1/*-
2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
41#endif
42static const char rcsid[] =
| 1/*-
2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
41#endif
42static const char rcsid[] =
|
43 "$Id$";
| 43 "$Id: ar_io.c,v 1.10 1998/05/15 06:27:34 charnier Exp $";
|
44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <sys/ioctl.h>
49#include <sys/mtio.h>
50#include <signal.h>
51#include <string.h>
52#include <fcntl.h>
53#include <unistd.h>
54#include <stdio.h>
55#include <errno.h>
56#include <stdlib.h>
57#include "pax.h"
58#include "extern.h"
59
60/*
61 * Routines which deal directly with the archive I/O device/file.
62 */
63
64#define DMOD 0666 /* default mode of created archives */
65#define EXT_MODE O_RDONLY /* open mode for list/extract */
66#define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
67#define APP_MODE O_RDWR /* mode for append */
| 44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <sys/ioctl.h>
49#include <sys/mtio.h>
50#include <signal.h>
51#include <string.h>
52#include <fcntl.h>
53#include <unistd.h>
54#include <stdio.h>
55#include <errno.h>
56#include <stdlib.h>
57#include "pax.h"
58#include "extern.h"
59
60/*
61 * Routines which deal directly with the archive I/O device/file.
62 */
63
64#define DMOD 0666 /* default mode of created archives */
65#define EXT_MODE O_RDONLY /* open mode for list/extract */
66#define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
67#define APP_MODE O_RDWR /* mode for append */
|
68#define STDO "<STDOUT>" /* psuedo name for stdout */
69#define STDN "<STDIN>" /* psuedo name for stdin */
| 68#define STDO "<STDOUT>" /* pseudo name for stdout */
69#define STDN "<STDIN>" /* pseudo name for stdin */
|
70static int arfd = -1; /* archive file descriptor */
71static int artyp = ISREG; /* archive type: file/FIFO/tape */
72static int arvol = 1; /* archive volume number */
73static int lstrval = -1; /* return value from last i/o */
74static int io_ok; /* i/o worked on volume after resync */
75static int did_io; /* did i/o ever occur on volume? */
76static int done; /* set via tty termination */
77static struct stat arsb; /* stat of archive device at open */
78static int invld_rec; /* tape has out of spec record size */
79static int wr_trail = 1; /* trailer was rewritten in append */
80static int can_unlnk = 0; /* do we unlink null archives? */
81char *arcname; /* printable name of archive */
82
83static int get_phys __P((void));
84extern sigset_t s_mask;
85
86/*
87 * ar_open()
88 * Opens the next archive volume. Determines the type of the device and
89 * sets up block sizes as required by the archive device and the format.
90 * Note: we may be called with name == NULL on the first open only.
91 * Return:
92 * -1 on failure, 0 otherwise
93 */
94
95#if __STDC__
96int
97ar_open(char *name)
98#else
99int
100ar_open(name)
101 char *name;
102#endif
103{
104 struct mtget mb;
105
106 if (arfd != -1)
107 (void)close(arfd);
108 arfd = -1;
109 can_unlnk = did_io = io_ok = invld_rec = 0;
110 artyp = ISREG;
111 flcnt = 0;
112
113 /*
114 * open based on overall operation mode
115 */
116 switch (act) {
117 case LIST:
118 case EXTRACT:
119 if (name == NULL) {
120 arfd = STDIN_FILENO;
121 arcname = STDN;
122 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
123 sys_warn(0, errno, "Failed open to read on %s", name);
124 break;
125 case ARCHIVE:
126 if (name == NULL) {
127 arfd = STDOUT_FILENO;
128 arcname = STDO;
129 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
130 sys_warn(0, errno, "Failed open to write on %s", name);
131 else
132 can_unlnk = 1;
133 break;
134 case APPND:
135 if (name == NULL) {
136 arfd = STDOUT_FILENO;
137 arcname = STDO;
138 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
139 sys_warn(0, errno, "Failed open to read/write on %s",
140 name);
141 break;
142 case COPY:
143 /*
144 * arfd not used in COPY mode
145 */
146 arcname = "<NONE>";
147 lstrval = 1;
148 return(0);
149 }
150 if (arfd < 0)
151 return(-1);
152
153 /*
154 * set up is based on device type
155 */
156 if (fstat(arfd, &arsb) < 0) {
157 sys_warn(0, errno, "Failed stat on %s", arcname);
158 (void)close(arfd);
159 arfd = -1;
160 can_unlnk = 0;
161 return(-1);
162 }
163 if (S_ISDIR(arsb.st_mode)) {
164 pax_warn(0, "Cannot write an archive on top of a directory %s",
165 arcname);
166 (void)close(arfd);
167 arfd = -1;
168 can_unlnk = 0;
169 return(-1);
170 }
171
172 if (S_ISCHR(arsb.st_mode))
173 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
174 else if (S_ISBLK(arsb.st_mode))
175 artyp = ISBLK;
176 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
177 artyp = ISPIPE;
178 else
179 artyp = ISREG;
180
181 /*
182 * make sure we beyond any doubt that we only can unlink regular files
183 * we created
184 */
185 if (artyp != ISREG)
186 can_unlnk = 0;
187 /*
188 * if we are writing, we are done
189 */
190 if (act == ARCHIVE) {
191 blksz = rdblksz = wrblksz;
192 lstrval = 1;
193 return(0);
194 }
195
196 /*
197 * set default blksz on read. APPNDs writes rdblksz on the last volume
198 * On all new archive volumes, we shift to wrblksz (if the user
199 * specified one, otherwize we will continue to use rdblksz). We
200 * must to set blocksize based on what kind of device the archive is
201 * stored.
202 */
203 switch(artyp) {
204 case ISTAPE:
205 /*
206 * Tape drives come in at least two flavors. Those that support
207 * variable sized records and those that have fixed sized
208 * records. They must be treated differently. For tape drives
209 * that support variable sized records, we must make large
210 * reads to make sure we get the entire record, otherwise we
211 * will just get the first part of the record (up to size we
212 * asked). Tapes with fixed sized records may or may not return
213 * multiple records in a single read. We really do not care
214 * what the physical record size is UNLESS we are going to
215 * append. (We will need the physical block size to rewrite
216 * the trailer). Only when we are appending do we go to the
217 * effort to figure out the true PHYSICAL record size.
218 */
219 blksz = rdblksz = MAXBLK;
220 break;
221 case ISPIPE:
222 case ISBLK:
223 case ISCHR:
224 /*
225 * Blocksize is not a major issue with these devices (but must
226 * be kept a multiple of 512). If the user specified a write
227 * block size, we use that to read. Under append, we must
228 * always keep blksz == rdblksz. Otherwise we go ahead and use
229 * the device optimal blocksize as (and if) returned by stat
230 * and if it is within pax specs.
231 */
232 if ((act == APPND) && wrblksz) {
233 blksz = rdblksz = wrblksz;
234 break;
235 }
236
237 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
238 ((arsb.st_blksize % BLKMULT) == 0))
239 rdblksz = arsb.st_blksize;
240 else
241 rdblksz = DEVBLK;
242 /*
243 * For performance go for large reads when we can without harm
244 */
245 if ((act == APPND) || (artyp == ISCHR))
246 blksz = rdblksz;
247 else
248 blksz = MAXBLK;
249 break;
250 case ISREG:
251 /*
252 * if the user specified wrblksz works, use it. Under appends
253 * we must always keep blksz == rdblksz
254 */
255 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
256 blksz = rdblksz = wrblksz;
257 break;
258 }
259 /*
260 * See if we can find the blocking factor from the file size
261 */
262 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
263 if ((arsb.st_size % rdblksz) == 0)
264 break;
265 /*
| 70static int arfd = -1; /* archive file descriptor */
71static int artyp = ISREG; /* archive type: file/FIFO/tape */
72static int arvol = 1; /* archive volume number */
73static int lstrval = -1; /* return value from last i/o */
74static int io_ok; /* i/o worked on volume after resync */
75static int did_io; /* did i/o ever occur on volume? */
76static int done; /* set via tty termination */
77static struct stat arsb; /* stat of archive device at open */
78static int invld_rec; /* tape has out of spec record size */
79static int wr_trail = 1; /* trailer was rewritten in append */
80static int can_unlnk = 0; /* do we unlink null archives? */
81char *arcname; /* printable name of archive */
82
83static int get_phys __P((void));
84extern sigset_t s_mask;
85
86/*
87 * ar_open()
88 * Opens the next archive volume. Determines the type of the device and
89 * sets up block sizes as required by the archive device and the format.
90 * Note: we may be called with name == NULL on the first open only.
91 * Return:
92 * -1 on failure, 0 otherwise
93 */
94
95#if __STDC__
96int
97ar_open(char *name)
98#else
99int
100ar_open(name)
101 char *name;
102#endif
103{
104 struct mtget mb;
105
106 if (arfd != -1)
107 (void)close(arfd);
108 arfd = -1;
109 can_unlnk = did_io = io_ok = invld_rec = 0;
110 artyp = ISREG;
111 flcnt = 0;
112
113 /*
114 * open based on overall operation mode
115 */
116 switch (act) {
117 case LIST:
118 case EXTRACT:
119 if (name == NULL) {
120 arfd = STDIN_FILENO;
121 arcname = STDN;
122 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
123 sys_warn(0, errno, "Failed open to read on %s", name);
124 break;
125 case ARCHIVE:
126 if (name == NULL) {
127 arfd = STDOUT_FILENO;
128 arcname = STDO;
129 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
130 sys_warn(0, errno, "Failed open to write on %s", name);
131 else
132 can_unlnk = 1;
133 break;
134 case APPND:
135 if (name == NULL) {
136 arfd = STDOUT_FILENO;
137 arcname = STDO;
138 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
139 sys_warn(0, errno, "Failed open to read/write on %s",
140 name);
141 break;
142 case COPY:
143 /*
144 * arfd not used in COPY mode
145 */
146 arcname = "<NONE>";
147 lstrval = 1;
148 return(0);
149 }
150 if (arfd < 0)
151 return(-1);
152
153 /*
154 * set up is based on device type
155 */
156 if (fstat(arfd, &arsb) < 0) {
157 sys_warn(0, errno, "Failed stat on %s", arcname);
158 (void)close(arfd);
159 arfd = -1;
160 can_unlnk = 0;
161 return(-1);
162 }
163 if (S_ISDIR(arsb.st_mode)) {
164 pax_warn(0, "Cannot write an archive on top of a directory %s",
165 arcname);
166 (void)close(arfd);
167 arfd = -1;
168 can_unlnk = 0;
169 return(-1);
170 }
171
172 if (S_ISCHR(arsb.st_mode))
173 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
174 else if (S_ISBLK(arsb.st_mode))
175 artyp = ISBLK;
176 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
177 artyp = ISPIPE;
178 else
179 artyp = ISREG;
180
181 /*
182 * make sure we beyond any doubt that we only can unlink regular files
183 * we created
184 */
185 if (artyp != ISREG)
186 can_unlnk = 0;
187 /*
188 * if we are writing, we are done
189 */
190 if (act == ARCHIVE) {
191 blksz = rdblksz = wrblksz;
192 lstrval = 1;
193 return(0);
194 }
195
196 /*
197 * set default blksz on read. APPNDs writes rdblksz on the last volume
198 * On all new archive volumes, we shift to wrblksz (if the user
199 * specified one, otherwize we will continue to use rdblksz). We
200 * must to set blocksize based on what kind of device the archive is
201 * stored.
202 */
203 switch(artyp) {
204 case ISTAPE:
205 /*
206 * Tape drives come in at least two flavors. Those that support
207 * variable sized records and those that have fixed sized
208 * records. They must be treated differently. For tape drives
209 * that support variable sized records, we must make large
210 * reads to make sure we get the entire record, otherwise we
211 * will just get the first part of the record (up to size we
212 * asked). Tapes with fixed sized records may or may not return
213 * multiple records in a single read. We really do not care
214 * what the physical record size is UNLESS we are going to
215 * append. (We will need the physical block size to rewrite
216 * the trailer). Only when we are appending do we go to the
217 * effort to figure out the true PHYSICAL record size.
218 */
219 blksz = rdblksz = MAXBLK;
220 break;
221 case ISPIPE:
222 case ISBLK:
223 case ISCHR:
224 /*
225 * Blocksize is not a major issue with these devices (but must
226 * be kept a multiple of 512). If the user specified a write
227 * block size, we use that to read. Under append, we must
228 * always keep blksz == rdblksz. Otherwise we go ahead and use
229 * the device optimal blocksize as (and if) returned by stat
230 * and if it is within pax specs.
231 */
232 if ((act == APPND) && wrblksz) {
233 blksz = rdblksz = wrblksz;
234 break;
235 }
236
237 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
238 ((arsb.st_blksize % BLKMULT) == 0))
239 rdblksz = arsb.st_blksize;
240 else
241 rdblksz = DEVBLK;
242 /*
243 * For performance go for large reads when we can without harm
244 */
245 if ((act == APPND) || (artyp == ISCHR))
246 blksz = rdblksz;
247 else
248 blksz = MAXBLK;
249 break;
250 case ISREG:
251 /*
252 * if the user specified wrblksz works, use it. Under appends
253 * we must always keep blksz == rdblksz
254 */
255 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
256 blksz = rdblksz = wrblksz;
257 break;
258 }
259 /*
260 * See if we can find the blocking factor from the file size
261 */
262 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
263 if ((arsb.st_size % rdblksz) == 0)
264 break;
265 /*
|
266 * When we cannont find a match, we may have a flawed archive.
| 266 * When we cannot find a match, we may have a flawed archive.
|
267 */
268 if (rdblksz <= 0)
269 rdblksz = FILEBLK;
270 /*
271 * for performance go for large reads when we can
272 */
273 if (act == APPND)
274 blksz = rdblksz;
275 else
276 blksz = MAXBLK;
277 break;
278 default:
279 /*
280 * should never happen, worse case, slow...
281 */
282 blksz = rdblksz = BLKMULT;
283 break;
284 }
285 lstrval = 1;
286 return(0);
287}
288
289/*
290 * ar_close()
291 * closes archive device, increments volume number, and prints i/o summary
292 */
293#if __STDC__
294void
295ar_close(void)
296#else
297void
298ar_close()
299#endif
300{
301 FILE *outf;
302
303 if (arfd < 0) {
304 did_io = io_ok = flcnt = 0;
305 return;
306 }
307
308 if (act == LIST)
309 outf = stdout;
310 else
311 outf = stderr;
312
313 /*
314 * Close archive file. This may take a LONG while on tapes (we may be
315 * forced to wait for the rewind to complete) so tell the user what is
316 * going on (this avoids the user hitting control-c thinking pax is
317 * broken).
318 */
319 if (vflag && (artyp == ISTAPE)) {
320 if (vfpart)
321 (void)putc('\n', outf);
322 (void)fprintf(outf,
323 "%s: Waiting for tape drive close to complete...",
324 argv0);
325 (void)fflush(outf);
326 }
327
328 /*
329 * if nothing was written to the archive (and we created it), we remove
330 * it
331 */
332 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
333 (arsb.st_size == 0)) {
334 (void)unlink(arcname);
335 can_unlnk = 0;
336 }
337
338 (void)close(arfd);
339
340 if (vflag && (artyp == ISTAPE)) {
341 (void)fputs("done.\n", outf);
342 vfpart = 0;
343 (void)fflush(outf);
344 }
345 arfd = -1;
346
347 if (!io_ok && !did_io) {
348 flcnt = 0;
349 return;
350 }
351 did_io = io_ok = 0;
352
353 /*
354 * The volume number is only increased when the last device has data
355 * and we have already determined the archive format.
356 */
357 if (frmt != NULL)
358 ++arvol;
359
360 if (!vflag) {
361 flcnt = 0;
362 return;
363 }
364
365 /*
366 * Print out a summary of I/O for this archive volume.
367 */
368 if (vfpart) {
369 (void)putc('\n', outf);
370 vfpart = 0;
371 }
372
373 /*
374 * If we have not determined the format yet, we just say how many bytes
375 * we have skipped over looking for a header to id. there is no way we
376 * could have written anything yet.
377 */
378 if (frmt == NULL) {
379# ifdef NET2_STAT
380 (void)fprintf(outf, "%s: unknown format, %lu bytes skipped.\n",
381# else
382 (void)fprintf(outf, "%s: unknown format, %qu bytes skipped.\n",
383# endif
384 argv0, rdcnt);
385 (void)fflush(outf);
386 flcnt = 0;
387 return;
388 }
389
390 (void)fprintf(outf,
391# ifdef NET2_STAT
392 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
393# else
394 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
395# endif
396 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
397 (void)fflush(outf);
398 flcnt = 0;
399}
400
401/*
402 * ar_drain()
403 * drain any archive format independent padding from an archive read
404 * from a socket or a pipe. This is to prevent the process on the
405 * other side of the pipe from getting a SIGPIPE (pax will stop
406 * reading an archive once a format dependent trailer is detected).
407 */
408#if __STDC__
409void
410ar_drain(void)
411#else
412void
413ar_drain()
414#endif
415{
416 register int res;
417 char drbuf[MAXBLK];
418
419 /*
420 * we only drain from a pipe/socket. Other devices can be closed
421 * without reading up to end of file. We sure hope that pipe is closed
422 * on the other side so we will get an EOF.
423 */
424 if ((artyp != ISPIPE) || (lstrval <= 0))
425 return;
426
427 /*
428 * keep reading until pipe is drained
429 */
430 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
431 ;
432 lstrval = res;
433}
434
435/*
436 * ar_set_wr()
437 * Set up device right before switching from read to write in an append.
438 * device dependent code (if required) to do this should be added here.
439 * For all archive devices we are already positioned at the place we want
440 * to start writing when this routine is called.
441 * Return:
442 * 0 if all ready to write, -1 otherwise
443 */
444
445#if __STDC__
446int
447ar_set_wr(void)
448#else
449int
450ar_set_wr()
451#endif
452{
453 off_t cpos;
454
455 /*
456 * we must make sure the trailer is rewritten on append, ar_next()
457 * will stop us if the archive containing the trailer was not written
458 */
459 wr_trail = 0;
460
461 /*
462 * Add any device dependent code as required here
463 */
464 if (artyp != ISREG)
465 return(0);
466 /*
467 * Ok we have an archive in a regular file. If we were rewriting a
468 * file, we must get rid of all the stuff after the current offset
469 * (it was not written by pax).
470 */
471 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
472 (ftruncate(arfd, cpos) < 0)) {
473 sys_warn(1, errno, "Unable to truncate archive file");
474 return(-1);
475 }
476 return(0);
477}
478
479/*
480 * ar_app_ok()
481 * check if the last volume in the archive allows appends. We cannot check
482 * this until we are ready to write since there is no spec that says all
483 * volumes in a single archive have to be of the same type...
484 * Return:
485 * 0 if we can append, -1 otherwise.
486 */
487
488#if __STDC__
489int
490ar_app_ok(void)
491#else
492int
493ar_app_ok()
494#endif
495{
496 if (artyp == ISPIPE) {
497 pax_warn(1, "Cannot append to an archive obtained from a pipe.");
498 return(-1);
499 }
500
501 if (!invld_rec)
502 return(0);
503 pax_warn(1,"Cannot append, device record size %d does not support %s spec",
504 rdblksz, argv0);
505 return(-1);
506}
507
508/*
509 * ar_read()
510 * read up to a specified number of bytes from the archive into the
511 * supplied buffer. When dealing with tapes we may not always be able to
512 * read what we want.
513 * Return:
514 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
515 */
516
517#if __STDC__
518int
519ar_read(register char *buf, register int cnt)
520#else
521int
522ar_read(buf, cnt)
523 register char *buf;
524 register int cnt;
525#endif
526{
527 register int res = 0;
528
529 /*
530 * if last i/o was in error, no more reads until reset or new volume
531 */
532 if (lstrval <= 0)
533 return(lstrval);
534
535 /*
536 * how we read must be based on device type
537 */
538 switch (artyp) {
539 case ISTAPE:
540 if ((res = read(arfd, buf, cnt)) > 0) {
541 /*
542 * CAUTION: tape systems may not always return the same
543 * sized records so we leave blksz == MAXBLK. The
544 * physical record size that a tape drive supports is
545 * very hard to determine in a uniform and portable
546 * manner.
547 */
548 io_ok = 1;
549 if (res != rdblksz) {
550 /*
551 * Record size changed. If this is happens on
552 * any record after the first, we probably have
553 * a tape drive which has a fixed record size
554 * we are getting multiple records in a single
555 * read). Watch out for record blocking that
556 * violates pax spec (must be a multiple of
557 * BLKMULT).
558 */
559 rdblksz = res;
560 if (rdblksz % BLKMULT)
561 invld_rec = 1;
562 }
563 return(res);
564 }
565 break;
566 case ISREG:
567 case ISBLK:
568 case ISCHR:
569 case ISPIPE:
570 default:
571 /*
572 * Files are so easy to deal with. These other things cannot
573 * be trusted at all. So when we are dealing with character
574 * devices and pipes we just take what they have ready for us
575 * and return. Trying to do anything else with them runs the
576 * risk of failure.
577 */
578 if ((res = read(arfd, buf, cnt)) > 0) {
579 io_ok = 1;
580 return(res);
581 }
582 break;
583 }
584
585 /*
586 * We are in trouble at this point, something is broken...
587 */
588 lstrval = res;
589 if (res < 0)
590 sys_warn(1, errno, "Failed read on archive volume %d", arvol);
591 else
592 pax_warn(0, "End of archive volume %d reached", arvol);
593 return(res);
594}
595
596/*
597 * ar_write()
598 * Write a specified number of bytes in supplied buffer to the archive
599 * device so it appears as a single "block". Deals with errors and tries
600 * to recover when faced with short writes.
601 * Return:
602 * Number of bytes written. 0 indicates end of volume reached and with no
603 * flaws (as best that can be detected). A -1 indicates an unrecoverable
604 * error in the archive occured.
605 */
606
607#if __STDC__
608int
609ar_write(register char *buf, register int bsz)
610#else
611int
612ar_write(buf, bsz)
613 register char *buf;
614 register int bsz;
615#endif
616{
617 register int res;
618 off_t cpos;
619
620 /*
621 * do not allow pax to create a "bad" archive. Once a write fails on
622 * an archive volume prevent further writes to it.
623 */
624 if (lstrval <= 0)
625 return(lstrval);
626
627 if ((res = write(arfd, buf, bsz)) == bsz) {
628 wr_trail = 1;
629 io_ok = 1;
630 return(bsz);
631 }
632 /*
633 * write broke, see what we can do with it. We try to send any partial
634 * writes that may violate pax spec to the next archive volume.
635 */
636 if (res < 0)
637 lstrval = res;
638 else
639 lstrval = 0;
640
641 switch (artyp) {
642 case ISREG:
643 if ((res > 0) && (res % BLKMULT)) {
644 /*
645 * try to fix up partial writes which are not BLKMULT
646 * in size by forcing the runt record to next archive
647 * volume
648 */
649 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
650 break;
651 cpos -= (off_t)res;
652 if (ftruncate(arfd, cpos) < 0)
653 break;
654 res = lstrval = 0;
655 break;
656 }
657 if (res >= 0)
658 break;
659 /*
660 * if file is out of space, handle it like a return of 0
661 */
662 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
663 res = lstrval = 0;
664 break;
665 case ISTAPE:
666 case ISCHR:
667 case ISBLK:
668 if (res >= 0)
669 break;
670 if (errno == EACCES) {
671 pax_warn(0, "Write failed, archive is write protected.");
672 res = lstrval = 0;
673 return(0);
674 }
675 /*
676 * see if we reached the end of media, if so force a change to
677 * the next volume
678 */
679 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
680 res = lstrval = 0;
681 break;
682 case ISPIPE:
683 default:
684 /*
685 * we cannot fix errors to these devices
686 */
687 break;
688 }
689
690 /*
691 * Better tell the user the bad news...
692 * if this is a block aligned archive format, we may have a bad archive
| 267 */
268 if (rdblksz <= 0)
269 rdblksz = FILEBLK;
270 /*
271 * for performance go for large reads when we can
272 */
273 if (act == APPND)
274 blksz = rdblksz;
275 else
276 blksz = MAXBLK;
277 break;
278 default:
279 /*
280 * should never happen, worse case, slow...
281 */
282 blksz = rdblksz = BLKMULT;
283 break;
284 }
285 lstrval = 1;
286 return(0);
287}
288
289/*
290 * ar_close()
291 * closes archive device, increments volume number, and prints i/o summary
292 */
293#if __STDC__
294void
295ar_close(void)
296#else
297void
298ar_close()
299#endif
300{
301 FILE *outf;
302
303 if (arfd < 0) {
304 did_io = io_ok = flcnt = 0;
305 return;
306 }
307
308 if (act == LIST)
309 outf = stdout;
310 else
311 outf = stderr;
312
313 /*
314 * Close archive file. This may take a LONG while on tapes (we may be
315 * forced to wait for the rewind to complete) so tell the user what is
316 * going on (this avoids the user hitting control-c thinking pax is
317 * broken).
318 */
319 if (vflag && (artyp == ISTAPE)) {
320 if (vfpart)
321 (void)putc('\n', outf);
322 (void)fprintf(outf,
323 "%s: Waiting for tape drive close to complete...",
324 argv0);
325 (void)fflush(outf);
326 }
327
328 /*
329 * if nothing was written to the archive (and we created it), we remove
330 * it
331 */
332 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
333 (arsb.st_size == 0)) {
334 (void)unlink(arcname);
335 can_unlnk = 0;
336 }
337
338 (void)close(arfd);
339
340 if (vflag && (artyp == ISTAPE)) {
341 (void)fputs("done.\n", outf);
342 vfpart = 0;
343 (void)fflush(outf);
344 }
345 arfd = -1;
346
347 if (!io_ok && !did_io) {
348 flcnt = 0;
349 return;
350 }
351 did_io = io_ok = 0;
352
353 /*
354 * The volume number is only increased when the last device has data
355 * and we have already determined the archive format.
356 */
357 if (frmt != NULL)
358 ++arvol;
359
360 if (!vflag) {
361 flcnt = 0;
362 return;
363 }
364
365 /*
366 * Print out a summary of I/O for this archive volume.
367 */
368 if (vfpart) {
369 (void)putc('\n', outf);
370 vfpart = 0;
371 }
372
373 /*
374 * If we have not determined the format yet, we just say how many bytes
375 * we have skipped over looking for a header to id. there is no way we
376 * could have written anything yet.
377 */
378 if (frmt == NULL) {
379# ifdef NET2_STAT
380 (void)fprintf(outf, "%s: unknown format, %lu bytes skipped.\n",
381# else
382 (void)fprintf(outf, "%s: unknown format, %qu bytes skipped.\n",
383# endif
384 argv0, rdcnt);
385 (void)fflush(outf);
386 flcnt = 0;
387 return;
388 }
389
390 (void)fprintf(outf,
391# ifdef NET2_STAT
392 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
393# else
394 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
395# endif
396 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
397 (void)fflush(outf);
398 flcnt = 0;
399}
400
401/*
402 * ar_drain()
403 * drain any archive format independent padding from an archive read
404 * from a socket or a pipe. This is to prevent the process on the
405 * other side of the pipe from getting a SIGPIPE (pax will stop
406 * reading an archive once a format dependent trailer is detected).
407 */
408#if __STDC__
409void
410ar_drain(void)
411#else
412void
413ar_drain()
414#endif
415{
416 register int res;
417 char drbuf[MAXBLK];
418
419 /*
420 * we only drain from a pipe/socket. Other devices can be closed
421 * without reading up to end of file. We sure hope that pipe is closed
422 * on the other side so we will get an EOF.
423 */
424 if ((artyp != ISPIPE) || (lstrval <= 0))
425 return;
426
427 /*
428 * keep reading until pipe is drained
429 */
430 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
431 ;
432 lstrval = res;
433}
434
435/*
436 * ar_set_wr()
437 * Set up device right before switching from read to write in an append.
438 * device dependent code (if required) to do this should be added here.
439 * For all archive devices we are already positioned at the place we want
440 * to start writing when this routine is called.
441 * Return:
442 * 0 if all ready to write, -1 otherwise
443 */
444
445#if __STDC__
446int
447ar_set_wr(void)
448#else
449int
450ar_set_wr()
451#endif
452{
453 off_t cpos;
454
455 /*
456 * we must make sure the trailer is rewritten on append, ar_next()
457 * will stop us if the archive containing the trailer was not written
458 */
459 wr_trail = 0;
460
461 /*
462 * Add any device dependent code as required here
463 */
464 if (artyp != ISREG)
465 return(0);
466 /*
467 * Ok we have an archive in a regular file. If we were rewriting a
468 * file, we must get rid of all the stuff after the current offset
469 * (it was not written by pax).
470 */
471 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
472 (ftruncate(arfd, cpos) < 0)) {
473 sys_warn(1, errno, "Unable to truncate archive file");
474 return(-1);
475 }
476 return(0);
477}
478
479/*
480 * ar_app_ok()
481 * check if the last volume in the archive allows appends. We cannot check
482 * this until we are ready to write since there is no spec that says all
483 * volumes in a single archive have to be of the same type...
484 * Return:
485 * 0 if we can append, -1 otherwise.
486 */
487
488#if __STDC__
489int
490ar_app_ok(void)
491#else
492int
493ar_app_ok()
494#endif
495{
496 if (artyp == ISPIPE) {
497 pax_warn(1, "Cannot append to an archive obtained from a pipe.");
498 return(-1);
499 }
500
501 if (!invld_rec)
502 return(0);
503 pax_warn(1,"Cannot append, device record size %d does not support %s spec",
504 rdblksz, argv0);
505 return(-1);
506}
507
508/*
509 * ar_read()
510 * read up to a specified number of bytes from the archive into the
511 * supplied buffer. When dealing with tapes we may not always be able to
512 * read what we want.
513 * Return:
514 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
515 */
516
517#if __STDC__
518int
519ar_read(register char *buf, register int cnt)
520#else
521int
522ar_read(buf, cnt)
523 register char *buf;
524 register int cnt;
525#endif
526{
527 register int res = 0;
528
529 /*
530 * if last i/o was in error, no more reads until reset or new volume
531 */
532 if (lstrval <= 0)
533 return(lstrval);
534
535 /*
536 * how we read must be based on device type
537 */
538 switch (artyp) {
539 case ISTAPE:
540 if ((res = read(arfd, buf, cnt)) > 0) {
541 /*
542 * CAUTION: tape systems may not always return the same
543 * sized records so we leave blksz == MAXBLK. The
544 * physical record size that a tape drive supports is
545 * very hard to determine in a uniform and portable
546 * manner.
547 */
548 io_ok = 1;
549 if (res != rdblksz) {
550 /*
551 * Record size changed. If this is happens on
552 * any record after the first, we probably have
553 * a tape drive which has a fixed record size
554 * we are getting multiple records in a single
555 * read). Watch out for record blocking that
556 * violates pax spec (must be a multiple of
557 * BLKMULT).
558 */
559 rdblksz = res;
560 if (rdblksz % BLKMULT)
561 invld_rec = 1;
562 }
563 return(res);
564 }
565 break;
566 case ISREG:
567 case ISBLK:
568 case ISCHR:
569 case ISPIPE:
570 default:
571 /*
572 * Files are so easy to deal with. These other things cannot
573 * be trusted at all. So when we are dealing with character
574 * devices and pipes we just take what they have ready for us
575 * and return. Trying to do anything else with them runs the
576 * risk of failure.
577 */
578 if ((res = read(arfd, buf, cnt)) > 0) {
579 io_ok = 1;
580 return(res);
581 }
582 break;
583 }
584
585 /*
586 * We are in trouble at this point, something is broken...
587 */
588 lstrval = res;
589 if (res < 0)
590 sys_warn(1, errno, "Failed read on archive volume %d", arvol);
591 else
592 pax_warn(0, "End of archive volume %d reached", arvol);
593 return(res);
594}
595
596/*
597 * ar_write()
598 * Write a specified number of bytes in supplied buffer to the archive
599 * device so it appears as a single "block". Deals with errors and tries
600 * to recover when faced with short writes.
601 * Return:
602 * Number of bytes written. 0 indicates end of volume reached and with no
603 * flaws (as best that can be detected). A -1 indicates an unrecoverable
604 * error in the archive occured.
605 */
606
607#if __STDC__
608int
609ar_write(register char *buf, register int bsz)
610#else
611int
612ar_write(buf, bsz)
613 register char *buf;
614 register int bsz;
615#endif
616{
617 register int res;
618 off_t cpos;
619
620 /*
621 * do not allow pax to create a "bad" archive. Once a write fails on
622 * an archive volume prevent further writes to it.
623 */
624 if (lstrval <= 0)
625 return(lstrval);
626
627 if ((res = write(arfd, buf, bsz)) == bsz) {
628 wr_trail = 1;
629 io_ok = 1;
630 return(bsz);
631 }
632 /*
633 * write broke, see what we can do with it. We try to send any partial
634 * writes that may violate pax spec to the next archive volume.
635 */
636 if (res < 0)
637 lstrval = res;
638 else
639 lstrval = 0;
640
641 switch (artyp) {
642 case ISREG:
643 if ((res > 0) && (res % BLKMULT)) {
644 /*
645 * try to fix up partial writes which are not BLKMULT
646 * in size by forcing the runt record to next archive
647 * volume
648 */
649 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
650 break;
651 cpos -= (off_t)res;
652 if (ftruncate(arfd, cpos) < 0)
653 break;
654 res = lstrval = 0;
655 break;
656 }
657 if (res >= 0)
658 break;
659 /*
660 * if file is out of space, handle it like a return of 0
661 */
662 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
663 res = lstrval = 0;
664 break;
665 case ISTAPE:
666 case ISCHR:
667 case ISBLK:
668 if (res >= 0)
669 break;
670 if (errno == EACCES) {
671 pax_warn(0, "Write failed, archive is write protected.");
672 res = lstrval = 0;
673 return(0);
674 }
675 /*
676 * see if we reached the end of media, if so force a change to
677 * the next volume
678 */
679 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
680 res = lstrval = 0;
681 break;
682 case ISPIPE:
683 default:
684 /*
685 * we cannot fix errors to these devices
686 */
687 break;
688 }
689
690 /*
691 * Better tell the user the bad news...
692 * if this is a block aligned archive format, we may have a bad archive
|
693 * if the format wants the header to start at a BLKMULT boundry. While
| 693 * if the format wants the header to start at a BLKMULT boundary. While
|
694 * we can deal with the mis-aligned data, it violates spec and other
695 * archive readers will likely fail. if the format is not block
696 * aligned, the user may be lucky (and the archive is ok).
697 */
698 if (res >= 0) {
699 if (res > 0)
700 wr_trail = 1;
701 io_ok = 1;
702 }
703
704 /*
705 * If we were trying to rewrite the trailer and it didn't work, we
706 * must quit right away.
707 */
708 if (!wr_trail && (res <= 0)) {
709 pax_warn(1,"Unable to append, trailer re-write failed. Quitting.");
710 return(res);
711 }
712
713 if (res == 0)
714 pax_warn(0, "End of archive volume %d reached", arvol);
715 else if (res < 0)
716 sys_warn(1, errno, "Failed write to archive volume: %d", arvol);
717 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
718 pax_warn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
719 else
720 pax_warn(1,"WARNING: partial archive write. Archive IS FLAWED");
721 return(res);
722}
723
724/*
725 * ar_rdsync()
726 * Try to move past a bad spot on a flawed archive as needed to continue
727 * I/O. Clears error flags to allow I/O to continue.
728 * Return:
729 * 0 when ok to try i/o again, -1 otherwise.
730 */
731
732#if __STDC__
733int
734ar_rdsync(void)
735#else
736int
737ar_rdsync()
738#endif
739{
740 long fsbz;
741 off_t cpos;
742 off_t mpos;
743 struct mtop mb;
744
745 /*
746 * Fail resync attempts at user request (done) or this is going to be
747 * an update/append to a existing archive. if last i/o hit media end,
748 * we need to go to the next volume not try a resync
749 */
750 if ((done > 0) || (lstrval == 0))
751 return(-1);
752
753 if ((act == APPND) || (act == ARCHIVE)) {
754 pax_warn(1, "Cannot allow updates to an archive with flaws.");
755 return(-1);
756 }
757 if (io_ok)
758 did_io = 1;
759
760 switch(artyp) {
761 case ISTAPE:
762 /*
763 * if the last i/o was a successful data transfer, we assume
764 * the fault is just a bad record on the tape that we are now
765 * past. If we did not get any data since the last resync try
| 694 * we can deal with the mis-aligned data, it violates spec and other
695 * archive readers will likely fail. if the format is not block
696 * aligned, the user may be lucky (and the archive is ok).
697 */
698 if (res >= 0) {
699 if (res > 0)
700 wr_trail = 1;
701 io_ok = 1;
702 }
703
704 /*
705 * If we were trying to rewrite the trailer and it didn't work, we
706 * must quit right away.
707 */
708 if (!wr_trail && (res <= 0)) {
709 pax_warn(1,"Unable to append, trailer re-write failed. Quitting.");
710 return(res);
711 }
712
713 if (res == 0)
714 pax_warn(0, "End of archive volume %d reached", arvol);
715 else if (res < 0)
716 sys_warn(1, errno, "Failed write to archive volume: %d", arvol);
717 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
718 pax_warn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
719 else
720 pax_warn(1,"WARNING: partial archive write. Archive IS FLAWED");
721 return(res);
722}
723
724/*
725 * ar_rdsync()
726 * Try to move past a bad spot on a flawed archive as needed to continue
727 * I/O. Clears error flags to allow I/O to continue.
728 * Return:
729 * 0 when ok to try i/o again, -1 otherwise.
730 */
731
732#if __STDC__
733int
734ar_rdsync(void)
735#else
736int
737ar_rdsync()
738#endif
739{
740 long fsbz;
741 off_t cpos;
742 off_t mpos;
743 struct mtop mb;
744
745 /*
746 * Fail resync attempts at user request (done) or this is going to be
747 * an update/append to a existing archive. if last i/o hit media end,
748 * we need to go to the next volume not try a resync
749 */
750 if ((done > 0) || (lstrval == 0))
751 return(-1);
752
753 if ((act == APPND) || (act == ARCHIVE)) {
754 pax_warn(1, "Cannot allow updates to an archive with flaws.");
755 return(-1);
756 }
757 if (io_ok)
758 did_io = 1;
759
760 switch(artyp) {
761 case ISTAPE:
762 /*
763 * if the last i/o was a successful data transfer, we assume
764 * the fault is just a bad record on the tape that we are now
765 * past. If we did not get any data since the last resync try
|
766 * to move the tape foward one PHYSICAL record past any
| 766 * to move the tape forward one PHYSICAL record past any
|
767 * damaged tape section. Some tape drives are stubborn and need
768 * to be pushed.
769 */
770 if (io_ok) {
771 io_ok = 0;
772 lstrval = 1;
773 break;
774 }
775 mb.mt_op = MTFSR;
776 mb.mt_count = 1;
777 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
778 break;
779 lstrval = 1;
780 break;
781 case ISREG:
782 case ISCHR:
783 case ISBLK:
784 /*
785 * try to step over the bad part of the device.
786 */
787 io_ok = 0;
788 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
789 fsbz = BLKMULT;
790 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
791 break;
792 mpos = fsbz - (cpos % (off_t)fsbz);
793 if (lseek(arfd, mpos, SEEK_CUR) < 0)
794 break;
795 lstrval = 1;
796 break;
797 case ISPIPE:
798 default:
799 /*
800 * cannot recover on these archive device types
801 */
802 io_ok = 0;
803 break;
804 }
805 if (lstrval <= 0) {
806 pax_warn(1, "Unable to recover from an archive read failure.");
807 return(-1);
808 }
809 pax_warn(0, "Attempting to recover from an archive read failure.");
810 return(0);
811}
812
813/*
814 * ar_fow()
815 * Move the I/O position within the archive foward the specified number of
816 * bytes as supported by the device. If we cannot move the requested
817 * number of bytes, return the actual number of bytes moved in skipped.
818 * Return:
819 * 0 if moved the requested distance, -1 on complete failure, 1 on
820 * partial move (the amount moved is in skipped)
821 */
822
823#if __STDC__
824int
825ar_fow(off_t sksz, off_t *skipped)
826#else
827int
828ar_fow(sksz, skipped)
829 off_t sksz;
830 off_t *skipped;
831#endif
832{
833 off_t cpos;
834 off_t mpos;
835
836 *skipped = 0;
837 if (sksz <= 0)
838 return(0);
839
840 /*
841 * we cannot move foward at EOF or error
842 */
843 if (lstrval <= 0)
844 return(lstrval);
845
846 /*
847 * Safer to read forward on devices where it is hard to find the end of
848 * the media without reading to it. With tapes we cannot be sure of the
849 * number of physical blocks to skip (we do not know physical block
850 * size at this point), so we must only read foward on tapes!
851 */
852 if (artyp != ISREG)
853 return(0);
854
855 /*
856 * figure out where we are in the archive
857 */
858 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
859 /*
860 * we can be asked to move farther than there are bytes in this
861 * volume, if so, just go to file end and let normal buf_fill()
862 * deal with the end of file (it will go to next volume by
863 * itself)
864 */
865 if ((mpos = cpos + sksz) > arsb.st_size) {
866 *skipped = arsb.st_size - cpos;
867 mpos = arsb.st_size;
868 } else
869 *skipped = sksz;
870 if (lseek(arfd, mpos, SEEK_SET) >= 0)
871 return(0);
872 }
| 767 * damaged tape section. Some tape drives are stubborn and need
768 * to be pushed.
769 */
770 if (io_ok) {
771 io_ok = 0;
772 lstrval = 1;
773 break;
774 }
775 mb.mt_op = MTFSR;
776 mb.mt_count = 1;
777 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
778 break;
779 lstrval = 1;
780 break;
781 case ISREG:
782 case ISCHR:
783 case ISBLK:
784 /*
785 * try to step over the bad part of the device.
786 */
787 io_ok = 0;
788 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
789 fsbz = BLKMULT;
790 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
791 break;
792 mpos = fsbz - (cpos % (off_t)fsbz);
793 if (lseek(arfd, mpos, SEEK_CUR) < 0)
794 break;
795 lstrval = 1;
796 break;
797 case ISPIPE:
798 default:
799 /*
800 * cannot recover on these archive device types
801 */
802 io_ok = 0;
803 break;
804 }
805 if (lstrval <= 0) {
806 pax_warn(1, "Unable to recover from an archive read failure.");
807 return(-1);
808 }
809 pax_warn(0, "Attempting to recover from an archive read failure.");
810 return(0);
811}
812
813/*
814 * ar_fow()
815 * Move the I/O position within the archive foward the specified number of
816 * bytes as supported by the device. If we cannot move the requested
817 * number of bytes, return the actual number of bytes moved in skipped.
818 * Return:
819 * 0 if moved the requested distance, -1 on complete failure, 1 on
820 * partial move (the amount moved is in skipped)
821 */
822
823#if __STDC__
824int
825ar_fow(off_t sksz, off_t *skipped)
826#else
827int
828ar_fow(sksz, skipped)
829 off_t sksz;
830 off_t *skipped;
831#endif
832{
833 off_t cpos;
834 off_t mpos;
835
836 *skipped = 0;
837 if (sksz <= 0)
838 return(0);
839
840 /*
841 * we cannot move foward at EOF or error
842 */
843 if (lstrval <= 0)
844 return(lstrval);
845
846 /*
847 * Safer to read forward on devices where it is hard to find the end of
848 * the media without reading to it. With tapes we cannot be sure of the
849 * number of physical blocks to skip (we do not know physical block
850 * size at this point), so we must only read foward on tapes!
851 */
852 if (artyp != ISREG)
853 return(0);
854
855 /*
856 * figure out where we are in the archive
857 */
858 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
859 /*
860 * we can be asked to move farther than there are bytes in this
861 * volume, if so, just go to file end and let normal buf_fill()
862 * deal with the end of file (it will go to next volume by
863 * itself)
864 */
865 if ((mpos = cpos + sksz) > arsb.st_size) {
866 *skipped = arsb.st_size - cpos;
867 mpos = arsb.st_size;
868 } else
869 *skipped = sksz;
870 if (lseek(arfd, mpos, SEEK_SET) >= 0)
871 return(0);
872 }
|
873 sys_warn(1, errno, "Foward positioning operation on archive failed");
| 873 sys_warn(1, errno, "Forward positioning operation on archive failed");
|
874 lstrval = -1;
875 return(-1);
876}
877
878/*
879 * ar_rev()
880 * move the i/o position within the archive backwards the specified byte
881 * count as supported by the device. With tapes drives we RESET rdblksz to
882 * the PHYSICAL blocksize.
883 * NOTE: We should only be called to move backwards so we can rewrite the
884 * last records (the trailer) of an archive (APPEND).
885 * Return:
886 * 0 if moved the requested distance, -1 on complete failure
887 */
888
889#if __STDC__
890int
891ar_rev(off_t sksz)
892#else
893int
894ar_rev(sksz)
895 off_t sksz;
896#endif
897{
898 off_t cpos;
899 struct mtop mb;
900 register int phyblk;
901
902 /*
903 * make sure we do not have try to reverse on a flawed archive
904 */
905 if (lstrval < 0)
906 return(lstrval);
907
908 switch(artyp) {
909 case ISPIPE:
910 if (sksz <= 0)
911 break;
912 /*
913 * cannot go backwards on these critters
914 */
915 pax_warn(1, "Reverse positioning on pipes is not supported.");
916 lstrval = -1;
917 return(-1);
918 case ISREG:
919 case ISBLK:
920 case ISCHR:
921 default:
922 if (sksz <= 0)
923 break;
924
925 /*
926 * For things other than files, backwards movement has a very
927 * high probability of failure as we really do not know the
928 * true attributes of the device we are talking to (the device
929 * may not even have the ability to lseek() in any direction).
930 * First we figure out where we are in the archive.
931 */
932 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
933 sys_warn(1, errno,
934 "Unable to obtain current archive byte offset");
935 lstrval = -1;
936 return(-1);
937 }
938
939 /*
940 * we may try to go backwards past the start when the archive
941 * is only a single record. If this hapens and we are on a
942 * multi volume archive, we need to go to the end of the
943 * previous volume and continue our movement backwards from
944 * there.
945 */
946 if ((cpos -= sksz) < (off_t)0L) {
947 if (arvol > 1) {
948 /*
949 * this should never happen
950 */
951 pax_warn(1,"Reverse position on previous volume.");
952 lstrval = -1;
953 return(-1);
954 }
955 cpos = (off_t)0L;
956 }
957 if (lseek(arfd, cpos, SEEK_SET) < 0) {
958 sys_warn(1, errno, "Unable to seek archive backwards");
959 lstrval = -1;
960 return(-1);
961 }
962 break;
963 case ISTAPE:
964 /*
965 * Calculate and move the proper number of PHYSICAL tape
966 * blocks. If the sksz is not an even multiple of the physical
967 * tape size, we cannot do the move (this should never happen).
968 * (We also cannot handler trailers spread over two vols).
969 * get_phys() also makes sure we are in front of the filemark.
970 */
971 if ((phyblk = get_phys()) <= 0) {
972 lstrval = -1;
973 return(-1);
974 }
975
976 /*
977 * make sure future tape reads only go by physical tape block
978 * size (set rdblksz to the real size).
979 */
980 rdblksz = phyblk;
981
982 /*
983 * if no movement is required, just return (we must be after
984 * get_phys() so the physical blocksize is properly set)
985 */
986 if (sksz <= 0)
987 break;
988
989 /*
990 * ok we have to move. Make sure the tape drive can do it.
991 */
992 if (sksz % phyblk) {
993 pax_warn(1,
994 "Tape drive unable to backspace requested amount");
995 lstrval = -1;
996 return(-1);
997 }
998
999 /*
1000 * move backwards the requested number of bytes
1001 */
1002 mb.mt_op = MTBSR;
1003 mb.mt_count = sksz/phyblk;
1004 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1005 sys_warn(1,errno, "Unable to backspace tape %d blocks.",
1006 mb.mt_count);
1007 lstrval = -1;
1008 return(-1);
1009 }
1010 break;
1011 }
1012 lstrval = 1;
1013 return(0);
1014}
1015
1016/*
1017 * get_phys()
1018 * Determine the physical block size on a tape drive. We need the physical
1019 * block size so we know how many bytes we skip over when we move with
1020 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
1021 * return.
1022 * This is one really SLOW routine...
1023 * Return:
1024 * physical block size if ok (ok > 0), -1 otherwise
1025 */
1026
1027#if __STDC__
1028static int
1029get_phys(void)
1030#else
1031static int
1032get_phys()
1033#endif
1034{
1035 register int padsz = 0;
1036 register int res;
1037 register int phyblk;
1038 struct mtop mb;
1039 char scbuf[MAXBLK];
1040
1041 /*
1042 * move to the file mark, and then back up one record and read it.
1043 * this should tell us the physical record size the tape is using.
1044 */
1045 if (lstrval == 1) {
1046 /*
1047 * we know we are at file mark when we get back a 0 from
1048 * read()
1049 */
1050 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1051 padsz += res;
1052 if (res < 0) {
1053 sys_warn(1, errno, "Unable to locate tape filemark.");
1054 return(-1);
1055 }
1056 }
1057
1058 /*
1059 * move backwards over the file mark so we are at the end of the
1060 * last record.
1061 */
1062 mb.mt_op = MTBSF;
1063 mb.mt_count = 1;
1064 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1065 sys_warn(1, errno, "Unable to backspace over tape filemark.");
1066 return(-1);
1067 }
1068
1069 /*
1070 * move backwards so we are in front of the last record and read it to
1071 * get physical tape blocksize.
1072 */
1073 mb.mt_op = MTBSR;
1074 mb.mt_count = 1;
1075 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1076 sys_warn(1, errno, "Unable to backspace over last tape block.");
1077 return(-1);
1078 }
1079 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1080 sys_warn(1, errno, "Cannot determine archive tape blocksize.");
1081 return(-1);
1082 }
1083
1084 /*
1085 * read foward to the file mark, then back up in front of the filemark
1086 * (this is a bit paranoid, but should be safe to do).
1087 */
1088 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1089 ;
1090 if (res < 0) {
1091 sys_warn(1, errno, "Unable to locate tape filemark.");
1092 return(-1);
1093 }
1094 mb.mt_op = MTBSF;
1095 mb.mt_count = 1;
1096 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1097 sys_warn(1, errno, "Unable to backspace over tape filemark.");
1098 return(-1);
1099 }
1100
1101 /*
1102 * set lstrval so we know that the filemark has not been seen
1103 */
1104 lstrval = 1;
1105
1106 /*
1107 * return if there was no padding
1108 */
1109 if (padsz == 0)
1110 return(phyblk);
1111
1112 /*
1113 * make sure we can move backwards over the padding. (this should
1114 * never fail).
1115 */
1116 if (padsz % phyblk) {
1117 pax_warn(1, "Tape drive unable to backspace requested amount");
1118 return(-1);
1119 }
1120
1121 /*
1122 * move backwards over the padding so the head is where it was when
1123 * we were first called (if required).
1124 */
1125 mb.mt_op = MTBSR;
1126 mb.mt_count = padsz/phyblk;
1127 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1128 sys_warn(1,errno,"Unable to backspace tape over %d pad blocks",
1129 mb.mt_count);
1130 return(-1);
1131 }
1132 return(phyblk);
1133}
1134
1135/*
1136 * ar_next()
1137 * prompts the user for the next volume in this archive. For some devices
1138 * we may allow the media to be changed. Otherwise a new archive is
1139 * prompted for. By pax spec, if there is no controlling tty or an eof is
1140 * read on tty input, we must quit pax.
1141 * Return:
1142 * 0 when ready to continue, -1 when all done
1143 */
1144
1145#if __STDC__
1146int
1147ar_next(void)
1148#else
1149int
1150ar_next()
1151#endif
1152{
1153 char buf[PAXPATHLEN+2];
1154 static int freeit = 0;
1155 sigset_t o_mask;
1156
1157 /*
1158 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1159 * things like writing EOF etc will be done) (Watch out ar_close() can
1160 * also be called via a signal handler, so we must prevent a race.
1161 */
1162 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1163 sys_warn(0, errno, "Unable to set signal mask");
1164 ar_close();
1165 if (sigprocmask(SIG_SETMASK, &o_mask, (sigset_t *)NULL) < 0)
1166 sys_warn(0, errno, "Unable to restore signal mask");
1167
1168 if (done || !wr_trail)
1169 return(-1);
1170
1171 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1172
1173 /*
1174 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1175 * the name), the user will be forced to type it in.
1176 */
1177 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1178 && (artyp != ISPIPE)) {
1179 if (artyp == ISTAPE) {
1180 tty_prnt("%s ready for archive tape volume: %d\n",
1181 arcname, arvol);
1182 tty_prnt("Load the NEXT TAPE on the tape drive");
1183 } else {
1184 tty_prnt("%s ready for archive volume: %d\n",
1185 arcname, arvol);
1186 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1187 }
1188
1189 if ((act == ARCHIVE) || (act == APPND))
1190 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1191 else
1192 tty_prnt("\n");
1193
1194 for(;;) {
1195 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1196 argv0);
1197 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1198 tty_prnt(" cannot change storage media, type \"s\"\n");
1199 tty_prnt("Is the device ready and online? > ");
1200
1201 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1202 done = 1;
1203 lstrval = -1;
1204 tty_prnt("Quitting %s!\n", argv0);
1205 vfpart = 0;
1206 return(-1);
1207 }
1208
1209 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1210 tty_prnt("%s unknown command, try again\n",buf);
1211 continue;
1212 }
1213
1214 switch (buf[0]) {
1215 case 'y':
1216 case 'Y':
1217 /*
1218 * we are to continue with the same device
1219 */
1220 if (ar_open(arcname) >= 0)
1221 return(0);
1222 tty_prnt("Cannot re-open %s, try again\n",
1223 arcname);
1224 continue;
1225 case 's':
1226 case 'S':
1227 /*
1228 * user wants to open a different device
1229 */
1230 tty_prnt("Switching to a different archive\n");
1231 break;
1232 default:
1233 tty_prnt("%s unknown command, try again\n",buf);
1234 continue;
1235 }
1236 break;
1237 }
1238 } else
1239 tty_prnt("Ready for archive volume: %d\n", arvol);
1240
1241 /*
1242 * have to go to a different archive
1243 */
1244 for (;;) {
1245 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1246 tty_prnt("Archive name > ");
1247
1248 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1249 done = 1;
1250 lstrval = -1;
1251 tty_prnt("Quitting %s!\n", argv0);
1252 vfpart = 0;
1253 return(-1);
1254 }
1255 if (buf[0] == '\0') {
1256 tty_prnt("Empty file name, try again\n");
1257 continue;
1258 }
1259 if (!strcmp(buf, "..")) {
1260 tty_prnt("Illegal file name: .. try again\n");
1261 continue;
1262 }
1263 if (strlen(buf) > PAXPATHLEN) {
1264 tty_prnt("File name too long, try again\n");
1265 continue;
1266 }
1267
1268 /*
1269 * try to open new archive
1270 */
1271 if (ar_open(buf) >= 0) {
1272 if (freeit) {
1273 (void)free(arcname);
1274 freeit = 0;
1275 }
1276 if ((arcname = strdup(buf)) == NULL) {
1277 done = 1;
1278 lstrval = -1;
1279 pax_warn(0, "Cannot save archive name.");
1280 return(-1);
1281 }
1282 freeit = 1;
1283 break;
1284 }
1285 tty_prnt("Cannot open %s, try again\n", buf);
1286 continue;
1287 }
1288 return(0);
1289}
| 874 lstrval = -1;
875 return(-1);
876}
877
878/*
879 * ar_rev()
880 * move the i/o position within the archive backwards the specified byte
881 * count as supported by the device. With tapes drives we RESET rdblksz to
882 * the PHYSICAL blocksize.
883 * NOTE: We should only be called to move backwards so we can rewrite the
884 * last records (the trailer) of an archive (APPEND).
885 * Return:
886 * 0 if moved the requested distance, -1 on complete failure
887 */
888
889#if __STDC__
890int
891ar_rev(off_t sksz)
892#else
893int
894ar_rev(sksz)
895 off_t sksz;
896#endif
897{
898 off_t cpos;
899 struct mtop mb;
900 register int phyblk;
901
902 /*
903 * make sure we do not have try to reverse on a flawed archive
904 */
905 if (lstrval < 0)
906 return(lstrval);
907
908 switch(artyp) {
909 case ISPIPE:
910 if (sksz <= 0)
911 break;
912 /*
913 * cannot go backwards on these critters
914 */
915 pax_warn(1, "Reverse positioning on pipes is not supported.");
916 lstrval = -1;
917 return(-1);
918 case ISREG:
919 case ISBLK:
920 case ISCHR:
921 default:
922 if (sksz <= 0)
923 break;
924
925 /*
926 * For things other than files, backwards movement has a very
927 * high probability of failure as we really do not know the
928 * true attributes of the device we are talking to (the device
929 * may not even have the ability to lseek() in any direction).
930 * First we figure out where we are in the archive.
931 */
932 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
933 sys_warn(1, errno,
934 "Unable to obtain current archive byte offset");
935 lstrval = -1;
936 return(-1);
937 }
938
939 /*
940 * we may try to go backwards past the start when the archive
941 * is only a single record. If this hapens and we are on a
942 * multi volume archive, we need to go to the end of the
943 * previous volume and continue our movement backwards from
944 * there.
945 */
946 if ((cpos -= sksz) < (off_t)0L) {
947 if (arvol > 1) {
948 /*
949 * this should never happen
950 */
951 pax_warn(1,"Reverse position on previous volume.");
952 lstrval = -1;
953 return(-1);
954 }
955 cpos = (off_t)0L;
956 }
957 if (lseek(arfd, cpos, SEEK_SET) < 0) {
958 sys_warn(1, errno, "Unable to seek archive backwards");
959 lstrval = -1;
960 return(-1);
961 }
962 break;
963 case ISTAPE:
964 /*
965 * Calculate and move the proper number of PHYSICAL tape
966 * blocks. If the sksz is not an even multiple of the physical
967 * tape size, we cannot do the move (this should never happen).
968 * (We also cannot handler trailers spread over two vols).
969 * get_phys() also makes sure we are in front of the filemark.
970 */
971 if ((phyblk = get_phys()) <= 0) {
972 lstrval = -1;
973 return(-1);
974 }
975
976 /*
977 * make sure future tape reads only go by physical tape block
978 * size (set rdblksz to the real size).
979 */
980 rdblksz = phyblk;
981
982 /*
983 * if no movement is required, just return (we must be after
984 * get_phys() so the physical blocksize is properly set)
985 */
986 if (sksz <= 0)
987 break;
988
989 /*
990 * ok we have to move. Make sure the tape drive can do it.
991 */
992 if (sksz % phyblk) {
993 pax_warn(1,
994 "Tape drive unable to backspace requested amount");
995 lstrval = -1;
996 return(-1);
997 }
998
999 /*
1000 * move backwards the requested number of bytes
1001 */
1002 mb.mt_op = MTBSR;
1003 mb.mt_count = sksz/phyblk;
1004 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1005 sys_warn(1,errno, "Unable to backspace tape %d blocks.",
1006 mb.mt_count);
1007 lstrval = -1;
1008 return(-1);
1009 }
1010 break;
1011 }
1012 lstrval = 1;
1013 return(0);
1014}
1015
1016/*
1017 * get_phys()
1018 * Determine the physical block size on a tape drive. We need the physical
1019 * block size so we know how many bytes we skip over when we move with
1020 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
1021 * return.
1022 * This is one really SLOW routine...
1023 * Return:
1024 * physical block size if ok (ok > 0), -1 otherwise
1025 */
1026
1027#if __STDC__
1028static int
1029get_phys(void)
1030#else
1031static int
1032get_phys()
1033#endif
1034{
1035 register int padsz = 0;
1036 register int res;
1037 register int phyblk;
1038 struct mtop mb;
1039 char scbuf[MAXBLK];
1040
1041 /*
1042 * move to the file mark, and then back up one record and read it.
1043 * this should tell us the physical record size the tape is using.
1044 */
1045 if (lstrval == 1) {
1046 /*
1047 * we know we are at file mark when we get back a 0 from
1048 * read()
1049 */
1050 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1051 padsz += res;
1052 if (res < 0) {
1053 sys_warn(1, errno, "Unable to locate tape filemark.");
1054 return(-1);
1055 }
1056 }
1057
1058 /*
1059 * move backwards over the file mark so we are at the end of the
1060 * last record.
1061 */
1062 mb.mt_op = MTBSF;
1063 mb.mt_count = 1;
1064 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1065 sys_warn(1, errno, "Unable to backspace over tape filemark.");
1066 return(-1);
1067 }
1068
1069 /*
1070 * move backwards so we are in front of the last record and read it to
1071 * get physical tape blocksize.
1072 */
1073 mb.mt_op = MTBSR;
1074 mb.mt_count = 1;
1075 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1076 sys_warn(1, errno, "Unable to backspace over last tape block.");
1077 return(-1);
1078 }
1079 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1080 sys_warn(1, errno, "Cannot determine archive tape blocksize.");
1081 return(-1);
1082 }
1083
1084 /*
1085 * read foward to the file mark, then back up in front of the filemark
1086 * (this is a bit paranoid, but should be safe to do).
1087 */
1088 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1089 ;
1090 if (res < 0) {
1091 sys_warn(1, errno, "Unable to locate tape filemark.");
1092 return(-1);
1093 }
1094 mb.mt_op = MTBSF;
1095 mb.mt_count = 1;
1096 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1097 sys_warn(1, errno, "Unable to backspace over tape filemark.");
1098 return(-1);
1099 }
1100
1101 /*
1102 * set lstrval so we know that the filemark has not been seen
1103 */
1104 lstrval = 1;
1105
1106 /*
1107 * return if there was no padding
1108 */
1109 if (padsz == 0)
1110 return(phyblk);
1111
1112 /*
1113 * make sure we can move backwards over the padding. (this should
1114 * never fail).
1115 */
1116 if (padsz % phyblk) {
1117 pax_warn(1, "Tape drive unable to backspace requested amount");
1118 return(-1);
1119 }
1120
1121 /*
1122 * move backwards over the padding so the head is where it was when
1123 * we were first called (if required).
1124 */
1125 mb.mt_op = MTBSR;
1126 mb.mt_count = padsz/phyblk;
1127 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1128 sys_warn(1,errno,"Unable to backspace tape over %d pad blocks",
1129 mb.mt_count);
1130 return(-1);
1131 }
1132 return(phyblk);
1133}
1134
1135/*
1136 * ar_next()
1137 * prompts the user for the next volume in this archive. For some devices
1138 * we may allow the media to be changed. Otherwise a new archive is
1139 * prompted for. By pax spec, if there is no controlling tty or an eof is
1140 * read on tty input, we must quit pax.
1141 * Return:
1142 * 0 when ready to continue, -1 when all done
1143 */
1144
1145#if __STDC__
1146int
1147ar_next(void)
1148#else
1149int
1150ar_next()
1151#endif
1152{
1153 char buf[PAXPATHLEN+2];
1154 static int freeit = 0;
1155 sigset_t o_mask;
1156
1157 /*
1158 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1159 * things like writing EOF etc will be done) (Watch out ar_close() can
1160 * also be called via a signal handler, so we must prevent a race.
1161 */
1162 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1163 sys_warn(0, errno, "Unable to set signal mask");
1164 ar_close();
1165 if (sigprocmask(SIG_SETMASK, &o_mask, (sigset_t *)NULL) < 0)
1166 sys_warn(0, errno, "Unable to restore signal mask");
1167
1168 if (done || !wr_trail)
1169 return(-1);
1170
1171 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1172
1173 /*
1174 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1175 * the name), the user will be forced to type it in.
1176 */
1177 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1178 && (artyp != ISPIPE)) {
1179 if (artyp == ISTAPE) {
1180 tty_prnt("%s ready for archive tape volume: %d\n",
1181 arcname, arvol);
1182 tty_prnt("Load the NEXT TAPE on the tape drive");
1183 } else {
1184 tty_prnt("%s ready for archive volume: %d\n",
1185 arcname, arvol);
1186 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1187 }
1188
1189 if ((act == ARCHIVE) || (act == APPND))
1190 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1191 else
1192 tty_prnt("\n");
1193
1194 for(;;) {
1195 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1196 argv0);
1197 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1198 tty_prnt(" cannot change storage media, type \"s\"\n");
1199 tty_prnt("Is the device ready and online? > ");
1200
1201 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1202 done = 1;
1203 lstrval = -1;
1204 tty_prnt("Quitting %s!\n", argv0);
1205 vfpart = 0;
1206 return(-1);
1207 }
1208
1209 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1210 tty_prnt("%s unknown command, try again\n",buf);
1211 continue;
1212 }
1213
1214 switch (buf[0]) {
1215 case 'y':
1216 case 'Y':
1217 /*
1218 * we are to continue with the same device
1219 */
1220 if (ar_open(arcname) >= 0)
1221 return(0);
1222 tty_prnt("Cannot re-open %s, try again\n",
1223 arcname);
1224 continue;
1225 case 's':
1226 case 'S':
1227 /*
1228 * user wants to open a different device
1229 */
1230 tty_prnt("Switching to a different archive\n");
1231 break;
1232 default:
1233 tty_prnt("%s unknown command, try again\n",buf);
1234 continue;
1235 }
1236 break;
1237 }
1238 } else
1239 tty_prnt("Ready for archive volume: %d\n", arvol);
1240
1241 /*
1242 * have to go to a different archive
1243 */
1244 for (;;) {
1245 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1246 tty_prnt("Archive name > ");
1247
1248 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1249 done = 1;
1250 lstrval = -1;
1251 tty_prnt("Quitting %s!\n", argv0);
1252 vfpart = 0;
1253 return(-1);
1254 }
1255 if (buf[0] == '\0') {
1256 tty_prnt("Empty file name, try again\n");
1257 continue;
1258 }
1259 if (!strcmp(buf, "..")) {
1260 tty_prnt("Illegal file name: .. try again\n");
1261 continue;
1262 }
1263 if (strlen(buf) > PAXPATHLEN) {
1264 tty_prnt("File name too long, try again\n");
1265 continue;
1266 }
1267
1268 /*
1269 * try to open new archive
1270 */
1271 if (ar_open(buf) >= 0) {
1272 if (freeit) {
1273 (void)free(arcname);
1274 freeit = 0;
1275 }
1276 if ((arcname = strdup(buf)) == NULL) {
1277 done = 1;
1278 lstrval = -1;
1279 pax_warn(0, "Cannot save archive name.");
1280 return(-1);
1281 }
1282 freeit = 1;
1283 break;
1284 }
1285 tty_prnt("Cannot open %s, try again\n", buf);
1286 continue;
1287 }
1288 return(0);
1289}
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