aboutsummaryrefslogtreecommitdiff
path: root/gdb/ser-tcp.c
blob: 6dc82846b6fe223b433b9a0596f3a63be4b7db0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/* Serial interface for raw TCP connections on Un*x like systems
   Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "serial.h"
#include "ser-unix.h"

#include <sys/types.h>

#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>  /* For FIONBIO. */
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>  /* For FIONBIO. */
#endif

#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/tcp.h>

#include <signal.h>
#include "gdb_string.h"

static int tcp_open (struct serial *scb, const char *name);
static void tcp_close (struct serial *scb);
extern int (*ui_loop_hook) (int);
void _initialize_ser_tcp (void);

/* seconds to wait for connect */
#define TIMEOUT 15
/* how many times per second to poll ui_loop_hook */
#define POLL_INTERVAL 2

/* Open a tcp socket */

static int
tcp_open (struct serial *scb, const char *name)
{
  char *port_str, hostname[100];
  int n, port, tmp;
  struct hostent *hostent;
  struct sockaddr_in sockaddr;

  port_str = strchr (name, ':');

  if (!port_str)
    error ("tcp_open: No colon in host name!");	   /* Shouldn't ever happen */

  tmp = min (port_str - name, (int) sizeof hostname - 1);
  strncpy (hostname, name, tmp);	/* Don't want colon */
  hostname[tmp] = '\000';	/* Tie off host name */
  port = atoi (port_str + 1);

  /* default hostname is localhost */
  if (!hostname[0])
    strcpy (hostname, "localhost");

  hostent = gethostbyname (hostname);
  if (!hostent)
    {
      fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
      errno = ENOENT;
      return -1;
    }

  scb->fd = socket (PF_INET, SOCK_STREAM, 0);
  if (scb->fd < 0)
    return -1;
  
  sockaddr.sin_family = PF_INET;
  sockaddr.sin_port = htons (port);
  memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
	  sizeof (struct in_addr));

  /* set socket nonblocking */
  tmp = 1;
  ioctl (scb->fd, FIONBIO, &tmp);

  /* Use Non-blocking connect.  connect() will return 0 if connected already. */
  n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));

  if (n < 0 && errno != EINPROGRESS)
    {
      tcp_close (scb);
      return -1;
    }

  if (n)
    {
      /* looks like we need to wait for the connect */
      struct timeval t;
      fd_set rset, wset;
      int polls = 0;
      FD_ZERO (&rset);

      do 
	{
	  /* While we wait for the connect to complete 
	     poll the UI so it can update or the user can 
	     interrupt. */
	  if (ui_loop_hook)
	    {
	      if (ui_loop_hook (0))
		{
		  errno = EINTR;
		  tcp_close (scb);
		  return -1;
		}
	    }
	  
	  FD_SET (scb->fd, &rset);
	  wset = rset;
	  t.tv_sec = 0;
	  t.tv_usec = 1000000 / POLL_INTERVAL;
	  
	  n = select (scb->fd + 1, &rset, &wset, NULL, &t);
	  polls++;
	} 
      while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL);
      if (n < 0 || polls > TIMEOUT * POLL_INTERVAL)
	{
	  if (polls > TIMEOUT * POLL_INTERVAL)
	    errno = ETIMEDOUT;
	  tcp_close (scb);
	  return -1;
	}
    }

  /* Got something.  Is it an error? */
  {
    int res, err, len;
    len = sizeof(err);
    res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, &err, &len);
    if (res < 0 || err)
      {
	if (err)
	  errno = err;
	tcp_close (scb);
	return -1;
      }
  } 
  
  /* turn off nonblocking */
  tmp = 0;
  ioctl (scb->fd, FIONBIO, &tmp);

  /* Disable Nagle algorithm. Needed in some cases. */
  tmp = 1;
  setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,
	      (char *)&tmp, sizeof (tmp));
  
  /* If we don't do this, then GDB simply exits
     when the remote side dies.  */
  signal (SIGPIPE, SIG_IGN);

  return 0;
}

static void
tcp_close (struct serial *scb)
{
  if (scb->fd < 0)
    return;

  close (scb->fd);
  scb->fd = -1;
}

void
_initialize_ser_tcp (void)
{
  struct serial_ops *ops = XMALLOC (struct serial_ops);
  memset (ops, sizeof (struct serial_ops), 0);
  ops->name = "tcp";
  ops->next = 0;
  ops->open = tcp_open;
  ops->close = tcp_close;
  ops->readchar = ser_unix_readchar;
  ops->write = ser_unix_write;
  ops->flush_output = ser_unix_nop_flush_output;
  ops->flush_input = ser_unix_flush_input;
  ops->send_break = ser_unix_nop_send_break;
  ops->go_raw = ser_unix_nop_raw;
  ops->get_tty_state = ser_unix_nop_get_tty_state;
  ops->set_tty_state = ser_unix_nop_set_tty_state;
  ops->print_tty_state = ser_unix_nop_print_tty_state;
  ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
  ops->setbaudrate = ser_unix_nop_setbaudrate;
  ops->setstopbits = ser_unix_nop_setstopbits;
  ops->drain_output = ser_unix_nop_drain_output;
  ops->async = ser_unix_async;
  serial_add_interface (ops);
}