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);