/* Serial interface for local (hardwired) serial ports on Un*x like systems
- Copyright 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 1994 Free Software Foundation, Inc.
This file is part of GDB.
#include "serial.h"
#include <fcntl.h>
#include <sys/types.h>
-#include <sys/time.h>
#if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
#define HAVE_SGTTY
#ifdef HAVE_TERMIOS
#include <termios.h>
#include <unistd.h>
-#endif
+
+struct hardwire_ttystate
+{
+ struct termios termios;
+};
+#endif /* termios */
+
#ifdef HAVE_TERMIO
-#include <sys/termio.h>
-#endif
+#include <termio.h>
+
+/* It is believed that all systems which have added job control to SVR3
+ (e.g. sco) have also added termios. Even if not, trying to figure out
+ all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
+ bewildering. So we don't attempt it. */
+
+struct hardwire_ttystate
+{
+ struct termio termio;
+};
+#endif /* termio */
+
#ifdef HAVE_SGTTY
+/* Needed for the code which uses select(). We would include <sys/select.h>
+ too if it existed on all systems. */
+#include <sys/time.h>
+
#include <sgtty.h>
-#endif
+
+struct hardwire_ttystate
+{
+ struct sgttyb sgttyb;
+ struct tchars tc;
+ struct ltchars ltc;
+ /* Line discipline flags. */
+ int lmode;
+};
+#endif /* sgtty */
+
+static int hardwire_open PARAMS ((serial_t scb, const char *name));
+static void hardwire_raw PARAMS ((serial_t scb));
+static int wait_for PARAMS ((serial_t scb, int timeout));
+static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
+static int rate_to_code PARAMS ((int rate));
+static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
+static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
+/* FIXME: static void hardwire_restore PARAMS ((serial_t scb)); */
+static void hardwire_close PARAMS ((serial_t scb));
+static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
+static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
+static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
+static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
/* Open up a real live device for serial I/O */
{
scb->fd = open (name, O_RDWR);
if (scb->fd < 0)
- return errno;
+ return -1;
return 0;
}
+static int
+get_tty_state(scb, state)
+ serial_t scb;
+ struct hardwire_ttystate *state;
+{
+#ifdef HAVE_TERMIOS
+ extern int errno;
+
+ if (tcgetattr(scb->fd, &state->termios) < 0)
+ return -1;
+
+ return 0;
+#endif
+
+#ifdef HAVE_TERMIO
+ if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
+ return -1;
+ return 0;
+#endif
+
+#ifdef HAVE_SGTTY
+ if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
+ return -1;
+
+ return 0;
+#endif
+}
+
+static int
+set_tty_state(scb, state)
+ serial_t scb;
+ struct hardwire_ttystate *state;
+{
+#ifdef HAVE_TERMIOS
+ if (tcsetattr(scb->fd, TCSANOW, &state->termios) < 0)
+ return -1;
+
+ return 0;
+#endif
+
+#ifdef HAVE_TERMIO
+ if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
+ return -1;
+ return 0;
+#endif
+
+#ifdef HAVE_SGTTY
+ if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
+ return -1;
+ if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
+ return -1;
+
+ return 0;
+#endif
+}
+
+static serial_ttystate
+hardwire_get_tty_state(scb)
+ serial_t scb;
+{
+ struct hardwire_ttystate *state;
+
+ state = (struct hardwire_ttystate *)xmalloc(sizeof *state);
+
+ if (get_tty_state(scb, state))
+ return NULL;
+
+ return (serial_ttystate)state;
+}
+
+static int
+hardwire_set_tty_state(scb, ttystate)
+ serial_t scb;
+ serial_ttystate ttystate;
+{
+ struct hardwire_ttystate *state;
+
+ state = (struct hardwire_ttystate *)ttystate;
+
+ return set_tty_state(scb, state);
+}
+
+static int
+hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
+ serial_t scb;
+ serial_ttystate new_ttystate;
+ serial_ttystate old_ttystate;
+{
+ struct hardwire_ttystate new_state;
+ struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
+
+ new_state = *(struct hardwire_ttystate *)new_ttystate;
+
+ /* Don't change in or out of raw mode; we don't want to flush input.
+ termio and termios have no such restriction; for them flushing input
+ is separate from setting the attributes. */
+
+#ifdef HAVE_SGTTY
+ if (state->sgttyb.sg_flags & RAW)
+ new_state.sgttyb.sg_flags |= RAW;
+ else
+ new_state.sgttyb.sg_flags &= ~RAW;
+
+ /* I'm not sure whether this is necessary; the manpage just mentions
+ RAW not CBREAK. */
+ if (state->sgttyb.sg_flags & CBREAK)
+ new_state.sgttyb.sg_flags |= CBREAK;
+ else
+ new_state.sgttyb.sg_flags &= ~CBREAK;
+#endif
+
+ return set_tty_state (scb, &new_state);
+}
+
static void
-hardwire_raw(scb)
+hardwire_print_tty_state (scb, ttystate)
serial_t scb;
+ serial_ttystate ttystate;
{
+ struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
+ int i;
+
#ifdef HAVE_TERMIOS
- struct termios termios;
+ printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
+ state->termios.c_iflag, state->termios.c_oflag);
+ printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
+ state->termios.c_cflag, state->termios.c_lflag);
+#if 0
+ /* This not in POSIX, and is not really documented by those systems
+ which have it (at least not Sun). */
+ printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
+#endif
+ printf_filtered ("c_cc: ");
+ for (i = 0; i < NCCS; i += 1)
+ printf_filtered ("0x%x ", state->termios.c_cc[i]);
+ printf_filtered ("\n");
+#endif
- if (tcgetattr(scb->fd, &termios))
- {
- fprintf(stderr, "tcgetattr failed: %s\n", safe_strerror(errno));
- }
+#ifdef HAVE_TERMIO
+ printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
+ state->termio.c_iflag, state->termio.c_oflag);
+ printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
+ state->termio.c_cflag, state->termio.c_lflag,
+ state->termio.c_line);
+ printf_filtered ("c_cc: ");
+ for (i = 0; i < NCC; i += 1)
+ printf_filtered ("0x%x ", state->termio.c_cc[i]);
+ printf_filtered ("\n");
+#endif
- termios.c_iflag = 0;
- termios.c_oflag = 0;
- termios.c_lflag = 0;
- termios.c_cflag &= ~(CSIZE|PARENB);
- termios.c_cflag |= CS8;
- termios.c_cc[VMIN] = 0;
- termios.c_cc[VTIME] = 0;
+#ifdef HAVE_SGTTY
+ printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
- if (tcsetattr(scb->fd, TCSANOW, &termios))
- {
- fprintf(stderr, "tcsetattr failed: %s\n", safe_strerror(errno));
- }
+ printf_filtered ("tchars: ");
+ for (i = 0; i < (int)sizeof (struct tchars); i++)
+ printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
+ printf_filtered ("\n");
+
+ printf_filtered ("ltchars: ");
+ for (i = 0; i < (int)sizeof (struct ltchars); i++)
+ printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
+ printf_filtered ("\n");
+
+ printf_filtered ("lmode: 0x%x\n", state->lmode);
+#endif
+}
+
+static int
+hardwire_flush_output (scb)
+ serial_t scb;
+{
+#ifdef HAVE_TERMIOS
+ return tcflush (scb->fd, TCOFLUSH);
#endif
#ifdef HAVE_TERMIO
- struct termio termio;
+ return ioctl (scb->fd, TCFLSH, 1);
+#endif
- if (ioctl (scb->fd, TCGETA, &termio))
- {
- fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
- }
+#ifdef HAVE_SGTTY
+ /* This flushes both input and output, but we can't do better. */
+ return ioctl (scb->fd, TIOCFLUSH, 0);
+#endif
+}
- termio.c_iflag = 0;
- termio.c_oflag = 0;
- termio.c_lflag = 0;
- termio.c_cflag &= ~(CSIZE|PARENB);
- termio.c_cflag |= CS8;
- termio.c_cc[VMIN] = 0;
- termio.c_cc[VTIME] = 0;
+static int
+hardwire_flush_input (scb)
+ serial_t scb;
+{
+#ifdef HAVE_TERMIOS
+ return tcflush (scb->fd, TCIFLUSH);
+#endif
- if (ioctl (scb->fd, TCSETA, &termio))
- {
- fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
- }
+#ifdef HAVE_TERMIO
+ return ioctl (scb->fd, TCFLSH, 0);
#endif
#ifdef HAVE_SGTTY
- struct sgttyb sgttyb;
+ /* This flushes both input and output, but we can't do better. */
+ return ioctl (scb->fd, TIOCFLUSH, 0);
+#endif
+}
- if (ioctl (scb->fd, TIOCGETP, &sgttyb))
- fprintf(stderr, "TIOCGETP failed: %s\n", safe_strerror(errno));
+static int
+hardwire_send_break (scb)
+ serial_t scb;
+{
+#ifdef HAVE_TERMIOS
+ return tcsendbreak (scb->fd, 0);
+#endif
- sgttyb.sg_flags |= RAW | ANYP;
- sgttyb.sg_flags &= ~(CBREAK | ECHO);
+#ifdef HAVE_TERMIO
+ return ioctl (scb->fd, TCSBRK, 0);
+#endif
- if (ioctl (scb->fd, TIOCSETP, &sgttyb))
- fprintf(stderr, "TIOCSETP failed: %s\n", safe_strerror(errno));
+#ifdef HAVE_SGTTY
+ {
+ int status;
+ struct timeval timeout;
+
+ status = ioctl (scb->fd, TIOCSBRK, 0);
+
+ /* Can't use usleep; it doesn't exist in BSD 4.2. */
+ /* Note that if this select() is interrupted by a signal it will not wait
+ the full length of time. I think that is OK. */
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 250000;
+ select (0, 0, 0, 0, &timeout);
+ status = ioctl (scb->fd, TIOCCBRK, 0);
+ return status;
+ }
+#endif
+}
+
+static void
+hardwire_raw(scb)
+ serial_t scb;
+{
+ struct hardwire_ttystate state;
+
+ if (get_tty_state(scb, &state))
+ fprintf_unfiltered(gdb_stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
+
+#ifdef HAVE_TERMIOS
+ state.termios.c_iflag = 0;
+ state.termios.c_oflag = 0;
+ state.termios.c_lflag = 0;
+ state.termios.c_cflag &= ~(CSIZE|PARENB);
+ state.termios.c_cflag |= CLOCAL | CS8;
+ state.termios.c_cc[VMIN] = 0;
+ state.termios.c_cc[VTIME] = 0;
+#endif
+
+#ifdef HAVE_TERMIO
+ state.termio.c_iflag = 0;
+ state.termio.c_oflag = 0;
+ state.termio.c_lflag = 0;
+ state.termio.c_cflag &= ~(CSIZE|PARENB);
+ state.termio.c_cflag |= CLOCAL | CS8;
+ state.termio.c_cc[VMIN] = 0;
+ state.termio.c_cc[VTIME] = 0;
+#endif
+
+#ifdef HAVE_SGTTY
+ state.sgttyb.sg_flags |= RAW | ANYP;
+ state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
#endif
+
+ scb->current_timeout = 0;
+
+ if (set_tty_state (scb, &state))
+ fprintf_unfiltered(gdb_stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
}
-/* Read a character with user-specified timeout. TIMEOUT is number of seconds
- to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
- char if successful. Returns -2 if timeout expired, EOF if line dropped
- dead, or -3 for any other error (see errno in that case). */
+/* Wait for input on scb, with timeout seconds. Returns 0 on success,
+ otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
+
+ For termio{s}, we actually just setup VTIME if necessary, and let the
+ timeout occur in the read() in hardwire_read().
+ */
static int
-hardwire_readchar(scb, timeout)
+wait_for(scb, timeout)
serial_t scb;
int timeout;
{
- int numfds;
- struct timeval tv;
- fd_set readfds;
+ scb->timeout_remaining = 0;
- if (scb->bufcnt-- > 0)
- return *scb->bufp++;
+#ifdef HAVE_SGTTY
+ {
+ struct timeval tv;
+ fd_set readfds;
- FD_ZERO (&readfds);
+ FD_ZERO (&readfds);
- tv.tv_sec = timeout;
- tv.tv_usec = 0;
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
- FD_SET(scb->fd, &readfds);
+ FD_SET(scb->fd, &readfds);
- if (timeout >= 0)
- numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
- else
- numfds = select(scb->fd+1, &readfds, 0, 0, 0);
+ while (1)
+ {
+ int numfds;
- if (numfds <= 0)
- if (numfds == 0)
- return -2; /* Timeout */
- else
- return -3; /* Got an error from select */
+ if (timeout >= 0)
+ numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
+ else
+ numfds = select(scb->fd+1, &readfds, 0, 0, 0);
- scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
+ if (numfds <= 0)
+ if (numfds == 0)
+ return SERIAL_TIMEOUT;
+ else if (errno == EINTR)
+ continue;
+ else
+ return SERIAL_ERROR; /* Got an error from select or poll */
- if (scb->bufcnt <= 0)
- if (scb->bufcnt == 0)
- return EOF; /* 0 chars means end of file */
+ return 0;
+ }
+ }
+#endif /* HAVE_SGTTY */
+
+#if defined HAVE_TERMIO || defined HAVE_TERMIOS
+ if (timeout == scb->current_timeout)
+ return 0;
+
+ scb->current_timeout = timeout;
+
+ {
+ struct hardwire_ttystate state;
+
+ if (get_tty_state(scb, &state))
+ fprintf_unfiltered(gdb_stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
+
+#ifdef HAVE_TERMIOS
+ if (timeout < 0)
+ {
+ /* No timeout. */
+ state.termios.c_cc[VTIME] = 0;
+ state.termios.c_cc[VMIN] = 1;
+ }
else
- return -3; /* Got an error from read */
+ {
+ state.termios.c_cc[VMIN] = 0;
+ state.termios.c_cc[VTIME] = timeout * 10;
+ if (state.termios.c_cc[VTIME] != timeout * 10)
+ {
+
+ /* If c_cc is an 8-bit signed character, we can't go
+ bigger than this. If it is always unsigned, we could use
+ 25. */
+
+ scb->current_timeout = 12;
+ state.termios.c_cc[VTIME] = scb->current_timeout * 10;
+ scb->timeout_remaining = timeout - scb->current_timeout;
+ }
+ }
+#endif
+
+#ifdef HAVE_TERMIO
+ if (timeout < 0)
+ {
+ /* No timeout. */
+ state.termio.c_cc[VTIME] = 0;
+ state.termio.c_cc[VMIN] = 1;
+ }
+ else
+ {
+ state.termio.c_cc[VMIN] = 0;
+ state.termio.c_cc[VTIME] = timeout * 10;
+ if (state.termio.c_cc[VTIME] != timeout * 10)
+ {
+ /* If c_cc is an 8-bit signed character, we can't go
+ bigger than this. If it is always unsigned, we could use
+ 25. */
+
+ scb->current_timeout = 12;
+ state.termio.c_cc[VTIME] = scb->current_timeout * 10;
+ scb->timeout_remaining = timeout - scb->current_timeout;
+ }
+ }
+#endif
+
+ if (set_tty_state (scb, &state))
+ fprintf_unfiltered(gdb_stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
+
+ return 0;
+ }
+#endif /* HAVE_TERMIO || HAVE_TERMIOS */
+}
+
+/* Read a character with user-specified timeout. TIMEOUT is number of seconds
+ to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
+ char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line
+ dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */
+
+static int
+hardwire_readchar(scb, timeout)
+ serial_t scb;
+ int timeout;
+{
+ int status;
+
+ if (scb->bufcnt-- > 0)
+ return *scb->bufp++;
- scb->bufcnt--;
- scb->bufp = scb->buf;
- return *scb->bufp++;
+ while (1)
+ {
+ status = wait_for (scb, timeout);
+
+ if (status < 0)
+ return status;
+
+ scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
+
+ if (scb->bufcnt <= 0)
+ {
+ if (scb->bufcnt == 0)
+ {
+ /* Zero characters means timeout (it could also be EOF, but
+ we don't (yet at least) distinguish). */
+ if (scb->timeout_remaining > 0)
+ {
+ timeout = scb->timeout_remaining;
+ continue;
+ }
+ else
+ return SERIAL_TIMEOUT;
+ }
+ else if (errno == EINTR)
+ continue;
+ else
+ return SERIAL_ERROR; /* Got an error from read */
+ }
+
+ scb->bufcnt--;
+ scb->bufp = scb->buf;
+ return *scb->bufp++;
+ }
}
#ifndef B19200
serial_t scb;
int rate;
{
-#ifdef HAVE_TERMIOS
- struct termios termios;
+ struct hardwire_ttystate state;
- if (tcgetattr (scb->fd, &termios))
- error("hardwire_setbaudrate: tcgetattr failed: %s\n", safe_strerror(errno));
+ if (get_tty_state(scb, &state))
+ return -1;
- cfsetospeed (&termios, rate_to_code (rate));
- cfsetispeed (&termios, rate_to_code (rate));
-
- if (tcsetattr (scb->fd, TCSANOW, &termios))
- error ("hardwire_setbaudrate: tcsetattr failed: %s\n", safe_strerror(errno));
-
- return 1;
+#ifdef HAVE_TERMIOS
+ cfsetospeed (&state.termios, rate_to_code (rate));
+ cfsetispeed (&state.termios, rate_to_code (rate));
#endif
#ifdef HAVE_TERMIO
- struct termio termio;
-
- if (ioctl (scb->fd, TCGETA, &termio))
- {
- fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
- }
-
#ifndef CIBAUD
#define CIBAUD CBAUD
#endif
- termio.c_cflag &= ~(CBAUD | CIBAUD);
- termio.c_cflag |= rate_to_code (rate);
-
- if (ioctl (scb->fd, TCSETA, &termio))
- {
- fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
- }
+ state.termio.c_cflag &= ~(CBAUD | CIBAUD);
+ state.termio.c_cflag |= rate_to_code (rate);
#endif
#ifdef HAVE_SGTTY
- struct sgttyb sgttyb;
-
- if (ioctl (scb->fd, TIOCGETP, &sgttyb))
- fprintf (stderr, "TIOCGETP failed: %s\n", safe_strerror (errno));
-
- sgttyb.sg_ispeed = rate_to_code (rate);
- sgttyb.sg_ospeed = rate_to_code (rate);
-
- if (ioctl (scb->fd, TIOCSETP, &sgttyb))
- fprintf (stderr, "TIOCSETP failed: %s\n", safe_strerror (errno));
+ state.sgttyb.sg_ispeed = rate_to_code (rate);
+ state.sgttyb.sg_ospeed = rate_to_code (rate);
#endif
+
+ return set_tty_state (scb, &state);
}
static int
return 0;
}
-static void
-hardwire_restore(scb)
- serial_t scb;
-{
-}
-
static void
hardwire_close(scb)
serial_t scb;
if (scb->fd < 0)
return;
- SERIAL_RESTORE(scb);
-
close(scb->fd);
scb->fd = -1;
}
hardwire_close,
hardwire_readchar,
hardwire_write,
+ hardwire_flush_output,
+ hardwire_flush_input,
+ hardwire_send_break,
hardwire_raw,
- hardwire_restore,
- hardwire_setbaudrate
+ hardwire_get_tty_state,
+ hardwire_set_tty_state,
+ hardwire_print_tty_state,
+ hardwire_noflush_set_tty_state,
+ hardwire_setbaudrate,
};
+void
_initialize_ser_hardwire ()
{
serial_add_interface (&hardwire_ops);
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