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
;
63 port_str
= strchr (name
, ':');
66 error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
68 tmp
= min (port_str
- name
, sizeof hostname
- 1);
69 strncpy (hostname
, name
, tmp
); /* Don't want colon */
70 hostname
[tmp
] = '\000'; /* Tie off host name */
71 port
= atoi (port_str
+ 1);
73 hostent
= gethostbyname (hostname
);
77 fprintf_unfiltered (gdb_stderr
, "%s: unknown host\n", hostname
);
82 scb
->fd
= socket (PF_INET
, SOCK_STREAM
, 0);
86 /* Allow rapid reuse of this port. */
88 setsockopt (scb
->fd
, SOL_SOCKET
, SO_REUSEADDR
, (char *)&tmp
, sizeof(tmp
));
90 /* Enable TCP keep alive process. */
92 setsockopt (scb
->fd
, SOL_SOCKET
, SO_KEEPALIVE
, (char *)&tmp
, sizeof(tmp
));
94 sockaddr
.sin_family
= PF_INET
;
95 sockaddr
.sin_port
= htons(port
);
96 memcpy (&sockaddr
.sin_addr
.s_addr
, hostent
->h_addr
,
97 sizeof (struct in_addr
));
99 if (connect (scb
->fd
, (struct sockaddr
*) &sockaddr
, sizeof(sockaddr
)))
106 protoent
= getprotobyname ("tcp");
111 if (setsockopt (scb
->fd
, protoent
->p_proto
, TCP_NODELAY
,
112 (char *)&tmp
, sizeof(tmp
)))
115 signal(SIGPIPE
, SIG_IGN
); /* If we don't do this, then GDB simply exits
116 when the remote side dies. */
121 static serial_ttystate
122 tcp_get_tty_state(scb
)
125 struct tcp_ttystate
*state
;
127 state
= (struct tcp_ttystate
*)xmalloc(sizeof *state
);
129 return (serial_ttystate
)state
;
133 tcp_set_tty_state(scb
, ttystate
)
135 serial_ttystate ttystate
;
137 struct tcp_ttystate
*state
;
139 state
= (struct tcp_ttystate
*)ttystate
;
155 return; /* Always in raw mode */
158 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
159 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
161 For termio{s}, we actually just setup VTIME if necessary, and let the
162 timeout occur in the read() in tcp_read().
166 wait_for(scb
, timeout
)
172 fd_set readfds
, exceptfds
;
175 FD_ZERO (&exceptfds
);
180 FD_SET(scb
->fd
, &readfds
);
181 FD_SET(scb
->fd
, &exceptfds
);
186 numfds
= select(scb
->fd
+1, &readfds
, 0, &exceptfds
, &tv
);
188 numfds
= select(scb
->fd
+1, &readfds
, 0, &exceptfds
, 0);
192 return SERIAL_TIMEOUT
;
193 else if (errno
== EINTR
)
196 return SERIAL_ERROR
; /* Got an error from select or poll */
202 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
203 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
204 char if successful. Returns -2 if timeout expired, EOF if line dropped
205 dead, or -3 for any other error (see errno in that case). */
208 tcp_readchar(scb
, timeout
)
214 if (scb
->bufcnt
-- > 0)
217 status
= wait_for(scb
, timeout
);
224 scb
->bufcnt
= read(scb
->fd
, scb
->buf
, BUFSIZ
);
225 if (scb
->bufcnt
!= -1 || errno
!= EINTR
)
229 if (scb
->bufcnt
<= 0)
230 if (scb
->bufcnt
== 0)
231 return SERIAL_TIMEOUT
; /* 0 chars means timeout [may need to
232 distinguish between EOF & timeouts
235 return SERIAL_ERROR
; /* Got an error from read */
238 scb
->bufp
= scb
->buf
;
243 tcp_noflush_set_tty_state (scb
, new_ttystate
, old_ttystate
)
245 serial_ttystate new_ttystate
;
246 serial_ttystate old_ttystate
;
252 tcp_print_tty_state (scb
, ttystate
)
254 serial_ttystate ttystate
;
256 /* Nothing to print. */
261 tcp_setbaudrate(scb
, rate
)
265 return 0; /* Never fails! */
269 tcp_setstopbits(scb
, num
)
273 return 0; /* Never fails! */
277 tcp_write(scb
, str
, len
)
286 cc
= write(scb
->fd
, str
, len
);
307 static struct serial_ops tcp_ops
=
315 tcp_return_0
, /* flush output */
316 tcp_return_0
, /* flush input */
317 tcp_return_0
, /* send break */
322 tcp_noflush_set_tty_state
,
328 _initialize_ser_tcp ()
330 serial_add_interface (&tcp_ops
);