1 /* Serial interface for raw TCP connections on Un*x like systems
2 Copyright 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #include <sys/types.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
27 #include <sys/socket.h>
28 #include <netinet/tcp.h>
36 static int tcp_open
PARAMS ((serial_t scb
, const char *name
));
37 static void tcp_raw
PARAMS ((serial_t scb
));
38 static int wait_for
PARAMS ((serial_t scb
, int timeout
));
39 static int tcp_readchar
PARAMS ((serial_t scb
, int timeout
));
40 static int tcp_setbaudrate
PARAMS ((serial_t scb
, int rate
));
41 static int tcp_setstopbits
PARAMS ((serial_t scb
, int num
));
42 static int tcp_write
PARAMS ((serial_t scb
, const char *str
, int len
));
43 /* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
44 static void tcp_close
PARAMS ((serial_t scb
));
45 static serial_ttystate tcp_get_tty_state
PARAMS ((serial_t scb
));
46 static int tcp_set_tty_state
PARAMS ((serial_t scb
, serial_ttystate state
));
48 /* Open up a raw tcp socket */
57 struct hostent
*hostent
;
58 struct sockaddr_in sockaddr
;
61 struct protoent
*protoent
;
64 port_str
= strchr (name
, ':');
67 error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
69 tmp
= min (port_str
- name
, sizeof hostname
- 1);
70 strncpy (hostname
, name
, tmp
); /* Don't want colon */
71 hostname
[tmp
] = '\000'; /* Tie off host name */
72 port
= atoi (port_str
+ 1);
74 hostent
= gethostbyname (hostname
);
78 fprintf_unfiltered (gdb_stderr
, "%s: unknown host\n", hostname
);
83 for (i
= 1; i
<= 15; i
++)
85 scb
->fd
= socket (PF_INET
, SOCK_STREAM
, 0);
89 /* Allow rapid reuse of this port. */
91 setsockopt (scb
->fd
, SOL_SOCKET
, SO_REUSEADDR
, (char *)&tmp
, sizeof(tmp
));
93 /* Enable TCP keep alive process. */
95 setsockopt (scb
->fd
, SOL_SOCKET
, SO_KEEPALIVE
, (char *)&tmp
, sizeof(tmp
));
97 sockaddr
.sin_family
= PF_INET
;
98 sockaddr
.sin_port
= htons(port
);
99 memcpy (&sockaddr
.sin_addr
.s_addr
, hostent
->h_addr
,
100 sizeof (struct in_addr
));
102 if (!connect (scb
->fd
, (struct sockaddr
*) &sockaddr
, sizeof(sockaddr
)))
108 /* We retry for ECONNREFUSED because that is often a temporary condition, which
109 happens when the server is being restarted. */
111 if (errno
!= ECONNREFUSED
)
117 protoent
= getprotobyname ("tcp");
122 if (setsockopt (scb
->fd
, protoent
->p_proto
, TCP_NODELAY
,
123 (char *)&tmp
, sizeof(tmp
)))
126 signal(SIGPIPE
, SIG_IGN
); /* If we don't do this, then GDB simply exits
127 when the remote side dies. */
132 static serial_ttystate
133 tcp_get_tty_state(scb
)
136 struct tcp_ttystate
*state
;
138 state
= (struct tcp_ttystate
*)xmalloc(sizeof *state
);
140 return (serial_ttystate
)state
;
144 tcp_set_tty_state(scb
, ttystate
)
146 serial_ttystate ttystate
;
148 struct tcp_ttystate
*state
;
150 state
= (struct tcp_ttystate
*)ttystate
;
166 return; /* Always in raw mode */
169 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
170 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
172 For termio{s}, we actually just setup VTIME if necessary, and let the
173 timeout occur in the read() in tcp_read().
177 wait_for(scb
, timeout
)
183 fd_set readfds
, exceptfds
;
186 FD_ZERO (&exceptfds
);
191 FD_SET(scb
->fd
, &readfds
);
192 FD_SET(scb
->fd
, &exceptfds
);
197 numfds
= select(scb
->fd
+1, &readfds
, 0, &exceptfds
, &tv
);
199 numfds
= select(scb
->fd
+1, &readfds
, 0, &exceptfds
, 0);
203 return SERIAL_TIMEOUT
;
204 else if (errno
== EINTR
)
207 return SERIAL_ERROR
; /* Got an error from select or poll */
213 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
214 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
215 char if successful. Returns -2 if timeout expired, EOF if line dropped
216 dead, or -3 for any other error (see errno in that case). */
219 tcp_readchar(scb
, timeout
)
225 if (scb
->bufcnt
-- > 0)
228 status
= wait_for(scb
, timeout
);
235 scb
->bufcnt
= read(scb
->fd
, scb
->buf
, BUFSIZ
);
236 if (scb
->bufcnt
!= -1 || errno
!= EINTR
)
240 if (scb
->bufcnt
<= 0)
241 if (scb
->bufcnt
== 0)
242 return SERIAL_TIMEOUT
; /* 0 chars means timeout [may need to
243 distinguish between EOF & timeouts
246 return SERIAL_ERROR
; /* Got an error from read */
249 scb
->bufp
= scb
->buf
;
254 tcp_noflush_set_tty_state (scb
, new_ttystate
, old_ttystate
)
256 serial_ttystate new_ttystate
;
257 serial_ttystate old_ttystate
;
263 tcp_print_tty_state (scb
, ttystate
)
265 serial_ttystate ttystate
;
267 /* Nothing to print. */
272 tcp_setbaudrate(scb
, rate
)
276 return 0; /* Never fails! */
280 tcp_setstopbits(scb
, num
)
284 return 0; /* Never fails! */
288 tcp_write(scb
, str
, len
)
297 cc
= write(scb
->fd
, str
, len
);
318 static struct serial_ops tcp_ops
=
326 tcp_return_0
, /* flush output */
327 tcp_return_0
, /* flush input */
328 tcp_return_0
, /* send break */
333 tcp_noflush_set_tty_state
,
339 _initialize_ser_tcp ()
341 serial_add_interface (&tcp_ops
);