File: tcp.c

package info (click to toggle)
xemacs21 21.4.24-8
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 33,604 kB
  • sloc: ansic: 243,821; lisp: 94,071; cpp: 5,726; sh: 4,406; perl: 1,096; cs: 775; makefile: 761; python: 279; asm: 248; lex: 119; yacc: 95; sed: 22; csh: 9
file content (236 lines) | stat: -rw-r--r-- 5,390 bytes parent folder | download | duplicates (13)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*
 * 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 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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 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;
    }

  memset (&sockin, 0, sizeof (sockin));
  sockin.sin_family = host->h_addrtype;
  memcpy (&sockin.sin_addr, host->h_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);
    }
  memset (&sockme, 0, 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);
}