardwire_ttystate state;
307 if (get_tty_state (scb, &state))
313 return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
320 hardwire_flush_output (struct serial *scb)
323 return tcflush (scb->fd, TCOFLUSH);
327 return ioctl (scb->fd, TCFLSH, 1);
331 /* This flushes both input and output, but we can't do better. */
332 return ioctl (scb->fd, TIOCFLUSH, 0);
337 hardwire_flush_input (struct serial *scb)
339 ser_unix_flush_input (scb);
342 return tcflush (scb->fd, TCIFLUSH);
346 return ioctl (scb->fd, TCFLSH, 0);
350 /* This flushes both input and output, but we can't do better. */
351 return ioctl (scb->fd, TIOCFLUSH, 0);
356 hardwire_send_break (struct serial *scb)
359 return tcsendbreak (scb->fd, 0);
363 return ioctl (scb->fd, TCSBRK, 0);
369 struct timeval timeout;
371 status = ioctl (scb->fd, TIOCSBRK, 0);
373 /* Can't use usleep; it doesn't exist in BSD 4.2. */
374 /* Note that if this select() is interrupted by a signal it will not wait
375 the full length of time. I think that is OK. */
377 timeout.tv_usec = 250000;
378 select (0, 0, 0, 0, &timeout);
379 status = ioctl (scb->fd, TIOCCBRK, 0);
386 hardwire_raw (struct serial *scb)
388 struct hardwire_ttystate state;
390 if (get_tty_state (scb, &state))
391 fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
394 state.termios.c_iflag = 0;
395 state.termios.c_oflag = 0;
396 state.termios.c_lflag = 0;
397 state.termios.c_cflag &= ~(CSIZE | PARENB);
398 state.termios.c_cflag |= CLOCAL | CS8;
399 state.termios.c_cc[VMIN] = 0;
400 state.termios.c_cc[VTIME] = 0;
404 state.termio.c_iflag = 0;
405 state.termio.c_oflag = 0;
406 state.termio.c_lflag = 0;
407 state.termio.c_cflag &= ~(CSIZE | PARENB);
408 state.termio.c_cflag |= CLOCAL | CS8;
409 state.termio.c_cc[VMIN] = 0;
410 state.termio.c_cc[VTIME] = 0;
414 state.sgttyb.sg_flags |= RAW | ANYP;
415 state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
418 scb->current_timeout = 0;
420 if (set_tty_state (scb, &state))
421 fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
424 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
425 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
427 For termio{s}, we actually just setup VTIME if necessary, and let the
428 timeout occur in the read() in hardwire_read().
431 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
432 ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
435 /* NOTE: cagney/1999-09-30: Much of the code below is dead. The only
436 possible values of the TIMEOUT parameter are ONE and ZERO.
437 Consequently all the code that tries to handle the possability of
438 an overflowed timer is unnecessary. */
441 wait_for (struct serial *scb, int timeout)
450 /* NOTE: Some OS's can scramble the READFDS when the select()
451 call fails (ex the kernel with Red Hat 5.2). Initialize all
452 arguments before each call. */
458 FD_SET (scb->fd, &readfds);
461 numfds = select (scb->fd + 1, &readfds, 0, 0, &tv);
463 numfds = select (scb->fd + 1, &readfds, 0, 0, 0);
467 return SERIAL_TIMEOUT;
468 else if (errno == EINTR)
471 return SERIAL_ERROR; /* Got an error from select or poll */
475 #endif /* HAVE_SGTTY */
477 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
478 if (timeout == scb->current_timeout)
481 scb->current_timeout = timeout;
484 struct hardwire_ttystate state;
486 if (get_tty_state (scb, &state))
487 fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
493 state.termios.c_cc[VTIME] = 0;
494 state.termios.c_cc[VMIN] = 1;
498 state.termios.c_cc[VMIN] = 0;
499 state.termios.c_cc[VTIME] = timeout * 10;
500 if (state.termios.c_cc[VTIME] != timeout * 10)
503 /* If c_cc is an 8-bit signed character, we can't go
504 bigger than this. If it is always unsigned, we could use
507 scb->current_timeout = 12;
508 state.termios.c_cc[VTIME] = scb->current_timeout * 10;
509 scb->timeout_remaining = timeout - scb->current_timeout;
518 state.termio.c_cc[VTIME] = 0;
519 state.termio.c_cc[VMIN] = 1;
523 state.termio.c_cc[VMIN] = 0;
524 state.termio.c_cc[VTIME] = timeout * 10;
525 if (state.termio.c_cc[VTIME] != timeout * 10)
527 /* If c_cc is an 8-bit signed character, we can't go
528 bigger than this. If it is always unsigned, we could use
531 scb->current_timeout = 12;
532 state.termio.c_cc[VTIME] = scb->current_timeout * 10;
533 scb->timeout_remaining = timeout - scb->current_timeout;
538 if (set_tty_state (scb, &state))
539 fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
543 #endif /* HAVE_TERMIO || HAVE_TERMIOS */
546 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
547 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
548 char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line
549 dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */
551 /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
552 ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
555 /* NOTE: cagney/1999-09-16: This function is not identical to
556 ser_unix_readchar() as part of replacing it with ser_unix*()
557 merging will be required - this code handles the case where read()
558 times out due to no data while ser_unix_readchar() doesn't expect
562 do_hardwire_readchar (struct serial *scb, int timeout)
570 /* We have to be able to keep the GUI alive here, so we break the original
571 timeout into steps of 1 second, running the "keep the GUI alive" hook
572 each time through the loop.
573 Also, timeout = 0 means to poll, so we just set the delta to 0, so we
574 will only go through the loop once. */
576 delta = (timeout == 0 ? 0 : 1);
580 /* N.B. The UI may destroy our world (for instance by calling
581 remote_stop,) in which case we want to get out of here as
582 quickly as possible. It is not safe to touch scb, since
583 someone else might have freed it. The ui_loop_hook signals that
584 we should exit by returning 1. */
587 detach = 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 original
949 timeout into steps of 1 second, running the "keep the GUI alive" hook
950 each time through the loop.
952 Also, timeout = 0 means to poll, so we just set the delta to 0, so we
953 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 ui_loop_hook signals that
963 we should exit by returning 1. */
967 if (ui_loop_hook (0))
968 return SERIAL_TIMEOUT;
971 status = ser_unix_wait_for (scb, delta);
975 /* If we got a character or an error back from wait_for, then we can
976 break from the loop before the timeout is completed. */
978 if (status != SERIAL_TIMEOUT)
983 /* If we have exhausted the original timeout, then generate
984 a SERIAL_TIMEOUT, and pass it out of the loop. */
986 else if (timeout == 0)
988 status = SERIAL_TIMEOUT;
998 status = read (scb->fd, scb->buf, BUFSIZ);
999 if (status != -1 || errno != EINTR)
1006 return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
1007 distinguish between EOF & timeouts
1010 return SERIAL_ERROR; /* Got an error from read */
1013 scb->bufcnt = status;
1015 scb->bufp = scb->buf;
1016 return *scb->bufp++;
1019 /* Perform operations common to both old and new readchar. */
1021 /* Return the next character from the input FIFO. If the FIFO is
1022 empty, call the SERIAL specific routine to try and read in more
1025 Initially data from the input FIFO is returned (fd_event()
1026 pre-reads the input into that FIFO. Once that has been emptied,
1027 further data is obtained by polling the input FD using the device
1028 specific readchar() function. Note: reschedule() is called after
1029 every read. This is because there is no guarentee that the lower
1030 level fd_event() poll_event() code (which also calls reschedule())
1034 generic_readchar (struct serial *scb, int timeout,
1035 int (do_readchar) (struct serial *scb, int timeout))
1038 if (scb->bufcnt > 0)
1044 else if (scb->bufcnt < 0)
1046 /* Some errors/eof are are sticky. */
1051 ch = do_readchar (scb, timeout);
1054 switch ((enum serial_rc) ch)
1058 /* Make the error/eof stick. */
1061 case SERIAL_TIMEOUT:
1072 ser_unix_readchar (struct serial *scb, int timeout)
1074 return generic_readchar (scb, timeout, do_unix_readchar);
1078 ser_unix_nop_noflush_set_tty_state (struct serial *scb,
1079 serial_ttystate new_ttystate,
1080 serial_ttystate old_ttystate)
1086 ser_unix_nop_print_tty_state (struct serial *scb,
1087 serial_ttystate ttystate,
1088 struct ui_file *stream)
1090 /* Nothing to print. */
1095 ser_unix_nop_setbaudrate (struct serial *scb, int rate)
1097 return 0; /* Never fails! */
1101 ser_unix_nop_setstopbits (struct serial *scb, int num)
1103 return 0; /* Never fails! */
1107 ser_unix_write (struct serial *scb, const char *str, int len)
1113 cc = write (scb->fd, str, len);
1124 ser_unix_nop_flush_output (struct serial *scb)
1130 ser_unix_flush_input (struct serial *scb)
1132 if (scb->bufcnt >= 0)
1135 scb->bufp = scb->buf;
1139 return SERIAL_ERROR;
1143 ser_unix_nop_send_break (struct serial *scb)
1149 ser_unix_nop_drain_output (struct serial *scb)
1156 /* Event handling for ASYNC serial code.
1158 At any time the SERIAL device either: has an empty FIFO and is
1159 waiting on a FD event; or has a non-empty FIFO/error condition and
1160 is constantly scheduling timer events.
1162 ASYNC only stops pestering its client when it is de-async'ed or it
1163 is told to go away. */
1165 /* Value of scb->async_state: */
1167 /* >= 0 (TIMER_SCHEDULED) */
1168 /* The ID of the currently scheduled timer event. This state is
1169 rarely encountered. Timer events are one-off so as soon as the
1170 event is delivered the state is shanged to NOTHING_SCHEDULED. */
1172 /* The fd_event() handler is scheduled. It is called when ever the
1173 file descriptor becomes ready. */
1174 NOTHING_SCHEDULED = -2
1175 /* Either no task is scheduled (just going into ASYNC mode) or a
1176 timer event has just gone off and the current state has been
1177 forced into nothing scheduled. */
1180 /* Identify and schedule the next ASYNC task based on scb->async_state
1181 and scb->buf* (the input FIFO). A state machine is used to avoid
1182 the need to make redundant calls into the event-loop - the next
1183 scheduled task is only changed when needed. */
1186 reschedule (struct serial *scb)
1188 if (serial_is_async_p (scb))
1191 switch (scb->async_state)
1194 if (scb->bufcnt == 0)
1195 next_state = FD_SCHEDULED;
1198 delete_file_handler (scb->fd);
1199 next_state = create_timer (0, push_event, scb);
1202 case NOTHING_SCHEDULED:
1203 if (scb->bufcnt == 0)
1205 add_file_handler (scb->fd, fd_event, scb);
1206 next_state = FD_SCHEDULED;
1210 next_state = create_timer (0, push_event, scb);
1213 default: /* TIMER SCHEDULED */
1214 if (scb->bufcnt == 0)
1216 delete_timer (scb->async_state);
1217 add_file_handler (scb->fd, fd_event, scb);
1218 next_state = FD_SCHEDULED;
1221 next_state = scb->async_state;
1224 if (serial_debug_p (scb))
1229 if (scb->async_state != FD_SCHEDULED)
1230 fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n",
1233 default: /* TIMER SCHEDULED */
1234 if (scb->async_state == FD_SCHEDULED)
1235 fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n",
1240 scb->async_state = next_state;
1244 /* FD_EVENT: This is scheduled when the input FIFO is empty (and there
1245 is no pending error). As soon as data arrives, it is read into the
1246 input FIFO and the client notified. The client should then drain
1247 the FIFO using readchar(). If the FIFO isn't immediatly emptied,
1248 push_event() is used to nag the client until it is. */
1251 fd_event (int error, void *context)
1253 struct serial *scb = context;
1256 scb->bufcnt = SERIAL_ERROR;
1258 else if (scb->bufcnt == 0)
1260 /* Prime the input FIFO. The readchar() function is used to
1261 pull characters out of the buffer. See also
1262 generic_readchar(). */
1266 nr = read (scb->fd, scb->buf, BUFSIZ);
1268 while (nr == -1 && errno == EINTR);
1271 scb->bufcnt = SERIAL_EOF;
1276 scb->bufp = scb->buf;
1280 scb->bufcnt = SERIAL_ERROR;
1283 scb->async_handler (scb, scb->async_context);
1287 /* PUSH_EVENT: The input FIFO is non-empty (or there is a pending
1288 error). Nag the client until all the data has been read. In the
1289 case of errors, the client will need to close or de-async the
1290 device before naging stops. */
1293 push_event (void *context)
1295 struct serial *scb = context;
1296 scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */
1297 scb->async_handler (scb, scb->async_context);
1302 /* Put the SERIAL device into/out-of ASYNC mode. */
1305 ser_unix_async (struct serial *scb,
1310 /* Force a re-schedule. */
1311 scb->async_state = NOTHING_SCHEDULED;
1312 if (serial_debug_p (scb))
1313 fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n",
1319 if (serial_debug_p (scb))
1320 fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n",
1322 /* De-schedule whatever tasks are currently scheduled. */
1323 switch (scb->async_state)
1326 delete_file_handler (scb->fd);
1328 case NOTHING_SCHEDULED:
1330 default: /* TIMER SCHEDULED */
1331 delete_timer (scb->async_state);
1338 _initialize_ser_hardwire (void)
1340 struct serial_ops *ops = XMALLOC (struct serial_ops);
1341 memset (ops, 0, sizeof (struct serial_ops));
1342 ops->name = "hardwire";
1344 ops->open = hardwire_open;
1345 ops->close = hardwire_close;
1346 /* FIXME: Don't replace this with the equivalent ser_unix*() until
1347 the old TERMIOS/SGTTY/... timer code has been flushed. cagney
1349 ops->readchar = hardwire_readchar;
1350 ops->write = ser_unix_write;
1351 ops->flush_output = hardwire_flush_output;
1352 ops->flush_input = hardwire_flush_input;
1353 ops->send_break = hardwire_send_break;
1354 ops->go_raw = hardwire_raw;
1355 ops->get_tty_state = hardwire_get_tty_state;
1356 ops->set_tty_state = hardwire_set_tty_state;
1357 ops->print_tty_state = hardwire_print_tty_state;
1358 ops->noflush_set_tty_state = hardwire_noflush_set_tty_state;
1359 ops->setbaudrate = hardwire_setbaudrate;
1360 ops->setstopbits = hardwire_setstopbits;
1361 ops->drain_output = hardwire_drain_output;
1362 ops->async = ser_unix_async;
1363 serial_add_interface (ops);