binutils-gdb/gdb/serial.c

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/* Generic serial interface routines
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Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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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. */
#include "defs.h"
#include <ctype.h>
#include "serial.h"
#include "gdb_string.h"
#include "gdbcmd.h"
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extern void _initialize_serial (void);
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/* Is serial being debugged? */
static int global_serial_debug_p;
/* Linked list of serial I/O handlers */
static struct serial_ops *serial_ops_list = NULL;
/* This is the last serial stream opened. Used by connect command. */
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static struct serial *last_serial_opened = NULL;
/* Pointer to list of scb's. */
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static struct serial *scb_base;
/* Non-NULL gives filename which contains a recording of the remote session,
suitable for playback by gdbserver. */
static char *serial_logfile = NULL;
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static struct ui_file *serial_logfp = NULL;
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static struct serial_ops *serial_interface_lookup (char *);
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static void serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout);
static const char logbase_hex[] = "hex";
static const char logbase_octal[] = "octal";
static const char logbase_ascii[] = "ascii";
static const char *logbase_enums[] =
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{logbase_hex, logbase_octal, logbase_ascii, NULL};
static const char *serial_logbase = logbase_ascii;
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#undef XMALLOC
#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
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static int serial_current_type = 0;
/* Log char CH of type CHTYPE, with TIMEOUT */
/* Define bogus char to represent a BREAK. Should be careful to choose a value
that can't be confused with a normal char, or an error code. */
#define SERIAL_BREAK 1235
static void
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serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
{
if (ch_type != serial_current_type)
{
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fprintf_unfiltered (stream, "\n%c ", ch_type);
serial_current_type = ch_type;
}
if (serial_logbase != logbase_ascii)
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fputc_unfiltered (' ', stream);
switch (ch)
{
case SERIAL_TIMEOUT:
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fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
return;
case SERIAL_ERROR:
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fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
return;
case SERIAL_EOF:
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fputs_unfiltered ("<Eof>", stream);
return;
case SERIAL_BREAK:
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fputs_unfiltered ("<Break>", stream);
return;
default:
if (serial_logbase == logbase_hex)
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fprintf_unfiltered (stream, "%02x", ch & 0xff);
else if (serial_logbase == logbase_octal)
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fprintf_unfiltered (stream, "%03o", ch & 0xff);
else
switch (ch)
{
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case '\\':
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fputs_unfiltered ("\\\\", stream);
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break;
case '\b':
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fputs_unfiltered ("\\b", stream);
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break;
case '\f':
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fputs_unfiltered ("\\f", stream);
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break;
case '\n':
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fputs_unfiltered ("\\n", stream);
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break;
case '\r':
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fputs_unfiltered ("\\r", stream);
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break;
case '\t':
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fputs_unfiltered ("\\t", stream);
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break;
case '\v':
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fputs_unfiltered ("\\v", stream);
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break;
default:
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fprintf_unfiltered (stream, isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
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break;
}
}
}
void
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serial_log_command (const char *cmd)
{
if (!serial_logfp)
return;
serial_current_type = 'c';
fputs_unfiltered ("\nc ", serial_logfp);
fputs_unfiltered (cmd, serial_logfp);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
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static struct serial_ops *
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serial_interface_lookup (char *name)
{
struct serial_ops *ops;
for (ops = serial_ops_list; ops; ops = ops->next)
if (strcmp (name, ops->name) == 0)
return ops;
return NULL;
}
void
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serial_add_interface (struct serial_ops *optable)
{
optable->next = serial_ops_list;
serial_ops_list = optable;
}
/* Open up a device or a network socket, depending upon the syntax of NAME. */
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struct serial *
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serial_open (const char *name)
{
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struct serial *scb;
struct serial_ops *ops;
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const char *open_name = name;
for (scb = scb_base; scb; scb = scb->next)
if (scb->name && strcmp (scb->name, name) == 0)
{
scb->refcnt++;
return scb;
}
if (strcmp (name, "ocd") == 0)
ops = serial_interface_lookup ("ocd");
else if (strcmp (name, "pc") == 0)
ops = serial_interface_lookup ("pc");
else if (strchr (name, ':'))
ops = serial_interface_lookup ("tcp");
else if (strncmp (name, "lpt", 3) == 0)
ops = serial_interface_lookup ("parallel");
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else if (strncmp (name, "|", 1) == 0)
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{
ops = serial_interface_lookup ("pipe");
open_name = name + 1; /* discard ``|'' */
}
else
ops = serial_interface_lookup ("hardwire");
if (!ops)
return NULL;
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scb = XMALLOC (struct serial);
scb->ops = ops;
scb->bufcnt = 0;
scb->bufp = scb->buf;
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if (scb->ops->open (scb, open_name))
{
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xfree (scb);
return NULL;
}
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scb->name = xstrdup (name);
scb->next = scb_base;
scb->refcnt = 1;
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scb->debug_p = 0;
scb->async_state = 0;
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scb->async_handler = NULL;
scb->async_context = NULL;
scb_base = scb;
last_serial_opened = scb;
if (serial_logfile != NULL)
{
serial_logfp = gdb_fopen (serial_logfile, "w");
if (serial_logfp == NULL)
perror_with_name (serial_logfile);
}
return scb;
}
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struct serial *
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serial_fdopen (const int fd)
{
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struct serial *scb;
struct serial_ops *ops;
for (scb = scb_base; scb; scb = scb->next)
if (scb->fd == fd)
{
scb->refcnt++;
return scb;
}
ops = serial_interface_lookup ("hardwire");
if (!ops)
return NULL;
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scb = XMALLOC (struct serial);
scb->ops = ops;
scb->bufcnt = 0;
scb->bufp = scb->buf;
scb->fd = fd;
scb->name = NULL;
scb->next = scb_base;
scb->refcnt = 1;
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scb->debug_p = 0;
scb->async_state = 0;
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scb->async_handler = NULL;
scb->async_context = NULL;
scb_base = scb;
last_serial_opened = scb;
return scb;
}
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static void
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do_serial_close (struct serial *scb, int really_close)
{
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struct serial *tmp_scb;
last_serial_opened = NULL;
if (serial_logfp)
{
fputs_unfiltered ("\nEnd of log\n", serial_logfp);
serial_current_type = 0;
/* XXX - What if serial_logfp == gdb_stdout or gdb_stderr? */
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ui_file_delete (serial_logfp);
serial_logfp = NULL;
}
/* This is bogus. It's not our fault if you pass us a bad scb...! Rob, you
should fix your code instead. */
if (!scb)
return;
scb->refcnt--;
if (scb->refcnt > 0)
return;
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/* ensure that the FD has been taken out of async mode */
if (scb->async_handler != NULL)
serial_async (scb, NULL, NULL);
if (really_close)
scb->ops->close (scb);
if (scb->name)
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xfree (scb->name);
if (scb_base == scb)
scb_base = scb_base->next;
else
for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
{
if (tmp_scb->next != scb)
continue;
tmp_scb->next = tmp_scb->next->next;
break;
}
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xfree (scb);
}
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void
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serial_close (struct serial *scb)
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{
do_serial_close (scb, 1);
}
void
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serial_un_fdopen (struct serial *scb)
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{
do_serial_close (scb, 0);
}
int
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serial_readchar (struct serial *scb, int timeout)
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{
int ch;
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/* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
code is finished. */
if (0 && serial_is_async_p (scb) && timeout < 0)
internal_error (__FILE__, __LINE__,
"serial_readchar: blocking read in async mode");
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ch = scb->ops->readchar (scb, timeout);
if (serial_logfp != NULL)
{
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serial_logchar (serial_logfp, 'r', ch, timeout);
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/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
if (serial_debug_p (scb))
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{
fprintf_unfiltered (gdb_stdlog, "[");
serial_logchar (gdb_stdlog, 'r', ch, timeout);
fprintf_unfiltered (gdb_stdlog, "]");
gdb_flush (gdb_stdlog);
}
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return (ch);
}
int
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serial_write (struct serial *scb, const char *str, int len)
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{
if (serial_logfp != NULL)
{
int count;
for (count = 0; count < len; count++)
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serial_logchar (serial_logfp, 'w', str[count] & 0xff, 0);
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/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
return (scb->ops->write (scb, str, len));
}
void
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serial_printf (struct serial *desc, const char *format,...)
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{
va_list args;
char *buf;
va_start (args, format);
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xvasprintf (&buf, format, args);
serial_write (desc, buf, strlen (buf));
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xfree (buf);
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va_end (args);
}
int
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serial_drain_output (struct serial *scb)
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{
return scb->ops->drain_output (scb);
}
int
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serial_flush_output (struct serial *scb)
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{
return scb->ops->flush_output (scb);
}
int
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serial_flush_input (struct serial *scb)
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{
return scb->ops->flush_input (scb);
}
int
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serial_send_break (struct serial *scb)
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{
if (serial_logfp != NULL)
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serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
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return (scb->ops->send_break (scb));
}
void
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serial_raw (struct serial *scb)
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{
scb->ops->go_raw (scb);
}
serial_ttystate
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serial_get_tty_state (struct serial *scb)
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{
return scb->ops->get_tty_state (scb);
}
int
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serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
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{
return scb->ops->set_tty_state (scb, ttystate);
}
void
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serial_print_tty_state (struct serial *scb,
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serial_ttystate ttystate,
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struct ui_file *stream)
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{
scb->ops->print_tty_state (scb, ttystate, stream);
}
int
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serial_noflush_set_tty_state (struct serial *scb,
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serial_ttystate new_ttystate,
serial_ttystate old_ttystate)
{
return scb->ops->noflush_set_tty_state (scb, new_ttystate, old_ttystate);
}
int
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serial_setbaudrate (struct serial *scb, int rate)
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{
return scb->ops->setbaudrate (scb, rate);
}
int
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serial_setstopbits (struct serial *scb, int num)
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{
return scb->ops->setstopbits (scb, num);
}
int
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serial_can_async_p (struct serial *scb)
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{
return (scb->ops->async != NULL);
}
int
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serial_is_async_p (struct serial *scb)
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{
return (scb->ops->async != NULL) && (scb->async_handler != NULL);
}
void
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serial_async (struct serial *scb,
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serial_event_ftype *handler,
void *context)
{
/* Only change mode if there is a need. */
if ((scb->async_handler == NULL)
!= (handler == NULL))
scb->ops->async (scb, handler != NULL);
scb->async_handler = handler;
scb->async_context = context;
}
int
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deprecated_serial_fd (struct serial *scb)
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{
/* FIXME: should this output a warning that deprecated code is being
called? */
if (scb->fd < 0)
{
internal_error (__FILE__, __LINE__,
"serial: FD not valid");
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}
return scb->fd; /* sigh */
}
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void
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serial_debug (struct serial *scb, int debug_p)
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{
scb->debug_p = debug_p;
}
int
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serial_debug_p (struct serial *scb)
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{
return scb->debug_p || global_serial_debug_p;
}
#if 0
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/* The connect command is #if 0 because I hadn't thought of an elegant
way to wait for I/O on two `struct serial *'s simultaneously. Two
solutions came to mind:
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1) Fork, and have have one fork handle the to user direction,
and have the other hand the to target direction. This
obviously won't cut it for MSDOS.
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2) Use something like select. This assumes that stdin and
the target side can both be waited on via the same
mechanism. This may not be true for DOS, if GDB is
talking to the target via a TCP socket.
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-grossman, 8 Jun 93 */
/* Connect the user directly to the remote system. This command acts just like
the 'cu' or 'tip' command. Use <CR>~. or <CR>~^D to break out. */
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static struct serial *tty_desc; /* Controlling terminal */
static void
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cleanup_tty (serial_ttystate ttystate)
{
printf_unfiltered ("\r\n[Exiting connect mode]\r\n");
serial_set_tty_state (tty_desc, ttystate);
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xfree (ttystate);
serial_close (tty_desc);
}
static void
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connect_command (char *args, int fromtty)
{
int c;
char cur_esc = 0;
serial_ttystate ttystate;
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struct serial *port_desc; /* TTY port */
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dont_repeat ();
if (args)
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fprintf_unfiltered (gdb_stderr, "This command takes no args. They have been ignored.\n");
printf_unfiltered ("[Entering connect mode. Use ~. or ~^D to escape]\n");
tty_desc = serial_fdopen (0);
port_desc = last_serial_opened;
ttystate = serial_get_tty_state (tty_desc);
serial_raw (tty_desc);
serial_raw (port_desc);
make_cleanup (cleanup_tty, ttystate);
while (1)
{
int mask;
mask = serial_wait_2 (tty_desc, port_desc, -1);
if (mask & 2)
{ /* tty input */
char cx;
while (1)
{
c = serial_readchar (tty_desc, 0);
if (c == SERIAL_TIMEOUT)
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break;
if (c < 0)
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perror_with_name ("connect");
cx = c;
serial_write (port_desc, &cx, 1);
switch (cur_esc)
{
case 0:
if (c == '\r')
cur_esc = c;
break;
case '\r':
if (c == '~')
cur_esc = c;
else
cur_esc = 0;
break;
case '~':
if (c == '.' || c == '\004')
return;
else
cur_esc = 0;
}
}
}
if (mask & 1)
{ /* Port input */
char cx;
while (1)
{
c = serial_readchar (port_desc, 0);
if (c == SERIAL_TIMEOUT)
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break;
if (c < 0)
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perror_with_name ("connect");
cx = c;
serial_write (tty_desc, &cx, 1);
}
}
}
}
#endif /* 0 */
void
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_initialize_serial (void)
{
#if 0
add_com ("connect", class_obscure, connect_command,
"Connect the terminal directly up to the command monitor.\n\
Use <CR>~. or <CR>~^D to break out.");
#endif /* 0 */
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add_show_from_set
(add_set_cmd ("remotelogfile", no_class,
var_filename, (char *) &serial_logfile,
"Set filename for remote session recording.\n\
This file is used to record the remote session for future playback\n\
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by gdbserver.",
&setlist),
&showlist);
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add_show_from_set
(add_set_enum_cmd ("remotelogbase", no_class,
logbase_enums, &serial_logbase,
"Set numerical base for remote session logging",
&setlist),
&showlist);
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add_show_from_set (add_set_cmd ("serial",
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class_maintenance,
var_zinteger,
(char *)&global_serial_debug_p,
"Set serial debugging.\n\
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When non-zero, serial port debugging is enabled.", &setdebuglist),
&showdebuglist);
}