--- /dev/null
+/* Serial port emulation using sockets.
+ Copyright (C) 1998 Free Software Foundation, Inc.
+ Contributed by Cygnus Solutions.
+
+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, 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. */
+
+/* FIXME: will obviously need to evolve.
+ - connectionless sockets might be more appropriate. */
+
+#include "sim-main.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+#include <signal.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include <errno.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 "sim-assert.h"
+#include "sim-options.h"
+
+#include "dv-sockser.h"
+\f
+/* Get definitions for both O_NONBLOCK and O_NDELAY. */
+
+#ifndef O_NDELAY
+#ifdef FNDELAY
+#define O_NDELAY FNDELAY
+#else /* ! defined (FNDELAY) */
+#define O_NDELAY 0
+#endif /* ! defined (FNDELAY) */
+#endif /* ! defined (O_NDELAY) */
+
+#ifndef O_NONBLOCK
+#ifdef FNBLOCK
+#define O_NONBLOCK FNBLOCK
+#else /* ! defined (FNBLOCK) */
+#define O_NONBLOCK 0
+#endif /* ! defined (FNBLOCK) */
+#endif /* ! defined (O_NONBLOCK) */
+\f
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+
+/* Compromise between eating cpu and properly busy-waiting.
+ One could have an option to set this but for now that seems
+ like featuritis. */
+#define DEFAULT_TIMEOUT 100 /* microseconds */
+
+/* FIXME: These should allocated at run time and kept with other simulator
+ state (duh...). Later. */
+const char * sockser_addr = NULL;
+/* Timeout in microseconds during status flag computation.
+ Setting this to zero achieves proper busy wait semantics but eats cpu. */
+static unsigned int sockser_timeout = DEFAULT_TIMEOUT;
+static int sockser_listen_fd = -1;
+static int sockser_fd = -1;
+\f
+/* FIXME: use tree properties when they're ready. */
+
+typedef enum {
+ OPTION_ADDR = OPTION_START
+} SOCKSER_OPTIONS;
+
+static DECLARE_OPTION_HANDLER (sockser_option_handler);
+
+static const OPTION sockser_options[] =
+{
+ { { "sockser-addr", required_argument, NULL, OPTION_ADDR },
+ '\0', "SOCKET ADDRESS", "Set serial emulation socket address",
+ sockser_option_handler },
+ { { NULL, no_argument, NULL, 0 }, '\0', NULL, NULL, NULL }
+};
+
+static SIM_RC
+sockser_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
+ char *arg, int is_command)
+{
+ switch (opt)
+ {
+ case OPTION_ADDR :
+ sockser_addr = arg;
+ break;
+ }
+
+ return SIM_RC_OK;
+}
+
+static SIM_RC
+dv_sockser_init (SIM_DESC sd)
+{
+ struct hostent *hostent;
+ struct sockaddr_in sockaddr;
+ char hostname[100];
+ const char *port_str;
+ int tmp,port;
+
+ if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT
+ || sockser_addr == NULL)
+ return SIM_RC_OK;
+
+ if (*sockser_addr == '/')
+ {
+ /* support for these can come later */
+ sim_io_eprintf (sd, "sockser init: unix domain sockets not supported: `%s'\n",
+ sockser_addr);
+ return SIM_RC_FAIL;
+ }
+
+ port_str = strchr (sockser_addr, ':');
+ if (!port_str)
+ {
+ sim_io_eprintf (sd, "sockser init: missing port number: `%s'\n",
+ sockser_addr);
+ return SIM_RC_FAIL;
+ }
+ tmp = MIN (port_str - sockser_addr, (int) sizeof hostname - 1);
+ strncpy (hostname, sockser_addr, tmp);
+ hostname[tmp] = '\000';
+ port = atoi (port_str + 1);
+
+ hostent = gethostbyname (hostname);
+ if (! hostent)
+ {
+ sim_io_eprintf (sd, "sockser init: unknown host: %s\n",
+ hostname);
+ return SIM_RC_FAIL;
+ }
+
+ sockser_listen_fd = socket (PF_INET, SOCK_STREAM, 0);
+ if (sockser_listen_fd < 0)
+ {
+ sim_io_eprintf (sd, "sockser init: unable to get socket: %s\n",
+ strerror (errno));
+ return SIM_RC_FAIL;
+ }
+
+ sockaddr.sin_family = PF_INET;
+ sockaddr.sin_port = htons(port);
+ memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
+ sizeof (struct in_addr));
+
+ if (bind (sockser_listen_fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0)
+ {
+ sim_io_eprintf (sd, "sockser init: unable to bind socket address: %s\n",
+ strerror (errno));
+ close (sockser_listen_fd);
+ sockser_listen_fd = -1;
+ return SIM_RC_FAIL;
+ }
+ if (listen (sockser_listen_fd, 1) < 0)
+ {
+ sim_io_eprintf (sd, "sockser init: unable to set up listener: %s\n",
+ strerror (errno));
+ close (sockser_listen_fd);
+ sockser_listen_fd = -1;
+ return SIM_RC_OK;
+ }
+
+ /* Handle writes to missing client -> SIGPIPE.
+ ??? Need a central signal management module. */
+ {
+ RETSIGTYPE (*orig) ();
+ orig = signal (SIGPIPE, SIG_IGN);
+ /* If a handler is already set up, don't mess with it. */
+ if (orig != SIG_DFL && orig != SIG_IGN)
+ signal (SIGPIPE, orig);
+ }
+
+ return SIM_RC_OK;
+}
+
+static void
+dv_sockser_uninstall (SIM_DESC sd)
+{
+ if (sockser_listen_fd != -1)
+ {
+ close (sockser_listen_fd);
+ sockser_listen_fd = -1;
+ }
+ if (sockser_fd != -1)
+ {
+ close (sockser_fd);
+ sockser_fd = -1;
+ }
+}
+
+SIM_RC
+dv_sockser_install (SIM_DESC sd)
+{
+ SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
+ if (sim_add_option_table (sd, NULL, sockser_options) != SIM_RC_OK)
+ return SIM_RC_FAIL;
+ sim_module_add_init_fn (sd, dv_sockser_init);
+ sim_module_add_uninstall_fn (sd, dv_sockser_uninstall);
+ return SIM_RC_OK;
+}
+
+static int
+connected_p (SIM_DESC sd)
+{
+ int numfds,flags;
+ struct timeval tv;
+ fd_set readfds;
+ struct sockaddr sockaddr;
+ int addrlen;
+
+ if (sockser_listen_fd == -1)
+ return 0;
+
+ if (sockser_fd >= 0)
+ {
+ /* FIXME: has client gone away? */
+ return 1;
+ }
+
+ /* Not connected. Connect with a client if there is one. */
+
+ FD_ZERO (&readfds);
+ FD_SET (sockser_listen_fd, &readfds);
+
+ /* ??? One can certainly argue this should be done differently,
+ but for now this is sufficient. */
+ tv.tv_sec = 0;
+ tv.tv_usec = sockser_timeout;
+
+ numfds = select (sockser_listen_fd + 1, &readfds, 0, 0, &tv);
+ if (numfds <= 0)
+ return 0;
+
+ sockser_fd = accept (sockser_listen_fd, &sockaddr, &addrlen);
+ if (sockser_fd < 0)
+ return 0;
+
+ /* Set non-blocking i/o. */
+ flags = fcntl (sockser_fd, F_GETFL);
+ flags |= O_NONBLOCK | O_NDELAY;
+ if (fcntl (sockser_fd, F_SETFL, flags) == -1)
+ {
+ sim_io_eprintf (sd, "unable to set nonblocking i/o");
+ close (sockser_fd);
+ sockser_fd = -1;
+ return 0;
+ }
+ return 1;
+}
+
+int
+dv_sockser_status (SIM_DESC sd)
+{
+ int numrfds,numwfds,status;
+ struct timeval tv;
+ fd_set readfds,writefds;
+
+ /* status to return if the socket isn't set up, or select fails */
+ status = DV_SOCKSER_INPUT_EMPTY | DV_SOCKSER_OUTPUT_EMPTY;
+
+ if (! connected_p (sd))
+ return status;
+
+ FD_ZERO (&readfds);
+ FD_ZERO (&writefds);
+ FD_SET (sockser_fd, &readfds);
+ FD_SET (sockser_fd, &writefds);
+
+ /* ??? One can certainly argue this should be done differently,
+ but for now this is sufficient. The read is done separately
+ from the write to enforce the delay which we heuristically set to
+ once every SOCKSER_TIMEOUT_FREQ tries.
+ No, this isn't great for SMP situations, blah blah blah. */
+
+ {
+ static int n;
+#define SOCKSER_TIMEOUT_FREQ 42
+ if (++n == SOCKSER_TIMEOUT_FREQ)
+ n = 0;
+ if (n == 0)
+ {
+ tv.tv_sec = 0;
+ tv.tv_usec = sockser_timeout;
+ numrfds = select (sockser_fd + 1, &readfds, 0, 0, &tv);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ numwfds = select (sockser_fd + 1, 0, &writefds, 0, &tv);
+ }
+ else /* do both selects at once */
+ {
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ numrfds = numwfds = select (sockser_fd + 1, &readfds, &writefds, 0, &tv);
+ }
+ }
+
+ status = 0;
+ if (numrfds <= 0 || ! FD_ISSET (sockser_fd, &readfds))
+ status |= DV_SOCKSER_INPUT_EMPTY;
+ if (numwfds <= 0 || FD_ISSET (sockser_fd, &writefds))
+ status |= DV_SOCKSER_OUTPUT_EMPTY;
+ return status;
+}
+
+int
+dv_sockser_write (SIM_DESC sd, unsigned char c)
+{
+ int n;
+
+ if (! connected_p (sd))
+ return -1;
+ n = write (sockser_fd, &c, 1);
+ if (n == -1)
+ {
+ if (errno == EPIPE)
+ {
+ close (sockser_fd);
+ sockser_fd = -1;
+ }
+ return -1;
+ }
+ if (n != 1)
+ return -1;
+ return 1;
+}
+
+int
+dv_sockser_read (SIM_DESC sd)
+{
+ unsigned char c;
+ int n;
+
+ if (! connected_p (sd))
+ return -1;
+ n = read (sockser_fd, &c, 1);
+ /* ??? We're assuming semantics that may not be correct for all hosts.
+ In particular (from cvssrc/src/server.c), this assumes that we are using
+ BSD or POSIX nonblocking I/O. System V nonblocking I/O returns zero if
+ there is nothing to read. */
+ if (n == 0)
+ {
+ close (sockser_fd);
+ sockser_fd = -1;
+ return -1;
+ }
+ if (n != 1)
+ return -1;
+ return c;
+}
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