Initial revision

1 files changed, 358 insertions, 0 deletions

diff --git a/gdb/ser-tcp.c b/gdb/ser-tcp.c
new file mode 100644
index 00000000000..c55133760fa
--- /dev/null
+++ b/gdb/ser-tcp.c
@@ -0,0 +1,358 @@
+/* Serial interface for raw TCP connections on Un*x like systems
+   Copyright 1992, 1993, 1998 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 <sys/types.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/socket.h>
+
+#ifndef __CYGWIN32__
+#include <netinet/tcp.h>
+#endif
+
+#include "signals.h"
+#include "gdb_string.h"
+
+struct tcp_ttystate
+{
+  int bogus;
+};
+
+static int tcp_open PARAMS ((serial_t scb, const char *name));
+static void tcp_raw PARAMS ((serial_t scb));
+static int wait_for PARAMS ((serial_t scb, int timeout));
+static int tcp_readchar PARAMS ((serial_t scb, int timeout));
+static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
+static int tcp_setstopbits PARAMS ((serial_t scb, int num));
+static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
+/* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
+static void tcp_close PARAMS ((serial_t scb));
+static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
+static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
+static int tcp_return_0 PARAMS ((serial_t));
+static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
+					      serial_ttystate));
+static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate));
+
+void _initialize_ser_tcp PARAMS ((void));
+
+/* Open up a raw tcp socket */
+
+static int
+tcp_open(scb, name)
+     serial_t scb;
+     const char *name;
+{
+  char *port_str;
+  int port;
+  struct hostent *hostent;
+  struct sockaddr_in sockaddr;
+  int tmp;
+  char hostname[100];
+  struct protoent *protoent;
+  int i;
+
+  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);
+
+  hostent = gethostbyname (hostname);
+
+  if (!hostent)
+    {
+      fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
+      errno = ENOENT;
+      return -1;
+    }
+
+  for (i = 1; i <= 15; i++)
+    {
+      scb->fd = socket (PF_INET, SOCK_STREAM, 0);
+      if (scb->fd < 0)
+	return -1;
+
+      /* Allow rapid reuse of this port. */
+      tmp = 1;
+      setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
+
+      /* Enable TCP keep alive process. */
+      tmp = 1;
+      setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
+
+      sockaddr.sin_family = PF_INET;
+      sockaddr.sin_port = htons(port);
+      memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
+	      sizeof (struct in_addr));
+
+      if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)))
+	break;
+
+      close (scb->fd);
+      scb->fd = -1;
+
+/* We retry for ECONNREFUSED because that is often a temporary condition, which
+   happens when the server is being restarted.  */
+
+      if (errno != ECONNREFUSED)
+	return -1;
+
+      sleep (1);
+    }
+
+  protoent = getprotobyname ("tcp");
+  if (!protoent)
+    return -1;
+
+  tmp = 1;
+  if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
+		  (char *)&tmp, sizeof(tmp)))
+    return -1;
+
+  signal(SIGPIPE, SIG_IGN);	/* If we don't do this, then GDB simply exits
+				   when the remote side dies.  */
+
+  return 0;
+}
+
+static serial_ttystate
+tcp_get_tty_state(scb)
+     serial_t scb;
+{
+  struct tcp_ttystate *state;
+
+  state = (struct tcp_ttystate *)xmalloc(sizeof *state);
+
+  return (serial_ttystate)state;
+}
+
+static int
+tcp_set_tty_state(scb, ttystate)
+     serial_t scb;
+     serial_ttystate ttystate;
+{
+  struct tcp_ttystate *state;
+
+  state = (struct tcp_ttystate *)ttystate;
+
+  return 0;
+}
+
+static int
+tcp_return_0 (scb)
+     serial_t scb;
+{
+  return 0;
+}
+
+static void
+tcp_raw(scb)
+     serial_t scb;
+{
+  return;			/* Always in raw mode */
+}
+
+/* Wait for input on scb, with timeout seconds.  Returns 0 on success,
+   otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
+
+   For termio{s}, we actually just setup VTIME if necessary, and let the
+   timeout occur in the read() in tcp_read().
+ */
+
+static int
+wait_for (scb, timeout)
+     serial_t scb;
+     int timeout;
+{
+  int numfds;
+  struct timeval tv;
+  fd_set readfds, exceptfds;
+
+  FD_ZERO (&readfds);
+  FD_ZERO (&exceptfds);
+
+  tv.tv_sec = timeout;
+  tv.tv_usec = 0;
+
+  FD_SET(scb->fd, &readfds);
+  FD_SET(scb->fd, &exceptfds);
+
+  while (1)
+    {
+      if (timeout >= 0)
+	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
+      else
+	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
+
+      if (numfds <= 0)
+        {
+	  if (numfds == 0)
+	    return SERIAL_TIMEOUT;
+	  else if (errno == EINTR)
+	    continue;
+	  else
+	    return SERIAL_ERROR;	/* Got an error from select or poll */
+        }
+
+      return 0;
+    }
+}
+
+/* Read a character with user-specified timeout.  TIMEOUT is number of seconds
+   to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
+   char if successful.  Returns -2 if timeout expired, EOF if line dropped
+   dead, or -3 for any other error (see errno in that case). */
+
+static int
+tcp_readchar (scb, timeout)
+     serial_t scb;
+     int timeout;
+{
+  int status;
+
+  if (scb->bufcnt-- > 0)
+    return *scb->bufp++;
+
+  status = wait_for(scb, timeout);
+
+  if (status < 0)
+    return status;
+
+  while (1)
+    {
+      scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
+      if (scb->bufcnt != -1 || errno != EINTR)
+	break;
+    }
+
+  if (scb->bufcnt <= 0)
+    {
+      if (scb->bufcnt == 0)
+        return SERIAL_TIMEOUT;	/* 0 chars means timeout [may need to
+				     distinguish between EOF & timeouts
+				     someday] */
+      else
+        return SERIAL_ERROR;	/* Got an error from read */
+    }
+
+  scb->bufcnt--;
+  scb->bufp = scb->buf;
+  return *scb->bufp++;
+}
+
+static int
+tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
+     serial_t scb;
+     serial_ttystate new_ttystate;
+     serial_ttystate old_ttystate;
+{
+  return 0;
+}
+
+static void
+tcp_print_tty_state (scb, ttystate)
+     serial_t scb;
+     serial_ttystate ttystate;
+{
+  /* Nothing to print.  */
+  return;
+}
+
+static int
+tcp_setbaudrate(scb, rate)
+     serial_t scb;
+     int rate;
+{
+  return 0;			/* Never fails! */
+}
+
+static int
+tcp_setstopbits(scb, num)
+     serial_t scb;
+     int num;
+{
+  return 0;			/* Never fails! */
+}
+
+static int
+tcp_write(scb, str, len)
+     serial_t scb;
+     const char *str;
+     int len;
+{
+  int cc;
+
+  while (len > 0)
+    {
+      cc = write(scb->fd, str, len);
+
+      if (cc < 0)
+	return 1;
+      len -= cc;
+      str += cc;
+    }
+  return 0;
+}
+
+static void
+tcp_close(scb)
+     serial_t scb;
+{
+  if (scb->fd < 0)
+    return;
+
+  close(scb->fd);
+  scb->fd = -1;
+}
+
+static struct serial_ops tcp_ops =
+{
+  "tcp",
+  0,
+  tcp_open,
+  tcp_close,
+  tcp_readchar,
+  tcp_write,
+  tcp_return_0, /* flush output */
+  tcp_return_0, /* flush input */
+  tcp_return_0, /* send break */
+  tcp_raw,
+  tcp_get_tty_state,
+  tcp_set_tty_state,
+  tcp_print_tty_state,
+  tcp_noflush_set_tty_state,
+  tcp_setbaudrate,
+  tcp_setstopbits,
+  tcp_return_0,	/* wait for output to drain */
+};
+
+void
+_initialize_ser_tcp ()
+{
+  serial_add_interface (&tcp_ops);
+}