toolchain/gdb/gdb/ser-tcp.c

   1 /* Serial interface for raw TCP connections on Un*x like systems
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "serial.h"
  24 #include "ser-unix.h"
  25
  26 #include <sys/types.h>
  27
  28 #ifdef HAVE_SYS_FILIO_H
  29 #include <sys/filio.h>  /* For FIONBIO. */
  30 #endif
  31 #ifdef HAVE_SYS_IOCTL_H
  32 #include <sys/ioctl.h>  /* For FIONBIO. */
  33 #endif
  34
  35 #include <sys/time.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <netdb.h>
  39 #include <sys/socket.h>
  40 #include <netinet/tcp.h>
  41
  42 #include <signal.h>
  43 #include "gdb_string.h"
  44
  45 static int net_open (struct serial *scb, const char *name);
  46 static void net_close (struct serial *scb);
  47 void _initialize_ser_tcp (void);
  48
  49 /* seconds to wait for connect */
  50 #define TIMEOUT 15
  51 /* how many times per second to poll deprecated_ui_loop_hook */
  52 #define POLL_INTERVAL 2
  53
  54 /* Open a tcp socket */
  55
  56 static int
  57 net_open (struct serial *scb, const char *name)
  58 {
  59   char *port_str, hostname[100];
  60   int n, port, tmp;
  61   int use_udp;
  62   struct hostent *hostent;
  63   struct sockaddr_in sockaddr;
  64
  65   use_udp = 0;
  66   if (strncmp (name, "udp:", 4) == 0)
  67     {
  68       use_udp = 1;
  69       name = name + 4;
  70     }
  71   else if (strncmp (name, "tcp:", 4) == 0)
  72     name = name + 4;
  73
  74   port_str = strchr (name, ':');
  75
  76   if (!port_str)
  77     error ("net_open: No colon in host name!");    /* Shouldn't ever happen */
  78
  79   tmp = min (port_str - name, (int) sizeof hostname - 1);
  80   strncpy (hostname, name, tmp);        /* Don't want colon */
  81   hostname[tmp] = '\000';       /* Tie off host name */
  82   port = atoi (port_str + 1);
  83
  84   /* default hostname is localhost */
  85   if (!hostname[0])
  86     strcpy (hostname, "localhost");
  87
  88   hostent = gethostbyname (hostname);
  89   if (!hostent)
  90     {
  91       fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
  92       errno = ENOENT;
  93       return -1;
  94     }
  95
  96   if (use_udp)
  97     scb->fd = socket (PF_INET, SOCK_DGRAM, 0);
  98   else
  99     scb->fd = socket (PF_INET, SOCK_STREAM, 0);
 100
 101   if (scb->fd < 0)
 102     return -1;
 103
 104   sockaddr.sin_family = PF_INET;
 105   sockaddr.sin_port = htons (port);
 106   memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
 107           sizeof (struct in_addr));
 108
 109   /* set socket nonblocking */
 110   tmp = 1;
 111   ioctl (scb->fd, FIONBIO, &tmp);
 112
 113   /* Use Non-blocking connect.  connect() will return 0 if connected already. */
 114   n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));
 115
 116   if (n < 0 && errno != EINPROGRESS)
 117     {
 118       net_close (scb);
 119       return -1;
 120     }
 121
 122   if (n)
 123     {
 124       /* looks like we need to wait for the connect */
 125       struct timeval t;
 126       fd_set rset, wset;
 127       int polls = 0;
 128       FD_ZERO (&rset);
 129
 130       do
 131         {
 132           /* While we wait for the connect to complete
 133              poll the UI so it can update or the user can
 134              interrupt. */
 135           if (deprecated_ui_loop_hook)
 136             {
 137               if (deprecated_ui_loop_hook (0))
 138                 {
 139                   errno = EINTR;
 140                   net_close (scb);
 141                   return -1;
 142                 }
 143             }
 144
 145           FD_SET (scb->fd, &rset);
 146           wset = rset;
 147           t.tv_sec = 0;
 148           t.tv_usec = 1000000 / POLL_INTERVAL;
 149
 150           n = select (scb->fd + 1, &rset, &wset, NULL, &t);
 151           polls++;
 152         }
 153       while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL);
 154       if (n < 0 || polls > TIMEOUT * POLL_INTERVAL)
 155         {
 156           if (polls > TIMEOUT * POLL_INTERVAL)
 157             errno = ETIMEDOUT;
 158           net_close (scb);
 159           return -1;
 160         }
 161     }
 162
 163   /* Got something.  Is it an error? */
 164   {
 165     int res, err, len;
 166     len = sizeof(err);
 167     res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, &err, &len);
 168     if (res < 0 || err)
 169       {
 170         if (err)
 171           errno = err;
 172         net_close (scb);
 173         return -1;
 174       }
 175   }
 176
 177   /* turn off nonblocking */
 178   tmp = 0;
 179   ioctl (scb->fd, FIONBIO, &tmp);
 180
 181   if (use_udp == 0)
 182     {
 183       /* Disable Nagle algorithm. Needed in some cases. */
 184       tmp = 1;
 185       setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,
 186                   (char *)&tmp, sizeof (tmp));
 187     }
 188
 189   /* If we don't do this, then GDB simply exits
 190      when the remote side dies.  */
 191   signal (SIGPIPE, SIG_IGN);
 192
 193   return 0;
 194 }
 195
 196 static void
 197 net_close (struct serial *scb)
 198 {
 199   if (scb->fd < 0)
 200     return;
 201
 202   close (scb->fd);
 203   scb->fd = -1;
 204 }
 205
 206 void
 207 _initialize_ser_tcp (void)
 208 {
 209   struct serial_ops *ops = XMALLOC (struct serial_ops);
 210   memset (ops, 0, sizeof (struct serial_ops));
 211   ops->name = "tcp";
 212   ops->next = 0;
 213   ops->open = net_open;
 214   ops->close = net_close;
 215   ops->readchar = ser_unix_readchar;
 216   ops->write = ser_unix_write;
 217   ops->flush_output = ser_unix_nop_flush_output;
 218   ops->flush_input = ser_unix_flush_input;
 219   ops->send_break = ser_unix_nop_send_break;
 220   ops->go_raw = ser_unix_nop_raw;
 221   ops->get_tty_state = ser_unix_nop_get_tty_state;
 222   ops->set_tty_state = ser_unix_nop_set_tty_state;
 223   ops->print_tty_state = ser_unix_nop_print_tty_state;
 224   ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
 225   ops->setbaudrate = ser_unix_nop_setbaudrate;
 226   ops->setstopbits = ser_unix_nop_setstopbits;
 227   ops->drain_output = ser_unix_nop_drain_output;
 228   ops->async = ser_unix_async;
 229   serial_add_interface (ops);
 230 }