* NEWS: Add entry for stdio gdbserver.
gdbserver/ * linux-low.c (linux_create_inferior): If stdio connection, redirect stdin from /dev/null, stdout to stderr. * remote-utils.c (remote_is_stdio): New static global. (remote_connection_is_stdio): New function. (remote_prepare): Handle stdio connection. (remote_open): Ditto. (remote_close): Don't close stdin for stdio connections. (read_prim,write_prim): New functions. Replace all calls to read/write to these. * server.c (main): Watch for "-" argument. Move call to remote_prepare before start_inferior. * server.h (STDIO_CONNECTION_NAME): New macro. (remote_connection_is_stdio): Declare. doc/ * gdb.texinfo (Server): Document -/stdio argument to gdbserver. testsuite/ * lib/gdbserver-support.exp (gdb_target_cmd): Recognize stdio gdbserver output. (gdbserver_default_get_remote_address): New function. (gdbserver_start): Call gdb,get_remote_address to compute argument to "target remote" command.
This commit is contained in:
Doug Evans
parent
e77616d77a
commit
e0f9f06220
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@ -1,3 +1,7 @@
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2011-12-16 Doug Evans <dje@google.com>
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* NEWS: Add entry for stdio gdbserver.
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2011-12-16 Phil Muldoon <pmuldoon@redhat.com>
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* python/python.c: Define python_excp_enums.
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3
gdb/NEWS
3
gdb/NEWS
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@ -3,6 +3,9 @@
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*** Changes since GDB 7.4
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* GDBserver now supports stdio connections.
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E.g. (gdb) target remote | ssh myhost gdbserver - hello
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*** Changes in GDB 7.4
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* GDB now handles ambiguous linespecs more consistently; the existing
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@ -1,3 +1,7 @@
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2011-12-16 Doug Evans <dje@google.com>
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* gdb.texinfo (Server): Document -/stdio argument to gdbserver.
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2011-12-16 Phil Muldoon <pmuldoon@redhat.com>
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* gdb.texinfo (Python Commands): Remove "maint set/show print
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@ -16766,8 +16766,10 @@ syntax is:
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target> gdbserver @var{comm} @var{program} [ @var{args} @dots{} ]
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@end smallexample
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@var{comm} is either a device name (to use a serial line) or a TCP
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hostname and portnumber. For example, to debug Emacs with the argument
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@var{comm} is either a device name (to use a serial line), or a TCP
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hostname and portnumber, or @code{-} or @code{stdio} to use
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stdin/stdout of @code{gdbserver}.
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For example, to debug Emacs with the argument
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@samp{foo.txt} and communicate with @value{GDBN} over the serial port
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@file{/dev/com1}:
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@ -16796,6 +16798,23 @@ conflicts with another service, @code{gdbserver} prints an error message
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and exits.} You must use the same port number with the host @value{GDBN}
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@code{target remote} command.
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The @code{stdio} connection is useful when starting @code{gdbserver}
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with ssh:
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@smallexample
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(gdb) target remote | ssh -T hostname gdbserver - hello
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@end smallexample
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The @samp{-T} option to ssh is provided because we don't need a remote pty,
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and we don't want escape-character handling. Ssh does this by default when
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a command is provided, the flag is provided to make it explicit.
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You could elide it if you want to.
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Programs started with stdio-connected gdbserver have @file{/dev/null} for
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@code{stdin}, and @code{stdout},@code{stderr} are sent back to gdb for
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display through a pipe connected to gdbserver.
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Both @code{stdout} and @code{stderr} use the same pipe.
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@subsubsection Attaching to a Running Program
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@cindex attach to a program, @code{gdbserver}
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@cindex @option{--attach}, @code{gdbserver} option
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@ -569,6 +569,18 @@ linux_create_inferior (char *program, char **allargs)
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setpgid (0, 0);
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/* If gdbserver is connected to gdb via stdio, redirect the inferior's
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stdout to stderr so that inferior i/o doesn't corrupt the connection.
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Also, redirect stdin to /dev/null. */
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if (remote_connection_is_stdio ())
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{
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close (0);
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open ("/dev/null", O_RDONLY);
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dup2 (2, 1);
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write (2, "stdin/stdout redirected\n",
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sizeof ("stdin/stdout redirected\n") - 1);
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}
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execv (program, allargs);
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if (errno == ENOENT)
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execvp (program, allargs);
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@ -107,6 +107,8 @@ struct sym_cache
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int remote_debug = 0;
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struct ui_file *gdb_stdlog;
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static int remote_is_stdio = 0;
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static gdb_fildes_t remote_desc = INVALID_DESCRIPTOR;
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static gdb_fildes_t listen_desc = INVALID_DESCRIPTOR;
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@ -130,6 +132,14 @@ gdb_connected (void)
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return remote_desc != INVALID_DESCRIPTOR;
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}
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/* Return true if the remote connection is over stdio. */
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int
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remote_connection_is_stdio (void)
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{
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return remote_is_stdio;
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}
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static void
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enable_async_notification (int fd)
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{
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@ -222,6 +232,17 @@ remote_prepare (char *name)
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socklen_t tmp;
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char *port_end;
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remote_is_stdio = 0;
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if (strcmp (name, STDIO_CONNECTION_NAME) == 0)
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{
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/* We need to record fact that we're using stdio sooner than the
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call to remote_open so start_inferior knows the connection is
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via stdio. */
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remote_is_stdio = 1;
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transport_is_reliable = 1;
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return;
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}
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port_str = strchr (name, ':');
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if (port_str == NULL)
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{
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@ -272,11 +293,27 @@ remote_open (char *name)
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char *port_str;
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port_str = strchr (name, ':');
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if (port_str == NULL)
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{
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#ifdef USE_WIN32API
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error ("Only <host>:<port> is supported on this platform.");
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#else
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if (port_str == NULL)
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error ("Only <host>:<port> is supported on this platform.");
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#endif
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if (strcmp (name, STDIO_CONNECTION_NAME) == 0)
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{
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fprintf (stderr, "Remote debugging using stdio\n");
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/* Use stdin as the handle of the connection.
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We only select on reads, for example. */
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remote_desc = fileno (stdin);
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enable_async_notification (remote_desc);
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/* Register the event loop handler. */
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add_file_handler (remote_desc, handle_serial_event, NULL);
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}
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#ifndef USE_WIN32API
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else if (port_str == NULL)
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{
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struct stat statbuf;
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if (stat (name, &statbuf) == 0
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@ -341,8 +378,8 @@ remote_open (char *name)
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/* Register the event loop handler. */
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add_file_handler (remote_desc, handle_serial_event, NULL);
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#endif /* USE_WIN32API */
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}
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#endif /* USE_WIN32API */
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else
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{
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int port;
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@ -372,7 +409,8 @@ remote_close (void)
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#ifdef USE_WIN32API
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closesocket (remote_desc);
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#else
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close (remote_desc);
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if (! remote_connection_is_stdio ())
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close (remote_desc);
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#endif
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remote_desc = INVALID_DESCRIPTOR;
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@ -731,6 +769,32 @@ read_ptid (char *buf, char **obuf)
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return ptid_build (pid, tid, 0);
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}
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/* Write COUNT bytes in BUF to the client.
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The result is the number of bytes written or -1 if error.
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This may return less than COUNT. */
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static int
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write_prim (const void *buf, int count)
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{
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if (remote_connection_is_stdio ())
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return write (fileno (stdout), buf, count);
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else
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return write (remote_desc, buf, count);
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}
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/* Read COUNT bytes from the client and store in BUF.
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The result is the number of bytes read or -1 if error.
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This may return less than COUNT. */
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static int
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read_prim (void *buf, int count)
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{
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if (remote_connection_is_stdio ())
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return read (fileno (stdin), buf, count);
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else
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return read (remote_desc, buf, count);
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}
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/* Send a packet to the remote machine, with error checking.
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The data of the packet is in BUF, and the length of the
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packet is in CNT. Returns >= 0 on success, -1 otherwise. */
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@ -768,7 +832,7 @@ putpkt_binary_1 (char *buf, int cnt, int is_notif)
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do
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{
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if (write (remote_desc, buf2, p - buf2) != p - buf2)
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if (write_prim (buf2, p - buf2) != p - buf2)
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{
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perror ("putpkt(write)");
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free (buf2);
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@ -863,7 +927,7 @@ input_interrupt (int unused)
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int cc;
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char c = 0;
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cc = read (remote_desc, &c, 1);
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cc = read_prim (&c, 1);
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if (cc != 1 || c != '\003' || current_inferior == NULL)
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{
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@ -991,8 +1055,7 @@ readchar (void)
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if (readchar_bufcnt == 0)
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{
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readchar_bufcnt = read (remote_desc, readchar_buf,
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sizeof (readchar_buf));
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readchar_bufcnt = read_prim (readchar_buf, sizeof (readchar_buf));
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if (readchar_bufcnt <= 0)
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{
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@ -1114,7 +1177,7 @@ getpkt (char *buf)
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fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
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(c1 << 4) + c2, csum, buf);
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if (write (remote_desc, "-", 1) != 1)
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if (write_prim ("-", 1) != 1)
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return -1;
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}
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@ -1126,7 +1189,7 @@ getpkt (char *buf)
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fflush (stderr);
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}
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if (write (remote_desc, "+", 1) != 1)
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if (write_prim ("+", 1) != 1)
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return -1;
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if (remote_debug)
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@ -2606,6 +2606,13 @@ main (int argc, char *argv[])
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}
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}
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}
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else if (strcmp (*next_arg, "-") == 0)
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{
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/* "-" specifies a stdio connection and is a form of port
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specification. */
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*next_arg = STDIO_CONNECTION_NAME;
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break;
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}
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else if (strcmp (*next_arg, "--disable-randomization") == 0)
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disable_randomization = 1;
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else if (strcmp (*next_arg, "--no-disable-randomization") == 0)
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@ -2636,6 +2643,12 @@ main (int argc, char *argv[])
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exit (1);
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}
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/* We need to know whether the remote connection is stdio before
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starting the inferior. Inferiors created in this scenario have
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stdin,stdout redirected. So do this here before we call
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start_inferior. */
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remote_prepare (port);
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bad_attach = 0;
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pid = 0;
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@ -2723,8 +2736,6 @@ main (int argc, char *argv[])
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exit (1);
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}
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remote_prepare (port);
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while (1)
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{
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noack_mode = 0;
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@ -342,6 +342,9 @@ extern int transport_is_reliable;
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int gdb_connected (void);
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#define STDIO_CONNECTION_NAME "stdio"
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int remote_connection_is_stdio (void);
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ptid_t read_ptid (char *buf, char **obuf);
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char *write_ptid (char *buf, ptid_t ptid);
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@ -1,3 +1,11 @@
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2011-12-16 Doug Evans <dje@google.com>
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* lib/gdbserver-support.exp (gdb_target_cmd): Recognize stdio
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gdbserver output.
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(gdbserver_default_get_remote_address): New function.
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(gdbserver_start): Call gdb,get_remote_address to compute argument
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to "target remote" command.
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2011-12-16 Phil Muldoon <pmuldoon@redhat.com>
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* gdb.python/py-function.exp: Change "on" to "full" for
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@ -70,6 +70,10 @@ proc gdb_target_cmd { targetname serialport } {
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verbose "Set target to $targetname"
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return 0
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}
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-re "Remote debugging using stdio.*$gdb_prompt $" {
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verbose "Set target to $targetname"
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return 0
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}
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-re "Remote target $targetname connected to.*$gdb_prompt $" {
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verbose "Set target to $targetname"
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return 0
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@ -183,6 +187,12 @@ proc gdbserver_download_current_prog { } {
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return $gdbserver_server_exec
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}
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# Default routine to compute the argument to "target remote".
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proc gdbserver_default_get_remote_address { host port } {
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return "$host$port"
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}
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# Start a gdbserver process with initial OPTIONS and trailing ARGUMENTS.
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# The port will be filled in between them automatically.
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#
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@ -206,6 +216,15 @@ proc gdbserver_start { options arguments } {
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set debughost "localhost:"
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}
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# Some boards use a different value for the port that is passed to
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# gdbserver and the port that is passed to the "target remote" command.
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# One example is the stdio gdbserver support.
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if [target_info exists gdb,get_remote_address] {
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set get_remote_address [target_info gdb,get_remote_address]
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} else {
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set get_remote_address gdbserver_default_get_remote_address
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}
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# Extract the protocol
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if [target_info exists gdb_protocol] {
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set protocol [target_info gdb_protocol]
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@ -217,9 +236,6 @@ proc gdbserver_start { options arguments } {
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# Loop till we find a free port.
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while 1 {
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# Export the host:port pair.
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set gdbport $debughost$portnum
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# Fire off the debug agent.
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set gdbserver_command "$gdbserver"
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@ -235,9 +251,9 @@ proc gdbserver_start { options arguments } {
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if { $options != "" } {
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append gdbserver_command " $options"
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}
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append gdbserver_command " :$portnum"
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if { $portnum != "" } {
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append gdbserver_command " :$portnum"
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}
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if { $arguments != "" } {
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append gdbserver_command " $arguments"
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}
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@ -275,7 +291,7 @@ proc gdbserver_start { options arguments } {
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}
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}
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return [list $protocol $gdbport]
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return [list $protocol [$get_remote_address $debughost $portnum]]
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}
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# Start a gdbserver process running SERVER_EXEC, and connect GDB
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Loading…
Reference in New Issue