1 /* Serial interface for raw TCP connections on Un*x like systems
2 Copyright 1992, 1993, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include <sys/types.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
27 #include <sys/socket.h>
30 #include <netinet/tcp.h>
34 #include "gdb_string.h"
41 static int tcp_open PARAMS ((serial_t scb, const char *name));
42 static void tcp_raw PARAMS ((serial_t scb));
43 static int wait_for PARAMS ((serial_t scb, int timeout));
44 static int tcp_readchar PARAMS ((serial_t scb, int timeout));
45 static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
46 static int tcp_setstopbits PARAMS ((serial_t scb, int num));
47 static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
48 /* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
49 static void tcp_close PARAMS ((serial_t scb));
50 static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
51 static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
52 static int tcp_return_0 PARAMS ((serial_t));
53 static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
55 static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate));
57 void _initialize_ser_tcp PARAMS ((void));
59 /* Open up a raw tcp socket */
68 struct hostent *hostent;
69 struct sockaddr_in sockaddr;
72 struct protoent *protoent;
75 port_str = strchr (name, ':');
78 error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
80 tmp = min (port_str - name, (int) sizeof hostname - 1);
81 strncpy (hostname, name, tmp); /* Don't want colon */
82 hostname[tmp] = '\000'; /* Tie off host name */
83 port = atoi (port_str + 1);
85 hostent = gethostbyname (hostname);
89 fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
94 for (i = 1; i <= 15; i++)
96 scb->fd = socket (PF_INET, SOCK_STREAM, 0);
100 /* Allow rapid reuse of this port. */
102 setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
104 /* Enable TCP keep alive process. */
106 setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
108 sockaddr.sin_family = PF_INET;
109 sockaddr.sin_port = htons(port);
110 memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
111 sizeof (struct in_addr));
113 if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)))
119 /* We retry for ECONNREFUSED because that is often a temporary condition, which
120 happens when the server is being restarted. */
122 if (errno != ECONNREFUSED)
128 protoent = getprotobyname ("tcp");
133 if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
134 (char *)&tmp, sizeof(tmp)))
137 signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits
138 when the remote side dies. */
143 static serial_ttystate
144 tcp_get_tty_state(scb)
147 struct tcp_ttystate *state;
149 state = (struct tcp_ttystate *)xmalloc(sizeof *state);
151 return (serial_ttystate)state;
155 tcp_set_tty_state(scb, ttystate)
157 serial_ttystate ttystate;
159 struct tcp_ttystate *state;
161 state = (struct tcp_ttystate *)ttystate;
177 return; /* Always in raw mode */
180 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
181 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
183 For termio{s}, we actually just setup VTIME if necessary, and let the
184 timeout occur in the read() in tcp_read().
188 wait_for (scb, timeout)
194 fd_set readfds, exceptfds;
197 FD_ZERO (&exceptfds);
202 FD_SET(scb->fd, &readfds);
203 FD_SET(scb->fd, &exceptfds);
208 numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
210 numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
215 return SERIAL_TIMEOUT;
216 else if (errno == EINTR)
219 return SERIAL_ERROR; /* Got an error from select or poll */
226 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
227 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
228 char if successful. Returns -2 if timeout expired, EOF if line dropped
229 dead, or -3 for any other error (see errno in that case). */
232 tcp_readchar (scb, timeout)
238 if (scb->bufcnt-- > 0)
241 status = wait_for(scb, timeout);
248 scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
249 if (scb->bufcnt != -1 || errno != EINTR)
253 if (scb->bufcnt <= 0)
255 if (scb->bufcnt == 0)
256 return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
257 distinguish between EOF & timeouts
260 return SERIAL_ERROR; /* Got an error from read */
264 scb->bufp = scb->buf;
269 tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
271 serial_ttystate new_ttystate;
272 serial_ttystate old_ttystate;
278 tcp_print_tty_state (scb, ttystate)
280 serial_ttystate ttystate;
282 /* Nothing to print. */
287 tcp_setbaudrate(scb, rate)
291 return 0; /* Never fails! */
295 tcp_setstopbits(scb, num)
299 return 0; /* Never fails! */
303 tcp_write(scb, str, len)
312 cc = write(scb->fd, str, len);
333 static struct serial_ops tcp_ops =
341 tcp_return_0, /* flush output */
342 tcp_return_0, /* flush input */
343 tcp_return_0, /* send break */
348 tcp_noflush_set_tty_state,
351 tcp_return_0, /* wait for output to drain */
355 _initialize_ser_tcp ()
357 serial_add_interface (&tcp_ops);