Initial revision

lib-src/tcp.c

+/*
+ * TCP/IP stream emulation for GNU Emacs.
+ * Copyright (C) 1988, 1989, 1992, 1993 Free Software Foundation, Inc.
+
+ * Author: Masanobu Umeda
+ * Maintainer: umerin@mse.kyutech.ac.jp
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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.
+
+GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ *
+ * Yasunari, Itoh at PFU limited contributed for Fujitsu UTS and SX/A.
+ *
+ * Thu Apr  6 13:47:37 JST 1989
+ * USG fixes by Sakaeda <saka@mickey.trad.pf.fujitsu.junet>
+ *
+ * For Fujitsu UTS compile with:
+ *	cc -O -o tcp tcp.c -DFUJITSU_UTS -lu -lsocket
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/types.h>
+
+#ifdef FUJITSU_UTS
+#define USG
+#include <sys/ucbtypes.h>
+#include <sys/tisp/socket.h>
+#include <netdb.h>
+#include <sys/tisp/in.h>
+#else
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#endif
+
+#ifdef USG
+#include <sys/stat.h>
+#include <signal.h>
+#endif
+
+#ifdef FUJITSU_UTS
+#define bcopy(f, t, n)    memcpy (t, f, n)
+#define bcmp(b1, b2, n)   (memcmp (b1, b2, n)!=0)
+#define bzero(b, n)      memset (b, 0, n)
+#endif
+
+#ifdef USG
+int selectable = 1;
+
+sigout ()
+{
+  fcntl (fileno (stdin), F_SETFL, 0);
+  exit (-1);
+}
+#endif
+
+main (argc, argv)
+     int argc;
+     char *argv[];
+{
+  struct hostent	*host;
+  struct sockaddr_in	sockin, sockme;
+  struct servent	*serv;
+  char	*hostname = NULL;
+  char	*service = "nntp";
+  int	port;
+  int	readfds;
+  int   writefds;
+  int	server;			/* NNTP Server */
+  int	emacsIn = fileno (stdin); /* Emacs intput */
+  int	emacsOut = fileno (stdout); /* Emacs output */
+  char	buffer[1024];
+  int	nbuffer;		/* Number of bytes in buffer */
+  int   wret;
+  char  *retry;			/* retry bufferp */
+  int   false = 0;		/* FALSE flag for setsockopt () */
+
+  if (argc < 2)
+    {
+      fprintf (stderr, "Usage: %s HOST [SERVICE]\n", argv[0]);
+      exit (1);
+    }
+  if (argc >= 2)
+    hostname = argv[1];
+  if (argc >= 3)
+    service = argv[2];
+
+  if ((host = gethostbyname (hostname)) == NULL)
+    {
+      perror ("gethostbyname");
+      exit (1);
+    }
+  if (isdigit (service[0]))
+    port = atoi (service);
+  else
+    {
+      serv = getservbyname (service, "tcp");
+      if (serv == NULL)
+	{
+	  perror ("getservbyname");
+	  exit (1);
+	}
+      port = serv->s_port;
+    }
+
+  bzero (&sockin, sizeof (sockin));
+  sockin.sin_family = host->h_addrtype;
+  bcopy (host->h_addr, &sockin.sin_addr, host->h_length);
+  sockin.sin_port = port;
+  if ((server = socket (AF_INET, SOCK_STREAM, 0)) < 0)
+    {
+      perror ("socket");
+      exit (1);
+    }
+  if (setsockopt (server, SOL_SOCKET, SO_REUSEADDR, &false, sizeof (false)))
+    {
+      perror ("setsockopt");
+      exit (1);
+    }
+  bzero (&sockme, sizeof (sockme));
+  sockme.sin_family = sockin.sin_family;
+  sockme.sin_addr.s_addr = INADDR_ANY;
+  if (bind (server, &sockme, sizeof (sockme)) < 0)
+    {
+      perror ("bind");
+      exit (1);
+    }
+  if (connect (server, &sockin, sizeof (sockin)) < 0)
+    {
+      perror ("connect");
+      close (server);
+      exit (1);
+    }
+
+#ifdef O_NDELAY
+  fcntl (server, F_SETFL, O_NDELAY);
+
+#ifdef USG
+  /* USG pipe cannot not select emacsIn */
+  {
+    struct stat statbuf;
+    fstat (emacsIn, &statbuf);
+    if (statbuf.st_mode & 010000)
+      selectable = 0;
+    if (!selectable)
+      {
+	signal (SIGINT, sigout);
+	fcntl (emacsIn, F_SETFL, O_NDELAY);
+      }
+  }
+#endif
+#endif
+
+  /* Connection established. */
+  while (1)
+    {
+      readfds = (1 << server) | (1 << emacsIn);
+      if (select (32, &readfds, NULL, NULL, (struct timeval *)NULL) == -1)
+	{
+	  perror ("select");
+	  exit (1);
+	}
+      if (readfds & (1 << emacsIn))
+	{
+	  /* From Emacs */
+	  nbuffer = read (emacsIn, buffer, sizeof buffer -1);
+
+#ifdef USG
+	  if (selectable && nbuffer == 0)
+	    {
+	      goto finish;
+	    }
+	  else if (!(readfds & (1 << server)) && nbuffer == 0)
+	    {
+	      sleep (1);
+	    }
+	  else 
+#else
+	    if (nbuffer == 0)
+	      goto finish;
+#endif
+	  for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
+	    {
+	      writefds = 1 << server;
+	      if (select (server+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
+		{
+		  perror ("select");
+		  exit (1);
+		}
+	      wret = write (server, retry, nbuffer);
+	      if (wret < 0) goto finish;
+	    }
+	}
+      if (readfds & (1 << server))
+	{
+	  /* From NNTP server */
+	  nbuffer = read (server, buffer, sizeof buffer -1);
+	  if (nbuffer == 0)
+	    goto finish;
+	  for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
+	    {
+	      writefds = 1 << emacsOut;
+#ifdef USG
+	      if (selectable)
+#endif
+		if (select (emacsOut+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
+		  {
+		    perror ("select");
+		    exit (1);
+		  }
+	      wret = write (emacsOut, retry, nbuffer);
+	      if (wret < 0) goto finish;
+	    }
+	}
+    }
+
+  /* End of communication. */
+ finish:
+  close (server);
+#ifdef USG
+  if (!selectable) fcntl (emacsIn, F_SETFL, 0);
+#endif
+  close (emacsIn);
+  close (emacsOut);
+  exit (0);
+}