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 1.9 2004/11/07 20:54:51 eirikn 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, otherwize we will continue to use rdblksz). We
206 * must to 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, worse 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.
387 fprintf(listf, "%s: unknown format, %lu bytes skipped.\n",
389 fprintf(listf, "%s: unknown format, %qu bytes skipped.\n",
397 if (strcmp(NM_CPIO, argv0) == 0)
398 fprintf(listf, "%qu blocks\n", (rdcnt ? rdcnt : wrcnt) / 5120);
399 else if (strcmp(NM_TAR, argv0) != 0)
402 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
404 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
406 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
413 * drain any archive format independent padding from an archive read
414 * from a socket or a pipe. This is to prevent the process on the
415 * other side of the pipe from getting a SIGPIPE (pax will stop
416 * reading an archive once a format dependent trailer is detected).
425 * we only drain from a pipe/socket. Other devices can be closed
426 * without reading up to end of file. We sure hope that pipe is closed
427 * on the other side so we will get an EOF.
429 if ((artyp != ISPIPE) || (lstrval <= 0))
433 * keep reading until pipe is drained
435 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
442 * Set up device right before switching from read to write in an append.
443 * device dependent code (if required) to do this should be added here.
444 * For all archive devices we are already positioned at the place we want
445 * to start writing when this routine is called.
447 * 0 if all ready to write, -1 otherwise
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
462 * Add any device dependent code as required here
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).
471 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
472 (ftruncate(arfd, cpos) < 0)) {
473 syswarn(1, errno, "Unable to truncate archive file");
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...
485 * 0 if we can append, -1 otherwise.
491 if (artyp == ISPIPE) {
492 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
498 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
505 * read up to a specified number of bytes from the archive into the
506 * supplied buffer. When dealing with tapes we may not always be able to
509 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
513 ar_read(char *buf, int cnt)
518 * if last i/o was in error, no more reads until reset or new volume
524 * how we read must be based on device type
528 if ((res = read(arfd, buf, cnt)) > 0) {
530 * CAUTION: tape systems may not always return the same
531 * sized records so we leave blksz == MAXBLK. The
532 * physical record size that a tape drive supports is
533 * very hard to determine in a uniform and portable
537 if (res != rdblksz) {
539 * Record size changed. If this is happens on
540 * any record after the first, we probably have
541 * a tape drive which has a fixed record size
542 * we are getting multiple records in a single
543 * read). Watch out for record blocking that
544 * violates pax spec (must be a multiple of
548 if (rdblksz % BLKMULT)
560 * Files are so easy to deal with. These other things cannot
561 * be trusted at all. So when we are dealing with character
562 * devices and pipes we just take what they have ready for us
563 * and return. Trying to do anything else with them runs the
566 if ((res = read(arfd, buf, cnt)) > 0) {
574 * We are in trouble at this point, something is broken...
578 syswarn(1, errno, "Failed read on archive volume %d", arvol);
580 paxwarn(0, "End of archive volume %d reached", arvol);
586 * Write a specified number of bytes in supplied buffer to the archive
587 * device so it appears as a single "block". Deals with errors and tries
588 * to recover when faced with short writes.
590 * Number of bytes written. 0 indicates end of volume reached and with no
591 * flaws (as best that can be detected). A -1 indicates an unrecoverable
592 * error in the archive occured.
596 ar_write(char *buf, int bsz)
602 * do not allow pax to create a "bad" archive. Once a write fails on
603 * an archive volume prevent further writes to it.
608 if ((res = write(arfd, buf, bsz)) == bsz) {
614 * write broke, see what we can do with it. We try to send any partial
615 * writes that may violate pax spec to the next archive volume.
624 if ((res > 0) && (res % BLKMULT)) {
626 * try to fix up partial writes which are not BLKMULT
627 * in size by forcing the runt record to next archive
630 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
633 if (ftruncate(arfd, cpos) < 0)
641 * if file is out of space, handle it like a return of 0
643 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
651 if (errno == EACCES) {
652 paxwarn(0, "Write failed, archive is write protected.");
657 * see if we reached the end of media, if so force a change to
660 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
666 * we cannot fix errors to these devices
672 * Better tell the user the bad news...
673 * if this is a block aligned archive format, we may have a bad archive
674 * if the format wants the header to start at a BLKMULT boundary. While
675 * we can deal with the mis-aligned data, it violates spec and other
676 * archive readers will likely fail. if the format is not block
677 * aligned, the user may be lucky (and the archive is ok).
686 * If we were trying to rewrite the trailer and it didn't work, we
687 * must quit right away.
689 if (!wr_trail && (res <= 0)) {
690 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
695 paxwarn(0, "End of archive volume %d reached", arvol);
697 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
698 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
699 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
701 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
707 * Try to move past a bad spot on a flawed archive as needed to continue
708 * I/O. Clears error flags to allow I/O to continue.
710 * 0 when ok to try i/o again, -1 otherwise.
722 * Fail resync attempts at user request (done) or this is going to be
723 * an update/append to a existing archive. if last i/o hit media end,
724 * we need to go to the next volume not try a resync
726 if ((done > 0) || (lstrval == 0))
729 if ((act == APPND) || (act == ARCHIVE)) {
730 paxwarn(1, "Cannot allow updates to an archive with flaws.");
739 * if the last i/o was a successful data transfer, we assume
740 * the fault is just a bad record on the tape that we are now
741 * past. If we did not get any data since the last resync try
742 * to move the tape forward one PHYSICAL record past any
743 * damaged tape section. Some tape drives are stubborn and need
753 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
761 * try to step over the bad part of the device.
764 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
766 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
768 mpos = fsbz - (cpos % (off_t)fsbz);
769 if (lseek(arfd, mpos, SEEK_CUR) < 0)
776 * cannot recover on these archive device types
782 paxwarn(1, "Unable to recover from an archive read failure.");
785 paxwarn(0, "Attempting to recover from an archive read failure.");
791 * Move the I/O position within the archive foward the specified number of
792 * bytes as supported by the device. If we cannot move the requested
793 * number of bytes, return the actual number of bytes moved in skipped.
795 * 0 if moved the requested distance, -1 on complete failure, 1 on
796 * partial move (the amount moved is in skipped)
800 ar_fow(off_t sksz, off_t *skipped)
810 * we cannot move foward at EOF or error
816 * Safer to read forward on devices where it is hard to find the end of
817 * the media without reading to it. With tapes we cannot be sure of the
818 * number of physical blocks to skip (we do not know physical block
819 * size at this point), so we must only read foward on tapes!
825 * figure out where we are in the archive
827 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
829 * we can be asked to move farther than there are bytes in this
830 * volume, if so, just go to file end and let normal buf_fill()
831 * deal with the end of file (it will go to next volume by
834 if ((mpos = cpos + sksz) > arsb.st_size) {
835 *skipped = arsb.st_size - cpos;
839 if (lseek(arfd, mpos, SEEK_SET) >= 0)
842 syswarn(1, errno, "Forward positioning operation on archive failed");
849 * move the i/o position within the archive backwards the specified byte
850 * count as supported by the device. With tapes drives we RESET rdblksz to
851 * the PHYSICAL blocksize.
852 * NOTE: We should only be called to move backwards so we can rewrite the
853 * last records (the trailer) of an archive (APPEND).
855 * 0 if moved the requested distance, -1 on complete failure
866 * make sure we do not have try to reverse on a flawed archive
876 * cannot go backwards on these critters
878 paxwarn(1, "Reverse positioning on pipes is not supported.");
889 * For things other than files, backwards movement has a very
890 * high probability of failure as we really do not know the
891 * true attributes of the device we are talking to (the device
892 * may not even have the ability to lseek() in any direction).
893 * First we figure out where we are in the archive.
895 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
897 "Unable to obtain current archive byte offset");
903 * we may try to go backwards past the start when the archive
904 * is only a single record. If this hapens and we are on a
905 * multi volume archive, we need to go to the end of the
906 * previous volume and continue our movement backwards from
909 if ((cpos -= sksz) < (off_t)0L) {
912 * this should never happen
914 paxwarn(1,"Reverse position on previous volume.");
920 if (lseek(arfd, cpos, SEEK_SET) < 0) {
921 syswarn(1, errno, "Unable to seek archive backwards");
928 * Calculate and move the proper number of PHYSICAL tape
929 * blocks. If the sksz is not an even multiple of the physical
930 * tape size, we cannot do the move (this should never happen).
931 * (We also cannot handler trailers spread over two vols).
932 * get_phys() also makes sure we are in front of the filemark.
934 if ((phyblk = get_phys()) <= 0) {
940 * make sure future tape reads only go by physical tape block
941 * size (set rdblksz to the real size).
946 * if no movement is required, just return (we must be after
947 * get_phys() so the physical blocksize is properly set)
953 * ok we have to move. Make sure the tape drive can do it.
957 "Tape drive unable to backspace requested amount");
963 * move backwards the requested number of bytes
966 mb.mt_count = sksz/phyblk;
967 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
968 syswarn(1,errno, "Unable to backspace tape %d blocks.",
981 * Determine the physical block size on a tape drive. We need the physical
982 * block size so we know how many bytes we skip over when we move with
983 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
985 * This is one really SLOW routine...
987 * physical block size if ok (ok > 0), -1 otherwise
1000 * move to the file mark, and then back up one record and read it.
1001 * this should tell us the physical record size the tape is using.
1005 * we know we are at file mark when we get back a 0 from
1008 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1011 syswarn(1, errno, "Unable to locate tape filemark.");
1017 * move backwards over the file mark so we are at the end of the
1022 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1023 syswarn(1, errno, "Unable to backspace over tape filemark.");
1028 * move backwards so we are in front of the last record and read it to
1029 * get physical tape blocksize.
1033 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1034 syswarn(1, errno, "Unable to backspace over last tape block.");
1037 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1038 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1043 * read foward to the file mark, then back up in front of the filemark
1044 * (this is a bit paranoid, but should be safe to do).
1046 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1049 syswarn(1, errno, "Unable to locate tape filemark.");
1054 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1055 syswarn(1, errno, "Unable to backspace over tape filemark.");
1060 * set lstrval so we know that the filemark has not been seen
1065 * return if there was no padding
1071 * make sure we can move backwards over the padding. (this should
1074 if (padsz % phyblk) {
1075 paxwarn(1, "Tape drive unable to backspace requested amount");
1080 * move backwards over the padding so the head is where it was when
1081 * we were first called (if required).
1084 mb.mt_count = padsz/phyblk;
1085 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1086 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1095 * prompts the user for the next volume in this archive. For some devices
1096 * we may allow the media to be changed. Otherwise a new archive is
1097 * prompted for. By pax spec, if there is no controlling tty or an eof is
1098 * read on tty input, we must quit pax.
1100 * 0 when ready to continue, -1 when all done
1106 char buf[PAXPATHLEN+2];
1107 static int freeit = 0;
1111 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1112 * things like writing EOF etc will be done) (Watch out ar_close() can
1113 * also be called via a signal handler, so we must prevent a race.
1115 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1116 syswarn(0, errno, "Unable to set signal mask");
1118 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1119 syswarn(0, errno, "Unable to restore signal mask");
1121 if (done || !wr_trail || strcmp(NM_TAR, argv0) == 0)
1124 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1127 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1128 * the name), the user will be forced to type it in.
1130 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1131 && (artyp != ISPIPE)) {
1132 if (artyp == ISTAPE) {
1133 tty_prnt("%s ready for archive tape volume: %d\n",
1135 tty_prnt("Load the NEXT TAPE on the tape drive");
1137 tty_prnt("%s ready for archive volume: %d\n",
1139 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1142 if ((act == ARCHIVE) || (act == APPND))
1143 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1148 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1150 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1151 tty_prnt(" cannot change storage media, type \"s\"\n");
1152 tty_prnt("Is the device ready and online? > ");
1154 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1157 tty_prnt("Quitting %s!\n", argv0);
1162 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1163 tty_prnt("%s unknown command, try again\n",buf);
1171 * we are to continue with the same device
1173 if (ar_open(arcname) >= 0)
1175 tty_prnt("Cannot re-open %s, try again\n",
1181 * user wants to open a different device
1183 tty_prnt("Switching to a different archive\n");
1186 tty_prnt("%s unknown command, try again\n",buf);
1192 tty_prnt("Ready for archive volume: %d\n", arvol);
1195 * have to go to a different archive
1198 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1199 tty_prnt("Archive name > ");
1201 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1204 tty_prnt("Quitting %s!\n", argv0);
1208 if (buf[0] == '\0') {
1209 tty_prnt("Empty file name, try again\n");
1212 if (!strcmp(buf, "..")) {
1213 tty_prnt("Illegal file name: .. try again\n");
1216 if (strlen(buf) > PAXPATHLEN) {
1217 tty_prnt("File name too long, try again\n");
1222 * try to open new archive
1224 if (ar_open(buf) >= 0) {
1229 if ((arcname = strdup(buf)) == NULL) {
1232 paxwarn(0, "Cannot save archive name.");
1238 tty_prnt("Cannot open %s, try again\n", buf);
1246 * starts the gzip compression/decompression process as a child, using magic
1247 * to keep the fd the same in the calling function (parent).
1250 ar_start_gzip(int fd, const char *gzip_program, int wr)
1256 err(1, "could not pipe");
1259 err(1, "could not fork");
1271 dup2(fds[0], STDIN_FILENO);
1272 dup2(fd, STDOUT_FILENO);
1275 dup2(fds[1], STDOUT_FILENO);
1276 dup2(fd, STDIN_FILENO);
1281 if (execlp(gzip_program, gzip_program, gzip_flags,
1283 err(1, "could not exec");