404 lines
9 KiB
C
404 lines
9 KiB
C
/* Serial interface for raw TCP connections on Un*x like systems
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Copyright 1992, 1993, 1998 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "serial.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#ifndef __CYGWIN32__
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#include <netinet/tcp.h>
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#endif
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#include "signals.h"
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#include "gdb_string.h"
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extern int (*ui_loop_hook) PARAMS ((int));
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struct tcp_ttystate
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{
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int bogus;
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};
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static int tcp_open PARAMS ((serial_t scb, const char *name));
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static void tcp_raw PARAMS ((serial_t scb));
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static int wait_for PARAMS ((serial_t scb, int timeout));
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static int tcp_readchar PARAMS ((serial_t scb, int timeout));
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static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
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static int tcp_setstopbits PARAMS ((serial_t scb, int num));
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static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
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/* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
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static void tcp_close PARAMS ((serial_t scb));
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static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
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static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
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static int tcp_return_0 PARAMS ((serial_t));
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static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
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serial_ttystate));
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static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate));
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void _initialize_ser_tcp PARAMS ((void));
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/* Open up a raw tcp socket */
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static int
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tcp_open (scb, name)
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serial_t scb;
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const char *name;
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{
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char *port_str;
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int port;
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struct hostent *hostent;
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struct sockaddr_in sockaddr;
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int tmp;
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char hostname[100];
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struct protoent *protoent;
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int i;
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port_str = strchr (name, ':');
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if (!port_str)
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error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
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tmp = min (port_str - name, (int) sizeof hostname - 1);
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strncpy (hostname, name, tmp); /* Don't want colon */
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hostname[tmp] = '\000'; /* Tie off host name */
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port = atoi (port_str + 1);
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hostent = gethostbyname (hostname);
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if (!hostent)
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{
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fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
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errno = ENOENT;
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return -1;
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}
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for (i = 1; i <= 15; i++)
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{
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scb->fd = socket (PF_INET, SOCK_STREAM, 0);
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if (scb->fd < 0)
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return -1;
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/* Allow rapid reuse of this port. */
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tmp = 1;
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setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, sizeof (tmp));
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/* Enable TCP keep alive process. */
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tmp = 1;
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setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
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sockaddr.sin_family = PF_INET;
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sockaddr.sin_port = htons (port);
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memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
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sizeof (struct in_addr));
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if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)))
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break;
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close (scb->fd);
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scb->fd = -1;
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/* We retry for ECONNREFUSED because that is often a temporary condition, which
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happens when the server is being restarted. */
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if (errno != ECONNREFUSED)
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return -1;
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sleep (1);
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}
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protoent = getprotobyname ("tcp");
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if (!protoent)
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return -1;
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tmp = 1;
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if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
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(char *) &tmp, sizeof (tmp)))
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return -1;
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signal (SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits
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when the remote side dies. */
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return 0;
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}
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static serial_ttystate
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tcp_get_tty_state (scb)
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serial_t scb;
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{
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struct tcp_ttystate *state;
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state = (struct tcp_ttystate *) xmalloc (sizeof *state);
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return (serial_ttystate) state;
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}
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static int
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tcp_set_tty_state (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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struct tcp_ttystate *state;
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state = (struct tcp_ttystate *) ttystate;
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return 0;
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}
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static int
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tcp_return_0 (scb)
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serial_t scb;
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{
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return 0;
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}
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static void
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tcp_raw (scb)
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serial_t scb;
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{
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return; /* Always in raw mode */
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}
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/* Wait for input on scb, with timeout seconds. Returns 0 on success,
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otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
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For termio{s}, we actually just setup VTIME if necessary, and let the
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timeout occur in the read() in tcp_read().
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*/
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static int
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wait_for (scb, timeout)
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serial_t scb;
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int timeout;
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{
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int numfds;
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struct timeval tv;
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fd_set readfds, exceptfds;
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FD_ZERO (&readfds);
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FD_ZERO (&exceptfds);
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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FD_SET (scb->fd, &readfds);
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FD_SET (scb->fd, &exceptfds);
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while (1)
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{
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if (timeout >= 0)
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numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
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else
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numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
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if (numfds <= 0)
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{
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if (numfds == 0)
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return SERIAL_TIMEOUT;
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else if (errno == EINTR)
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continue;
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else
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return SERIAL_ERROR; /* Got an error from select or poll */
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}
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return 0;
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}
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}
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/* Read a character with user-specified timeout. TIMEOUT is number of seconds
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to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
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char if successful. Returns -2 if timeout expired, EOF if line dropped
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dead, or -3 for any other error (see errno in that case). */
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static int
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tcp_readchar (scb, timeout)
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serial_t scb;
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int timeout;
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{
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int status;
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int delta;
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if (scb->bufcnt-- > 0)
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return *scb->bufp++;
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/* We have to be able to keep the GUI alive here, so we break the original
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timeout into steps of 1 second, running the "keep the GUI alive" hook
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each time through the loop.
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Also, timeout = 0 means to poll, so we just set the delta to 0, so we
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will only go through the loop once. */
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delta = (timeout == 0 ? 0 : 1);
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while (1)
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{
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/* N.B. The UI may destroy our world (for instance by calling
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remote_stop,) in which case we want to get out of here as
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quickly as possible. It is not safe to touch scb, since
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someone else might have freed it. The ui_loop_hook signals that
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we should exit by returning 1. */
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if (ui_loop_hook)
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{
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if (ui_loop_hook (0))
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return SERIAL_TIMEOUT;
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}
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status = wait_for (scb, delta);
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timeout -= delta;
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/* If we got a character or an error back from wait_for, then we can
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break from the loop before the timeout is completed. */
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if (status != SERIAL_TIMEOUT)
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{
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break;
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}
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/* If we have exhausted the original timeout, then generate
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a SERIAL_TIMEOUT, and pass it out of the loop. */
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else if (timeout == 0)
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{
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status = SERIAL_TIMEOUT;
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break;
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}
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}
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if (status < 0)
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return status;
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while (1)
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{
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scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
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if (scb->bufcnt != -1 || errno != EINTR)
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break;
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}
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if (scb->bufcnt <= 0)
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{
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if (scb->bufcnt == 0)
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return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
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distinguish between EOF & timeouts
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someday] */
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else
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return SERIAL_ERROR; /* Got an error from read */
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}
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scb->bufcnt--;
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scb->bufp = scb->buf;
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return *scb->bufp++;
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}
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static int
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tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
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serial_t scb;
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serial_ttystate new_ttystate;
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serial_ttystate old_ttystate;
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{
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return 0;
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}
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static void
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tcp_print_tty_state (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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/* Nothing to print. */
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return;
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}
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static int
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tcp_setbaudrate (scb, rate)
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serial_t scb;
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int rate;
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{
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return 0; /* Never fails! */
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}
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static int
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tcp_setstopbits (scb, num)
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serial_t scb;
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int num;
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{
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return 0; /* Never fails! */
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}
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static int
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tcp_write (scb, str, len)
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serial_t scb;
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const char *str;
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int len;
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{
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int cc;
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while (len > 0)
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{
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cc = write (scb->fd, str, len);
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if (cc < 0)
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return 1;
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len -= cc;
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str += cc;
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}
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return 0;
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}
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static void
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tcp_close (scb)
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serial_t scb;
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{
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if (scb->fd < 0)
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return;
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close (scb->fd);
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scb->fd = -1;
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}
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static struct serial_ops tcp_ops =
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{
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"tcp",
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0,
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tcp_open,
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tcp_close,
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tcp_readchar,
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tcp_write,
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tcp_return_0, /* flush output */
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tcp_return_0, /* flush input */
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tcp_return_0, /* send break */
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tcp_raw,
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tcp_get_tty_state,
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tcp_set_tty_state,
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tcp_print_tty_state,
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tcp_noflush_set_tty_state,
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tcp_setbaudrate,
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tcp_setstopbits,
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tcp_return_0, /* wait for output to drain */
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};
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void
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_initialize_ser_tcp ()
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{
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serial_add_interface (&tcp_ops);
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}
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