extended-remote}. This should be set to a filename valid on the
target system. If it is not set, the target will use a default
filename (e.g.@: the last program run).
+
+@kindex set tcp
+@kindex show tcp
+@item set tcp auto-retry on
+@cindex auto-retry, for remote TCP target
+Enable auto-retry for remote TCP connections. This is useful if the remote
+debugging agent is launched in parallel with @value{GDBN}; there is a race
+condition because the agent may not become ready to accept the connection
+before @value{GDBN} attempts to connect. When auto-retry is
+enabled, if the initial attempt to connect fails, @value{GDBN} reattempts
+to establish the connection using the timeout specified by
+@code{set tcp connect-timeout}.
+
+@item set tcp auto-retry off
+Do not auto-retry failed TCP connections.
+
+@item show tcp auto-retry
+Show the current auto-retry setting.
+
+@item set tcp connect-timeout @var{seconds}
+@cindex connection timeout, for remote TCP target
+@cindex timeout, for remote target connection
+Set the timeout for establishing a TCP connection to the remote target to
+@var{seconds}. The timeout affects both polling to retry failed connections
+(enabled by @code{set tcp auto-retry on}) and waiting for connections
+that are merely slow to complete, and represents an approximate cumulative
+value.
+
+@item show tcp connect-timeout
+Show the current connection timeout setting.
@end table
@cindex remote packets, enabling and disabling
#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 (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_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 / commitdiff
