/* Serial interface for local (hardwired) serial ports on Un*x like systems
- Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
- 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2003,
+ 2004, 2005, 2007 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "serial.h"
#include <sys/socket.h>
#include <sys/time.h>
+#include "gdb_select.h"
#include "gdb_string.h"
+#include "gdbcmd.h"
#ifdef HAVE_TERMIOS
{
struct termios termios;
};
+
+#ifdef CRTSCTS
+/* Boolean to explicitly enable or disable h/w flow control. */
+static int serial_hwflow;
+static void
+show_serial_hwflow (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Hardware flow control is %s.\n"), value);
+}
+#endif
+
#endif /* termios */
#ifdef HAVE_TERMIO
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
hardwire_flush_input (struct serial *scb)
{
- ser_unix_flush_input (scb);
+ ser_base_flush_input (scb);
#ifdef HAVE_TERMIOS
return tcflush (scb->fd, TCIFLUSH);
the full length of time. I think that is OK. */
timeout.tv_sec = 0;
timeout.tv_usec = 250000;
- select (0, 0, 0, 0, &timeout);
+ gdb_select (0, 0, 0, 0, &timeout);
status = ioctl (scb->fd, TIOCCBRK, 0);
return status;
}
state.termios.c_lflag = 0;
state.termios.c_cflag &= ~(CSIZE | PARENB);
state.termios.c_cflag |= CLOCAL | CS8;
+#ifdef CRTSCTS
+ /* h/w flow control. */
+ if (serial_hwflow)
+ state.termios.c_cflag |= CRTSCTS;
+ else
+ state.termios.c_cflag &= ~CRTSCTS;
+#ifdef CRTS_IFLOW
+ if (serial_hwflow)
+ state.termios.c_cflag |= CRTS_IFLOW;
+ else
+ state.termios.c_cflag &= ~CRTS_IFLOW;
+#endif
+#endif
state.termios.c_cc[VMIN] = 0;
state.termios.c_cc[VTIME] = 0;
#endif
*/
/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
- ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
+ ser_base*() until the old TERMIOS/SGTTY/... timer code has been
flushed. . */
/* NOTE: cagney/1999-09-30: Much of the code below is dead. The only
FD_SET (scb->fd, &readfds);
if (timeout >= 0)
- numfds = select (scb->fd + 1, &readfds, 0, 0, &tv);
+ numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, &tv);
else
- numfds = select (scb->fd + 1, &readfds, 0, 0, 0);
+ numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, 0);
if (numfds <= 0)
if (numfds == 0)
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
+ ser_base*() 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*()
+ ser_base_readchar() as part of replacing it with ser_base*()
merging will be required - this code handles the case where read()
- times out due to no data while ser_unix_readchar() doesn't expect
+ times out due to no data while ser_base_readchar() doesn't expect
that. */
static int
close (scb->fd);
scb->fd = -1;
}
-
\f
-/* Wait for input on scb, with timeout seconds. Returns 0 on success,
- otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */
-
-static 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
-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
- deprecated_ui_loop_hook signals that we should exit by
- returning 1. */
-
- if (deprecated_ui_loop_hook)
- {
- if (deprecated_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);
-}
\f
void
_initialize_ser_hardwire (void)
ops->next = 0;
ops->open = hardwire_open;
ops->close = hardwire_close;
- /* FIXME: Don't replace this with the equivalent ser_unix*() until
+ /* FIXME: Don't replace this with the equivalent ser_base*() until
the old TERMIOS/SGTTY/... timer code has been flushed. cagney
1999-09-16. */
ops->readchar = hardwire_readchar;
- ops->write = ser_unix_write;
+ ops->write = ser_base_write;
ops->flush_output = hardwire_flush_output;
ops->flush_input = hardwire_flush_input;
ops->send_break = hardwire_send_break;
ops->setbaudrate = hardwire_setbaudrate;
ops->setstopbits = hardwire_setstopbits;
ops->drain_output = hardwire_drain_output;
- ops->async = ser_unix_async;
+ ops->async = ser_base_async;
+ ops->read_prim = ser_unix_read_prim;
+ ops->write_prim = ser_unix_write_prim;
serial_add_interface (ops);
+
+#ifdef HAVE_TERMIOS
+#ifdef CRTSCTS
+ add_setshow_boolean_cmd ("remoteflow", no_class,
+ &serial_hwflow, _("\
+Set use of hardware flow control for remote serial I/O."), _("\
+Show use of hardware flow control for remote serial I/O."), _("\
+Enable or disable hardware flow control (RTS/CTS) on the serial port\n\
+when debugging using remote targets."),
+ NULL,
+ show_serial_hwflow,
+ &setlist, &showlist);
+#endif
+#endif
+}
+
+int
+ser_unix_read_prim (struct serial *scb, size_t count)
+{
+ int status;
+
+ while (1)
+ {
+ status = read (scb->fd, scb->buf, count);
+ if (status != -1 || errno != EINTR)
+ break;
+ }
+ return status;
+}
+
+int
+ser_unix_write_prim (struct serial *scb, const void *buf, size_t len)
+{
+ /* ??? Historically, GDB has not retried calls to "write" that
+ result in EINTR. */
+ return write (scb->fd, buf, len);
}