2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
37 * @(#)ar_io.c 8.2 (Berkeley) 4/18/94
38 * $FreeBSD: src/bin/pax/ar_io.c,v 1.12.2.1 2001/08/01 05:03:11 obrien Exp $
39 * $DragonFly: src/bin/pax/ar_io.c,v 1.11 2006/09/27 23:58:08 pavalos Exp $
42 #include <sys/types.h>
43 #include <sys/ioctl.h>
60 * Routines which deal directly with the archive I/O device/file.
63 #define DMOD 0666 /* default mode of created archives */
64 #define EXT_MODE O_RDONLY /* open mode for list/extract */
65 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
66 #define APP_MODE O_RDWR /* mode for append */
67 #define STDO "<STDOUT>" /* pseudo name for stdout */
68 #define STDN "<STDIN>" /* pseudo name for stdin */
69 static int arfd
= -1; /* archive file descriptor */
70 static int artyp
= ISREG
; /* archive type: file/FIFO/tape */
71 static int arvol
= 1; /* archive volume number */
72 static int lstrval
= -1; /* return value from last i/o */
73 static int io_ok
; /* i/o worked on volume after resync */
74 static int did_io
; /* did i/o ever occur on volume? */
75 static int done
; /* set via tty termination */
76 static struct stat arsb
; /* stat of archive device at open */
77 static int invld_rec
; /* tape has out of spec record size */
78 static int wr_trail
= 1; /* trailer was rewritten in append */
79 static int can_unlnk
= 0; /* do we unlink null archives? */
80 char *arcname
; /* printable name of archive */
81 const char *gzip_program
; /* name of gzip program */
82 static pid_t zpid
= -1; /* pid of child process */
84 static int get_phys (void);
85 extern sigset_t s_mask
;
86 static void ar_start_gzip (int, const char *, int);
90 * Opens the next archive volume. Determines the type of the device and
91 * sets up block sizes as required by the archive device and the format.
92 * Note: we may be called with name == NULL on the first open only.
94 * -1 on failure, 0 otherwise
105 can_unlnk
= did_io
= io_ok
= invld_rec
= 0;
110 * open based on overall operation mode
118 } else if ((arfd
= open(name
, EXT_MODE
, DMOD
)) < 0)
119 syswarn(0, errno
, "Failed open to read on %s", name
);
120 if (arfd
!= -1 && gzip_program
!= NULL
)
121 ar_start_gzip(arfd
, gzip_program
, 0);
125 arfd
= STDOUT_FILENO
;
127 } else if ((arfd
= open(name
, AR_MODE
, DMOD
)) < 0)
128 syswarn(0, errno
, "Failed open to write on %s", name
);
131 if (arfd
!= -1 && gzip_program
!= NULL
)
132 ar_start_gzip(arfd
, gzip_program
, 1);
136 arfd
= STDOUT_FILENO
;
138 } else if ((arfd
= open(name
, APP_MODE
, DMOD
)) < 0)
139 syswarn(0, errno
, "Failed open to read/write on %s",
144 * arfd not used in COPY mode
153 if (chdname
!= NULL
) {
154 if (chdir(chdname
) != 0) {
155 syswarn(1, errno
, "Failed chdir to %s", chdname
);
160 * set up is based on device type
162 if (fstat(arfd
, &arsb
) < 0) {
163 syswarn(0, errno
, "Failed stat on %s", arcname
);
169 if (S_ISDIR(arsb
.st_mode
)) {
170 paxwarn(0, "Cannot write an archive on top of a directory %s",
178 if (S_ISCHR(arsb
.st_mode
))
179 artyp
= ioctl(arfd
, MTIOCGET
, &mb
) ? ISCHR
: ISTAPE
;
180 else if (S_ISBLK(arsb
.st_mode
))
182 else if ((lseek(arfd
, (off_t
)0L, SEEK_CUR
) == -1) && (errno
== ESPIPE
))
188 * make sure we beyond any doubt that we only can unlink regular files
194 * if we are writing, we are done
196 if (act
== ARCHIVE
) {
197 blksz
= rdblksz
= wrblksz
;
203 * set default blksz on read. APPNDs writes rdblksz on the last volume
204 * On all new archive volumes, we shift to wrblksz (if the user
205 * specified one, otherwise we will continue to use rdblksz). We
206 * must set blocksize based on what kind of device the archive is
212 * Tape drives come in at least two flavors. Those that support
213 * variable sized records and those that have fixed sized
214 * records. They must be treated differently. For tape drives
215 * that support variable sized records, we must make large
216 * reads to make sure we get the entire record, otherwise we
217 * will just get the first part of the record (up to size we
218 * asked). Tapes with fixed sized records may or may not return
219 * multiple records in a single read. We really do not care
220 * what the physical record size is UNLESS we are going to
221 * append. (We will need the physical block size to rewrite
222 * the trailer). Only when we are appending do we go to the
223 * effort to figure out the true PHYSICAL record size.
225 blksz
= rdblksz
= MAXBLK
;
231 * Blocksize is not a major issue with these devices (but must
232 * be kept a multiple of 512). If the user specified a write
233 * block size, we use that to read. Under append, we must
234 * always keep blksz == rdblksz. Otherwise we go ahead and use
235 * the device optimal blocksize as (and if) returned by stat
236 * and if it is within pax specs.
238 if ((act
== APPND
) && wrblksz
) {
239 blksz
= rdblksz
= wrblksz
;
243 if ((arsb
.st_blksize
> 0) && (arsb
.st_blksize
< MAXBLK
) &&
244 ((arsb
.st_blksize
% BLKMULT
) == 0))
245 rdblksz
= arsb
.st_blksize
;
249 * For performance go for large reads when we can without harm
251 if ((act
== APPND
) || (artyp
== ISCHR
))
258 * if the user specified wrblksz works, use it. Under appends
259 * we must always keep blksz == rdblksz
261 if ((act
== APPND
) && wrblksz
&& ((arsb
.st_size
%wrblksz
)==0)){
262 blksz
= rdblksz
= wrblksz
;
266 * See if we can find the blocking factor from the file size
268 for (rdblksz
= MAXBLK
; rdblksz
> 0; rdblksz
-= BLKMULT
)
269 if ((arsb
.st_size
% rdblksz
) == 0)
272 * When we cannot find a match, we may have a flawed archive.
277 * for performance go for large reads when we can
286 * should never happen, worst case, slow...
288 blksz
= rdblksz
= BLKMULT
;
297 * closes archive device, increments volume number, and prints i/o summary
305 did_io
= io_ok
= flcnt
= 0;
310 * Close archive file. This may take a LONG while on tapes (we may be
311 * forced to wait for the rewind to complete) so tell the user what is
312 * going on (this avoids the user hitting control-c thinking pax is
315 if (vflag
&& (artyp
== ISTAPE
)) {
319 "%s: Waiting for tape drive close to complete...",
325 * if nothing was written to the archive (and we created it), we remove
328 if (can_unlnk
&& (fstat(arfd
, &arsb
) == 0) && (S_ISREG(arsb
.st_mode
)) &&
329 (arsb
.st_size
== 0)) {
335 * for a quick extract/list, pax frequently exits before the child
338 if ((act
== LIST
|| act
== EXTRACT
) && nflag
&& zpid
> 0)
343 /* Do not exit before child to ensure data integrity */
345 waitpid(zpid
, &status
, 0);
347 if (vflag
&& (artyp
== ISTAPE
)) {
348 fputs("done.\n", listf
);
354 if (!io_ok
&& !did_io
) {
361 * The volume number is only increased when the last device has data
362 * and we have already determined the archive format.
373 * Print out a summary of I/O for this archive volume.
381 * If we have not determined the format yet, we just say how many bytes
382 * we have skipped over looking for a header to id. there is no way we
383 * could have written anything yet.
386 fprintf(listf
, "%s: unknown format, %qu bytes skipped.\n",
393 if (strcmp(NM_CPIO
, argv0
) == 0)
394 fprintf(listf
, "%qu blocks\n", (rdcnt
? rdcnt
: wrcnt
) / 5120);
395 else if (strcmp(NM_TAR
, argv0
) != 0)
397 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
398 argv0
, frmt
->name
, arvol
-1, flcnt
, rdcnt
, wrcnt
);
405 * drain any archive format independent padding from an archive read
406 * from a socket or a pipe. This is to prevent the process on the
407 * other side of the pipe from getting a SIGPIPE (pax will stop
408 * reading an archive once a format dependent trailer is detected).
417 * we only drain from a pipe/socket. Other devices can be closed
418 * without reading up to end of file. We sure hope that pipe is closed
419 * on the other side so we will get an EOF.
421 if ((artyp
!= ISPIPE
) || (lstrval
<= 0))
425 * keep reading until pipe is drained
427 while ((res
= read(arfd
, drbuf
, sizeof(drbuf
))) > 0)
434 * Set up device right before switching from read to write in an append.
435 * device dependent code (if required) to do this should be added here.
436 * For all archive devices we are already positioned at the place we want
437 * to start writing when this routine is called.
439 * 0 if all ready to write, -1 otherwise
448 * we must make sure the trailer is rewritten on append, ar_next()
449 * will stop us if the archive containing the trailer was not written
454 * Add any device dependent code as required here
459 * Ok we have an archive in a regular file. If we were rewriting a
460 * file, we must get rid of all the stuff after the current offset
461 * (it was not written by pax).
463 if (((cpos
= lseek(arfd
, (off_t
)0L, SEEK_CUR
)) < 0) ||
464 (ftruncate(arfd
, cpos
) < 0)) {
465 syswarn(1, errno
, "Unable to truncate archive file");
473 * check if the last volume in the archive allows appends. We cannot check
474 * this until we are ready to write since there is no spec that says all
475 * volumes in a single archive have to be of the same type...
477 * 0 if we can append, -1 otherwise.
483 if (artyp
== ISPIPE
) {
484 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
490 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
497 * read up to a specified number of bytes from the archive into the
498 * supplied buffer. When dealing with tapes we may not always be able to
501 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
505 ar_read(char *buf
, int cnt
)
510 * if last i/o was in error, no more reads until reset or new volume
516 * how we read must be based on device type
520 if ((res
= read(arfd
, buf
, cnt
)) > 0) {
522 * CAUTION: tape systems may not always return the same
523 * sized records so we leave blksz == MAXBLK. The
524 * physical record size that a tape drive supports is
525 * very hard to determine in a uniform and portable
529 if (res
!= rdblksz
) {
531 * Record size changed. If this happens on
532 * any record after the first, we probably have
533 * a tape drive which has a fixed record size
534 * (we are getting multiple records in a single
535 * read). Watch out for record blocking that
536 * violates pax spec (must be a multiple of
540 if (rdblksz
% BLKMULT
)
552 * Files are so easy to deal with. These other things cannot
553 * be trusted at all. So when we are dealing with character
554 * devices and pipes we just take what they have ready for us
555 * and return. Trying to do anything else with them runs the
558 if ((res
= read(arfd
, buf
, cnt
)) > 0) {
566 * We are in trouble at this point, something is broken...
570 syswarn(1, errno
, "Failed read on archive volume %d", arvol
);
572 paxwarn(0, "End of archive volume %d reached", arvol
);
578 * Write a specified number of bytes in supplied buffer to the archive
579 * device so it appears as a single "block". Deals with errors and tries
580 * to recover when faced with short writes.
582 * Number of bytes written. 0 indicates end of volume reached and with no
583 * flaws (as best that can be detected). A -1 indicates an unrecoverable
584 * error in the archive occurred.
588 ar_write(char *buf
, int bsz
)
594 * do not allow pax to create a "bad" archive. Once a write fails on
595 * an archive volume prevent further writes to it.
600 if ((res
= write(arfd
, buf
, bsz
)) == bsz
) {
606 * write broke, see what we can do with it. We try to send any partial
607 * writes that may violate pax spec to the next archive volume.
616 if ((res
> 0) && (res
% BLKMULT
)) {
618 * try to fix up partial writes which are not BLKMULT
619 * in size by forcing the runt record to next archive
622 if ((cpos
= lseek(arfd
, (off_t
)0L, SEEK_CUR
)) < 0)
625 if (ftruncate(arfd
, cpos
) < 0)
633 * if file is out of space, handle it like a return of 0
635 if ((errno
== ENOSPC
) || (errno
== EFBIG
) || (errno
== EDQUOT
))
643 if (errno
== EACCES
) {
644 paxwarn(0, "Write failed, archive is write protected.");
649 * see if we reached the end of media, if so force a change to
652 if ((errno
== ENOSPC
) || (errno
== EIO
) || (errno
== ENXIO
))
658 * we cannot fix errors to these devices
664 * Better tell the user the bad news...
665 * if this is a block aligned archive format, we may have a bad archive
666 * if the format wants the header to start at a BLKMULT boundary. While
667 * we can deal with the mis-aligned data, it violates spec and other
668 * archive readers will likely fail. if the format is not block
669 * aligned, the user may be lucky (and the archive is ok).
678 * If we were trying to rewrite the trailer and it didn't work, we
679 * must quit right away.
681 if (!wr_trail
&& (res
<= 0)) {
682 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
687 paxwarn(0, "End of archive volume %d reached", arvol
);
689 syswarn(1, errno
, "Failed write to archive volume: %d", arvol
);
690 else if (!frmt
->blkalgn
|| ((res
% frmt
->blkalgn
) == 0))
691 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
693 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
699 * Try to move past a bad spot on a flawed archive as needed to continue
700 * I/O. Clears error flags to allow I/O to continue.
702 * 0 when ok to try i/o again, -1 otherwise.
714 * Fail resync attempts at user request (done) or if this is going to be
715 * an update/append to a existing archive. if last i/o hit media end,
716 * we need to go to the next volume not try a resync
718 if ((done
> 0) || (lstrval
== 0))
721 if ((act
== APPND
) || (act
== ARCHIVE
)) {
722 paxwarn(1, "Cannot allow updates to an archive with flaws.");
731 * if the last i/o was a successful data transfer, we assume
732 * the fault is just a bad record on the tape that we are now
733 * past. If we did not get any data since the last resync try
734 * to move the tape forward one PHYSICAL record past any
735 * damaged tape section. Some tape drives are stubborn and need
745 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0)
753 * try to step over the bad part of the device.
756 if (((fsbz
= arsb
.st_blksize
) <= 0) || (artyp
!= ISREG
))
758 if ((cpos
= lseek(arfd
, (off_t
)0L, SEEK_CUR
)) < 0)
760 mpos
= fsbz
- (cpos
% (off_t
)fsbz
);
761 if (lseek(arfd
, mpos
, SEEK_CUR
) < 0)
768 * cannot recover on these archive device types
774 paxwarn(1, "Unable to recover from an archive read failure.");
777 paxwarn(0, "Attempting to recover from an archive read failure.");
783 * Move the I/O position within the archive forward the specified number of
784 * bytes as supported by the device. If we cannot move the requested
785 * number of bytes, return the actual number of bytes moved in skipped.
787 * 0 if moved the requested distance, -1 on complete failure, 1 on
788 * partial move (the amount moved is in skipped)
792 ar_fow(off_t sksz
, off_t
*skipped
)
802 * we cannot move forward at EOF or error
808 * Safer to read forward on devices where it is hard to find the end of
809 * the media without reading to it. With tapes we cannot be sure of the
810 * number of physical blocks to skip (we do not know physical block
811 * size at this point), so we must only read forward on tapes!
817 * figure out where we are in the archive
819 if ((cpos
= lseek(arfd
, (off_t
)0L, SEEK_CUR
)) >= 0) {
821 * we can be asked to move farther than there are bytes in this
822 * volume, if so, just go to file end and let normal buf_fill()
823 * deal with the end of file (it will go to next volume by
826 if ((mpos
= cpos
+ sksz
) > arsb
.st_size
) {
827 *skipped
= arsb
.st_size
- cpos
;
831 if (lseek(arfd
, mpos
, SEEK_SET
) >= 0)
834 syswarn(1, errno
, "Forward positioning operation on archive failed");
841 * move the i/o position within the archive backwards the specified byte
842 * count as supported by the device. With tapes drives we RESET rdblksz to
843 * the PHYSICAL blocksize.
844 * NOTE: We should only be called to move backwards so we can rewrite the
845 * last records (the trailer) of an archive (APPEND).
847 * 0 if moved the requested distance, -1 on complete failure
858 * make sure we do not have try to reverse on a flawed archive
868 * cannot go backwards on these critters
870 paxwarn(1, "Reverse positioning on pipes is not supported.");
881 * For things other than files, backwards movement has a very
882 * high probability of failure as we really do not know the
883 * true attributes of the device we are talking to (the device
884 * may not even have the ability to lseek() in any direction).
885 * First we figure out where we are in the archive.
887 if ((cpos
= lseek(arfd
, (off_t
)0L, SEEK_CUR
)) < 0) {
889 "Unable to obtain current archive byte offset");
895 * we may try to go backwards past the start when the archive
896 * is only a single record. If this happens and we are on a
897 * multi-volume archive, we need to go to the end of the
898 * previous volume and continue our movement backwards from
901 if ((cpos
-= sksz
) < (off_t
)0L) {
904 * this should never happen
906 paxwarn(1,"Reverse position on previous volume.");
912 if (lseek(arfd
, cpos
, SEEK_SET
) < 0) {
913 syswarn(1, errno
, "Unable to seek archive backwards");
920 * Calculate and move the proper number of PHYSICAL tape
921 * blocks. If the sksz is not an even multiple of the physical
922 * tape size, we cannot do the move (this should never happen).
923 * (We also cannot handle trailers spread over two vols.)
924 * get_phys() also makes sure we are in front of the filemark.
926 if ((phyblk
= get_phys()) <= 0) {
932 * make sure future tape reads only go by physical tape block
933 * size (set rdblksz to the real size).
938 * if no movement is required, just return (we must be after
939 * get_phys() so the physical blocksize is properly set)
945 * ok we have to move. Make sure the tape drive can do it.
949 "Tape drive unable to backspace requested amount");
955 * move backwards the requested number of bytes
958 mb
.mt_count
= sksz
/phyblk
;
959 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0) {
960 syswarn(1,errno
, "Unable to backspace tape %d blocks.",
973 * Determine the physical block size on a tape drive. We need the physical
974 * block size so we know how many bytes we skip over when we move with
975 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
977 * This is one really SLOW routine...
979 * physical block size if ok (ok > 0), -1 otherwise
992 * move to the file mark, and then back up one record and read it.
993 * this should tell us the physical record size the tape is using.
997 * we know we are at file mark when we get back a 0 from
1000 while ((res
= read(arfd
, scbuf
, sizeof(scbuf
))) > 0)
1003 syswarn(1, errno
, "Unable to locate tape filemark.");
1009 * move backwards over the file mark so we are at the end of the
1014 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0) {
1015 syswarn(1, errno
, "Unable to backspace over tape filemark.");
1020 * move backwards so we are in front of the last record and read it to
1021 * get physical tape blocksize.
1025 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0) {
1026 syswarn(1, errno
, "Unable to backspace over last tape block.");
1029 if ((phyblk
= read(arfd
, scbuf
, sizeof(scbuf
))) <= 0) {
1030 syswarn(1, errno
, "Cannot determine archive tape blocksize.");
1035 * read forward to the file mark, then back up in front of the filemark
1036 * (this is a bit paranoid, but should be safe to do).
1038 while ((res
= read(arfd
, scbuf
, sizeof(scbuf
))) > 0)
1041 syswarn(1, errno
, "Unable to locate tape filemark.");
1046 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0) {
1047 syswarn(1, errno
, "Unable to backspace over tape filemark.");
1052 * set lstrval so we know that the filemark has not been seen
1057 * return if there was no padding
1063 * make sure we can move backwards over the padding. (this should
1066 if (padsz
% phyblk
) {
1067 paxwarn(1, "Tape drive unable to backspace requested amount");
1072 * move backwards over the padding so the head is where it was when
1073 * we were first called (if required).
1076 mb
.mt_count
= padsz
/phyblk
;
1077 if (ioctl(arfd
, MTIOCTOP
, &mb
) < 0) {
1078 syswarn(1,errno
,"Unable to backspace tape over %d pad blocks",
1087 * prompts the user for the next volume in this archive. For some devices
1088 * we may allow the media to be changed. Otherwise a new archive is
1089 * prompted for. By pax spec, if there is no controlling tty or an eof is
1090 * read on tty input, we must quit pax.
1092 * 0 when ready to continue, -1 when all done
1098 char buf
[PAXPATHLEN
+2];
1099 static int freeit
= 0;
1103 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1104 * things like writing EOF etc will be done) (Watch out ar_close() can
1105 * also be called via a signal handler, so we must prevent a race.
1107 if (sigprocmask(SIG_BLOCK
, &s_mask
, &o_mask
) < 0)
1108 syswarn(0, errno
, "Unable to set signal mask");
1110 if (sigprocmask(SIG_SETMASK
, &o_mask
, NULL
) < 0)
1111 syswarn(0, errno
, "Unable to restore signal mask");
1113 if (done
|| !wr_trail
|| strcmp(NM_TAR
, argv0
) == 0)
1116 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0
);
1119 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1120 * the name), the user will be forced to type it in.
1122 if (strcmp(arcname
, STDO
) && strcmp(arcname
, STDN
) && (artyp
!= ISREG
)
1123 && (artyp
!= ISPIPE
)) {
1124 if (artyp
== ISTAPE
) {
1125 tty_prnt("%s ready for archive tape volume: %d\n",
1127 tty_prnt("Load the NEXT TAPE on the tape drive");
1129 tty_prnt("%s ready for archive volume: %d\n",
1131 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1134 if ((act
== ARCHIVE
) || (act
== APPND
))
1135 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1140 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1142 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1143 tty_prnt(" cannot change storage media, type \"s\"\n");
1144 tty_prnt("Is the device ready and online? > ");
1146 if ((tty_read(buf
,sizeof(buf
))<0) || !strcmp(buf
,".")){
1149 tty_prnt("Quitting %s!\n", argv0
);
1154 if ((buf
[0] == '\0') || (buf
[1] != '\0')) {
1155 tty_prnt("%s unknown command, try again\n",buf
);
1163 * we are to continue with the same device
1165 if (ar_open(arcname
) >= 0)
1167 tty_prnt("Cannot re-open %s, try again\n",
1173 * user wants to open a different device
1175 tty_prnt("Switching to a different archive\n");
1178 tty_prnt("%s unknown command, try again\n",buf
);
1184 tty_prnt("Ready for archive volume: %d\n", arvol
);
1187 * have to go to a different archive
1190 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0
);
1191 tty_prnt("Archive name > ");
1193 if ((tty_read(buf
, sizeof(buf
)) < 0) || !strcmp(buf
, ".")) {
1196 tty_prnt("Quitting %s!\n", argv0
);
1200 if (buf
[0] == '\0') {
1201 tty_prnt("Empty file name, try again\n");
1204 if (!strcmp(buf
, "..")) {
1205 tty_prnt("Illegal file name: .. try again\n");
1208 if (strlen(buf
) > PAXPATHLEN
) {
1209 tty_prnt("File name too long, try again\n");
1214 * try to open new archive
1216 if (ar_open(buf
) >= 0) {
1221 if ((arcname
= strdup(buf
)) == NULL
) {
1224 paxwarn(0, "Cannot save archive name.");
1230 tty_prnt("Cannot open %s, try again\n", buf
);
1238 * starts the gzip compression/decompression process as a child, using magic
1239 * to keep the fd the same in the calling function (parent).
1242 ar_start_gzip(int fd
, const char *gzip_program
, int wr
)
1248 err(1, "could not pipe");
1251 err(1, "could not fork");
1263 dup2(fds
[0], STDIN_FILENO
);
1264 dup2(fd
, STDOUT_FILENO
);
1267 dup2(fds
[1], STDOUT_FILENO
);
1268 dup2(fd
, STDIN_FILENO
);
1273 if (execlp(gzip_program
, gzip_program
, gzip_flags
,
1275 err(1, "could not exec");