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_write
PARAMS ((serial_t scb
, const char *str
, int len
));
42 static void tcp_restore
PARAMS ((serial_t scb
));
43 static void tcp_close
PARAMS ((serial_t scb
));
44 static serial_ttystate tcp_get_tty_state
PARAMS ((serial_t scb
));
45 static int tcp_set_tty_state
PARAMS ((serial_t scb
, serial_ttystate state
));
47 /* Open up a raw tcp socket */
56 struct hostent
*hostent
;
57 struct sockaddr_in sockaddr
;
60 struct protoent
*protoent
;
62 port_str
= strchr (name
, ':');
65 error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
67 tmp
= min(port_str
- name
+ 1, sizeof hostname
);
68 strncpy (hostname
, name
, tmp
- 1); /* Don't want colon */
69 port
= atoi (port_str
+ 1);
71 hostent
= gethostbyname (hostname
);
79 scb
->fd
= socket (PF_INET
, SOCK_STREAM
, 0);
83 /* Allow rapid reuse of this port. */
85 setsockopt (scb
->fd
, SOL_SOCKET
, SO_REUSEADDR
, (char *)&tmp
, sizeof(tmp
));
87 /* Enable TCP keep alive process. */
89 setsockopt (scb
->fd
, SOL_SOCKET
, SO_KEEPALIVE
, (char *)&tmp
, sizeof(tmp
));
91 sockaddr
.sin_family
= PF_INET
;
92 sockaddr
.sin_port
= htons(port
);
93 memcpy (&sockaddr
.sin_addr
.s_addr
, hostent
->h_addr
,
94 sizeof (struct in_addr
));
96 if (connect(scb
->fd
, &sockaddr
, sizeof(sockaddr
)))
102 protoent
= getprotobyname ("tcp");
107 if (setsockopt (scb
->fd
, protoent
->p_proto
, TCP_NODELAY
,
108 (char *)&tmp
, sizeof(tmp
)))
111 signal(SIGPIPE
, SIG_IGN
); /* If we don't do this, then GDB simply exits
112 when the remote side dies. */
117 static serial_ttystate
118 tcp_get_tty_state(scb
)
121 struct tcp_ttystate
*state
;
123 state
= (struct tcp_ttystate
*)xmalloc(sizeof *state
);
125 return (serial_ttystate
)state
;
129 tcp_set_tty_state(scb
, ttystate
)
131 serial_ttystate ttystate
;
133 struct tcp_ttystate
*state
;
135 state
= (struct tcp_ttystate
*)ttystate
;
144 return; /* Always in raw mode */
147 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
148 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
150 For termio{s}, we actually just setup VTIME if necessary, and let the
151 timeout occur in the read() in tcp_read().
155 wait_for(scb
, timeout
)
168 FD_SET(scb
->fd
, &readfds
);
171 numfds
= select(scb
->fd
+1, &readfds
, 0, 0, &tv
);
173 numfds
= select(scb
->fd
+1, &readfds
, 0, 0, 0);
177 return SERIAL_TIMEOUT
;
179 return SERIAL_ERROR
; /* Got an error from select or poll */
184 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
185 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
186 char if successful. Returns -2 if timeout expired, EOF if line dropped
187 dead, or -3 for any other error (see errno in that case). */
190 tcp_readchar(scb
, timeout
)
196 if (scb
->bufcnt
-- > 0)
199 status
= wait_for(scb
, timeout
);
204 scb
->bufcnt
= read(scb
->fd
, scb
->buf
, BUFSIZ
);
206 if (scb
->bufcnt
<= 0)
207 if (scb
->bufcnt
== 0)
208 return SERIAL_TIMEOUT
; /* 0 chars means timeout [may need to
209 distinguish between EOF & timeouts
212 return SERIAL_ERROR
; /* Got an error from read */
215 scb
->bufp
= scb
->buf
;
220 tcp_setbaudrate(scb
, rate
)
224 return 0; /* Never fails! */
228 tcp_write(scb
, str
, len
)
237 cc
= write(scb
->fd
, str
, len
);
258 static struct serial_ops tcp_ops
=
273 _initialize_ser_tcp ()
275 serial_add_interface (&tcp_ops
);