File: rmt.c

package info (click to toggle)
cpio 2.4.2-23
  • links: PTS
  • area: main
  • in suites: slink
  • size: 836 kB
  • ctags: 704
  • sloc: ansic: 7,997; makefile: 208; sh: 176
file content (291 lines) | stat: -rw-r--r-- 6,324 bytes parent folder | download | duplicates (2)
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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

/*
 * rmt
 */
#include <stdio.h>
#ifndef __linux
/* Kludge alert:  We should really fix this by having configure figure
   out if we need sgtty.h or not, so it can define HAVE_SGGTY_H and
   also add rmt to the build targets.  For now we'll just add this
   ifndef so make rmt will work on Linux.  */
#include <sgtty.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_GENTAPE_H	/* e.g., ISC UNIX */
#include <sys/gentape.h>
#else
#ifdef M_UNIX
#include <sys/tape.h>
#else
#include <sys/mtio.h>
#endif
#endif
#include <errno.h>

#if defined (_I386) && defined (_AIX)
#include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#else
long lseek ();
#endif

#ifdef STDC_HEADERS
#include <string.h>
#include <stdlib.h>
#else
extern char *malloc ();
#endif

int tape = -1;

char *record;
int maxrecsize = -1;
char *checkbuf ();
void getstring ();
void error ();

#define	SSIZE	64
char device[SSIZE];
char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];

extern errno;
extern const char *const _sys_errlist[];
char resp[BUFSIZ];

FILE *debug;
#define	DEBUG(f)	if (debug) fprintf(debug, f)
#define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
#define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)

int
main (argc, argv)
     int argc;
     char **argv;
{
  int rval;
  char c;
  int n, i, cc;

  argc--, argv++;
  if (argc > 0)
    {
      debug = fopen (*argv, "w");
      if (debug == 0)
	exit (1);
      (void) setbuf (debug, (char *) 0);
    }
top:
  errno = 0;
  rval = 0;
  if (read (0, &c, 1) != 1)
    exit (0);
  switch (c)
    {

    case 'O':
      if (tape >= 0)
	(void) close (tape);
      getstring (device);
      getstring (mode);
      DEBUG2 ("rmtd: O %s %s\n", device, mode);
#if defined (i386) && defined (AIX)
      /* This is alleged to fix a byte ordering problem. */
      /* I'm quite suspicious if it's right. -- mib */
      {
	int oflag = atoi (mode);
	int nflag = 0;
	if ((oflag & 3) == 0)
	  nflag |= O_RDONLY;
	if (oflag & 1)
	  nflag |= O_WRONLY;
	if (oflag & 2)
	  nflag |= O_RDWR;
	if (oflag & 0x0008)
	  nflag |= O_APPEND;
	if (oflag & 0x0200)
	  nflag |= O_CREAT;
	if (oflag & 0x0400)
	  nflag |= O_TRUNC;
	if (oflag & 0x0800)
	  nflag |= O_EXCL;
	tape = open (device, nflag, 0666);
      }
#else
      tape = open (device, atoi (mode), 0666);
#endif
      if (tape < 0)
	goto ioerror;
      goto respond;

    case 'C':
      DEBUG ("rmtd: C\n");
      getstring (device);	/* discard */
      if (close (tape) < 0)
	goto ioerror;
      tape = -1;
      goto respond;

    case 'L':
      getstring (count);
      getstring (pos);
      DEBUG2 ("rmtd: L %s %s\n", count, pos);
      rval = lseek (tape, (long) atoi (count), atoi (pos));
      if (rval < 0)
	goto ioerror;
      goto respond;

    case 'W':
      getstring (count);
      n = atoi (count);
      DEBUG1 ("rmtd: W %s\n", count);
      record = checkbuf (record, n);
      for (i = 0; i < n; i += cc)
	{
	  cc = read (0, &record[i], n - i);
	  if (cc <= 0)
	    {
	      DEBUG ("rmtd: premature eof\n");
	      exit (2);
	    }
	}
      rval = write (tape, record, n);
      if (rval < 0)
	goto ioerror;
      goto respond;

    case 'R':
      getstring (count);
      DEBUG1 ("rmtd: R %s\n", count);
      n = atoi (count);
      record = checkbuf (record, n);
      rval = read (tape, record, n);
      if (rval < 0)
	goto ioerror;
      (void) sprintf (resp, "A%d\n", rval);
      (void) write (1, resp, strlen (resp));
      (void) write (1, record, rval);
      goto top;

    case 'I':
      getstring (op);
      getstring (count);
      DEBUG2 ("rmtd: I %s %s\n", op, count);
#ifdef MTIOCTOP
      {
	struct mtop mtop;
	mtop.mt_op = atoi (op);
	mtop.mt_count = atoi (count);
	if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
	  goto ioerror;
	rval = mtop.mt_count;
      }
#endif
      goto respond;

    case 'S':			/* status */
      DEBUG ("rmtd: S\n");
      {
#ifdef MTIOCGET
	struct mtget mtget;
	if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
	  goto ioerror;
	rval = sizeof (mtget);
	(void) sprintf (resp, "A%d\n", rval);
	(void) write (1, resp, strlen (resp));
	(void) write (1, (char *) &mtget, sizeof (mtget));
#endif
	goto top;
      }

    default:
      DEBUG1 ("rmtd: garbage command %c\n", c);
      exit (3);
    }
respond:
  DEBUG1 ("rmtd: A %d\n", rval);
  (void) sprintf (resp, "A%d\n", rval);
  (void) write (1, resp, strlen (resp));
  goto top;
ioerror:
  error (errno);
  goto top;
}

void
getstring (bp)
     char *bp;
{
  int i;
  char *cp = bp;

  for (i = 0; i < SSIZE; i++)
    {
      if (read (0, cp + i, 1) != 1)
	exit (0);
      if (cp[i] == '\n')
	break;
    }
  cp[i] = '\0';
}

char *
checkbuf (record, size)
     char *record;
     int size;
{
  if (size <= maxrecsize)
    return (record);
  if (record != 0)
    free (record);
  record = malloc (size);
  if (record == 0)
    {
      DEBUG ("rmtd: cannot allocate buffer space\n");
      exit (4);
    }
  maxrecsize = size;
#ifdef SO_RCVBUF
  while (size > 1024 &&
   setsockopt (0, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof (size)) < 0)
    size -= 1024;
#else
  size = 1 + ((size - 1) % 1024);
#endif
  return (record);
}

void
error (num)
     int num;
{

  DEBUG2 ("rmtd: E %d (%s)\n", num, sys_errlist[num]);
  (void) sprintf (resp, "E%d\n%s\n", num, sys_errlist[num]);
  (void) write (1, resp, strlen (resp));
}