/* Serial interface for raw TCP connections on Un*x like systems.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006,
+ 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GDB.
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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "serial.h"
#include "ser-base.h"
#include "ser-tcp.h"
+#include "gdbcmd.h"
+#include "cli/cli-decode.h"
+#include "cli/cli-setshow.h"
#include <sys/types.h>
#include <signal.h>
#include "gdb_string.h"
+#include "gdb_select.h"
#ifndef HAVE_SOCKLEN_T
typedef int socklen_t;
void _initialize_ser_tcp (void);
-/* seconds to wait for connect */
-#define TIMEOUT 15
+/* For "set tcp" and "show tcp". */
+
+static struct cmd_list_element *tcp_set_cmdlist;
+static struct cmd_list_element *tcp_show_cmdlist;
+
+/* Whether to auto-retry refused connections. */
+
+static int tcp_auto_retry = 1;
+
+/* Timeout period for connections, in seconds. */
+
+static int tcp_retry_limit = 15;
+
/* how many times per second to poll deprecated_ui_loop_hook */
-#define POLL_INTERVAL 2
+
+#define POLL_INTERVAL 5
+
+/* Helper function to wait a while. If SCB is non-null, wait on its
+ file descriptor. Otherwise just wait on a timeout, updating *POLLS.
+ Returns -1 on timeout or interrupt, otherwise the value of select. */
+
+static int
+wait_for_connect (struct serial *scb, int *polls)
+{
+ struct timeval t;
+ int n;
+
+ /* While we wait for the connect to complete,
+ poll the UI so it can update or the user can
+ interrupt. */
+ if (deprecated_ui_loop_hook && deprecated_ui_loop_hook (0))
+ {
+ errno = EINTR;
+ return -1;
+ }
+
+ /* Check for timeout. */
+ if (*polls > tcp_retry_limit * POLL_INTERVAL)
+ {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+
+ /* Back off to polling once per second after the first POLL_INTERVAL
+ polls. */
+ if (*polls < POLL_INTERVAL)
+ {
+ t.tv_sec = 0;
+ t.tv_usec = 1000000 / POLL_INTERVAL;
+ }
+ else
+ {
+ t.tv_sec = 1;
+ t.tv_usec = 0;
+ }
+
+ if (scb)
+ {
+ fd_set rset, wset, eset;
+ FD_ZERO (&rset);
+ FD_SET (scb->fd, &rset);
+ wset = rset;
+ eset = rset;
+
+ /* POSIX systems return connection success or failure by signalling
+ wset. Windows systems return success in wset and failure in
+ eset.
+
+ We must call select here, rather than gdb_select, because
+ the serial structure has not yet been initialized - the
+ MinGW select wrapper will not know that this FD refers
+ to a socket. */
+ n = select (scb->fd + 1, &rset, &wset, &eset, &t);
+ }
+ else
+ /* Use gdb_select here, since we have no file descriptors, and on
+ Windows, plain select doesn't work in that case. */
+ n = gdb_select (0, NULL, NULL, NULL, &t);
+
+ /* If we didn't time out, only count it as one poll. */
+ if (n > 0 || *polls < POLL_INTERVAL)
+ (*polls)++;
+ else
+ (*polls) += POLL_INTERVAL;
+
+ return n;
+}
/* Open a tcp socket */
#else
int ioarg;
#endif
+ int polls = 0;
use_udp = 0;
if (strncmp (name, "udp:", 4) == 0)
return -1;
}
+ sockaddr.sin_family = PF_INET;
+ sockaddr.sin_port = htons (port);
+ memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
+ sizeof (struct in_addr));
+
+ retry:
+
if (use_udp)
scb->fd = socket (PF_INET, SOCK_DGRAM, 0);
else
if (scb->fd < 0)
return -1;
- sockaddr.sin_family = PF_INET;
- sockaddr.sin_port = htons (port);
- memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
- sizeof (struct in_addr));
-
/* set socket nonblocking */
ioarg = 1;
ioctl (scb->fd, FIONBIO, &ioarg);
/* Use Non-blocking connect. connect() will return 0 if connected already. */
n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));
- if (n < 0
+ if (n < 0)
+ {
#ifdef USE_WIN32API
- /* Under Windows, calling "connect" with a non-blocking socket
- results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */
- && WSAGetLastError() != WSAEWOULDBLOCK
+ int err = WSAGetLastError();
#else
- && errno != EINPROGRESS
+ int err = errno;
#endif
- )
- {
+
+ /* Maybe we're waiting for the remote target to become ready to
+ accept connections. */
+ if (tcp_auto_retry
#ifdef USE_WIN32API
- errno = WSAGetLastError();
+ && err == WSAECONNREFUSED
+#else
+ && err == ECONNREFUSED
#endif
- net_close (scb);
- return -1;
- }
+ && wait_for_connect (NULL, &polls) >= 0)
+ {
+ close (scb->fd);
+ goto retry;
+ }
- if (n)
- {
- /* looks like we need to wait for the connect */
- struct timeval t;
- fd_set rset, wset, eset;
- int polls = 0;
- FD_ZERO (&rset);
+ if (
+#ifdef USE_WIN32API
+ /* Under Windows, calling "connect" with a non-blocking socket
+ results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */
+ err != WSAEWOULDBLOCK
+#else
+ err != EINPROGRESS
+#endif
+ )
+ {
+ errno = err;
+ net_close (scb);
+ return -1;
+ }
+ /* looks like we need to wait for the connect */
do
{
- /* While we wait for the connect to complete,
- poll the UI so it can update or the user can
- interrupt. */
- if (deprecated_ui_loop_hook)
- {
- if (deprecated_ui_loop_hook (0))
- {
- errno = EINTR;
- net_close (scb);
- return -1;
- }
- }
-
- FD_SET (scb->fd, &rset);
- wset = rset;
- eset = rset;
- t.tv_sec = 0;
- t.tv_usec = 1000000 / POLL_INTERVAL;
-
- /* POSIX systems return connection success or failure by signalling
- wset. Windows systems return success in wset and failure in
- eset.
-
- We must call select here, rather than gdb_select, because
- the serial structure has not yet been initialized - the
- MinGW select wrapper will not know that this FD refers
- to a socket. */
- n = select (scb->fd + 1, &rset, &wset, &eset, &t);
- polls++;
+ n = wait_for_connect (scb, &polls);
}
- while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL);
- if (n < 0 || polls > TIMEOUT * POLL_INTERVAL)
+ while (n == 0);
+ if (n < 0)
{
- if (polls > TIMEOUT * POLL_INTERVAL)
- errno = ETIMEDOUT;
net_close (scb);
return -1;
}
res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len);
if (res < 0 || err)
{
+ /* Maybe the target still isn't ready to accept the connection. */
+ if (tcp_auto_retry
+#ifdef USE_WIN32API
+ && err == WSAECONNREFUSED
+#else
+ && err == ECONNREFUSED
+#endif
+ && wait_for_connect (NULL, &polls) >= 0)
+ {
+ close (scb->fd);
+ goto retry;
+ }
if (err)
errno = err;
net_close (scb);
return send (scb->fd, buf, count, 0);
}
+int
+ser_tcp_send_break (struct serial *scb)
+{
+ /* Send telnet IAC and BREAK characters. */
+ return (serial_write (scb, "\377\363", 2));
+}
+
+/* Support for "set tcp" and "show tcp" commands. */
+
+static void
+set_tcp_cmd (char *args, int from_tty)
+{
+ help_list (tcp_set_cmdlist, "set tcp ", -1, gdb_stdout);
+}
+
+static void
+show_tcp_cmd (char *args, int from_tty)
+{
+ help_list (tcp_show_cmdlist, "show tcp ", -1, gdb_stdout);
+}
+
+
void
_initialize_ser_tcp (void)
{
#ifdef USE_WIN32API
/* Do nothing; the TCP serial operations will be initialized in
ser-mingw.c. */
- return;
#else
struct serial_ops *ops;
ops = XMALLOC (struct serial_ops);
ops->write = ser_base_write;
ops->flush_output = ser_base_flush_output;
ops->flush_input = ser_base_flush_input;
- ops->send_break = ser_base_send_break;
+ ops->send_break = ser_tcp_send_break;
ops->go_raw = ser_base_raw;
ops->get_tty_state = ser_base_get_tty_state;
ops->set_tty_state = ser_base_set_tty_state;
ops->write_prim = net_write_prim;
serial_add_interface (ops);
#endif /* USE_WIN32API */
+
+ add_prefix_cmd ("tcp", class_maintenance, set_tcp_cmd, _("\
+TCP protocol specific variables\n\
+Configure variables specific to remote TCP connections"),
+ &tcp_set_cmdlist, "set tcp ",
+ 0 /* allow-unknown */, &setlist);
+ add_prefix_cmd ("tcp", class_maintenance, show_tcp_cmd, _("\
+TCP protocol specific variables\n\
+Configure variables specific to remote TCP connections"),
+ &tcp_show_cmdlist, "show tcp ",
+ 0 /* allow-unknown */, &showlist);
+
+ add_setshow_boolean_cmd ("auto-retry", class_obscure,
+ &tcp_auto_retry, _("\
+Set auto-retry on socket connect"), _("\
+Show auto-retry on socket connect"),
+ NULL, NULL, NULL,
+ &tcp_set_cmdlist, &tcp_show_cmdlist);
+
+ add_setshow_uinteger_cmd ("connect-timeout", class_obscure,
+ &tcp_retry_limit, _("\
+Set timeout limit for socket connection"), _("\
+Show timeout limit for socket connection"),
+ NULL, NULL, NULL,
+ &tcp_set_cmdlist, &tcp_show_cmdlist);
}
projects / deliverable / binutils-gdb.git / blobdiff