/* Serial interface for local (hardwired) serial ports on Un*x like systems
- Copyright 1992, 1993, 1994, 1998 Free Software Foundation, Inc.
+
+ Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
+ 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "serial.h"
+#include "ser-unix.h"
+
#include <fcntl.h>
#include <sys/types.h>
#include "terminal.h"
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include "gdb_string.h"
+#include "event-loop.h"
#ifdef HAVE_TERMIOS
#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>
-
struct hardwire_ttystate
{
struct sgttyb sgttyb;
};
#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));
-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));
-static int hardwire_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
- serial_ttystate));
-static void hardwire_print_tty_state PARAMS ((serial_t, serial_ttystate));
-static int hardwire_drain_output PARAMS ((serial_t));
-static int hardwire_flush_output PARAMS ((serial_t));
-static int hardwire_flush_input PARAMS ((serial_t));
-static int hardwire_send_break PARAMS ((serial_t));
-static int hardwire_setstopbits PARAMS ((serial_t, int));
-
-void _initialize_ser_hardwire PARAMS ((void));
-
-extern int (*ui_loop_hook) PARAMS ((int));
+static int hardwire_open (struct serial *scb, const char *name);
+static void hardwire_raw (struct serial *scb);
+static int wait_for (struct serial *scb, int timeout);
+static int hardwire_readchar (struct serial *scb, int timeout);
+static int do_hardwire_readchar (struct serial *scb, int timeout);
+static int generic_readchar (struct serial *scb, int timeout,
+ int (*do_readchar) (struct serial *scb,
+ int timeout));
+static int rate_to_code (int rate);
+static int hardwire_setbaudrate (struct serial *scb, int rate);
+static void hardwire_close (struct serial *scb);
+static int get_tty_state (struct serial *scb,
+ struct hardwire_ttystate * state);
+static int set_tty_state (struct serial *scb,
+ struct hardwire_ttystate * state);
+static serial_ttystate hardwire_get_tty_state (struct serial *scb);
+static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);
+static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,
+ serial_ttystate);
+static void hardwire_print_tty_state (struct serial *, serial_ttystate,
+ struct ui_file *);
+static int hardwire_drain_output (struct serial *);
+static int hardwire_flush_output (struct serial *);
+static int hardwire_flush_input (struct serial *);
+static int hardwire_send_break (struct serial *);
+static int hardwire_setstopbits (struct serial *, int);
+
+static int do_unix_readchar (struct serial *scb, int timeout);
+static timer_handler_func push_event;
+static handler_func fd_event;
+static void reschedule (struct serial *scb);
+
+void _initialize_ser_hardwire (void);
+
+extern int (*ui_loop_hook) (int);
/* Open up a real live device for serial I/O */
static int
-hardwire_open (scb, name)
- serial_t scb;
- const char *name;
+hardwire_open (struct serial *scb, const char *name)
{
scb->fd = open (name, O_RDWR);
if (scb->fd < 0)
}
static int
-get_tty_state (scb, state)
- serial_t scb;
- struct hardwire_ttystate *state;
+get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
{
#ifdef HAVE_TERMIOS
if (tcgetattr (scb->fd, &state->termios) < 0)
}
static int
-set_tty_state (scb, state)
- serial_t scb;
- struct hardwire_ttystate *state;
+set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
{
#ifdef HAVE_TERMIOS
if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
}
static serial_ttystate
-hardwire_get_tty_state (scb)
- serial_t scb;
+hardwire_get_tty_state (struct serial *scb)
{
struct hardwire_ttystate *state;
}
static int
-hardwire_set_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
+hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
{
struct hardwire_ttystate *state;
}
static int
-hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
- serial_t scb;
- serial_ttystate new_ttystate;
- serial_ttystate old_ttystate;
+hardwire_noflush_set_tty_state (struct serial *scb,
+ serial_ttystate new_ttystate,
+ serial_ttystate old_ttystate)
{
struct hardwire_ttystate new_state;
#ifdef HAVE_SGTTY
}
static void
-hardwire_print_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
+hardwire_print_tty_state (struct serial *scb,
+ serial_ttystate ttystate,
+ struct ui_file *stream)
{
struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
int i;
#ifdef HAVE_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);
+ fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
+ (int) state->termios.c_iflag,
+ (int) state->termios.c_oflag);
+ fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
+ (int) state->termios.c_cflag,
+ (int) 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);
+ fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
#endif
- printf_filtered ("c_cc: ");
+ fprintf_filtered (stream, "c_cc: ");
for (i = 0; i < NCCS; i += 1)
- printf_filtered ("0x%x ", state->termios.c_cc[i]);
- printf_filtered ("\n");
+ fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
+ fprintf_filtered (stream, "\n");
#endif
#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: ");
+ fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
+ state->termio.c_iflag, state->termio.c_oflag);
+ fprintf_filtered (stream, "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);
+ fprintf_filtered (stream, "c_cc: ");
for (i = 0; i < NCC; i += 1)
- printf_filtered ("0x%x ", state->termio.c_cc[i]);
- printf_filtered ("\n");
+ fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
+ fprintf_filtered (stream, "\n");
#endif
#ifdef HAVE_SGTTY
- printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
+ fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
+ state->sgttyb.sg_flags);
- printf_filtered ("tchars: ");
+ fprintf_filtered (stream, "tchars: ");
for (i = 0; i < (int) sizeof (struct tchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *) &state->tc)[i]);
- printf_filtered ("\n");
+ fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
+ fprintf_filtered (stream, "\n");
- printf_filtered ("ltchars: ");
+ fprintf_filtered (stream, "ltchars: ");
for (i = 0; i < (int) sizeof (struct ltchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *) &state->ltc)[i]);
- printf_filtered ("\n");
+ fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
+ fprintf_filtered (stream, "\n");
- printf_filtered ("lmode: 0x%x\n", state->lmode);
+ fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode);
#endif
}
/* Wait for the output to drain away, as opposed to flushing (discarding) it */
static int
-hardwire_drain_output (scb)
- serial_t scb;
+hardwire_drain_output (struct serial *scb)
{
#ifdef HAVE_TERMIOS
return tcdrain (scb->fd);
}
static int
-hardwire_flush_output (scb)
- serial_t scb;
+hardwire_flush_output (struct serial *scb)
{
#ifdef HAVE_TERMIOS
return tcflush (scb->fd, TCOFLUSH);
}
static int
-hardwire_flush_input (scb)
- serial_t scb;
+hardwire_flush_input (struct serial *scb)
{
- scb->bufcnt = 0;
- scb->bufp = scb->buf;
+ ser_unix_flush_input (scb);
#ifdef HAVE_TERMIOS
return tcflush (scb->fd, TCIFLUSH);
}
static int
-hardwire_send_break (scb)
- serial_t scb;
+hardwire_send_break (struct serial *scb)
{
#ifdef HAVE_TERMIOS
return tcsendbreak (scb->fd, 0);
}
static void
-hardwire_raw (scb)
- serial_t scb;
+hardwire_raw (struct serial *scb)
{
struct hardwire_ttystate state;
timeout occur in the read() in hardwire_read().
*/
+/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
+ ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
+ flushed. . */
+
+/* NOTE: cagney/1999-09-30: Much of the code below is dead. The only
+ possible values of the TIMEOUT parameter are ONE and ZERO.
+ Consequently all the code that tries to handle the possability of
+ an overflowed timer is unnecessary. */
+
static int
-wait_for (scb, timeout)
- serial_t scb;
- int timeout;
+wait_for (struct serial *scb, int timeout)
{
#ifdef HAVE_SGTTY
- {
- struct timeval tv;
- fd_set readfds;
-
- FD_ZERO (&readfds);
-
- tv.tv_sec = timeout;
- tv.tv_usec = 0;
-
- FD_SET (scb->fd, &readfds);
-
- while (1)
- {
- int numfds;
-
- if (timeout >= 0)
- numfds = select (scb->fd + 1, &readfds, 0, 0, &tv);
+ while (1)
+ {
+ struct timeval tv;
+ fd_set readfds;
+ int numfds;
+
+ /* NOTE: Some OS's can scramble the READFDS when the select()
+ call fails (ex the kernel with Red Hat 5.2). Initialize all
+ arguments before each call. */
+
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+
+ FD_ZERO (&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);
+
+ if (numfds <= 0)
+ if (numfds == 0)
+ return SERIAL_TIMEOUT;
+ else if (errno == EINTR)
+ continue;
else
- numfds = select (scb->fd + 1, &readfds, 0, 0, 0);
-
- 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 */
+ return SERIAL_ERROR; /* Got an error from select or poll */
- return 0;
- }
- }
+ return 0;
+ }
#endif /* HAVE_SGTTY */
#if defined HAVE_TERMIO || defined HAVE_TERMIOS
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). */
+
+/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
+ ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
+ flushed. */
+
+/* NOTE: cagney/1999-09-16: This function is not identical to
+ ser_unix_readchar() as part of replacing it with ser_unix*()
+ merging will be required - this code handles the case where read()
+ times out due to no data while ser_unix_readchar() doesn't expect
+ that. */
+
static int
-hardwire_readchar (scb, timeout)
- serial_t scb;
- int timeout;
+do_hardwire_readchar (struct serial *scb, int timeout)
{
int status, delta;
int detach = 0;
- if (scb->bufcnt-- > 0)
- return *scb->bufp++;
-
if (timeout > 0)
timeout++;
if (status < 0)
return status;
- scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
+ status = read (scb->fd, scb->buf, BUFSIZ);
- if (scb->bufcnt <= 0)
+ if (status <= 0)
{
- if (scb->bufcnt == 0)
+ if (status == 0)
{
/* Zero characters means timeout (it could also be EOF, but
we don't (yet at least) distinguish). */
return SERIAL_ERROR; /* Got an error from read */
}
+ scb->bufcnt = status;
scb->bufcnt--;
scb->bufp = scb->buf;
return *scb->bufp++;
}
}
+static int
+hardwire_readchar (struct serial *scb, int timeout)
+{
+ return generic_readchar (scb, timeout, do_hardwire_readchar);
+}
+
+
#ifndef B19200
#define B19200 EXTA
#endif
};
static int
-rate_to_code (rate)
- int rate;
+rate_to_code (int rate)
{
int i;
for (i = 0; baudtab[i].rate != -1; i++)
- if (rate == baudtab[i].rate)
- return baudtab[i].code;
-
+ {
+ /* test for perfect macth. */
+ if (rate == baudtab[i].rate)
+ return baudtab[i].code;
+ else
+ {
+ /* check if it is in between valid values. */
+ if (rate < baudtab[i].rate)
+ {
+ if (i)
+ {
+ warning ("Invalid baud rate %d. Closest values are %d and %d.",
+ rate, baudtab[i - 1].rate, baudtab[i].rate);
+ }
+ else
+ {
+ warning ("Invalid baud rate %d. Minimum value is %d.",
+ rate, baudtab[0].rate);
+ }
+ return -1;
+ }
+ }
+ }
+
+ /* The requested speed was too large. */
+ warning ("Invalid baud rate %d. Maximum value is %d.",
+ rate, baudtab[i - 1].rate);
return -1;
}
static int
-hardwire_setbaudrate (scb, rate)
- serial_t scb;
- int rate;
+hardwire_setbaudrate (struct serial *scb, int rate)
{
struct hardwire_ttystate state;
+ int baud_code = rate_to_code (rate);
+
+ if (baud_code < 0)
+ {
+ /* The baud rate was not valid.
+ A warning has already been issued. */
+ errno = EINVAL;
+ return -1;
+ }
if (get_tty_state (scb, &state))
return -1;
#ifdef HAVE_TERMIOS
- cfsetospeed (&state.termios, rate_to_code (rate));
- cfsetispeed (&state.termios, rate_to_code (rate));
+ cfsetospeed (&state.termios, baud_code);
+ cfsetispeed (&state.termios, baud_code);
#endif
#ifdef HAVE_TERMIO
#endif
state.termio.c_cflag &= ~(CBAUD | CIBAUD);
- state.termio.c_cflag |= rate_to_code (rate);
+ state.termio.c_cflag |= baud_code;
#endif
#ifdef HAVE_SGTTY
- state.sgttyb.sg_ispeed = rate_to_code (rate);
- state.sgttyb.sg_ospeed = rate_to_code (rate);
+ state.sgttyb.sg_ispeed = baud_code;
+ state.sgttyb.sg_ospeed = baud_code;
#endif
return set_tty_state (scb, &state);
}
static int
-hardwire_setstopbits (scb, num)
- serial_t scb;
- int num;
+hardwire_setstopbits (struct serial *scb, int num)
{
struct hardwire_ttystate state;
int newbit;
return set_tty_state (scb, &state);
}
+static void
+hardwire_close (struct serial *scb)
+{
+ if (scb->fd < 0)
+ return;
+
+ close (scb->fd);
+ scb->fd = -1;
+}
+
+\f
+/* Generic operations used by all UNIX/FD based serial interfaces. */
+
+serial_ttystate
+ser_unix_nop_get_tty_state (struct serial *scb)
+{
+ /* allocate a dummy */
+ return (serial_ttystate) XMALLOC (int);
+}
+
+int
+ser_unix_nop_set_tty_state (struct serial *scb, serial_ttystate ttystate)
+{
+ return 0;
+}
+
+void
+ser_unix_nop_raw (struct serial *scb)
+{
+ return; /* Always in raw mode */
+}
+
+/* Wait for input on scb, with timeout seconds. Returns 0 on success,
+ otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */
+
+int
+ser_unix_wait_for (struct serial *scb, int timeout)
+{
+ while (1)
+ {
+ int numfds;
+ struct timeval tv;
+ fd_set readfds, exceptfds;
+
+ /* NOTE: Some OS's can scramble the READFDS when the select()
+ call fails (ex the kernel with Red Hat 5.2). Initialize all
+ arguments before each call. */
+
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+
+ FD_ZERO (&readfds);
+ FD_ZERO (&exceptfds);
+ FD_SET (scb->fd, &readfds);
+ FD_SET (scb->fd, &exceptfds);
+
+ if (timeout >= 0)
+ numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
+ else
+ numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
+
+ 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 */
+ }
+
+ return 0;
+ }
+}
+
+/* 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). */
+
static int
-hardwire_write (scb, str, len)
- serial_t scb;
- const char *str;
- int len;
+do_unix_readchar (struct serial *scb, int timeout)
+{
+ int status;
+ int delta;
+
+ /* We have to be able to keep the GUI alive here, so we break the original
+ timeout into steps of 1 second, running the "keep the GUI alive" hook
+ each time through the loop.
+
+ Also, timeout = 0 means to poll, so we just set the delta to 0, so we
+ will only go through the loop once. */
+
+ delta = (timeout == 0 ? 0 : 1);
+ while (1)
+ {
+
+ /* N.B. The UI may destroy our world (for instance by calling
+ remote_stop,) in which case we want to get out of here as
+ quickly as possible. It is not safe to touch scb, since
+ someone else might have freed it. The ui_loop_hook signals that
+ we should exit by returning 1. */
+
+ if (ui_loop_hook)
+ {
+ if (ui_loop_hook (0))
+ return SERIAL_TIMEOUT;
+ }
+
+ status = ser_unix_wait_for (scb, delta);
+ if (timeout > 0)
+ timeout -= delta;
+
+ /* If we got a character or an error back from wait_for, then we can
+ break from the loop before the timeout is completed. */
+
+ if (status != SERIAL_TIMEOUT)
+ {
+ break;
+ }
+
+ /* If we have exhausted the original timeout, then generate
+ a SERIAL_TIMEOUT, and pass it out of the loop. */
+
+ else if (timeout == 0)
+ {
+ status = SERIAL_TIMEOUT;
+ break;
+ }
+ }
+
+ if (status < 0)
+ return status;
+
+ while (1)
+ {
+ status = read (scb->fd, scb->buf, BUFSIZ);
+ if (status != -1 || errno != EINTR)
+ break;
+ }
+
+ if (status <= 0)
+ {
+ if (status == 0)
+ return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
+ distinguish between EOF & timeouts
+ someday] */
+ else
+ return SERIAL_ERROR; /* Got an error from read */
+ }
+
+ scb->bufcnt = status;
+ scb->bufcnt--;
+ scb->bufp = scb->buf;
+ return *scb->bufp++;
+}
+
+/* Perform operations common to both old and new readchar. */
+
+/* Return the next character from the input FIFO. If the FIFO is
+ empty, call the SERIAL specific routine to try and read in more
+ characters.
+
+ Initially data from the input FIFO is returned (fd_event()
+ pre-reads the input into that FIFO. Once that has been emptied,
+ further data is obtained by polling the input FD using the device
+ specific readchar() function. Note: reschedule() is called after
+ every read. This is because there is no guarentee that the lower
+ level fd_event() poll_event() code (which also calls reschedule())
+ will be called. */
+
+static int
+generic_readchar (struct serial *scb, int timeout,
+ int (do_readchar) (struct serial *scb, int timeout))
+{
+ int ch;
+ if (scb->bufcnt > 0)
+ {
+ ch = *scb->bufp;
+ scb->bufcnt--;
+ scb->bufp++;
+ }
+ else if (scb->bufcnt < 0)
+ {
+ /* Some errors/eof are are sticky. */
+ ch = scb->bufcnt;
+ }
+ else
+ {
+ ch = do_readchar (scb, timeout);
+ if (ch < 0)
+ {
+ switch ((enum serial_rc) ch)
+ {
+ case SERIAL_EOF:
+ case SERIAL_ERROR:
+ /* Make the error/eof stick. */
+ scb->bufcnt = ch;
+ break;
+ case SERIAL_TIMEOUT:
+ scb->bufcnt = 0;
+ break;
+ }
+ }
+ }
+ reschedule (scb);
+ return ch;
+}
+
+int
+ser_unix_readchar (struct serial *scb, int timeout)
+{
+ return generic_readchar (scb, timeout, do_unix_readchar);
+}
+
+int
+ser_unix_nop_noflush_set_tty_state (struct serial *scb,
+ serial_ttystate new_ttystate,
+ serial_ttystate old_ttystate)
+{
+ return 0;
+}
+
+void
+ser_unix_nop_print_tty_state (struct serial *scb,
+ serial_ttystate ttystate,
+ struct ui_file *stream)
+{
+ /* Nothing to print. */
+ return;
+}
+
+int
+ser_unix_nop_setbaudrate (struct serial *scb, int rate)
+{
+ return 0; /* Never fails! */
+}
+
+int
+ser_unix_nop_setstopbits (struct serial *scb, int num)
+{
+ return 0; /* Never fails! */
+}
+
+int
+ser_unix_write (struct serial *scb, const char *str, int len)
{
int cc;
return 0;
}
-static void
-hardwire_close (scb)
- serial_t scb;
+int
+ser_unix_nop_flush_output (struct serial *scb)
{
- if (scb->fd < 0)
- return;
+ return 0;
+}
- close (scb->fd);
- scb->fd = -1;
+int
+ser_unix_flush_input (struct serial *scb)
+{
+ if (scb->bufcnt >= 0)
+ {
+ scb->bufcnt = 0;
+ scb->bufp = scb->buf;
+ return 0;
+ }
+ else
+ return SERIAL_ERROR;
+}
+
+int
+ser_unix_nop_send_break (struct serial *scb)
+{
+ return 0;
}
-static struct serial_ops hardwire_ops =
-{
- "hardwire",
- 0,
- hardwire_open,
- hardwire_close,
- hardwire_readchar,
- hardwire_write,
- hardwire_flush_output,
- hardwire_flush_input,
- hardwire_send_break,
- hardwire_raw,
- hardwire_get_tty_state,
- hardwire_set_tty_state,
- hardwire_print_tty_state,
- hardwire_noflush_set_tty_state,
- hardwire_setbaudrate,
- hardwire_setstopbits,
- hardwire_drain_output, /* wait for output to drain */
+int
+ser_unix_nop_drain_output (struct serial *scb)
+{
+ return 0;
+}
+
+
+\f
+/* Event handling for ASYNC serial code.
+
+ At any time the SERIAL device either: has an empty FIFO and is
+ waiting on a FD event; or has a non-empty FIFO/error condition and
+ is constantly scheduling timer events.
+
+ ASYNC only stops pestering its client when it is de-async'ed or it
+ is told to go away. */
+
+/* Value of scb->async_state: */
+enum {
+ /* >= 0 (TIMER_SCHEDULED) */
+ /* The ID of the currently scheduled timer event. This state is
+ rarely encountered. Timer events are one-off so as soon as the
+ event is delivered the state is shanged to NOTHING_SCHEDULED. */
+ FD_SCHEDULED = -1,
+ /* The fd_event() handler is scheduled. It is called when ever the
+ file descriptor becomes ready. */
+ NOTHING_SCHEDULED = -2
+ /* Either no task is scheduled (just going into ASYNC mode) or a
+ timer event has just gone off and the current state has been
+ forced into nothing scheduled. */
};
+/* Identify and schedule the next ASYNC task based on scb->async_state
+ and scb->buf* (the input FIFO). A state machine is used to avoid
+ the need to make redundant calls into the event-loop - the next
+ scheduled task is only changed when needed. */
+
+static void
+reschedule (struct serial *scb)
+{
+ if (serial_is_async_p (scb))
+ {
+ int next_state;
+ switch (scb->async_state)
+ {
+ case FD_SCHEDULED:
+ if (scb->bufcnt == 0)
+ next_state = FD_SCHEDULED;
+ else
+ {
+ delete_file_handler (scb->fd);
+ next_state = create_timer (0, push_event, scb);
+ }
+ break;
+ case NOTHING_SCHEDULED:
+ if (scb->bufcnt == 0)
+ {
+ add_file_handler (scb->fd, fd_event, scb);
+ next_state = FD_SCHEDULED;
+ }
+ else
+ {
+ next_state = create_timer (0, push_event, scb);
+ }
+ break;
+ default: /* TIMER SCHEDULED */
+ if (scb->bufcnt == 0)
+ {
+ delete_timer (scb->async_state);
+ add_file_handler (scb->fd, fd_event, scb);
+ next_state = FD_SCHEDULED;
+ }
+ else
+ next_state = scb->async_state;
+ break;
+ }
+ if (serial_debug_p (scb))
+ {
+ switch (next_state)
+ {
+ case FD_SCHEDULED:
+ if (scb->async_state != FD_SCHEDULED)
+ fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n",
+ scb->fd);
+ break;
+ default: /* TIMER SCHEDULED */
+ if (scb->async_state == FD_SCHEDULED)
+ fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n",
+ scb->fd);
+ break;
+ }
+ }
+ scb->async_state = next_state;
+ }
+}
+
+/* FD_EVENT: This is scheduled when the input FIFO is empty (and there
+ is no pending error). As soon as data arrives, it is read into the
+ input FIFO and the client notified. The client should then drain
+ the FIFO using readchar(). If the FIFO isn't immediatly emptied,
+ push_event() is used to nag the client until it is. */
+
+static void
+fd_event (int error, void *context)
+{
+ struct serial *scb = context;
+ if (error != 0)
+ {
+ scb->bufcnt = SERIAL_ERROR;
+ }
+ else if (scb->bufcnt == 0)
+ {
+ /* Prime the input FIFO. The readchar() function is used to
+ pull characters out of the buffer. See also
+ generic_readchar(). */
+ int nr;
+ do
+ {
+ nr = read (scb->fd, scb->buf, BUFSIZ);
+ }
+ while (nr == -1 && errno == EINTR);
+ if (nr == 0)
+ {
+ scb->bufcnt = SERIAL_EOF;
+ }
+ else if (nr > 0)
+ {
+ scb->bufcnt = nr;
+ scb->bufp = scb->buf;
+ }
+ else
+ {
+ scb->bufcnt = SERIAL_ERROR;
+ }
+ }
+ scb->async_handler (scb, scb->async_context);
+ reschedule (scb);
+}
+
+/* PUSH_EVENT: The input FIFO is non-empty (or there is a pending
+ error). Nag the client until all the data has been read. In the
+ case of errors, the client will need to close or de-async the
+ device before naging stops. */
+
+static void
+push_event (void *context)
+{
+ struct serial *scb = context;
+ scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */
+ scb->async_handler (scb, scb->async_context);
+ /* re-schedule */
+ reschedule (scb);
+}
+
+/* Put the SERIAL device into/out-of ASYNC mode. */
+
+void
+ser_unix_async (struct serial *scb,
+ int async_p)
+{
+ if (async_p)
+ {
+ /* Force a re-schedule. */
+ scb->async_state = NOTHING_SCHEDULED;
+ if (serial_debug_p (scb))
+ fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n",
+ scb->fd);
+ reschedule (scb);
+ }
+ else
+ {
+ if (serial_debug_p (scb))
+ fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n",
+ scb->fd);
+ /* De-schedule whatever tasks are currently scheduled. */
+ switch (scb->async_state)
+ {
+ case FD_SCHEDULED:
+ delete_file_handler (scb->fd);
+ break;
+ case NOTHING_SCHEDULED:
+ break;
+ default: /* TIMER SCHEDULED */
+ delete_timer (scb->async_state);
+ break;
+ }
+ }
+}
+
void
-_initialize_ser_hardwire ()
+_initialize_ser_hardwire (void)
{
- serial_add_interface (&hardwire_ops);
+ struct serial_ops *ops = XMALLOC (struct serial_ops);
+ memset (ops, 0, sizeof (struct serial_ops));
+ ops->name = "hardwire";
+ ops->next = 0;
+ ops->open = hardwire_open;
+ ops->close = hardwire_close;
+ /* FIXME: Don't replace this with the equivalent ser_unix*() until
+ the old TERMIOS/SGTTY/... timer code has been flushed. cagney
+ 1999-09-16. */
+ ops->readchar = hardwire_readchar;
+ ops->write = ser_unix_write;
+ ops->flush_output = hardwire_flush_output;
+ ops->flush_input = hardwire_flush_input;
+ ops->send_break = hardwire_send_break;
+ ops->go_raw = hardwire_raw;
+ ops->get_tty_state = hardwire_get_tty_state;
+ ops->set_tty_state = hardwire_set_tty_state;
+ ops->print_tty_state = hardwire_print_tty_state;
+ ops->noflush_set_tty_state = hardwire_noflush_set_tty_state;
+ ops->setbaudrate = hardwire_setbaudrate;
+ ops->setstopbits = hardwire_setstopbits;
+ ops->drain_output = hardwire_drain_output;
+ ops->async = ser_unix_async;
+ serial_add_interface (ops);
}
projects / binutils.git / blobdiff